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#1 2025-08-07 05:04:20
- rossboulet
- Member
- Registered: 2015-01-23
- Posts: 35
[SOLVED] glibc 2.42 breaks file command in a tty
I haven't completely narrowed down the issue, but I stumbled across an issue using the file commend. The issue take two forms. In some cases, file coredumps every time. In others, it coredumps if I try to redirect stdout to /dev/null
It happened first on a qemu VM, then on a VirtualBox VM with a Windows 11 host, but I was able to reproduce it on a physical machine as well. file had not been updated, but I looked at its dependencies and noticed glibc had been upgraded from 2.41 to 2,42. So if I go back to glibc 2.41, the issue goes away. with glibc 2.42 the problem returns.
On the qemu VM:
cartman2% file eee
eee: ASCII text
cartman2% file eee >/dev/null <<<---problem
zsh: invalid system call (core dumped) file eee > /dev/null
cartman2% sudo pacman -U glibc-2.41+r65+ge7c419a29575-1-x86_64.pkg.tar.zst
loading packages...
warning: downgrading package glibc (2.42+r3+gbc13db739377-1 => 2.41+r65+ge7c419a29575-1)
cartman2% file eee >/dev/null <<<---no problem
cartman2%
cartman2% sudo pacman -Su
Packages (1) glibc-2.42+r3+gbc13db739377-1
Total Installed Size: 49.70 MiB
Net Upgrade Size: 1.53 MiB
cartman2% file eee
eee: ASCII text
cartman2% file eee >/dev/null <<<---problem returns
zsh: invalid system call (core dumped) file eee > /dev/null
cartman2%On a VirtualBox VM and on a physical machine with glibc 2.42 (and no redirection):
ike# file eee
Bad system call (core dumped) file eeeLast edited by rossboulet (2025-08-10 08:11:14)
I really hate this damn machine,
I wish that they would sell it.
It never does just what I want,
But only what I tell it. -Anonymous
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#2 2025-08-07 07:33:30
- seth
- Member
- From: Don't DM me only for attention
- Registered: 2012-09-03
- Posts: 73,706
Re: [SOLVED] glibc 2.42 breaks file command in a tty
There've been quite some termios patches in the latest glibc release, looks like a complete refactor…
https://wiki.archlinux.org/title/Core_d … _core_dump but afaiu the coredump is triggered by the redirection - is only file affected? And only /dev/null?
The troublesome system call will be
ioctl(1, TCGETS, 0x123456789abcdef) = -1 ENOTTYbut that would affect eg. du as well?
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#3 2025-08-07 18:00:40
- rossboulet
- Member
- Registered: 2015-01-23
- Posts: 35
Re: [SOLVED] glibc 2.42 breaks file command in a tty
seth wrote:
There've been quite some termios patches in the latest glibc release, looks like a complete refactor…
https://wiki.archlinux.org/title/Core_d … _core_dump but afaiu the coredump is triggered by the redirection - is only file affected? And only /dev/null?
The troublesome system call will beioctl(1, TCGETS, 0x123456789abcdef) = -1 ENOTTYbut that would affect eg. du as well?
du had no issues. Your question prompted some further research. In attempting to create more documentation of the problem, I ssh'ed into the physical machine but the problem didn't happen in the ssh session. I'm revising the title to specify the problem seems to be reproduceable in a tty even with no redirection.
##### with glibc 2.42 in a tty - coredump
cartman2% pacman -Q glibc
glibc 2.42+r3+gbc13db739377-1
cartman2% file 000
zsh: invalid system call (core dumped) file 000
### works if I pipe it to cat
cartman2% file 000 | cat
000: empty
cartman2%##### with glibc 2.41 in a tty - works as expected
cartman2% pacman -Q glibc
glibc 2.41+r65+ge7c419a29575-1
cartman2% file 000
000: ASCII text
000: empty
cartman2%I really hate this damn machine,
I wish that they would sell it.
It never does just what I want,
But only what I tell it. -Anonymous
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#4 2025-08-07 18:56:52
- seth
- Member
- From: Don't DM me only for attention
- Registered: 2012-09-03
- Posts: 73,706
Re: [SOLVED] glibc 2.42 breaks file command in a tty
Do you have a strace and a backtrace (from gdb, see link in previous post) on this?
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#5 2025-08-07 19:28:18
- rossboulet
- Member
- Registered: 2015-01-23
- Posts: 35
Re: [SOLVED] glibc 2.42 breaks file command in a tty
strace file abc
execve("/usr/bin/file", ["file", "abc"], 0x7ffd986aca98 /* 20 vars */) = 0
brk(NULL) = 0x55f06ef10000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=24579, ...}) = 0
mmap(NULL, 24579, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0645686000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libmagic.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=174328, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0645684000
mmap(NULL, 173160, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0645659000
mmap(0x7f064565c000, 122880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f064565c000
mmap(0x7f064567a000, 28672, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x21000) = 0x7f064567a000
mmap(0x7f0645681000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7f0645681000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libseccomp.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=133136, ...}) = 0
mmap(NULL, 131168, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0645638000
mmap(0x7f064563a000, 61440, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f064563a000
mmap(0x7f0645649000, 57344, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f0645649000
mmap(0x7f0645657000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f000) = 0x7f0645657000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000x\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
fstat(3, {st_mode=S_IFREG|0755, st_size=2149728, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
mmap(NULL, 2174000, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0645400000
mmap(0x7f0645424000, 1515520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7f0645424000
mmap(0x7f0645596000, 454656, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x196000) = 0x7f0645596000
mmap(0x7f0645605000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x204000) = 0x7f0645605000
mmap(0x7f064560b000, 31792, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f064560b000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libzstd.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=935880, ...}) = 0
mmap(NULL, 933944, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f064531b000
mmap(0x7f0645327000, 811008, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f0645327000
mmap(0x7f06453ed000, 69632, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd2000) = 0x7f06453ed000
mmap(0x7f06453fe000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe3000) = 0x7f06453fe000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=211152, ...}) = 0
mmap(NULL, 209112, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f06452e7000
mmap(0x7f06452eb000, 143360, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f06452eb000
mmap(0x7f064530e000, 45056, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x27000) = 0x7f064530e000
mmap(0x7f0645319000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x32000) = 0x7f0645319000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libbz2.so.1.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=74720, ...}) = 0
mmap(NULL, 76840, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0645625000
mmap(0x7f0645627000, 53248, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f0645627000
mmap(0x7f0645634000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f0645634000
mmap(0x7f0645636000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7f0645636000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=100368, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0645623000
mmap(NULL, 98320, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f06452ce000
mmap(0x7f06452d1000, 57344, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f06452d1000
mmap(0x7f06452df000, 24576, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f06452df000
mmap(0x7f06452e5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f06452e5000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0645620000
arch_prctl(ARCH_SET_FS, 0x7f0645620740) = 0
set_tid_address(0x7f0645620a10) = 819
set_robust_list(0x7f0645620a20, 24) = 0
rseq(0x7f0645620680, 0x20, 0, 0x53053053) = 0
mprotect(0x7f0645605000, 16384, PROT_READ) = 0
mprotect(0x7f06452e5000, 4096, PROT_READ) = 0
mprotect(0x7f0645636000, 4096, PROT_READ) = 0
mprotect(0x7f0645319000, 4096, PROT_READ) = 0
mprotect(0x7f06453fe000, 4096, PROT_READ) = 0
mprotect(0x7f0645657000, 4096, PROT_READ) = 0
mprotect(0x7f0645681000, 8192, PROT_READ) = 0
mprotect(0x55f04c398000, 4096, PROT_READ) = 0
mprotect(0x7f06456ce000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
getrandom("\x8b\x0a\xb4\xef\x0a\xed\x06\x8c", 8, GRND_NONBLOCK) = 8
munmap(0x7f0645686000, 24579) = 0
brk(NULL) = 0x55f06ef10000
brk(0x55f06ef31000) = 0x55f06ef31000
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2998, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2998
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/lib/locale/C.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/C.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=367708, ...}) = 0
mmap(NULL, 367708, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0645274000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.cache", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=3916, ...}) = 0
read(3, "# GNU libc iconv configuration.\n"..., 4096) = 3916
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.d", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
getdents64(3, 0x55f06ef14130 /* 3 entries */, 32768) = 96
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.d/gconv-modules-extra.conf", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=53974, ...}) = 0
read(4, "# GNU libc iconv configuration.\n"..., 4096) = 4096
read(4, "B1002//\tJUS_I.B1.002//\nmodule\tJU"..., 4096) = 4096
read(4, "59-5//\nalias\tISO_8859-5//\t\tISO-8"..., 4096) = 4096
read(4, "59-16//\t\tINTERNAL\t\tISO8859-16\t1\n"..., 4096) = 4096
read(4, "-SE-A\t1\nmodule\tINTERNAL\t\tEBCDIC-"..., 4096) = 4096
read(4, "97\t\t1\n\n#\tfrom\t\t\tto\t\t\tmodule\t\tcos"..., 4096) = 4096
read(4, "1\n\n#\tfrom\t\t\tto\t\t\tmodule\t\tcost\nal"..., 4096) = 4096
read(4, "6//\t\tIBM1046//\nalias\tCP1046//\t\tI"..., 4096) = 4096
read(4, "\tto\t\t\tmodule\t\tcost\nalias\tRUSCII/"..., 4096) = 4096
brk(0x55f06ef52000) = 0x55f06ef52000
read(4, "03//\nmodule\tCSN_369103//\t\tINTERN"..., 4096) = 4096
read(4, "\tmodule\t\tcost\nalias\tISO-IR-8-1//"..., 4096) = 4096
read(4, "IBM1156\t\t1\n\n#\tfrom\t\t\tto\t\t\tmodule"..., 4096) = 4096
read(4, "\t\tIBM1166//\nalias\tCP1166//\t\tIBM1"..., 4096) = 4096
read(4, "alias\tROMAN9//\t\tHP-ROMAN9//\nalia"..., 4096) = 726
read(4, "", 4096) = 0
close(4) = 0
getdents64(3, 0x55f06ef14130 /* 0 entries */, 32768) = 0
close(3) = 0
futex(0x7f064560a72c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
seccomp(SECCOMP_SET_MODE_STRICT, 0x1, NULL) = -1 EINVAL (Invalid argument)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_GET_ACTION_AVAIL, 0, [SECCOMP_RET_LOG]) = 0
seccomp(SECCOMP_GET_ACTION_AVAIL, 0, [SECCOMP_RET_KILL_PROCESS]) = 0
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_SPEC_ALLOW, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_NEW_LISTENER, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_GET_NOTIF_SIZES, 0, {seccomp_notif=80, seccomp_notif_resp=24, seccomp_data=64}) = 0
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC_ESRCH, NULL) = -1 EFAULT (Bad address)
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
seccomp(SECCOMP_SET_MODE_FILTER, 0, {len=63, filter=0x55f06ef41190}) = 0
newfstatat(AT_FDCWD, "/root/.magic.mgc", 0x7ffd5376b800, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/root/.magic", 0x7ffd5376b800, 0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/file/misc/magic.mgc", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=10357200, ...}) = 0
mmap(NULL, 10357200, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0x7f0644800000
close(3) = 0
mprotect(0x7f0644800000, 10357200, PROT_READ) = 0
mmap(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0645253000
fstat(1, {st_mode=S_IFIFO|0600, st_size=0, ...}) = 0
mmap(NULL, 7344128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f06440ff000
newfstatat(AT_FDCWD, "abc", {st_mode=S_IFREG|0644, st_size=0, ...}, AT_SYMLINK_NOFOLLOW) = 0
munmap(0x7f06440ff000, 7344128) = 0
write(1, "abc: empty\n", 11abc: empty
) = 11
munmap(0x7f0644800000, 10357200) = 0
munmap(0x7f0645253000, 135168) = 0
exit_group(0) = ?
+++ exited with 0 +++coredumpctl info 794
PID: 794 (file)
UID: 0 (root)
GID: 0 (root)
Signal: 31 (SYS)
Timestamp: Thu 2025-08-07 19:12:07 UTC (4min 48s ago)
Command Line: file abc
Executable: /usr/bin/file
Control Group: /user.slice/user-0.slice/session-1.scope
Unit: session-1.scope
Slice: user-0.slice
Session: 1
Owner UID: 0 (root)
Boot ID: 47075ab78af64e0ea62bc377828e0315
Machine ID: 46de833e1c444be99d3082b4e42cf52a
Hostname: archlinux
Storage: /var/lib/systemd/coredump/core.file.0.47075ab78af64e0ea62bc377828e0315.794.1754593927000000.zst (present)
Size on Disk: 79.9K
Message: Process 794 (file) of user 0 dumped core.
Stack trace of thread 794:
#0 0x00007f362290eb49 n/a (libc.so.6 + 0x10eb49)
#1 0x00007f362288003a _IO_file_doallocate (libc.so.6 + 0x8003a)
#2 0x00007f3622890226 _IO_doallocbuf (libc.so.6 + 0x90226)
#3 0x00007f362288e099 _IO_file_overflow (libc.so.6 + 0x8e099)
#4 0x00007f362288ecbb _IO_file_xsputn (libc.so.6 + 0x8ecbb)
#5 0x00007f362285b426 n/a (libc.so.6 + 0x5b426)
#6 0x00007f362285b50c n/a (libc.so.6 + 0x5b50c)
#7 0x00007f3622866e35 n/a (libc.so.6 + 0x66e35)
#8 0x00007f36229271fd __printf_chk (libc.so.6 + 0x1271fd)
#9 0x000055d26775dbd0 n/a (/usr/bin/file + 0x3bd0)
#10 0x000055d26775d075 n/a (/usr/bin/file + 0x3075)
#11 0x00007f3622827675 n/a (libc.so.6 + 0x27675)
#12 0x00007f3622827729 __libc_start_main (libc.so.6 + 0x27729)
#13 0x000055d26775d7a5 n/a (/usr/bin/file + 0x37a5)
ELF object binary architecture: AMD x86-64coredumpctl debug 794
PID: 794 (file)
UID: 0 (root)
GID: 0 (root)
Signal: 31 (SYS)
Timestamp: Thu 2025-08-07 19:12:07 UTC (5min ago)
Command Line: file abc
Executable: /usr/bin/file
Control Group: /user.slice/user-0.slice/session-1.scope
Unit: session-1.scope
Slice: user-0.slice
Session: 1
Owner UID: 0 (root)
Boot ID: 47075ab78af64e0ea62bc377828e0315
Machine ID: 46de833e1c444be99d3082b4e42cf52a
Hostname: archlinux
Storage: /var/lib/systemd/coredump/core.file.0.47075ab78af64e0ea62bc377828e0315.794.1754593927000000.zst (present)
Size on Disk: 79.9K
Message: Process 794 (file) of user 0 dumped core.
Stack trace of thread 794:
#0 0x00007f362290eb49 n/a (libc.so.6 + 0x10eb49)
#1 0x00007f362288003a _IO_file_doallocate (libc.so.6 + 0x8003a)
#2 0x00007f3622890226 _IO_doallocbuf (libc.so.6 + 0x90226)
#3 0x00007f362288e099 _IO_file_overflow (libc.so.6 + 0x8e099)
#4 0x00007f362288ecbb _IO_file_xsputn (libc.so.6 + 0x8ecbb)
#5 0x00007f362285b426 n/a (libc.so.6 + 0x5b426)
#6 0x00007f362285b50c n/a (libc.so.6 + 0x5b50c)
#7 0x00007f3622866e35 n/a (libc.so.6 + 0x66e35)
#8 0x00007f36229271fd __printf_chk (libc.so.6 + 0x1271fd)
#9 0x000055d26775dbd0 n/a (/usr/bin/file + 0x3bd0)
#10 0x000055d26775d075 n/a (/usr/bin/file + 0x3075)
#11 0x00007f3622827675 n/a (libc.so.6 + 0x27675)
#12 0x00007f3622827729 __libc_start_main (libc.so.6 + 0x27729)
#13 0x000055d26775d7a5 n/a (/usr/bin/file + 0x37a5)
ELF object binary architecture: AMD x86-64
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Reading symbols from /usr/bin/file...
This GDB supports auto-downloading debuginfo from the following URLs:
<https://debuginfod.archlinux.org>
[?2004hEnable debuginfod for this session? (y or [n]) y
[?2004l
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
Reading symbols from /root/.cache/debuginfod_client/da159afd79935522600c4e92965ee8c7e2a84fdd/debuginfo...
[New LWP 794]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/file abc'.
Program terminated with signal SIGSYS, Bad system call.
#0 __isatty_nostatus (fd=1) at ../sysdeps/unix/sysv/linux/isatty_nostatus.c:25
25 return INTERNAL_SYSCALL_CALL (ioctl, fd, TCGETS2, &k_termios) == 0;
[?2004h(gdb) thread apply all bactrace full
[?2004l
Thread 1 (Thread 0x7f3622a66740 (LWP 794)):
[?2004h(gdb) thread apply all bactrace full[C[1@k
[?2004l
Thread 1 (Thread 0x7f3622a66740 (LWP 794)):
#0 __isatty_nostatus (fd=1) at ../sysdeps/unix/sysv/linux/isatty_nostatus.c:25
k_termios = {c_iflag = 1041266496, c_oflag = 32767, c_cflag = 1041266048, c_lflag = 32767, c_line = 0 '\000', c_cc = "\000\000\000\000\000\000\000\233\212\202\"6\177\000\000\241\347\321g", c_ispeed = 21970, c_ospeed = 8}
#1 0x00007f362288003a in __GI__IO_file_doallocate (fp=0x7f3622a0a5c0 <_IO_2_1_stdout_>) at filedoalloc.c:83
size = 8192
p = <optimized out>
st = {st_dev = 6, st_ino = 20, st_nlink = 1, st_mode = 8576, st_uid = 0, st_gid = 5, __pad0 = 0, st_rdev = 1025, st_size = 0, st_blksize = 4096, st_blocks = 0, st_atim = {tv_sec = 1754593920, tv_nsec = 0}, st_mtim = {tv_sec = 1754593920, tv_nsec = 0}, st_ctim = {tv_sec = 1754593140, tv_nsec = 498896255}, __glibc_reserved = {0, 0, 0}}
#2 0x00007f3622890226 in __GI__IO_doallocbuf (fp=0x7f3622828a9b <find_derivation+1371>) at /usr/src/debug/glibc/glibc/libio/libioP.h:1041
No locals.
#3 __GI__IO_doallocbuf (fp=fp@entry=0x7f3622a0a5c0 <_IO_2_1_stdout_>) at genops.c:368
No locals.
#4 0x00007f362288e099 in _IO_new_file_overflow (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, ch=-1) at fileops.c:779
No locals.
#5 0x00007f362288ecbb in _IO_new_file_xsputn (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, data=<optimized out>, n=1) at /usr/src/debug/glibc/glibc/libio/libioP.h:1041
block_size = <optimized out>
do_write = <optimized out>
s = <optimized out>
to_do = <optimized out>
must_flush = <optimized out>
count = <optimized out>
#6 _IO_new_file_xsputn (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, data=<optimized out>, n=1) at fileops.c:1258
s = <optimized out>
to_do = 1
must_flush = 0
count = 0
p = <optimized out>
block_size = <optimized out>
do_write = <optimized out>
#7 0x00007f362285b426 in __printf_buffer_flush_to_file (buf=buf@entry=0x7fff3e107810) at ../libio/libioP.h:1041
count = <optimized out>
__PRETTY_FUNCTION__ = "__printf_buffer_flush_to_file"
#8 0x00007f362285b50c in __printf_buffer_to_file_done (buf=buf@entry=0x7fff3e107810) at printf_buffer_to_file.c:120
No locals.
#9 0x00007f3622866e35 in __vfprintf_internal (s=0x7f3622a0a5c0 <_IO_2_1_stdout_>, format=0x55d26775fac4 "%lc", ap=ap@entry=0x7fff3e107910, mode_flags=mode_flags@entry=2) at vfprintf-internal.c:1544
wrap = {base = {write_base = 0x7fff3e107840 "ax\020>\377\177", write_ptr = 0x7fff3e107841 "x\020>\377\177", write_end = 0x7fff3e1078c0 "`y\020>\377\177", written = 1, mode = __printf_buffer_mode_to_file}, fp = 0x7f3622a0a5c0 <_IO_2_1_stdout_>, stage = "ax\020>\377\177\000\000\000y\020>\377\177\000\000\000\000\000\000\000\000\000\000\370x\020>\377\177\000\000\320x\020>\377\177\000\000ē\202\"6\177\000\000q", '\000' <repeats 15 times>, "\320x\020>\377\177\000\000\240y\020>\377\177\000\000h\271\324g\322U\000\000\004\000\000\000\377\177\000\000Xy\020>\377\177\000\000\001\000\000\000\005", '\000' <repeats 18 times>}
done = <optimized out>
__result = <optimized out>
#10 0x00007f36229271fd in ___printf_chk (flag=flag@entry=2, format=format@entry=0x55d26775fac4 "%lc") at printf_chk.c:33
mode = 2
ap = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 0x7fff3e1079f0, reg_save_area = 0x7fff3e107930}}
ret = <optimized out>
#11 0x000055d26775dbd0 in printf (__fmt=0x55d26775fac4 "%lc") at /usr/include/bits/stdio2.h:118
No locals.
#12 fname_print (inname=0x7fff3e108e41 "bc") at /usr/src/debug/file/file/src/file.c:605
n = 2
state = {__count = 0, __value = {__wch = 0, __wchb = "\000\000\000"}}
nextchar = 97 L'a'
bytesconsumed = 1
n = <optimized out>
state = <optimized out>
nextchar = <optimized out>
bytesconsumed = <optimized out>
#13 process (ms=ms@entry=0x55d267d20060, inname=0x7fff3e108e40 "abc", wid=wid@entry=3) at /usr/src/debug/file/file/src/file.c:637
pname = <optimized out>
type = <optimized out>
c = <optimized out>
std_in = 0
haderror = 0
#14 0x000055d26775d075 in main (argc=2, argv=0x7fff3e107c78) at /usr/src/debug/file/file/src/file.c:441
c = <optimized out>
i = <optimized out>
j = <optimized out>
wid = <optimized out>
nw = <optimized out>
action = 0
didsomefiles = 0
errflg = 0
flags = 67108864
e = 0
sandbox = <optimized out>
magic = 0x55d267d20060
longindex = 0
magicfile = 0x0
progname = <optimized out>
[?2004h(gdb) bt
[?2004l
#0 __isatty_nostatus (fd=1) at ../sysdeps/unix/sysv/linux/isatty_nostatus.c:25
#1 0x00007f362288003a in __GI__IO_file_doallocate (fp=0x7f3622a0a5c0 <_IO_2_1_stdout_>) at filedoalloc.c:83
#2 0x00007f3622890226 in __GI__IO_doallocbuf (fp=0x7f3622828a9b <find_derivation+1371>) at /usr/src/debug/glibc/glibc/libio/libioP.h:1041
#3 __GI__IO_doallocbuf (fp=fp@entry=0x7f3622a0a5c0 <_IO_2_1_stdout_>) at genops.c:368
#4 0x00007f362288e099 in _IO_new_file_overflow (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, ch=-1) at fileops.c:779
#5 0x00007f362288ecbb in _IO_new_file_xsputn (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, data=<optimized out>, n=1) at /usr/src/debug/glibc/glibc/libio/libioP.h:1041
#6 _IO_new_file_xsputn (f=0x7f3622a0a5c0 <_IO_2_1_stdout_>, data=<optimized out>, n=1) at fileops.c:1258
#7 0x00007f362285b426 in __printf_buffer_flush_to_file (buf=buf@entry=0x7fff3e107810) at ../libio/libioP.h:1041
#8 0x00007f362285b50c in __printf_buffer_to_file_done (buf=buf@entry=0x7fff3e107810) at printf_buffer_to_file.c:120
#9 0x00007f3622866e35 in __vfprintf_internal (s=0x7f3622a0a5c0 <_IO_2_1_stdout_>, format=0x55d26775fac4 "%lc", ap=ap@entry=0x7fff3e107910,
mode_flags=mode_flags@entry=2) at vfprintf-internal.c:1544
#10 0x00007f36229271fd in ___printf_chk (flag=flag@entry=2, format=format@entry=0x55d26775fac4 "%lc") at printf_chk.c:33
#11 0x000055d26775dbd0 in printf (__fmt=0x55d26775fac4 "%lc") at /usr/include/bits/stdio2.h:118
#12 fname_print (inname=0x7fff3e108e41 "bc") at /usr/src/debug/file/file/src/file.c:605
#13 process (ms=ms@entry=0x55d267d20060, inname=0x7fff3e108e40 "abc", wid=wid@entry=3) at /usr/src/debug/file/file/src/file.c:637
#14 0x000055d26775d075 in main (argc=2, argv=0x7fff3e107c78) at /usr/src/debug/file/file/src/file.c:441
[?2004h(gdb) q
[?2004lI really hate this damn machine,
I wish that they would sell it.
It never does just what I want,
But only what I tell it. -Anonymous
Offline
#6 2025-08-07 19:46:27
- seth
- Member
- From: Don't DM me only for attention
- Registered: 2012-09-03
- Posts: 73,706
Re: [SOLVED] glibc 2.42 breaks file command in a tty
strace'ing also prevents the segfault?
Do you get backtrace symbols w/ https://wiki.archlinux.org/title/Debuginfod ?
Looks like malloc, makes me wonder whether it's more https://gitlab.archlinux.org/archlinux/ … 26b0f82ccf than the update…
Offline
#7 2025-08-07 21:35:04
- rossboulet
- Member
- Registered: 2015-01-23
- Posts: 35
Re: [SOLVED] glibc 2.42 breaks file command in a tty
I saw that in the strace but it didn't snap. It worked because I piped stdout and stderr to a file. Running strace file abc with no pipe does dump.
I haven't done the other things you asked about. I'm headed out the door but I can do them later if you need them.
Here is an strace with no pipe:
execve("/usr/bin/file", ["file", "abc"], 0x7ffef2cdb398 /* 21 vars */) = 0
brk(NULL) = 0x55589166c000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=24667, ...}) = 0
mmap(NULL, 24667, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f7240cb0000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libmagic.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=174328, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7240cae000
mmap(NULL, 173160, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240c83000
mmap(0x7f7240c86000, 122880, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f7240c86000
mmap(0x7f7240ca4000, 28672, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x21000) = 0x7f7240ca4000
mmap(0x7f7240cab000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x28000) = 0x7f7240cab000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libseccomp.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=133136, ...}) = 0
mmap(NULL, 131168, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240c62000
mmap(0x7f7240c64000, 61440, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f7240c64000
mmap(0x7f7240c73000, 57344, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f7240c73000
mmap(0x7f7240c81000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f000) = 0x7f7240c81000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000x\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
fstat(3, {st_mode=S_IFREG|0755, st_size=2149728, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 896, 64) = 896
mmap(NULL, 2174000, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240a00000
mmap(0x7f7240a24000, 1515520, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7f7240a24000
mmap(0x7f7240b96000, 454656, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x196000) = 0x7f7240b96000
mmap(0x7f7240c05000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x204000) = 0x7f7240c05000
mmap(0x7f7240c0b000, 31792, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f7240c0b000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libzstd.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=935880, ...}) = 0
mmap(NULL, 933944, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f724091b000
mmap(0x7f7240927000, 811008, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xc000) = 0x7f7240927000
mmap(0x7f72409ed000, 69632, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd2000) = 0x7f72409ed000
mmap(0x7f72409fe000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe3000) = 0x7f72409fe000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=211152, ...}) = 0
mmap(NULL, 209112, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240c2e000
mmap(0x7f7240c32000, 143360, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f7240c32000
mmap(0x7f7240c55000, 45056, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x27000) = 0x7f7240c55000
mmap(0x7f7240c60000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x32000) = 0x7f7240c60000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libbz2.so.1.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=74720, ...}) = 0
mmap(NULL, 76840, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240c1b000
mmap(0x7f7240c1d000, 53248, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f7240c1d000
mmap(0x7f7240c2a000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f7240c2a000
mmap(0x7f7240c2c000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x7f7240c2c000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=100368, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7240c19000
mmap(NULL, 98320, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7240902000
mmap(0x7f7240905000, 57344, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f7240905000
mmap(0x7f7240913000, 24576, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x11000) = 0x7f7240913000
mmap(0x7f7240919000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7f7240919000
close(3) = 0
mmap(NULL, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7240c16000
arch_prctl(ARCH_SET_FS, 0x7f7240c16740) = 0
set_tid_address(0x7f7240c16a10) = 1404
set_robust_list(0x7f7240c16a20, 24) = 0
rseq(0x7f7240c16680, 0x20, 0, 0x53053053) = 0
mprotect(0x7f7240c05000, 16384, PROT_READ) = 0
mprotect(0x7f7240919000, 4096, PROT_READ) = 0
mprotect(0x7f7240c2c000, 4096, PROT_READ) = 0
mprotect(0x7f7240c60000, 4096, PROT_READ) = 0
mprotect(0x7f72409fe000, 4096, PROT_READ) = 0
mprotect(0x7f7240c81000, 4096, PROT_READ) = 0
mprotect(0x7f7240cab000, 8192, PROT_READ) = 0
mprotect(0x5558700f0000, 4096, PROT_READ) = 0
mprotect(0x7f7240cf8000, 8192, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
getrandom("\xd1\xa4\x98\x9b\x02\x4c\xb6\xc2", 8, GRND_NONBLOCK) = 8
munmap(0x7f7240cb0000, 24667) = 0
brk(NULL) = 0x55589166c000
brk(0x55589168d000) = 0x55589168d000
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2998, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2998
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/lib/locale/C.UTF-8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/C.utf8/LC_CTYPE", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=367708, ...}) = 0
mmap(NULL, 367708, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f72408a8000
close(3) = 0
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.cache", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=3916, ...}) = 0
read(3, "# GNU libc iconv configuration.\n"..., 4096) = 3916
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.d", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
getdents64(3, 0x555891670130 /* 3 entries */, 32768) = 96
openat(AT_FDCWD, "/usr/lib/gconv/gconv-modules.d/gconv-modules-extra.conf", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=53974, ...}) = 0
read(4, "# GNU libc iconv configuration.\n"..., 4096) = 4096
read(4, "B1002//\tJUS_I.B1.002//\nmodule\tJU"..., 4096) = 4096
read(4, "59-5//\nalias\tISO_8859-5//\t\tISO-8"..., 4096) = 4096
read(4, "59-16//\t\tINTERNAL\t\tISO8859-16\t1\n"..., 4096) = 4096
read(4, "-SE-A\t1\nmodule\tINTERNAL\t\tEBCDIC-"..., 4096) = 4096
read(4, "97\t\t1\n\n#\tfrom\t\t\tto\t\t\tmodule\t\tcos"..., 4096) = 4096
read(4, "1\n\n#\tfrom\t\t\tto\t\t\tmodule\t\tcost\nal"..., 4096) = 4096
read(4, "6//\t\tIBM1046//\nalias\tCP1046//\t\tI"..., 4096) = 4096
read(4, "\tto\t\t\tmodule\t\tcost\nalias\tRUSCII/"..., 4096) = 4096
brk(0x5558916ae000) = 0x5558916ae000
read(4, "03//\nmodule\tCSN_369103//\t\tINTERN"..., 4096) = 4096
read(4, "\tmodule\t\tcost\nalias\tISO-IR-8-1//"..., 4096) = 4096
read(4, "IBM1156\t\t1\n\n#\tfrom\t\t\tto\t\t\tmodule"..., 4096) = 4096
read(4, "\t\tIBM1166//\nalias\tCP1166//\t\tIBM1"..., 4096) = 4096
read(4, "alias\tROMAN9//\t\tHP-ROMAN9//\nalia"..., 4096) = 726
read(4, "", 4096) = 0
close(4) = 0
getdents64(3, 0x555891670130 /* 0 entries */, 32768) = 0
close(3) = 0
futex(0x7f7240c0a72c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
seccomp(SECCOMP_SET_MODE_STRICT, 0x1, NULL) = -1 EINVAL (Invalid argument)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_GET_ACTION_AVAIL, 0, [SECCOMP_RET_LOG]) = 0
seccomp(SECCOMP_GET_ACTION_AVAIL, 0, [SECCOMP_RET_KILL_PROCESS]) = 0
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_SPEC_ALLOW, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_NEW_LISTENER, NULL) = -1 EFAULT (Bad address)
seccomp(SECCOMP_GET_NOTIF_SIZES, 0, {seccomp_notif=80, seccomp_notif_resp=24, seccomp_data=64}) = 0
seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC_ESRCH, NULL) = -1 EFAULT (Bad address)
prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
seccomp(SECCOMP_SET_MODE_FILTER, 0, {len=63, filter=0x55589169d190}) = 0
newfstatat(AT_FDCWD, "/root/.magic.mgc", 0x7ffee9c265f0, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/root/.magic", 0x7ffee9c265f0, 0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/file/misc/magic.mgc", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=10357200, ...}) = 0
mmap(NULL, 10357200, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0x7f723fe00000
close(3) = 0
mprotect(0x7f723fe00000, 10357200, PROT_READ) = 0
mmap(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7240887000
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x4, 0x1), ...}) = 0
ioctl(1, TCGETS2, {c_iflag=INPCK|IGNCR|IXON|IMAXBEL|IUTF8|0xe9c20000, c_oflag=NL1|CR3|XTABS|BS1|VT1|FF0|OLCUC|ONLCR|OCRNL|ONOCR|ONLRET|OFILL|OFDEL, c_cflag=B0|B75<<IBSHIFT|CS6|CSTOPB|CREAD|PARODD|CMSPAR|CRTSCTS|0x29c06000, c_lflag=ICANON|XCASE|ECHO|ECHOE|ECHOK|ECHONL|NOFLSH|ECHOCTL|ECHOPRT|ECHOKE|FLUSHO|PENDIN|TOSTOP|0x2000, ...}) = 16
+++ killed by SIGSYS (core dumped) +++I really hate this damn machine,
I wish that they would sell it.
It never does just what I want,
But only what I tell it. -Anonymous
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#8 2025-08-07 22:22:59
- seth
- Member
- From: Don't DM me only for attention
- Registered: 2012-09-03
- Posts: 73,706
Re: [SOLVED] glibc 2.42 breaks file command in a tty
ioctl(1, TCGETS2, {c_iflag=INPCK|IGNCR|IXON|IMAXBEL|IUTF8|0xe9c20000, c_oflag=NL1|CR3|XTABS|BS1|VT1|FF0|OLCUC|ONLCR|OCRNL|ONOCR|ONLRET|OFILL|OFDEL, c_cflag=B0|B75<<IBSHIFT|CS6|CSTOPB|CREAD|PARODD|CMSPAR|CRTSCTS|0x29c06000, c_lflag=ICANON|XCASE|ECHO|ECHOE|ECHOK|ECHONL|NOFLSH|ECHOCTL|ECHOPRT|ECHOKE|FLUSHO|PENDIN|TOSTOP|0x2000, ...}) = 16
+++ killed by SIGSYS (core dumped) +++I suspect https://sourceware.org/git/?p=glibc.git … 14632fbb5f would have mandated the reverted https://sourceware.org/git/?p=glibc.git … 3779995a86 ?
Try to disable seccomp, file only allows TCGETS
file -S abcOffline
#9 2025-08-07 23:02:03
- Toolybird
- Member
- Registered: 2017-09-30
- Posts: 87
Re: [SOLVED] glibc 2.42 breaks file command in a tty
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#10 2025-08-08 06:34:09
- seth
- Member
- From: Don't DM me only for attention
- Registered: 2012-09-03
- Posts: 73,706
Re: [SOLVED] glibc 2.42 breaks file command in a tty
So ftr: yeah, it's seccomp+TCGETS2
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#11 2025-08-10 06:15:55
- StarWolf3000
- Member
- Registered: 2025-06-23
- Posts: 62
Re: [SOLVED] glibc 2.42 breaks file command in a tty
Fixed by https://gitlab.archlinux.org/archlinux/ … 030f3b29da
file-5.46-5Mainboard: GIGABYTE B550 AORUS ELITE V2 | CPU: Ryzen 7 5800X | RAM: 32 GB
GPU: GeForce RTX 4060 8 GB (580.119.02 proprietary) | Display: BenQ BL2405 1920x1080
Kernel: 6.18.8 stable | Boot Manager: GRUB2 | DE: KDE Plasma | Login Manager: SDDM | Compositor: KWin
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