Arch Linux

0BADC0DE

Member

From: Regnum Utriusque Siciliae

Registered: 2018-02-21

Posts: 270

ddcutil dumps the core under linux-zen 6.8.2.zen1-1

Since my last update of kernel linux-zen (6.8.1.zen1-1 -> 6.8.2.zen1-1) I am getting ddcutil dumping the core.
As a side affect, automount isn't working any more.
Rolling back to previous kernel version fixes everything.
Upstream bug is here.

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Maybe Computers Will Never Become As Intelligent
As Humans. Surely They Won't Ever Become So Stupid.

loqs

Member

Registered: 2014-03-06

Posts: 17,458

Re: ddcutil dumps the core under linux-zen 6.8.2.zen1-1

It might help to provide upstream with the backtrace with debug symbols from the core dump.  The results of the bisecting between 6.8.1.zen1-1 and 6.8.2.zen1-1 and if the issue is limited to zen.

Leprotto

Member

Registered: 2023-07-07

Posts: 14

Re: ddcutil dumps the core under linux-zen 6.8.2.zen1-1

It might help to provide upstream with the backtrace with debug symbols from the core dump.  The results of the bisecting between 6.8.1.zen1-1 and 6.8.2.zen1-1 and if the issue is limited to zen.

I run kernel 6.8.4-zen1-1-zen. I can help with the trace but haven't tested other kernels.

Reading symbols from /usr/bin/ddcutil...
Reading symbols from /usr/lib/debug/usr/bin/ddcutil.debug...
[New LWP 403]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/ddcutil chkusbmon /dev/usb/hiddev1 -v'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:76
76              VPCMPEQ (%rdi), %ymm0, %ymm1
(gdb) bt
#0  __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:76
#1  0x00005b95a72d2031 in strsplit (str_to_split=0x0, delims=0x5b95a72edaea ":") at util/string_util.c:455
#2  0x00005b95a72e44ba in avoid_device_by_usb_interfaces_property_string (interfaces=0x0) at usb/usb_displays.c:346
#3  0x00005b95a72e4778 in is_possible_monitor_by_hiddev_name (hiddev_name=hiddev_name@entry=0x5b95a7d89d60 "/dev/usb/hiddev1") at usb/usb_displays.c:405
#4  0x00005b95a72e48a9 in check_usb_monitor (device_name=0x5b95a7d89d60 "/dev/usb/hiddev1") at usb/usb_displays.c:903
#5  0x00005b95a7262752 in main (argc=<optimized out>, argv=<optimized out>) at app_ddcutil/main.c:1034

To mitigate the issue i commented out the rule in /usr/lib/udev/rules.d/60-ddcutil-usb.rules, since i don't use USB monitors. But it will be reversed whenever new hooks happens.

Last edited by Leprotto (2024-04-08 00:59:20)

loqs

Member

Registered: 2014-03-06

Posts: 17,458

Re: ddcutil dumps the core under linux-zen 6.8.2.zen1-1

At https://github.com/rockowitz/ddcutil/bl … ays.c#L404 interfaces is null which passes that value to avoid_device_by_usb_interfaces_property_string which passes it to strsplit which calls strlen on null triggering the segmentation fault.  I would suggest raising this with upstream ddcutil.

Leprotto

Member

Registered: 2023-07-07

Posts: 14

Re: ddcutil dumps the core under linux-zen 6.8.2.zen1-1

At https://github.com/rockowitz/ddcutil/bl … ays.c#L404 interfaces is null which passes that value to avoid_device_by_usb_interfaces_property_string which passes it to strsplit which calls strlen on null triggering the segmentation fault.  I would suggest raising this with upstream ddcutil.

Done.

Last edited by Leprotto (2024-04-10 16:55:48)

Leprotto

Member

Registered: 2023-07-07

Posts: 14

Re: ddcutil dumps the core under linux-zen 6.8.2.zen1-1

As https://github.com/rockowitz/ddcutil/co … 14a96ea35a it should be fixed now.

Last edited by Leprotto (2024-04-10 17:29:55)