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Hello all.
Yesterday I had a kernel panic on my ThinkPad X201. It happened while I was reindexing mu's email database from Emacs, and now every time I reboot I get the same error, and it drops me in a recovery shell.
I have a Samsung 840 EVO and use dm-crypt (I get to enter the password before the error is triggered). The stacktrace I get seems to indicate a problem with btrfs stack, up to the actual crashing function - I can provide a picture if it helps.
Is there any way I can investigate this further, either from the recovery shell or from Arch live ISO? Thanks for any feedback.
Last edited by mrz87 (2014-11-14 09:41:57)
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Could you post the result of "journelctl | grep BTRFS" as well as "dmesg"?
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Mmh journalctl is not available from the recovery shell, and in dmesg there's nothing more that the stracktrace from the error. I could provide that, but I tried booting the live ISO and from there mount my partition - after the `cryptsetup open` phase when mounting the partition I get the same error - subsequent tries seem to lock the device, can't ^C out of the second `mount` command I try. So yeah I'm thinking this is hosed, unless someone can chip in with some suggestions. Additionally, smartcl -t short didn't find any problems, if it can help.
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Try running btrfsck on it? You'd have to cryptsetup open it first and then instead of mounting it do for example
btrfsck /dev/mapper/cryptrootIf that doesn't fix it then yea post the stacktrace and the exact error you're getting.
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Ehi weirddan, I found out about btrfsck earlier today and indeed I managed to mount and reboot my machine. The weird this is, the very next time I tried to reindex mu's database, I got the same error - kernel panic and errors at reboot. I've rebooted into the live ISO and ran btrfsck again, same output as before (a shitload of errors in the command output, but a mountable FS). I am thinking of backing up the most urgent things and starting from scratch - possibly with a more stable FS. I really really would like to know what is causing this though, it seems weird.
EDIT: additionally, I have the output of dmesg FULL of errors. Stuff like
[ 2570.191666] ------------[ cut here ]------------
[ 2570.191675] WARNING: CPU: 0 PID: 119 at fs/btrfs/super.c:259 __btrfs_abort_transaction+0x50/0x110 [btrfs]()
[ 2570.191677] BTRFS: Transaction aborted (error -2)
[ 2570.191678] Modules linked in: joydev mousedev snd_hda_codec_hdmi snd_hda_codec_conexant snd_hda_codec_generic iTCO_wdt iTCO_vendor_support arc4 iwldvm mac80211 intel_powerclamp kvm_intel iwlwifi intel_ips kvm serio_raw psmouse i2c_i801 pcspkr cfg80211 lpc_ich thinkpad_acpi wmi thermal nvram led_class tpm_tis rfkill battery ac tpm evdev mac_hid acpi_cpufreq snd_hda_intel processor snd_hda_controller snd_hda_codec snd_hwdep snd_pcm e1000e snd_timer snd shpchp mei_me soundcore ptp mei pps_core intel_agp sch_fq_codel tp_smapi(O) thinkpad_ec(O) coretemp hwmon msr btrfs xor raid6_pq algif_skcipher af_alg dm_crypt dm_mod sd_mod crc_t10dif atkbd libps2 crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd ahci libahci
[ 2570.191724] libata scsi_mod ehci_pci ehci_hcd usbcore usb_common i8042 serio i915 button intel_gtt i2c_algo_bit video drm_kms_helper drm i2c_core
[ 2570.191735] CPU: 0 PID: 119 Comm: kworker/u8:6 Tainted: G W O 3.17.3-1-ARCH #1
[ 2570.191737] Hardware name: LENOVO 362611G/362611G, BIOS 6QET47WW (1.17 ) 07/14/2010
[ 2570.191750] Workqueue: btrfs-extent-refs btrfs_extent_refs_helper [btrfs]
[ 2570.191751] 0000000000000000 000000005447cd61 ffff8800379bba40 ffffffff815378be
[ 2570.191755] ffff8800379bba88 ffff8800379bba78 ffffffff8107078d 00000000fffffffe
[ 2570.191758] ffff8801f768e140 ffff88022e567000 ffffffffa03b5330 000000000000174a
[ 2570.191761] Call Trace:
[ 2570.191764] [<ffffffff815378be>] dump_stack+0x4d/0x6f
[ 2570.191767] [<ffffffff8107078d>] warn_slowpath_common+0x7d/0xa0
[ 2570.191772] [<ffffffff8107080c>] warn_slowpath_fmt+0x5c/0x80
[ 2570.191782] [<ffffffffa0308d10>] __btrfs_abort_transaction+0x50/0x110 [btrfs]
[ 2570.191792] [<ffffffffa031c904>] __btrfs_free_extent+0x714/0xc80 [btrfs]
[ 2570.191796] [<ffffffff812a9101>] ? cpumask_next_and+0x31/0x50
[ 2570.191807] [<ffffffffa0321d7c>] __btrfs_run_delayed_refs+0x47c/0x12d0 [btrfs]
[ 2570.191810] [<ffffffff810a51ef>] ? dequeue_entity+0x13f/0x580
[ 2570.191814] [<ffffffff810954ce>] ? ttwu_stat+0x9e/0x110
[ 2570.191826] [<ffffffffa0326de3>] btrfs_run_delayed_refs.part.57+0x73/0x270 [btrfs]
[ 2570.191837] [<ffffffffa0327088>] delayed_ref_async_start+0x88/0xa0 [btrfs]
[ 2570.191851] [<ffffffffa03689c3>] normal_work_helper+0x73/0x350 [btrfs]
[ 2570.191854] [<ffffffff81085c7d>] ? pwq_activate_delayed_work+0x3d/0xa0
[ 2570.191867] [<ffffffffa0369052>] btrfs_extent_refs_helper+0x12/0x20 [btrfs]
[ 2570.191871] [<ffffffff81088df5>] process_one_work+0x145/0x400
[ 2570.191874] [<ffffffff810893bb>] worker_thread+0x6b/0x4a0
[ 2570.191877] [<ffffffff81089350>] ? init_pwq.part.22+0x10/0x10
[ 2570.191880] [<ffffffff8108e2da>] kthread+0xea/0x100
[ 2570.191883] [<ffffffff8108e1f0>] ? kthread_create_on_node+0x1b0/0x1b0
[ 2570.191886] [<ffffffff8153d83c>] ret_from_fork+0x7c/0xb0
[ 2570.191889] [<ffffffff8108e1f0>] ? kthread_create_on_node+0x1b0/0x1b0
[ 2570.191891] ---[ end trace 222ef6a3d2bd0765 ]---
[ 2570.191894] BTRFS warning (device dm-0): __btrfs_free_extent:5962: Aborting unused transaction(No such entry).
[ 2570.191898] BTRFS warning (device dm-0): btrfs_run_delayed_refs:2806: Aborting unused transaction(No such entry).I'll backup what's important and nuke this installation. Hopefully this is not caused by hardware failure - smartctl seems to be happy about the health of my SSD, hopefully it's right.
Last edited by mrz87 (2014-11-17 11:06:16)
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