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    SubjectRe: PROBLEM: Kernel panic and system crash during RAID disk failure
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    Hi Darko,

    The bug has been fixed by commit 0449641130 ext4: Init timer earlier
    to avoid a kernel panic in __save_error_info.
    http://lists.openwall.net/linux-ext4/2011/03/29/5


    I suspect you mounted ext2/3 partition using ext4 module.


    Yongqiang.

    On Mon, Oct 31, 2011 at 11:13 AM, Darko <darko@hytron.net> wrote:
    > Thank you for your reply!
    >
    > I wanted to add to this that I was able to replicate the problem with ext3
    > and ext2 file systems as well. They both hard lock the system, and the only
    > way to recovery is to push the reset button. I can see the trace error on
    > the screen, but I am unable to do anything with it, since it goes by so fast
    > that the portion which says "kernel BUG" is invisible. I assume they both
    > have similar issues with the code in kernel/timer.c
    >
    > On the other hand, I tried using raiserfs 3.5 tonight, and I got
    > input/output error as expected. The system did not crash. Just another proof
    > that a bug is laying somewhere in the ext2/3/4 file system.
    >
    > When someone comes up with a patch, I am willing to try it out and feed you
    > back with the report.
    >
    > Hope this helps.
    >
    > Thank You,
    >
    > Darko Kraus
    >
    >
    > On Sun, 30 Oct 2011, NeilBrown wrote:
    >
    >> Date: Sun, 30 Oct 2011 19:05:48 +1100
    >> From: NeilBrown <neilb@suse.de>
    >> To: Darko <darko@hytron.net>
    >> Cc: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
    >>    linux-ext4@vger.kernel.org
    >> Subject: Re: PROBLEM: Kernel panic and system crash during RAID disk
    >> failure
    >>
    >> On Sun, 30 Oct 2011 03:27:28 -0400 (EDT) Darko <darko@hytron.net> wrote:
    >>
    >>> Hello,
    >>>
    >>> I have been doing some testing with the md RAID driver and I think I
    >>> discovered a problem with it.
    >>> Everything was performed on a system with a single hard drive using loop
    >>> devices as virtual raid devices.
    >>> So here is the setup:
    >>> /dev/sdc is my main drive that hold entire Linux OS and has one
    >>> partition.
    >>> in the /tmp I created 7 files, 100MB each and associated them with loop
    >>> devices:
    >>>
    >>> losetup -a
    >>> /dev/loop0: [0821]:294820 (/var/tmp/raid-0)
    >>> /dev/loop1: [0821]:294857 (/var/tmp/raid-1)
    >>> /dev/loop2: [0821]:300120 (/var/tmp/raid-2)
    >>> /dev/loop3: [0821]:301073 (/var/tmp/raid-3)
    >>> /dev/loop4: [0821]:301074 (/var/tmp/raid-4)
    >>> /dev/loop5: [0821]:301075 (/var/tmp/raid-5)
    >>> /dev/loop6: [0821]:301076 (/var/tmp/raid-6)
    >>>
    >>> The next step was, created an RAID6 array:
    >>> mdadm --create /dev/md10 --level=6 -raid-deviced=7 /dev/loop[0-6]
    >>>
    >>> Here is how it looks so far:
    >>>
    >>> cat /proc/mdstat
    >>> Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
    >>> md10 : active raid6 loop6[6] loop5[5] loop4[4] loop3[3] loop2[2] loop1[1]
    >>> loop0[0]
    >>>       499200 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7]
    >>> [UUUUUUU]
    >>>
    >>>
    >>> Then the filesystem...
    >>> mkfs.ext4 -b 4096 -i 4096 -m 0 /dev/md10
    >>>
    >>> Mounting the file system to a folder called 'A' right in the root of my
    >>> system:
    >>>
    >>> mount /dev/md10 /A
    >>>
    >>> Then I copied a few files on that file system. So far everything is good.
    >>>
    >>> Then I purposly failed 2 drives:
    >>> mdadm --manage /dev/md10 --fail /dev/loop0
    >>> mdadm --manage /dev/md10 --fail /dev/loop1
    >>>
    >>> The array continues to run fine in degraded mode. I was wondering what
    >>> would happen if another drive fails. So while I was doing a write
    >>> operating right in that filesystem (/dev/md10) using:
    >>> dd if=/dev/zero of=testfile bs=1k count=360000  ...
    >>>
    >>> ...quickly switched to a different console and entered the command:
    >>> mdadm --manage /dev/md10 --fail /dev/loop2
    >>>
    >>> ...which made 3 failed drives and the array can no longer work...
    >>>
    >>> Well I would be happy to see just the array not working, but kernel panic
    >>> in both versions 2.6.37.4 and 3.0.8 made me worry that it is serious bug
    >>> and appears to be in older and newer kernels as well.
    >>> I repeated this several times, and mostly the machine gets locked up with
    >>> kernel panic. But once I was able to get it not to lock up all the way,
    >>> and that is how I have dmesg output.
    >>>
    >>> The attached files include dmesg from the system startup until the bug
    >>> trace, and some additional information regarding my system that might be
    >>> helpful.
    >>>
    >>> For any additional question, please feel free to contact me!
    >>>
    >>> I hope this info helps someone find and resolve the problem in the code.
    >>>
    >>
    >> The important part of your kernel log message is:
    >>
    >>
    >> [ 1227.766202] ------------[ cut here ]------------
    >> [ 1227.766259] kernel BUG at kernel/timer.c:681!
    >> [ 1227.766311] invalid opcode: 0000 [#1] SMP
    >> [ 1227.766365] last sysfs file: /sys/devices/virtual/block/md10/dev
    >> [ 1227.766419] Modules linked in:
    >> [ 1227.766471]
    >> [ 1227.766520] Pid: 1507, comm: mount Not tainted 2.6.37.6-v5.0 #7
    >> MICRO-STAR INTERNATIONAL CO., LTD MS-7142/MS-7142
    >> [ 1227.766633] EIP: 0060:[<c104f960>] EFLAGS: 00010246 CPU: 0
    >> [ 1227.766690] EIP is at mod_timer+0x210/0x250
    >> [ 1227.766742] EAX: 00000000 EBX: f5494e1c ECX: 00000000 EDX: 00000000
    >> [ 1227.766796] ESI: 00000000 EDI: 05348416 EBP: f54a3c90 ESP: f54a3c74
    >> [ 1227.766851]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
    >> [ 1227.766904] Process mount (pid: 1507, ti=f54a2000 task=f2068880
    >> task.ti=f54a2000)
    >> [ 1227.767002] Stack:
    >> [ 1227.767003]  f2068880 f54b159c 00000010 00000000 f1f8e400 f4efc57c
    >> 0000128d f54a3ca8
    >> [ 1227.767003]  c11cb7ba c17d4e52 f4efc400 00000124 00000000 f54a3cb4
    >> c11ce4e6 ecee6318
    >> [ 1227.767003]  f54a3cdc c11cf7cc ecec7578 00000124 00000000 f4efc400
    >> f54a3cd4 00000124
    >> [ 1227.767003] Call Trace:
    >> [ 1227.767003]  [<c11cb7ba>] ? __save_error_info.clone.61+0x7a/0xf0
    >> [ 1227.767003]  [<c11ce4e6>] ? save_error_info+0x16/0x30
    >> [ 1227.767003]  [<c11cf7cc>] ? ext4_error_inode+0x4c/0xf0
    >> [ 1227.767003]  [<c11b57e1>] ? __ext4_get_inode_loc+0x201/0x410
    >> [ 1227.767003]  [<c110b62a>] ? inode_init_always+0x1aa/0x1c0
    >> [ 1227.767003]  [<c11b72f9>] ? ext4_iget+0x59/0x6f0
    >> [ 1227.767003]  [<c11d2716>] ? ext4_fill_super+0x1ab6/0x2c70
    >> [ 1227.767003]  [<c114896f>] ? disk_name+0xbf/0xd0
    >> [ 1227.767003]  [<c10fa119>] ? mount_bdev+0x179/0x1c0
    >> [ 1227.767003]  [<c11d0c60>] ? ext4_fill_super+0x0/0x2c70
    >> [ 1227.767003]  [<c11ca17f>] ? ext4_mount+0x1f/0x30
    >> [ 1227.767003]  [<c11d0c60>] ? ext4_fill_super+0x0/0x2c70
    >> [ 1227.767003]  [<c10f9835>] ? vfs_kern_mount+0x75/0x250
    >> [ 1227.767003]  [<c110df03>] ? get_fs_type+0x33/0xb0
    >> [ 1227.767003]  [<c11ca160>] ? ext4_mount+0x0/0x30
    >> [ 1227.767003]  [<c10f9a6e>] ? do_kern_mount+0x3e/0xe0
    >> [ 1227.767003]  [<c111080f>] ? do_mount+0x35f/0x6b0
    >> [ 1227.767003]  [<c10d47c9>] ? strndup_user+0x49/0x70
    >> [ 1227.767003]  [<c1110e0b>] ? sys_mount+0x6b/0xa0
    >> [ 1227.767003]  [<c17b550c>] ? syscall_call+0x7/0xb
    >> [ 1227.767003] Code: fe ff ff 8b 0e 89 4d e4 8b 46 04 83 c6 08 89 f9 89 da
    >> ff 55 e4 8b 06 85 c0 89 45 e4 75 ea e9 aa fe ff ff 8b 75 ec e9 ee fe ff ff
    >> <0f> 0b 8b 55 04 89 d8 e8 34 f9 ff ff e9 2a fe ff ff 8b 35 30 b8
    >> [ 1227.767003] EIP: [<c104f960>] mod_timer+0x210/0x250 SS:ESP
    >> 0068:f54a3c74
    >> [ 1227.770073] ---[ end trace d7b3d7a67954d202 ]---
    >>
    >>
    >> which happens after:
    >>
    >> [ 1137.167043] Aborting journal on device md10-8.
    >> [ 1137.167058] Buffer I/O error on device md10, logical block 139265
    >> [ 1137.167060] lost page write due to I/O error on md10
    >> [ 1137.167065] JBD2: I/O error detected when updating journal superblock
    >> for md10-8.
    >> [ 1137.660922] Buffer I/O error on device md10, logical block 1
    >> [ 1137.660926] lost page write due to I/O error on md10
    >> [ 1137.660932] EXT4-fs error (device md10): ext4_journal_start_sb:260:
    >> Detected aborted journal
    >> [ 1137.661046] EXT4-fs (md10): Remounting filesystem read-only
    >> [ 1137.661103] EXT4-fs (md10): previous I/O error to superblock detected
    >> [ 1137.661313] Buffer I/O error on device md10, logical block 1
    >> [ 1137.661315] lost page write due to I/O error on md10
    >> [ 1219.891363] EXT4-fs (md10): previous I/O error to superblock detected
    >> [ 1220.050654] Buffer I/O error on device md10, logical block 1
    >> [ 1220.050657] lost page write due to I/O error on md10
    >> [ 1220.050663] EXT4-fs error (device md10): ext4_put_super:728: Couldn't
    >> clean up the journal
    >>
    >> and some more "Buffer I/O error"s.
    >>
    >> So it looks like an ext4 issue.
    >>
    >> I have Cc:ed the appropriate list.
    >>
    >> Thanks for the report.
    >>
    >> NeilBrown
    >>
    >>
    >
    >
    > --
    > Darko Kraus
    > Enterprise Network Administrator
    >
    > --
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    --
    Best Wishes
    Yongqiang Yang
    --
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