After the update to gentoo-sources-2.6.39 my machine occassionally shows "kernel BUG at mm/shmem.c" during shutdown (also see attached file). This happened about 2 out of 10 times. If this is shown during shutdown, my file systems replay a lot of transactions during the next boot. Reproducible: Sometimes Steps to Reproduce: After trying to shutdown the machine via the GNOME logout/shutdown menu option, the attached errors are shown on my screen. After a while the gdm login screen is shown again and I can shutdown the system via the gdm shutdown button with no further errors. I was not able to reproduce the problem. I set the severity to critical, since the crash seems to force a complete transaction replay on file system level during the next boot. This might as well lead to data loss.
Created attachment 274747 [details] errors logged at /var/log/messages
We hit this same bug in 2.6.39-wl (wireless testing), on Fedora 14 machine. Shutting down interface eth1: [ OK ] Shutting down loopback interface: [ OK ] Stopping monitoring for VG VolGroup: 3 logical volume(s) in volume group "VolGroup" unmonitored [ OK ] Sending all processes the TERM signal... [ OK ] Sending all processes the KILL signal... [ OK ] Saving random seed: [ OK ] Syncing hardware clock to system time [ OK ] Turning off swap: [ OK ] Turning off quotas: [ OK ] Unmounting pipe file systems: [ OK ] Unmounting file systems: [ OK ] ------------[ cut here ]------------ kernel BUG at /home/greearb/git/linux.wireless-testing-ct/mm/shmem.c:719! invalid opcode: 0000 [#1] SMP last sysfs file: /sys/devices/virtual/block/dm-1/dm/name Modules linked in: sit tunnel4 nfs lockd fscache auth_rpcgss nfs_acl cryptd aes_i586 aes_generic xt_] Pid: 23386, comm: umount Tainted: P 2.6.39-wl+ #26 OEM OEM/Cantiga EIP: 0060:[<c048c294>] EFLAGS: 00010206 CPU: 0 EIP is at shmem_truncate_range+0x528/0x62f EAX: f1562000 EBX: f6740cc0 ECX: 00000000 EDX: 00000000 ESI: fffb8000 EDI: fffb9000 EBP: f1563e90 ESP: f1563e18 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process umount (pid: 23386, ti=f1562000 task=f2ca9540 task.ti=f1562000) Stack: 00000000 00000000 00000000 00000000 00000000 00000400 20080000 00003ff1 00000000 00000000 00000000 00000000 00000400 00000000 f26eea94 f6772b40 00080000 00000002 00000000 f65f5460 f6772b40 00000000 00000000 f634b280 Call Trace: [<c048c79b>] shmem_evict_inode+0x9e/0xf3 [<c04c55e5>] evict+0x5d/0xf6 [<c04c5971>] iput+0x127/0x12c [<c04c4310>] shrink_dcache_for_umount_subtree+0x174/0x19f [<c04c437d>] shrink_dcache_for_umount+0x42/0x52 [<c04b64d2>] generic_shutdown_super+0x16/0xbf [<c04b65e0>] kill_anon_super+0xc/0x43 [<c04b6630>] kill_litter_super+0x19/0x1c [<c04b6650>] deactivate_locked_super+0x1d/0x3e [<c04b6e58>] deactivate_super+0x38/0x3c [<c04c892c>] mntput_no_expire+0x10f/0x115 [<c04c929c>] sys_umount+0x281/0x2a6 [<c0785158>] sysenter_do_call+0x12/0x28 Code: 7d b0 00 75 06 83 7d bc 00 74 18 8b 45 e8 e8 5e 45 2f 00 8b 45 b4 29 43 0c 8b 45 e8 e8 fa 44 2 EIP: [<c048c294>] shmem_truncate_range+0x528/0x62f SS:ESP 0068:f1563e18 hpet1: lost 37 rtc interrupts ---[ end trace 0e823839fe4abf0f ]---
This should go upstream. Two things before I do that: 1) If possible, test vanilla 2.6.39 since upstream only wants to see vanilla. 2) May I have your kernel config file.
Maybe this is related to https://bugzilla.kernel.org/show_bug.cgi?id=35352 ? What can I do to identify the problem? I have more log messages, but they look similar to the one I provided. Also I am not able to reproduce the problem, it seems to happen randomly.
(In reply to comment #4) > Maybe this is related to https://bugzilla.kernel.org/show_bug.cgi?id=35352 ? > > What can I do to identify the problem? I have more log messages, but they look > similar to the one I provided. Also I am not able to reproduce the problem, it > seems to happen randomly. After an update to gentoo-sources-2.6.29-r1, which incorporates the fix for the linked upstream issue, I have not experienced the problem. As I said before, I was not able reproduce the error, but until the problem occures again, this issue can be closed from my perspective.
