I accidentally ran two qemu instances on the same ext3 fs, after that bad
things happened. After exiting the two qemus and running a new one, I got the
following oops:
root ~# ll /etc/mtab
/bin/ls: /etc/mtab: Input/output error
root ~# rm /etc/mtab
[ 147.213090] EXT3-fs warning (device hda): ext3_unlink: Deleting nonexistent file (1775838), 0
root ~# halt
[ 152.651209] list_add corruption. next->prev should be prev (ffff810007be1a38), but was ffff81000717e3d8. (next=ffff81000717e3d8).
[ 152.652507] ------------[ cut here ]------------
[ 152.652900] kernel BUG at lib/list_debug.c:27!
[ 152.653283] invalid opcode: 0000 [1] SMP
[ 152.653649] last sysfs file: /block/md2/uevent
[ 152.654020] CPU 0
[ 152.654228] Modules linked in:
[ 152.654549] Pid: 1107, comm: zsh Not tainted 2.6.20-rc6-mm3 #1
[ 152.655397] RIP: 0010:[<ffffffff8116f558>] [<ffffffff8116f558>] __list_add+0x48/0xb0
[ 152.656139] RSP: 0018:ffff8100062bdd78 EFLAGS: 00000296
[ 152.656572] RAX: 0000000000000088 RBX: ffff81000717e3d8 RCX: 0000000000000000
[ 152.657140] RDX: ffffffff8101a433 RSI: 0000000000000001 RDI: ffffffff8141fb40
[ 152.657708] RBP: ffff8100062bdd98 R08: 0000000000000002 R09: ffffffff8101a270
[ 152.658275] R10: ffff8100062bdb58 R11: 0000000000000006 R12: ffff810007be1a38
[ 152.658842] R13: ffff81000717e3d8 R14: ffff810005a52170 R15: ffff81000717e3d8
[ 152.659415] FS: 00002ba30c98ae90(0000) GS:ffffffff81488000(0000) knlGS:0000000000000000
[ 152.660068] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 152.660531] CR2: 00002ba30d670000 CR3: 00000000062ee000 CR4: 00000000000006e0
[ 152.661103] Process zsh (pid: 1107, threadinfo ffff8100062bc000, task ffff810007895080)
[ 152.661731] Stack: ffff8100061245b0 0000000000000000 ffff810007bcac20 ffff81000717e470
[ 152.662483] ffff8100062bdda8 ffffffff8116f5cc ffff8100062bde18 ffffffff81129463
[ 152.663147] ffff81000717e470 ffff81000717e300 ffff8100061245b0 0000000000000f80
[ 152.663779] Call Trace:
[ 152.664035] [<ffffffff8116f5cc>] list_add+0xc/0x10
[ 152.664439] [<ffffffff81129463>] ext3_orphan_add+0x163/0x1a0
[ 152.664943] [<ffffffff8112a5c0>] ext3_unlink+0x150/0x1c0
[ 152.665385] [<ffffffff81056942>] vfs_unlink+0xb2/0x110
[ 152.665813] [<ffffffff81045e58>] do_unlinkat+0x108/0x1f0
[ 152.666255] [<ffffffff81073341>] trace_hardirqs_on_thunk+0x35/0x37
[ 152.666761] [<ffffffff810b2749>] trace_hardirqs_on+0x1a9/0x1d0
[ 152.667239] [<ffffffff81073341>] trace_hardirqs_on_thunk+0x35/0x37
[ 152.667758] [<ffffffff810ee891>] sys_unlink+0x11/0x20
[ 152.668180] [<ffffffff8106c11e>] system_call+0x7e/0x83
[ 152.668602]
[ 152.668749]
[ 152.668754] Code: 0f 0b 66 66 90 66 66 90 eb fe 31 f6 49 3b 1c 24 48 c7 c7 60
[ 152.669850] RIP [<ffffffff8116f558>] __list_add+0x48/0xb0
[ 152.670322] RSP <ffff8100062bdd78>
[ 152.670842] BUG: at kernel/exit.c:860 do_exit()
[ 152.671209]
[ 152.671214] Call Trace:
[ 152.671543] [<ffffffff8109a835>] profile_task_exit+0x15/0x20
[ 152.671992] [<ffffffff81017f7b>] do_exit+0x6b/0xac0
[ 152.672384] [<ffffffff81073d6c>] _spin_unlock_irqrestore+0x4c/0x60
[ 152.672871] [<ffffffff8107b7b1>] die+0x61/0x70
[ 152.673230] [<ffffffff81074b00>] do_trap+0xf0/0x110
[ 152.673624] [<ffffffff8107be63>] do_invalid_op+0xb3/0xc0
[ 152.674048] [<ffffffff8116f558>] __list_add+0x48/0xb0
[ 152.675955] [<ffffffff8107439d>] error_exit+0x0/0x96
[ 152.676385] [<ffffffff8101a270>] release_console_sem+0x50/0x230
[ 152.676876] [<ffffffff8101a433>] release_console_sem+0x213/0x230
[ 152.677370] [<ffffffff8116f558>] __list_add+0x48/0xb0
[ 152.677777] [<ffffffff8116f558>] __list_add+0x48/0xb0
[ 152.678200] [<ffffffff8116f5cc>] list_add+0xc/0x10
[ 152.678598] [<ffffffff81129463>] ext3_orphan_add+0x163/0x1a0
[ 152.679105] [<ffffffff8112a5c0>] ext3_unlink+0x150/0x1c0
[ 152.679570] [<ffffffff81056942>] vfs_unlink+0xb2/0x110
[ 152.679991] [<ffffffff81045e58>] do_unlinkat+0x108/0x1f0
[ 152.680436] [<ffffffff81073341>] trace_hardirqs_on_thunk+0x35/0x37
[ 152.680945] [<ffffffff810b2749>] trace_hardirqs_on+0x1a9/0x1d0
[ 152.681411] [<ffffffff81073341>] trace_hardirqs_on_thunk+0x35/0x37
[ 152.681909] [<ffffffff810ee891>] sys_unlink+0x11/0x20
[ 152.682341] [<ffffffff8106c11e>] system_call+0x7e/0x83
[ 152.682761]
Regards,
Wu