I don't have a comment on the actual bug here, but this is another case where it would be nice to have multi-mount protection built into ext3... When I last proposed this it was refused on the grounds that an external HA manager should be doing this job but I don't think that is realistic. Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote: > 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 > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
