Hi,
on a Xen paravirtualized VM running a 3.3.4 I obtain a "segfault" when
doing a "btrfs subvolume delete" on a specific subvolume ; here the trace :
Apr 30 13:37:05 frozen kernel: [ 238.508387] ------------[ cut here
]------------
Apr 30 13:37:05 frozen kernel: [ 238.508402] kernel BUG at
fs/btrfs/inode.c:2951!
Apr 30 13:37:05 frozen kernel: [ 238.508409] invalid opcode: 0000 [#1] SMP
Apr 30 13:37:05 frozen kernel: [ 238.508418] CPU 1
Apr 30 13:37:05 frozen kernel: [ 238.508422] Modules linked in: ipv6
btrfs zram(C) nf_conntrack
Apr 30 13:37:05 frozen kernel: [ 238.508439]
Apr 30 13:37:05 frozen kernel: [ 238.508445] Pid: 2811, comm: btrfs
Tainted: G C 2.6.43.4-dae-xen #2
Apr 30 13:37:05 frozen kernel: [ 238.508458] RIP:
e030:[<ffffffffa004207f>] [<ffffffffa004207f>]
btrfs_unlink_subvol+0x184/0x1f9 [btrfs]
Apr 30 13:37:05 frozen kernel: [ 238.508489] RSP: e02b:ffff880268299d18
EFLAGS: 00010286
Apr 30 13:37:05 frozen kernel: [ 238.508496] RAX: 00000000ffffffe4 RBX:
ffff880268af81b0 RCX: ffff880272180e58
Apr 30 13:37:05 frozen kernel: [ 238.508504] RDX: ffff880268ace148 RSI:
0000000000000000 RDI: ffff880268ace228
Apr 30 13:37:05 frozen kernel: [ 238.508512] RBP: ffff88027055f090 R08:
0000000000014580 R09: 00000000000006cf
Apr 30 13:37:05 frozen kernel: [ 238.508520] R10: 00000000000006cf R11:
0000000000000004 R12: ffff880272037400
Apr 30 13:37:05 frozen kernel: [ 238.508528] R13: 0000000000000036 R14:
ffff880268ae6000 R15: ffff880268ad9db8
Apr 30 13:37:05 frozen kernel: [ 238.508541] FS:
00007fa83d74c760(0000) GS:ffff88027ff5f000(0000) knlGS:0000000000000000
Apr 30 13:37:05 frozen kernel: [ 238.508550] CS: e033 DS: 0000 ES:
0000 CR0: 000000008005003b
Apr 30 13:37:05 frozen kernel: [ 238.508558] CR2: 00007fa83ccbe1a0 CR3:
0000000271c10000 CR4: 0000000000002660
Apr 30 13:37:05 frozen kernel: [ 238.508566] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Apr 30 13:37:05 frozen kernel: [ 238.508575] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Apr 30 13:37:05 frozen kernel: [ 238.508583] Process btrfs (pid: 2811,
threadinfo ffff880268298000, task ffff880267d99320)
Apr 30 13:37:05 frozen kernel: [ 238.508591] Stack:
Apr 30 13:37:05 frozen kernel: [ 238.508596] ffff880268ad9db8
ffffffff0000001b ffff880268ace028 000000000000080c
Apr 30 13:37:05 frozen kernel: [ 238.508611] 0000000000000116
000000000000033a 3a00000000014bb6 8400000000000003
Apr 30 13:37:05 frozen kernel: [ 238.508626] ffffffffffffffff
0000000000000005 ffff880268ad9d80 0000000000000000
Apr 30 13:37:05 frozen kernel: [ 238.508641] Call Trace:
Apr 30 13:37:05 frozen kernel: [ 238.508662] [<ffffffffa005dcf0>] ?
btrfs_ioctl_snap_destroy+0x2df/0x3ee [btrfs]
Apr 30 13:37:05 frozen kernel: [ 238.508684] [<ffffffffa005f4e3>] ?
btrfs_ioctl+0x4fa/0xfb3 [btrfs]
Apr 30 13:37:05 frozen kernel: [ 238.508697] [<ffffffff810212ae>] ?
do_page_fault+0x270/0x2da
Apr 30 13:37:05 frozen kernel: [ 238.508707] [<ffffffff81002d5c>] ?
xen_write_msr_safe+0x73/0xb9
Apr 30 13:37:05 frozen kernel: [ 238.508716] [<ffffffff81002649>] ?
xen_end_context_switch+0xe/0x1c
Apr 30 13:37:05 frozen kernel: [ 238.508727] [<ffffffff810057cf>] ?
xen_restore_fl_direct_reloc+0x4/0x4
Apr 30 13:37:05 frozen kernel: [ 238.508737] [<ffffffff810051fc>] ?
xen_force_evtchn_callback+0x9/0xa
Apr 30 13:37:05 frozen kernel: [ 238.508748] [<ffffffff810d495f>] ?
do_vfs_ioctl+0x405/0x446
Apr 30 13:37:05 frozen kernel: [ 238.508757] [<ffffffff810051fc>] ?
xen_force_evtchn_callback+0x9/0xa
Apr 30 13:37:05 frozen kernel: [ 238.508767] [<ffffffff810057e2>] ?
check_events+0x12/0x20
Apr 30 13:37:05 frozen kernel: [ 238.508776] [<ffffffff810d49dc>] ?
sys_ioctl+0x3c/0x60
Apr 30 13:37:05 frozen kernel: [ 238.508786] [<ffffffff812ffb39>] ?
system_call_fastpath+0x16/0x1b
Apr 30 13:37:05 frozen kernel: [ 238.508793] Code: 48 89 43 c8 e8 ca 21
02 e1 4c 89 e6 4c 89 f7 48 89 53 70 48 89 53 60 48 89 da 48 89 43 68 48
89 43 58 e8 54 d9 ff ff 85 c0 74 02 <0f> 0b 48 89 ef e8 b3 f8 fd ff 31
c0 eb 05 b8 f4 ff ff ff 48 83
Apr 30 13:37:05 frozen kernel: [ 238.508915] RIP [<ffffffffa004207f>]
btrfs_unlink_subvol+0x184/0x1f9 [btrfs]
Apr 30 13:37:05 frozen kernel: [ 238.508937] RSP <ffff880268299d18>
Apr 30 13:37:05 frozen kernel: [ 238.508944] ---[ end trace
2d6ae5b9b304acdb ]---
And now I have a "frozen" (= status D) process "btrfs-transacti" (for a
different subvolume).
Is there something to do to fix that ?
Olivier
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
