Hi,
We ran into the following problem:
[ 194.789476] libceph: loaded (mon/osd proto 15/24, osdmap 5/6 5/6)
[ 194.798526] ceph: loaded (mds proto 32)
[ 194.800431] libceph: client0 fsid
97e515bb-d334-4fa7-8b53-7d85615809fd
[ 194.802534] libceph: mon0 10.255.0.25:6789 session established
[ 338.004303] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 338.005461] IP: [<ffffffffa025d0c2>] ceph_d_prune+0x22/0x30 [ceph]
[ 338.006277] PGD 1378e8067 PUD 13726e067 PMD 0
[ 338.006918] Oops: 0002 [#1] SMP
[ 338.007386] CPU 0
[ 338.007648] Modules linked in: ceph libceph libcrc32c
ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables
x_tables openvswitch(O) kvm_intel kvm nbd ib_iser rdma_cm ib_cm iw_cm
ib_sa ib
_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi
scsi_transport_iscsi vesafb joydev i7core_edac mac_hid psmouse
dm_multipath edac_core shpchp lp serio_raw parport usbhid hid e1000e
[ 338.013103]
[ 338.013300] Pid: 5461, comm: umount Tainted: G O
3.2.0-44-generic #69-Ubuntu Supermicro X8SIU/X8SIU
[ 338.014634] RIP: 0010:[<ffffffffa025d0c2>] [<ffffffffa025d0c2>]
ceph_d_prune+0x22/0x30 [ceph]
[ 338.015318] RSP: 0018:ffff88013822be08 EFLAGS: 00010286
[ 338.015616] RAX: 0000000000000000 RBX: ffff8801214d7cc0 RCX:
0000000100002529
[ 338.016524] RDX: ffffffff81c31c00 RSI: ffffffff8118f220 RDI:
ffff8801214d7cc0
[ 338.017438] RBP: ffff88013822be08 R08: 0000000000000001 R09:
0000000000000000
[ 338.018350] R10: 0000000000000000 R11: 0000000000000001 R12:
ffff8801214d7d40
[ 338.019247] R13: 00000000018347f0 R14: 0000000000000000 R15:
0000000000000000
[ 338.020200] FS: 00007f17b5770800(0000) GS:ffff88013fc00000(0000)
knlGS:0000000000000000
[ 338.021240] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 338.021978] CR2: 0000000000000000 CR3: 0000000137881000 CR4:
00000000000006f0
[ 338.022893] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 338.023809] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 338.024723] Process umount (pid: 5461, threadinfo ffff88013822a000,
task ffff88013417ae00)
[ 338.025802] Stack:
[ 338.026066] ffff88013822be28 ffffffff8118e8e7 ffff8801214d7cc0
ffff8801214d7cc0
[ 338.027112] ffff88013822be58 ffffffff8118f89a ffff88013822be18
ffff88013822be18
[ 338.028162] ffff8801340fd400 ffffffffa02730e0 ffff88013822be78
ffffffff811918a9
[ 338.029209] Call Trace:
[ 338.029539] [<ffffffff8118e8e7>] dentry_lru_prune+0x87/0x90
[ 338.030275] [<ffffffff8118f89a>]
shrink_dcache_for_umount_subtree+0x7a/0x1e0
[ 338.031187] [<ffffffff811918a9>] shrink_dcache_for_umount+0x49/0x60
[ 338.031785] [<ffffffff8117bc8c>] generic_shutdown_super+0x2c/0xe0
[ 338.032145] [<ffffffff8117bdd6>] kill_anon_super+0x16/0x30
[ 338.032807] [<ffffffffa02590c0>] ceph_kill_sb+0x30/0x50 [ceph]
[ 338.033573] [<ffffffff8117c41c>] deactivate_locked_super+0x3c/0xa0
[ 338.034379] [<ffffffff8117cc9e>] deactivate_super+0x4e/0x70
[ 338.035116] [<ffffffff8119945d>] mntput_no_expire+0x9d/0xf0
[ 338.035832] [<ffffffff8119a78b>] sys_umount+0x5b/0xd0
[ 338.036493] [<ffffffff81667cc2>] system_call_fastpath+0x16/0x1b
[ 338.037267] Code: 66 90 b8 01 00 00 00 5d c3 55 48 89 e5 66 66 66 66
90 48 8b 47 18 48 85 c0 74 14 48 39 c7 74 0f 48 83 7f 10 00 74 08 48 8b
40 78 <f0> 80 20 fd 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 48
83 ec
[ 338.041328] RIP [<ffffffffa025d0c2>] ceph_d_prune+0x22/0x30 [ceph]
[ 338.042165] RSP <ffff88013822be08>
[ 338.042613] CR2: 0000000000000000
[ 338.043140] ---[ end trace 17d0a061021b6835 ]---
I can see that there is an old bug report here:
http://tracker.ceph.com/issues/3088
and perhaps
http://tracker.ceph.com/issues/2444
We are running 0.61.3 on Ubuntu 12.04
Kernel:
root@xxx:~# uname -a
Linux xxxx 3.2.0-44-generic #69-Ubuntu SMP Thu May 16 17:35:01 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
The machine needs a reboot in order to mount cephfs again. We can
easily reproduce this if needed.
Thanks,
Peter
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