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SubjectBUG at fs/ocfs2/extent_map.c:476
From
Hi!

Today one of my kvm hosts ran into this BUG.
The host is member of y small ocfs2-cluster (3 hosts).
CentOS 6.2, Kernel 3.1.1 (vanilla).

[8138858.899066] ------------[ cut here ]------------
[8138858.899156] kernel BUG at fs/ocfs2/extent_map.c:476!
[8138858.899232] invalid opcode: 0000 [#1] SMP
[8138858.899314] CPU 4
[8138858.899324] Modules linked in: ip6table_filter ip6_tables
iptable_filter ip_tables ebtable_nat ebtables netconsole ocfs2
ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager
ocfs2_stackglue configfs sunrpc scsi_dh_rdac bridge 8021q garp stp llc
be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb3i libcxgbi cxgb3 mdio
ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6
iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_round_robin
dm_multipath vhost_net macvtap macvlan tun kvm_intel kvm serio_raw
pcspkr i2c_i801 i2c_core iTCO_wdt iTCO_vendor_support ioatdma
i7core_edac edac_core sg ext4 mbcache jbd2 sd_mod crc_t10dif pata_acpi
ata_generic ata_piix 3w_sas igb dca dm_mod [last unloaded:
scsi_wait_scan]
[8138858.900430]
[8138858.900500] Pid: 3044, comm: qemu-kvm Not tainted 3.1.1 #1
Supermicro X8DT3/X8DT3
[8138858.900656] RIP: 0010:[<ffffffffa04f5531>] [<ffffffffa04f5531>]
ocfs2_get_clusters_nocache+0x4d1/0x520 [ocfs2]
[8138858.900836] RSP: 0018:ffff8803efa01688 EFLAGS: 00010287
[8138858.900911] RAX: 000000000000002f RBX: ffff8802ebe79030 RCX:
0000000000062114
[8138858.901048] RDX: 0000000000000300 RSI: 00000000000620ec RDI:
ffff8802ebe79320
[8138858.901183] RBP: ffff8803efa01708 R08: 0000000000062114 R09:
0000000000000000
[8138858.901322] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff8803efa01738
[8138858.901458] R13: ffff8804d6095000 R14: 0000000000000000 R15:
0000000000000001
[8138858.901595] FS: 00007fa10d5f9700(0000) GS:ffff88063fc00000(0000)
knlGS:0000000000000000
[8138858.901734] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[8138858.901809] CR2: 00000000006bdc5c CR3: 00000004cf670000 CR4:
00000000000026e0
[8138858.901942] DR0: 0000000000000001 DR1: 0000000000000002 DR2:
0000000000000001
[8138858.902075] DR3: 000000000000000a DR6: 00000000ffff0ff0 DR7:
0000000000000400
[8138858.902208] Process qemu-kvm (pid: 3044, threadinfo
ffff8803efa00000, task ffff880349986080)
[8138858.902343] Stack:
[8138858.902408] 0000000000000000 ffff880300000000 ffff8802ebe79000
ffff8803efa01754
[8138858.902556] ffff880505f9acb0 000620ec00000000 ffff8803efa01874
ffff8803efa017c4
[8138858.902706] ffff880002557130 ffffffffa04fdade ffff88062a8f2000
00000000000620ec
[8138858.902854] Call Trace:
[8138858.902945] [<ffffffffa04fdade>] ?
ocfs2_read_inode_block_full+0x3e/0x60 [ocfs2]
[8138858.903100] [<ffffffffa04f5f83>] ocfs2_get_clusters+0x1f3/0x380 [ocfs2]
[8138858.903197] [<ffffffffa04f616d>]
ocfs2_extent_map_get_blocks+0x5d/0x1a0 [ocfs2]
[8138858.903337] [<ffffffff810b1ebf>] ? __css_put+0x3f/0x90
[8138858.903429] [<ffffffffa04da6dd>] ocfs2_get_block+0xad/0x9a0 [ocfs2]
[8138858.903512] [<ffffffff8111fc79>] ? zone_statistics+0x99/0xc0
[8138858.903595] [<ffffffff81159f5c>] ? __mem_cgroup_commit_charge+0x6c/0xc0
[8138858.903679] [<ffffffff811986b2>] do_mpage_readpage+0x492/0x630
[8138858.903758] [<ffffffff8111fcd5>] ? __inc_zone_page_state+0x35/0x40
[8138858.903841] [<ffffffff811029f1>] ? add_to_page_cache_locked+0xd1/0x140
[8138858.903921] [<ffffffff811989c2>] mpage_readpages+0x102/0x160
[8138858.904015] [<ffffffffa04da630>] ?
ocfs2_map_page_blocks+0x3b0/0x3b0 [ocfs2]
[8138858.904170] [<ffffffffa04da630>] ?
ocfs2_map_page_blocks+0x3b0/0x3b0 [ocfs2]
[8138858.904331] [<ffffffffa04f37aa>] ?
ocfs2_inode_lock_full_nested+0x28a/0xad0 [ocfs2]
[8138858.904484] [<ffffffffa04d98e1>] ? ocfs2_readpages+0x41/0xe0 [ocfs2]
[8138858.904583] [<ffffffffa04d9967>] ocfs2_readpages+0xc7/0xe0 [ocfs2]
[8138858.904662] [<ffffffff8110dda2>] __do_page_cache_readahead+0x1b2/0x260
[8138858.904740] [<ffffffff8110de71>] ra_submit+0x21/0x30
[8138858.904815] [<ffffffff8110e225>] ondemand_readahead+0x115/0x240
[8138858.904894] [<ffffffff8110e3d8>] page_cache_async_readahead+0x88/0xb0
[8138858.904974] [<ffffffff811043eb>] generic_file_aio_read+0x48b/0x740
[8138858.905074] [<ffffffffa04f8f93>] ocfs2_file_aio_read+0xe3/0x380 [ocfs2]
[8138858.905155] [<ffffffff8116026a>] do_sync_read+0xda/0x120
[8138858.905233] [<ffffffff811ee9fb>] ? security_file_permission+0x8b/0x90
[8138858.905315] [<ffffffff811609b5>] vfs_read+0xc5/0x190
[8138858.905391] [<ffffffff81160b22>] sys_pread64+0xa2/0xb0
[8138858.905469] [<ffffffff814e1042>] system_call_fastpath+0x16/0x1b
[8138858.905545] Code: c0 90 56 a0 bb e2 ff ff ff 48 8b 42 28 48 8b 4a
40 48 c7 c2 78 2e 57 a0 48 89 c7 31 c0 e8 18 b1 04 00 48 8b 7d b8 e9
37 fe ff ff <0f> 0b eb fe 65 48 8b 34 25 40 c4 00 00 8b 96 8c 04 00 00
48 63
[8138858.906011] RIP [<ffffffffa04f5531>]
ocfs2_get_clusters_nocache+0x4d1/0x520 [ocfs2]
[8138858.906174] RSP <ffff8803efa01688>
[8138858.906541] ---[ end trace 5b1e50f0d8b3c799 ]---
Is this a known/fixed bug?

--
Thanks,
//richard


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