[LU-3474] MDS LBUG on unlink?

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.1, Lustre 2.5.0
• Affects Version/s: Lustre 2.4.0, Lustre 2.5.0
• Labels: mn4
• Severity: 3
• Assignee: Bruno Faccini (Inactive)
• Reporter: Daire Byrne (Inactive)

Description

Hi,

We have been testing v2.4 and have hit this LBUG which we have never experienced in v1.8.x for similar workloads. It looks like it is related to do an rm/unlink on certain files. I had to abort recovery and stop the ongoing file deletion in order to keep the MDS from repeatedly crashing with the same LBUG. We can supply more debug info should you need it.

Cheers,

Daire

<0>LustreError: 6274:0:(linkea.c:169:linkea_links_find()) ASSERTION( ldata->ld_leh != ((void *)0) ) failed:
<0>LustreError: 6274:0:(linkea.c:169:linkea_links_find()) LBUG
<4>Pid: 6274, comm: mdt01_004
<4>
<4>Call Trace:
<4> [<ffffffffa044b895>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
<4> [<ffffffffa044be97>] lbug_with_loc+0x47/0xb0 [libcfs]
<4> [<ffffffffa05b47d6>] linkea_links_find+0x186/0x190 [obdclass]
<4> [<ffffffffa0b87206>] ? mdo_xattr_get+0x26/0x30 [mdd]
<4> [<ffffffffa0b8a645>] mdd_linkea_prepare+0x95/0x430 [mdd]
<4> [<ffffffffa0b8ab01>] mdd_links_rename+0x121/0x540 [mdd]
<4> [<ffffffffa0b8eae6>] mdd_unlink+0xb86/0xe30 [mdd]
<4> [<ffffffffa0e0db98>] mdo_unlink+0x18/0x50 [mdt]
<4> [<ffffffffa0e10f40>] mdt_reint_unlink+0x820/0x1010 [mdt]
<4> [<ffffffffa0e0d891>] mdt_reint_rec+0x41/0xe0 [mdt]
<4> [<ffffffffa0df2b03>] mdt_reint_internal+0x4c3/0x780 [mdt]
<4> [<ffffffffa0df2e04>] mdt_reint+0x44/0xe0 [mdt]
<4> [<ffffffffa0df7ab8>] mdt_handle_common+0x648/0x1660 [mdt]
<4> [<ffffffffa0e31165>] mds_regular_handle+0x15/0x20 [mdt]
<4> [<ffffffffa0730388>] ptlrpc_server_handle_request+0x398/0xc60 [ptlrpc]
<4> [<ffffffffa044c5de>] ? cfs_timer_arm+0xe/0x10 [libcfs]
<4> [<ffffffffa045dd8f>] ? lc_watchdog_touch+0x6f/0x170 [libcfs]
<4> [<ffffffffa07276e9>] ? ptlrpc_wait_event+0xa9/0x290 [ptlrpc]
<4> [<ffffffff81055ab3>] ? __wake_up+0x53/0x70
<4> [<ffffffffa073171e>] ptlrpc_main+0xace/0x1700 [ptlrpc]
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffff8100c0ca>] child_rip+0xa/0x20
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffff8100c0c0>] ? child_rip+0x0/0x20
<4>
<0>Kernel panic - not syncing: LBUG
<4>Pid: 6274, comm: mdt01_004 Tainted: G --------------- T 2.6.32-358.6.2.el6_lustre.g230b174.x86_64 #1
<4>Call Trace:
<4> [<ffffffff8150d878>] ? panic+0xa7/0x16f
<4> [<ffffffffa044beeb>] ? lbug_with_loc+0x9b/0xb0 [libcfs]
<4> [<ffffffffa05b47d6>] ? linkea_links_find+0x186/0x190 [obdclass]
<4> [<ffffffffa0b87206>] ? mdo_xattr_get+0x26/0x30 [mdd]
<4> [<ffffffffa0b8a645>] ? mdd_linkea_prepare+0x95/0x430 [mdd]
<4> [<ffffffffa0b8ab01>] ? mdd_links_rename+0x121/0x540 [mdd]
<4> [<ffffffffa0b8eae6>] ? mdd_unlink+0xb86/0xe30 [mdd]
<4> [<ffffffffa0e0db98>] ? mdo_unlink+0x18/0x50 [mdt]
<4> [<ffffffffa0e10f40>] ? mdt_reint_unlink+0x820/0x1010 [mdt]
<4> [<ffffffffa0e0d891>] ? mdt_reint_rec+0x41/0xe0 [mdt]
<4> [<ffffffffa0df2b03>] ? mdt_reint_internal+0x4c3/0x780 [mdt]
<4> [<ffffffffa0df2e04>] ? mdt_reint+0x44/0xe0 [mdt]
<4> [<ffffffffa0df7ab8>] ? mdt_handle_common+0x648/0x1660 [mdt]
<4> [<ffffffffa0e31165>] ? mds_regular_handle+0x15/0x20 [mdt]
<4> [<ffffffffa0730388>] ? ptlrpc_server_handle_request+0x398/0xc60 [ptlrpc]
<4> [<ffffffffa044c5de>] ? cfs_timer_arm+0xe/0x10 [libcfs]
<4> [<ffffffffa045dd8f>] ? lc_watchdog_touch+0x6f/0x170 [libcfs]
<4> [<ffffffffa07276e9>] ? ptlrpc_wait_event+0xa9/0x290 [ptlrpc]
<4> [<ffffffff81055ab3>] ? __wake_up+0x53/0x70
<4> [<ffffffffa073171e>] ? ptlrpc_main+0xace/0x1700 [ptlrpc]
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffff8100c0ca>] ? child_rip+0xa/0x20
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffffa0730c50>] ? ptlrpc_main+0x0/0x1700 [ptlrpc]
<4> [<ffffffff8100c0c0>] ? child_rip+0x0/0x20

Issue Links

• is related to: LU-5145 kernel slab data memory coruption on MDS due to a file with truncated link extended attribute