[LU-6602] ASSERTION( rec->lrh_len <= 8192 ) failed

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.8.0
• Labels: dne2
• Severity: 3
• Assignee: Di Wang
• Reporter: Robert Read (Inactive)

Description

  Testing this build: https://build.hpdd.intel.com/job/lustre-reviews/32021/

In AWS environment with 64 MDTs (8 MDS * 8 MDT each).

1. cd /mnt/lustre
2. lfs mkdir -c 8 8stripedir
3. lfs mkdir -c 64 64stripedir
   <hang>
   On MDS0

   LustreError: 1291:0:(llog_cat.c:319:llog_cat_add_rec()) ASSERTION( rec->lrh_len <= 8192 ) failed: 
   LustreError: 1291:0:(llog_cat.c:319:llog_cat_add_rec()) LBUG
   Pid: 1291, comm: mdt00_002
   
   Call Trace:
    [<ffffffffa00f2875>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
    [<ffffffffa00f2e77>] lbug_with_loc+0x47/0xb0 [libcfs]
    [<ffffffffa0207848>] llog_cat_add_rec+0x3e8/0x450 [obdclass]
    [<ffffffffa01ff039>] llog_add+0x89/0x1c0 [obdclass]
    [<ffffffffa187b6f4>] sub_updates_write+0x154/0x600 [ptlrpc]
    [<ffffffffa187c247>] top_trans_stop+0x6a7/0xb40 [ptlrpc]
    [<ffffffffa1d8cd21>] lod_trans_stop+0x61/0x70 [lod]
    [<ffffffffa1e3149a>] mdd_trans_stop+0x1a/0xac [mdd]
    [<ffffffffa1e20909>] mdd_create+0x13a9/0x1750 [mdd]
    [<ffffffffa1cdb65c>] ? mdt_version_save+0x8c/0x1a0 [mdt]
    [<ffffffffa1cdf9ec>] mdt_reint_create+0xbbc/0xcc0 [mdt]
    [<ffffffffa1cdab1d>] mdt_reint_rec+0x5d/0x200 [mdt]
    [<ffffffffa1cbffcb>] mdt_reint_internal+0x4cb/0x7a0 [mdt]
    [<ffffffffa1cc073b>] mdt_reint+0x6b/0x120 [mdt]
    [<ffffffffa1868e8e>] tgt_request_handle+0x8be/0xfe0 [ptlrpc]
    [<ffffffffa1818aa1>] ptlrpc_main+0xe41/0x1970 [ptlrpc]
    [<ffffffff81060c3f>] ? finish_task_switch+0x4f/0xf0
    [<ffffffffa1817c60>] ? ptlrpc_main+0x0/0x1970 [ptlrpc]
    [<ffffffff8109e71e>] kthread+0x9e/0xc0
    [<ffffffff8100c20a>] child_rip+0xa/0x20
    [<ffffffff8100b294>] ? int_ret_from_sys_call+0x7/0x1b
    [<ffffffff8100ba1d>] ? retint_restore_args+0x5/0x6
    [<ffffffff8100c200>] ? child_rip+0x0/0x20
   
   Kernel panic - not syncing: LBUG
   Pid: 1291, comm: mdt00_002 Not tainted 2.6.32-504.16.2.el6_lustre.gd805a88.x86_64 #1
   Call Trace:
    [<ffffffff81529fbc>] ? panic+0xa7/0x16f
    [<ffffffffa00f2ecb>] ? lbug_with_loc+0x9b/0xb0 [libcfs]
    [<ffffffffa0207848>] ? llog_cat_add_rec+0x3e8/0x450 [obdclass]
    [<ffffffffa01ff039>] ? llog_add+0x89/0x1c0 [obdclass]
    [<ffffffffa187b6f4>] ? sub_updates_write+0x154/0x600 [ptlrpc]
    [<ffffffffa187c247>] ? top_trans_stop+0x6a7/0xb40 [ptlrpc]
    [<ffffffffa1d8cd21>] ? lod_trans_stop+0x61/0x70 [lod]
    [<ffffffffa1e3149a>] ? mdd_trans_stop+0x1a/0xac [mdd]
    [<ffffffffa1e20909>] ? mdd_create+0x13a9/0x1750 [mdd]
    [<ffffffffa1cdb65c>] ? mdt_version_save+0x8c/0x1a0 [mdt]
    [<ffffffffa1cdf9ec>] ? mdt_reint_create+0xbbc/0xcc0 [mdt]
    [<ffffffffa1cdab1d>] ? mdt_reint_rec+0x5d/0x200 [mdt]
    [<ffffffffa1cbffcb>] ? mdt_reint_internal+0x4cb/0x7a0 [mdt]
    [<ffffffffa1cc073b>] ? mdt_reint+0x6b/0x120 [mdt]
    [<ffffffffa1868e8e>] ? tgt_request_handle+0x8be/0xfe0 [ptlrpc]
    [<ffffffffa1818aa1>] ? ptlrpc_main+0xe41/0x1970 [ptlrpc]
    [<ffffffff81060c3f>] ? finish_task_switch+0x4f/0xf0
    [<ffffffffa1817c60>] ? ptlrpc_main+0x0/0x1970 [ptlrpc]
    [<ffffffff8109e71e>] ? kthread+0x9e/0xc0
    [<ffffffff8100c20a>] ? child_rip+0xa/0x20
    [<ffffffff8100b294>] ? int_ret_from_sys_call+0x7/0x1b
    [<ffffffff8100ba1d>] ? retint_restore_args+0x5/0x6
    [<ffffffff8100c200>] ? child_rip+0x0/0x20
   

After each reboot/recovery cycle the MDS would LBUG again with same error right after recovery completed. Presumably the client was resending the mkdir. Once I killed lfs, the crashes stopped.

Issue Links

• is blocking: LU-6737 many stripe testing of DNE2
• is related to: LU-6831 The ticket for tracking all DNE2 bugs
• is related to: LU-7666 llog_cat_new_log() should use chunk size when freeing header