[LU-8496] Race is changelog clear path

• Type: Bug
• Resolution: Won't Do
• Priority: Minor
• Labels: patch
• Severity: 3
• Assignee: WC Triage
• Reporter: Rahul Deshmukh (Inactive)

Description

Follow error seen with the test patch which shows race in changelog clear path.

LustreError: 18671:0:(llog_osd.c:854:llog_osd_next_block()) ASSERTION( dt ) failed: 
LustreError: 18671:0:(llog_osd.c:854:llog_osd_next_block()) LBUG
Pid: 18671, comm: mdt00_001

Call Trace:
 [<ffffffffa0457875>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
 [<ffffffffa0457e77>] lbug_with_loc+0x47/0xb0 [libcfs]
 [<ffffffffa05b04f0>] llog_osd_declare_destroy+0x0/0x740 [obdclass]
 [<ffffffffa059f03e>] llog_process_thread+0x28e/0x1050 [obdclass]
 [<ffffffffa059fec8>] llog_process_or_fork+0xc8/0x490 [obdclass]
 [<ffffffffa0dc0b60>] ? llog_changelog_cancel_cb+0x0/0x1d0 [mdd]
 [<ffffffffa05a36f8>] llog_cat_process_cb+0x458/0x600 [obdclass]
 [<ffffffffa059f6aa>] llog_process_thread+0x8fa/0x1050 [obdclass]
 [<ffffffffa059fec8>] llog_process_or_fork+0xc8/0x490 [obdclass]
 [<ffffffffa05a32a0>] ? llog_cat_process_cb+0x0/0x600 [obdclass]
 [<ffffffffa05a32a0>] ? llog_cat_process_cb+0x0/0x600 [obdclass]
 [<ffffffffa05a1999>] llog_cat_process_or_fork+0x1a9/0x2f0 [obdclass]
 [<ffffffffa0dc0b60>] ? llog_changelog_cancel_cb+0x0/0x1d0 [mdd]
 [<ffffffffa0dc0b60>] ? llog_changelog_cancel_cb+0x0/0x1d0 [mdd]
 [<ffffffffa0463021>] ? libcfs_debug_msg+0x41/0x50 [libcfs]
 [<ffffffffa05a1b6e>] llog_cat_process+0x2e/0x30 [obdclass]
 [<ffffffffa0dc098f>] llog_changelog_cancel+0x5f/0x230 [mdd]
 [<ffffffffa0dc4be5>] ? mdd_changelog_write_header+0x3a5/0x4d0 [mdd]
 [<ffffffffa05a5d88>] llog_cancel+0x58/0x230 [obdclass]
 [<ffffffffa0dc6d02>] mdd_changelog_user_purge+0x472/0x770 [mdd]
 [<ffffffffa0dc71ca>] mdd_iocontrol+0x1ca/0xaf0 [mdd]
 [<ffffffffa0e2d8b9>] mdt_ioc_child+0x149/0x1d0 [mdt]

Issue Links

• is related to: LU-6699 LustreError: 7605:0:(osd_handler.c:2530:osd_object_destroy()) ASSERTION