[LU-12120] LustreError: 15069:0:(tgt_grant.c:561:tgt_grant_incoming()) LBUG

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.3
• Affects Version/s: Lustre 2.10.5
• Severity: 3
• Assignee: Patrick Farrell (Inactive)
• Reporter: Mahmoud Hanafi

Description

First time we have see this lbug. We have a crash dump.

[11168227.609396] Lustre: Skipped 4149 previous similar messages
[11168546.559600] LustreError: 15069:0:(tgt_grant.c:559:tgt_grant_incoming()) nbp2-OST0121: cli 811dc111-6b22-b447-9144-bcd1173a571d/ffff881d57bff000 dirty -610055168 pend 0 grant -643806208
[11168546.609562] LustreError: 15069:0:(tgt_grant.c:561:tgt_grant_incoming()) LBUG
[11168546.631425] Pid: 15069, comm: ll_ost_io01_084 3.10.0-693.21.1.el7.20180508.x86_64.lustre2105 #1 SMP Mon Aug 27 23:04:41 UTC 2018
[11168546.631428] Call Trace:
[11168546.631439]  [<ffffffff8103a1f2>] save_stack_trace_tsk+0x22/0x40
[11168546.650223]  [<ffffffffa08597cc>] libcfs_call_trace+0x8c/0xc0 [libcfs]
[11168546.650228]  [<ffffffffa085987c>] lbug_with_loc+0x4c/0xa0 [libcfs]
[11168546.650292]  [<ffffffffa0e8c270>] tgt_grant_prepare_read+0x0/0x3b0 [ptlrpc]
[11168546.650325]  [<ffffffffa0e8c37b>] tgt_grant_prepare_read+0x10b/0x3b0 [ptlrpc]
[11168546.650335]  [<ffffffffa0c86590>] ofd_preprw+0x450/0x1170 [ofd]
[11168546.650365]  [<ffffffffa0e702a5>] tgt_brw_read+0x975/0x1860 [ptlrpc]
[11168546.650394]  [<ffffffffa0e6deca>] tgt_request_handle+0x92a/0x1370 [ptlrpc]
[11168546.650420]  [<ffffffffa0e164bb>] ptlrpc_server_handle_request+0x23b/0xaa0 [ptlrpc]
[11168546.650445]  [<ffffffffa0e1a4a2>] ptlrpc_main+0xa92/0x1e40 [ptlrpc]
[11168546.650449]  [<ffffffff810b1131>] kthread+0xd1/0xe0
[11168546.650452]  [<ffffffff816a14f7>] ret_from_fork+0x77/0xb0
[11168546.650468]  [<ffffffffffffffff>] 0xffffffffffffffff
[11168546.650469] Kernel panic - not syncing: LBUG 
 

Issue Links

• is duplicated by: LU-11939 ASSERTION( tgd->tgd_tot_granted >= ted->ted_grant ) on OSS
• is duplicated by: LU-12322 negative grant and tgt_grant.c:561:tgt_grant_incoming() LBUG
• is related to: LU-12759 parameter grant_shrink gets reset to 1 after client reconnects