[LU-16339] bug in qmt may cause clients to hang in cl_sync_io_wait

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Severity: 3
• Assignee: Sergey Cheremencev
• Reporter: Sergey Cheremencev

Description

Bug in pool quotas that may cause write on a client to hang with following bt:

[<ffffffffc0731da5>] cl_sync_io_wait+0x1c5/0x480 [obdclass]
[<ffffffffc0732228>] cl_io_submit_sync+0x188/0x280 [obdclass]
[<ffffffffc134735e>] vvp_io_commit_sync+0x10e/0x360 [lustre]
[<ffffffffc1349a0a>] vvp_io_write_commit+0x3aa/0x5a0 [lustre]
[<ffffffffc134a28b>] vvp_io_write_start+0x68b/0xd60 [lustre]
[<ffffffffc072fe60>] cl_io_start+0x70/0x150 [obdclass]
[<ffffffffc073251f>] cl_io_loop+0x9f/0x220 [obdclass]
[<ffffffffc12edd96>] ll_file_io_generic+0x346/0xec0 [lustre]
[<ffffffffc12eef66>] ll_file_aio_write+0x656/0xa50 [lustre]
[<ffffffffc12ef471>] ll_file_write+0x111/0x1e0 [lustre]
[<ffffffffb7041320>] vfs_write+0xc0/0x1f0
[<ffffffffb704213f>] SyS_write+0x7f/0xf0
[<ffffffffb7576ddb>] system_call_fastpath+0x22/0x27
[<ffffffffffffffff>] 0xffffffffffffffff
[root@dhcppc4 tests]#