[LU-1735] sanityn 18 hung

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.3.0, Lustre 2.4.0
• Affects Version/s: Lustre 2.3.0
• Environment: Single VM.
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Li Wei (Inactive)

Description

Observed this potential recursive locking of mm_sem on orion_head_sync:

Lustre: DEBUG MARKER: == sanityn test 18: mmap sanity check =================================== 10:53:49 (1344567229)
INFO: task mmap_sanity:29252 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
mmap_sanity   D 0000000000000000     0 29252  29230 0x00000080
 ffff8800095116e0 0000000000000082 ffff880011a75e40 ffff880009511668
 ffff880022934940 000000000000001d ffff880011a75300 ffff880022934940
 ffff88002f077ab8 ffff880009511fd8 000000000000fb88 ffff88002f077ab8
Call Trace:
 [<ffffffff81500185>] rwsem_down_failed_common+0x95/0x1d0
 [<ffffffff81500316>] rwsem_down_read_failed+0x26/0x30
 [<ffffffff8127e924>] call_rwsem_down_read_failed+0x14/0x30
 [<ffffffff814ff814>] ? down_read+0x24/0x30
 [<ffffffffa030e838>] cfs_get_environ+0x158/0x5f0 [libcfs]
 [<ffffffffa04dd317>] lustre_get_jobid+0x107/0x2c0 [obdclass]
 [<ffffffffa07c1f72>] ptlrpcd_add_req+0x52/0x350 [ptlrpc]
 [<ffffffffa07705db>] ? ldlm_cli_enqueue+0x1eb/0x790 [ptlrpc]
 [<ffffffffa0773aef>] ? ldlm_prep_elc_req+0x23f/0x530 [ptlrpc]
 [<ffffffffa08dd830>] ? osc_ldlm_glimpse_ast+0x0/0x170 [osc]
 [<ffffffffa08c6f96>] osc_enqueue_base+0x426/0x580 [osc]
 [<ffffffffa08dde64>] osc_lock_enqueue+0x204/0x850 [osc]
 [<ffffffffa08df100>] ? osc_lock_upcall+0x0/0x600 [osc]
 [<ffffffffa053491c>] cl_enqueue_try+0xfc/0x300 [obdclass]
 [<ffffffffa09599ea>] lov_lock_enqueue+0x23a/0x830 [lov]
 [<ffffffffa053491c>] cl_enqueue_try+0xfc/0x300 [obdclass]
 [<ffffffffa0535e1d>] cl_enqueue_locked+0x6d/0x210 [obdclass]
 [<ffffffffa0536ace>] cl_lock_request+0x7e/0x280 [obdclass]
 [<ffffffffa0c1765b>] cl_glimpse_lock+0x17b/0x4a0 [lustre]
 [<ffffffffa0c17ee7>] cl_glimpse_size0+0x187/0x190 [lustre]
 [<ffffffffa0c04040>] ll_file_mmap+0xe0/0x220 [lustre]
 [<ffffffff81145b00>] mmap_region+0x400/0x590
 [<ffffffff81145fca>] do_mmap_pgoff+0x33a/0x380
 [<ffffffff81135a00>] sys_mmap_pgoff+0x200/0x2d0
 [<ffffffff810104e9>] sys_mmap+0x29/0x30
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b