[lustre-discuss] Help mounting MDT

Alastair Basden a.g.basden at durham.ac.uk
Mon Oct 5 08:28:37 PDT 2020


Hi all,

We are having a problem mounting a ldiskfs mdt.  The mount command is 
hanging, with /var/log/messages containing:
Oct  5 16:26:17 c6mds1 kernel: INFO: task mount.lustre:4285 blocked for more than 120 seconds.
Oct  5 16:26:17 c6mds1 kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Oct  5 16:26:17 c6mds1 kernel: mount.lustre    D ffff92cd279de2a0     0  4285   4284 0x00000082
Oct  5 16:26:17 c6mds1 kernel: Call Trace:
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8db7f229>] schedule+0x29/0x70
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8db7cbb1>] schedule_timeout+0x221/0x2d0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d4e64a8>] ? enqueue_task_fair+0x208/0x6c0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d4dd425>] ? sched_clock_cpu+0x85/0xc0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d4d6500>] ? check_preempt_curr+0x80/0xa0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d4d6539>] ? ttwu_do_wakeup+0x19/0xe0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8db7f5dd>] wait_for_completion+0xfd/0x140
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d4da0b0>] ? wake_up_state+0x20/0x20
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0cd69d4>] llog_process_or_fork+0x244/0x450 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0cd6bf4>] llog_process+0x14/0x20 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d09eb5>] class_config_parse_llog+0x125/0x350 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0804fc0>] mgc_process_cfg_log+0x790/0xc40 [mgc]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc08084cc>] mgc_process_log+0x3dc/0x8f0 [mgc]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc080915f>] ? config_recover_log_add+0x13f/0x280 [mgc]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d120f0>] ? class_config_dump_handler+0x7e0/0x7e0 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0809b2b>] mgc_process_config+0x88b/0x13f0 [mgc]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d15d08>] lustre_process_log+0x2d8/0xad0 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0bdff97>] ? libcfs_debug_msg+0x57/0x80 [libcfs]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d00a69>] ? lprocfs_counter_add+0xf9/0x160 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d449f4>] server_start_targets+0x13a4/0x2a20 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d18d60>] ? lustre_start_mgc+0x260/0x2510 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d120f0>] ? class_config_dump_handler+0x7e0/0x7e0 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d4713c>] server_fill_super+0x10cc/0x1890 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d1ba78>] lustre_fill_super+0x328/0x950 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d1b750>] ? lustre_common_put_super+0x270/0x270 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d64c67f>] mount_nodev+0x4f/0xb0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffffc0d13b58>] lustre_mount+0x38/0x60 [obdclass]
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d64d1fe>] mount_fs+0x3e/0x1b0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d66b387>] vfs_kern_mount+0x67/0x110
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d66dadf>] do_mount+0x1ef/0xce0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d64521a>] ? __check_object_size+0x1ca/0x250
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d62368c>] ? kmem_cache_alloc_trace+0x3c/0x200
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8d66e913>] SyS_mount+0x83/0xd0
Oct  5 16:26:17 c6mds1 kernel: [<ffffffff8db8cede>] system_call_fastpath+0x25/0x2a


This is Lustre 2.12.2 on CentOS 7.6

Does anyone have any suggestions?

Cheers,
Alastair.


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