[lustre-discuss] [EXTERNAL] MDT mount stuck

[Thomas Roth]

Hi Rick,
I have not tried that yet - after some forty minutes the mount command returned, the device is mounted. I will check how it behaves after all OSTs 
have been mounted.

Regards
Thomas

On 12.03.21 00:05, Mohr, Rick wrote:
> Thomas,
> 
> Is the behavior any different if you mount with the "-o abort_recov" option to avoid the recovery phase?
> 
> --Rick
> 
> On 3/11/21, 11:48 AM, "lustre-discuss on behalf of Thomas Roth via lustre-discuss" <lustre-discuss-bounces at lists.lustre.org on behalf of lustre-discuss at lists.lustre.org> wrote:
> 
>      Hi all,
> 
>      after not getting out of the ldlm_lockd - situation, we are trying a shutdown plus restart.
>      Does not work at all, the very first mount of the restart is MGS + MDT0, of course.
> 
>      It is quite busy writing traces to the log
> 
> 
>      Mar 11 17:21:17 lxmds19.gsi.de kernel: INFO: task mount.lustre:2948 blocked for more than 120 seconds.
>      Mar 11 17:21:17 lxmds19.gsi.de kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
>      this message.
>      Mar 11 17:21:17 lxmds19.gsi.de kernel: mount.lustre    D ffff9616ffc5acc0     0  2948   2947 0x00000082
>      Mar 11 17:21:17 lxmds19.gsi.de kernel: Call Trace:
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a785da9>] schedule+0x29/0x70
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a7838b1>] schedule_timeout+0x221/0x2d0
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a0e17f6>] ? select_task_rq_fair+0x5a6/0x760
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a78615d>] wait_for_completion+0xfd/0x140
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a0db990>] ? wake_up_state+0x20/0x20
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0b7c9a4>] llog_process_or_fork+0x244/0x450 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0b7cbc4>] llog_process+0x14/0x20 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bafd05>] class_config_parse_llog+0x125/0x350
>      [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc077efc0>] mgc_process_cfg_log+0x790/0xc40 [mgc]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc07824cc>] mgc_process_log+0x3dc/0x8f0 [mgc]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc078315f>] ? config_recover_log_add+0x13f/0x280 [mgc]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bb7f40>] ? class_config_dump_handler+0x7e0/0x7e0
>      [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0783b2b>] mgc_process_config+0x88b/0x13f0 [mgc]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bbbb58>] lustre_process_log+0x2d8/0xad0 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0a84177>] ? libcfs_debug_msg+0x57/0x80 [libcfs]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0ba68b9>] ? lprocfs_counter_add+0xf9/0x160 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bea8f4>] server_start_targets+0x13a4/0x2a20 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bbebb0>] ? lustre_start_mgc+0x260/0x2510 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bb7f40>] ? class_config_dump_handler+0x7e0/0x7e0
>      [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bed03c>] server_fill_super+0x10cc/0x1890 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bc1a08>] lustre_fill_super+0x468/0x960 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bc15a0>] ? lustre_common_put_super+0x270/0x270
>      [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a2510ff>] mount_nodev+0x4f/0xb0
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffffc0bb99a8>] lustre_mount+0x38/0x60 [obdclass]
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a251c7e>] mount_fs+0x3e/0x1b0
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a2707d7>] vfs_kern_mount+0x67/0x110
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a272f0f>] do_mount+0x1ef/0xd00
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a249daa>] ? __check_object_size+0x1ca/0x250
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a2288ec>] ? kmem_cache_alloc_trace+0x3c/0x200
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a273d63>] SyS_mount+0x83/0xd0
>      Mar 11 17:21:17 lxmds19.gsi.de kernel:  [<ffffffff8a792ed2>] system_call_fastpath+0x25/0x2a
> 
> 
> 
> 
>      Other than that, nothing is happening.
> 
>      The Lustre processes have started, but e.g. recovery_status = Inactive.
>      OK, perhaps because there is nothing out there to recover besides this MDS, all other Lustre
>      servers+clients are still stopped.
> 
> 
>      Still, on previous occasions the mount would not block in this way. The device would be mounted - now
>      it does not make it into /proc/mounts
> 
>      Btw, the disk device can be mounted as type ldiskfs. So it exists, and it looks definitely like a
>      Lustre MDT on the inside.
> 
> 
>      Best,
>      Thomas
> 
>      --
>      --------------------------------------------------------------------
>      Thomas Roth
>      Department: Informationstechnologie
>      Location: SB3 2.291
>      Phone: +49-6159-71 1453  Fax: +49-6159-71 2986
> 
> 
>      GSI Helmholtzzentrum für Schwerionenforschung GmbH
>      Planckstraße 1, 64291 Darmstadt, Germany, www.gsi.de
> 
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> 
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-- 
--------------------------------------------------------------------
Thomas Roth
Department: IT
Location: SB3 2.291
Phone: +49-6159-71 1453  Fax: +49-6159-71 2986

GSI Helmholtzzentrum für Schwerionenforschung GmbH
Planckstraße 1, 64291 Darmstadt, Germany, www.gsi.de

Commercial Register / Handelsregister: Amtsgericht Darmstadt, HRB 1528
Managing Directors / Geschäftsführung:
Professor Dr. Paolo Giubellino, Dr. Ulrich Breuer, Jörg Blaurock
Chairman of the Supervisory Board / Vorsitzender des GSI-Aufsichtsrats:
State Secretary / Staatssekretär Dr. Volkmar Dietz