Details
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Bug
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Resolution: Fixed
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Minor
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Lustre 1.8.6
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None
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lustre 1.8.3.0-6chaos
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3
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23,499
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5093
Description
A sysadmin was shutting down an MDS node cleanly in preparation for scheduled upgrades. During the umount of the MGS device, we hit the following assertion:
LustreError ... (lprocfs_status.c:1060:lprocfs_free_client_stats())
ASSERTION(atomic_read(&client_stat->nid_exp_ref_count) == 0) failed: count 1
And the stack trace was:
:obdclass:lprocfs_free_client_stats
:obdclass:lprocfs_free_per_client_stats
:mgs:lproc_mgs_cleanup
:mgs:mgs_cleanup
:obdclass:class_decref
:obdclass:class_export_destroy
:obdclass:obd_zombie_impexp_cull
:obdclass:obd_zombie_impexp_thread
We have seen this same assertion from OSTs as well. Some investigation was done in bug 23499, but there is not yet a solution.
Attachments
Activity
| Comment |
[ Hi, nice to meet you all, this is the first time to write something on the Jira ... anyway, I have a quick question on this issue. because the same problem have still occurred although I already tried to fix this bug with the patch, ｌu-39v2-master.patch. so, could you check the below case could be true or not ? If a client have mutiple NIDs and always used one NID to talk to a server until the client got a forced disconnect like request timeouts, and next, when the client try to connect the server using another NID, the server side's lprocfs_exp_setup set NULL to its exp->exp_nid_stats nevertheless nid_exp_ref_count is still equal or greater than 1. in this case, I think the server will hung in lprocfs_free_client_stats with the LASSERT statement. thank you for your cooperation. ] |
| Fix Version/s | New: Lustre 1.8.6 [ 10022 ] | |
| Fix Version/s | New: Lustre 2.1.0 [ 10021 ] | |
| Resolution | New: Fixed [ 1 ] | |
| Status | Original: Open [ 1 ] | New: Resolved [ 5 ] |
Integrated in 
reviews-centos5 #529
LU-39 ASSERTION(atomic_read(&client_stat->nid_exp_ref_count) == 0)
Bobi Jam : 8efdff9aeb1933f9b1e7320ff48ad84983e4daa3
Files :
- lustre/mgs/mgs_fs.c
- lustre/mdt/mdt_fs.c
- lustre/mdt/mdt_internal.h
- lustre/include/lprocfs_status.h
- lustre/mgs/mgs_handler.c
- lustre/obdfilter/filter.c
- lustre/obdclass/lprocfs_status.c
- lustre/mdt/mdt_handler.c
- lustre/mgs/mgs_internal.h
| Bugzilla ID | New: 23499 |
| Attachment | New: lu-39v2-master.patch [ 10100 ] |
bobi, I think we might want this patch for 2.x as well, I just made a quick look and found it's also in 2.x.
Thanks
| Affects Version/s | New: Lustre 1.8.6 [ 10022 ] | |
| Affects Version/s | Original: Lustre 1.8.x [ 10010 ] |
Integrated in
lustre-master-centos5 #159
LU-39ASSERTION(atomic_read(&client_stat->nid_exp_ref_count) == 0)Oleg Drokin : 2a6045403fbd46bb6501df907f0321f5401924ba
Files :