[Lustre-discuss] Oops: Lustre mount of MDS causes kernel panic in mds_free_client

[Dave Johnson]

Our lustre filesystem is unable to run because the MDS host
crashes immediately while mounting the metadata file system.
It is accessing an invalid address (deadbeef) in the routine
mds_free_client.  The Lustre version is 1.6.0.1.  Copying the
crash log from the console by hand (lost the password to the
management processors so we can't do serial console anymore):

mount.lustre  Cannot handle kernel paging request mds_client_free+612
Trace:
mds_destroy_export
obdclass:class_export_destroy
obdclass:obd_zombie_impexp_call
obdclass:class_detach
obdclass:class_process_config
obdclass:class_manual_cleanup
obdclass:lustre_fill_super

I found messages in the mailing list about removing CATALOGS and OBJECTS/*
and mounting using -o abort_recov.  I tried these things, in addition to
removing PENDING/* (all empty files).  This last crash trace was done
(accidentally) without the -o abort_recov mount option, but the outcome
did not improve on the earlier attempts.  

Any help in this would be greatly appreciated.

Thanks,

 -- ddj

Dave Johnson
Brown University CCV