[LU-4878] fld_server_lookup() ASSERTION( fld->lsf_control_exp ) failed

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Affects Version/s: Lustre 2.4.3
• Labels: mn4
• Severity: 3
• Assignee: Bruno Faccini (Inactive)
• Reporter: Gregoire Pichon

Description

The following LBUG appeared at customer site, during the mount process on all OSS in lustre 2.4.3 version.

LustreError: 12838:0:(fld_handler.c:172:fld_server_lookup()) ASSERTION(fld->lsf_control_exp ) failed:
LustreError: 12838:0:(fld_handler.c:172:fld_server_lookup()) LBUG

Pid: 12838, comm: mount.lustre

Call Trace:
 libcfs_debug_dumpstack+0x55/0x80 [libcfs]
 lbug_with_loc+0x47/0xb0 [libcfs]
 fld_server_lookup+0x2f7/0x3d0 [fld]
 osd_fld_lookup+0x71/0x1d0 [osd_ldiskfs]
 osd_remote_fid+0x9a/0x280 [osd_ldiskfs]
 osd_index_ea_lookup+0521/0x850 [osd_ldiskfs]
 dt_lookup_dir+0x6f/0x130 [obdclass]
 llog_osd_open+0x485/0xc00 [obdclass]
 llog_open+0xba/0x2c0 [obdclass]
 mgc_process_log [mgc]
 mgc_process_config [mgc]
 lustre_process_log [obdclass]
 server_start_targets [obdclass]
 server_fill_super [obdclass]
 lustre_fill_super[obdclass]
 get_sb_nodev
 lustre_get_sb
 vfs_kern_mount
 do_kern_mount
 do_mount
 sys_mount
 system_call_fastpath

This issue seems the same as LU-3126 for which a patch has been landed in lustre 2.5. Unfortunately no patch has been provided for lustre 2.4 release.

Issue Links

• is related to: LU-3126 conf-sanity test_41b: fld_server_lookup()) ASSERTION( fld->lsf_control_exp ) failed
• is related to: LU-3915 After upgrade from 2.4.0 to 2.5, can not mount OST, (osd_handler.c:2668:osd_object_ref_del()) LBUG Pid: 9537, comm: mount.lustre