[LU-9428] ASSERTION( de->d_op == &ll_d_ops)

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Affects Version/s: Lustre 2.7.0
• Environment: RHEL6 server
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Frederik Ferner (Inactive)

Description

We have recently seen frequent occurrences of the LBUG below.

The affected machines are all exporting our Lustre file system via NFS to other Linux machines.

May  2 06:59:03 i05-storage1 kernel: LustreError: 3023:0:(dcache.c:236:ll_d_init()) ASSERTION( de->d_op == &ll_d_ops ) failed: 
May  2 06:59:03 i05-storage1 kernel: LustreError: 3023:0:(dcache.c:236:ll_d_init()) LBUG
May  2 06:59:03 i05-storage1 kernel: Pid: 3023, comm: nfsd
May  2 06:59:03 i05-storage1 kernel: 
May  2 06:59:03 i05-storage1 kernel: Call Trace:
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0383895>] libcfs_debug_dumpstack+0x55/0x80 [libcfs]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0383e97>] lbug_with_loc+0x47/0xb0 [libcfs]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa097e69f>] ll_d_init+0x2ff/0x540 [lustre]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa09c1b5b>] ll_iget_for_nfs+0x20b/0x300 [lustre]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa09c1d89>] ll_fh_to_dentry+0x99/0xa0 [lustre]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0b3871c>] exportfs_decode_fh+0x5c/0x2bc [exportfs]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bcc8e0>] ? nfsd_acceptable+0x0/0x120 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0b56da0>] ? cache_check+0x60/0x370 [sunrpc]
May  2 06:59:03 i05-storage1 kernel: [<ffffffff8117f76b>] ? cache_alloc_refill+0x15b/0x240
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bccdda>] fh_verify+0x32a/0x640 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bcfda1>] nfsd_open+0x31/0x240 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bd022b>] nfsd_commit+0x3b/0xa0 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffff810aff24>] ? groups_free+0x54/0x60
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bd769d>] nfsd3_proc_commit+0x9d/0x100 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bc9405>] nfsd_dispatch+0xe5/0x230 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0b4ccf4>] svc_process_common+0x344/0x640 [sunrpc]
May  2 06:59:03 i05-storage1 kernel: [<ffffffff8106c500>] ? default_wake_function+0x0/0x20
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0b4d390>] svc_process+0x110/0x160 [sunrpc]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bc9c82>] nfsd+0xc2/0x160 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffffa0bc9bc0>] ? nfsd+0x0/0x160 [nfsd]
May  2 06:59:03 i05-storage1 kernel: [<ffffffff810a640e>] kthread+0x9e/0xc0
May  2 06:59:03 i05-storage1 kernel: [<ffffffff8100c28a>] child_rip+0xa/0x20
May  2 06:59:03 i05-storage1 kernel: [<ffffffff810a6370>] ? kthread+0x0/0xc0
May  2 06:59:03 i05-storage1 kernel: [<ffffffff8100c280>] ? child_rip+0x0/0x20
May  2 06:59:03 i05-storage1 kernel: 

This looks similar to LU-9241 but the stack trace is not quite the same and also the patch is against master while we are running b2_7_fe, so would need a fix for that.

We are still investigating the events leading to the crash, hoping for a reproducer....

Issue Links

• duplicates: LU-9421 minor improvement on the implementation of libcfs crypto framework