A SLES12 SP1 LTSS system may panic in d_find_any_alias()
This document (7023656) is provided subject to the disclaimer at the end of this document.
Environment
SUSE Linux Enterprise Server 12 Service Pack 1 (SLES 12 SP1)
Situation
A system with SLES12 SP1 LTSS (long term software support) and kernel 3.12.74-60.64.107-default can panic with a null pointer reference and a stack trace like:
PID: 4139 TASK: ffff8800b65cdbc0 CPU: 1 COMMAND: "nfsd"
#0 [ffff8802231c5850] machine_kexec at ffffffff8103e0bc
#1 [ffff8802231c5890] __crash_kexec at ffffffff810dbb4a
#2 [ffff8802231c5950] crash_kexec at ffffffff810dbc1d
#3 [ffff8802231c5960] oops_end at ffffffff81536f48
#4 [ffff8802231c5980] no_context at ffffffff81529fe1
#5 [ffff8802231c59c8] __do_page_fault at ffffffff81539775
#6 [ffff8802231c5ac0] page_fault at ffffffff815360d8
[exception RIP: _raw_spin_lock+0xa]
RIP: ffffffff8153589a RSP: ffff8802231c5b70 RFLAGS: 00010203
RAX: 0000000000010000 RBX: 0000000000000002 RCX: 000000000000be34
RDX: 0000000000000032 RSI: 0000000000000002 RDI: 000000000000008a
RBP: ffffffffa0375830 R8: ffff8800aea71000 R9: ffff880036b84d70
R10: 000000000000000f R11: 00000000000003ff R12: ffff8800371cc000
R13: ffffffffa05381a0 R14: 0000000000000003 R15: 0000000000000081
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#7 [ffff8802231c5b70] d_find_any_alias at ffffffff811c4006
#8 [ffff8802231c5b88] d_obtain_alias at ffffffff811c6c5a
#9 [ffff8802231c5ba8] exportfs_decode_fh at ffffffff81224a46
#10 [ffff8802231c5cf8] fh_verify at ffffffffa0376515 [nfsd]
#11 [ffff8802231c5d58] nfsd_open at ffffffffa0377c9c [nfsd]
#12 [ffff8802231c5d88] nfsd_read at ffffffffa0377e37 [nfsd]
#13 [ffff8802231c5de8] nfsd3_proc_read at ffffffffa03819c4 [nfsd]
#14 [ffff8802231c5e20] nfsd_dispatch at ffffffffa0372d40 [nfsd]
#15 [ffff8802231c5e50] svc_process_common at ffffffffa02fa0d9 [sunrpc]
#16 [ffff8802231c5ea8] svc_process at ffffffffa02fa458 [sunrpc]
#17 [ffff8802231c5ec0] nfsd at ffffffffa03726df [nfsd]
#18 [ffff8802231c5ed8] kthread at ffffffff8107ed36
#19 [ffff8802231c5f50] ret_from_fork at ffffffff8153df7b
Resolution
Engineering is currently working on a fix. If you are experiencing the panic with the same pattern please open a service request with SUSE and ask for a PTF (program temporary fix).
Cause
This is caused be a different bugfix where a return code is interpreted as a pointer to an inode.
Additional Information
Disclaimer
This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.
- Document ID:7023656
- Creation Date: 21-Jan-2019
- Modified Date:03-Mar-2020
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- SUSE Linux Enterprise Server
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