SLES11SP2 panics on reboot after shutting down Oracle services

This document (7010465) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 11 Service Pack 2

Situation

oracleasm-2.0.5-7.24.59
oracleasm-kmp-default-2.0.5_3.0.13_0.27-7.24.59

Upon shutdown or reboot, the system panics shortly after shutting down the Oracle database and the system shutdown hangs. The following kernel trace is written to the system log:

slab error in kmem_cache_destroy(): cache `asmdisk_cache': Can't free all
objects
Pid: 7997, comm: modprobe Tainted: G            X 3.0.26-0.7-default #1
Call Trace:
 [<ffffffff810048b5>] dump_trace+0x75/0x300
 [<ffffffff814401af>] dump_stack+0x69/0x6f
 [<ffffffff8113e0b8>] kmem_cache_destroy+0xd8/0x120
 [<ffffffffa02319ca>] exit_asmfs_fs+0x1a/0x650 [oracleasm]
 [<ffffffff8109775e>] sys_delete_module+0x17e/0x270
 [<ffffffff8144af92>] system_call_fastpath+0x16/0x1b
DWARF2 unwinder stuck at system_call_fastpath+0x16/0x1b

Resolution

Please update to oracleasm-2.0.5-7.26.3 and oracleasm-kmp-default 2.0.5-7.26.3 or later.

Cause

While unloading the oracleasm module asmfs is still in the list of superblocks but no longer available in memory causing the system to crash while trying to access the callback functions in the superblock.

Additional Information

This issue can be reproduced by unloading the oracleasm module (rmmod oracleasm). The crash will occur a few seconds after the module got unloaded.

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.