[RHEL5.6] Kernel panic in cciss_softirq_done after sg_turs with CCISS driver
Issue
- Using an updated device-mapper-multipath to enable CCISS support causes kernel crash in
cciss_softirq_done -
Kernel panics when issuing the Test Unit Ready command (sg_turs utility) on a device attached to a CCISS controller with a backtrace similar to this one:
Unable to handle kernel NULL pointer dereference at 0000000000000030 Pid: 0, comm: swapper Not tainted 2.6.18-236.el5 #1 RIP: 0010:[<ffffffff880b94fc>] [<ffffffff880b94fc>]:cciss:cciss_softirq_done+0xea/0x36d Call Trace: <IRQ> [<ffffffff880bc1c9>] :cciss:do_cciss_intr+0xaab/0xae8 [<ffffffff80037e5a>] blk_done_softirq+0x5f/0x6d [<ffffffff80012464>] __do_softirq+0x89/0x133 [<ffffffff8005e2fc>] call_softirq+0x1c/0x28 [<ffffffff8006d5f5>] do_softirq+0x2c/0x7d [<ffffffff8006d485>] do_IRQ+0xec/0xf5 Code: 8b 57 30 74 0a 89 d5 81 e5 00 fe ff ff eb 07 41 8b ad dc 00 RIP [<ffffffff880b94fc>] :cciss:cciss_softirq_done+0xea/0x36d
Environment
- Red Hat Enterprise Linux 5.6
- kernel-2.6.18-238.el5
- HP Storage connected via cciss controller
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