panic while unloading vxio modules
Issue
While unloading vxio or other Veritas Storage Foundation Modules the server panicked with a paging request failure:
BUG: unable to handle kernel paging request at ffffeba40134fa08
The RIP in our case is common place to crash due to memory corruption:
crash> bt
PID: 0 TASK: ffff8a3fa7a14aa0 CPU: 112 COMMAND: "swapper"
#0 [ffff8980e1503ac0] machine_kexec at ffffffff81038f3b
#1 [ffff8980e1503b20] crash_kexec at ffffffff810c5b62
#2 [ffff8980e1503bf0] oops_end at ffffffff8152c430
#3 [ffff8980e1503c20] no_context at ffffffff8104a00b
#4 [ffff8980e1503c70] __bad_area_nosemaphore at ffffffff8104a295
#5 [ffff8980e1503cc0] bad_area_nosemaphore at ffffffff8104a363
#6 [ffff8980e1503cd0] __do_page_fault at ffffffff8104aabf
#7 [ffff8980e1503df0] do_page_fault at ffffffff8152e37e
#8 [ffff8980e1503e20] page_fault at ffffffff8152b735
[exception RIP: free_block+0x97]
RIP: ffffffff81170597 RSP: ffff8980e1503ed8 RFLAGS: 00010082
RAX: ffffeba40134fa08 RBX: ffff88bfa16d0440 RCX: 000000000000100f
RDX: 0000003c002c23b8 RSI: ffff89bfa6293018 RDI: 00000000584775ca
RBP: ffff8980e1503f28 R8: 0000000000000004 R9: 00000000000000c8
R10: 000000bbdf7f9455 R11: 0000000000000001 R12: 0000000000000001
R13: ffff89bfa6293018 R14: 0000000000000000 R15: ffffea0000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff8980e1503f30] do_drain at ffffffff81170e46
#10 [ffff8980e1503f60] generic_smp_call_function_interrupt at ffffffff810b33c0
#11 [ffff8980e1503fa0] smp_call_function_interrupt at ffffffff81030ef7
#12 [ffff8980e1503fb0] call_function_interrupt at ffffffff8100bdf3
--- <IRQ stack> ---
#13 [ffff8abfa7b27db8] call_function_interrupt at ffffffff8100bdf3
[exception RIP: intel_idle+0xde]
RIP: ffffffff812e134e RSP: ffff8abfa7b27e68 RFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff8abfa7b27ed8 RCX: 0000000000000000
RDX: 0000000000000da5 RSI: 0000000000000000 RDI: 0000000000354de6
RBP: ffffffff8100bdee R8: 0000000000000004 R9: 00000000000000c8
R10: 000000bbdf7f9455 R11: ffff8abfa7b27e68 R12: 0000000000000086
R13: ffff8abfa7b27dd8 R14: ffff8980e15115e0 R15: 0000000000000000
ORIG_RAX: ffffffffffffff03 CS: 0010 SS: 0018
#14 [ffff8abfa7b27ee0] cpuidle_idle_call at ffffffff814272f7
#15 [ffff8abfa7b27f00] cpu_idle at ffffffff81009fc6
Environment
o RHEL 6.5
o kernel-2.6.32-431.20.3.el6
o Veritas Storage Foundation Suite
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