GPFS deadman timeout triggered panic after FC transport disruption

Solution Verified - Updated -


System panic after an FC transport disruption followed by Qlogic aborts and finally a GPFS deadman timeout
with I/O in-flight :

Jan 13 11:44:02 somehost kernel: qla2xxx 0000:0e:00.1: scsi(1:0:3): Abort command issued -- 1 de805db 2002.
Jan 13 11:44:03 somehost kernel: qla2xxx 0000:0e:00.1: scsi(1:0:3): Abort command issued -- 1 de805dc 2002.
Jan 13 11:44:47 somehost kernel: GPFS Deadman Switch timer [0] has expired; IOs in progress: 1

The vmcore analysis shows the GFS deadman timer induced the panic :

      KERNEL: usr/lib/debug/lib/modules/2.6.18-194.17.1.el5/vmlinux
    DUMPFILE: some_vmcore  [PARTIAL DUMP]
        CPUS: 16
        DATE: Fri Jan 13 05:44:12 2012
      UPTIME: 92 days, 03:48:27
LOAD AVERAGE: 20.35, 12.70, 10.75
       TASKS: 1748
    NODENAME: somehost
     RELEASE: 2.6.18-194.17.1.el5
     VERSION: #1 SMP Mon Sep 20 07:12:06 EDT 2010
     MACHINE: x86_64  (2399 Mhz)
      MEMORY: 47.3 GB
       PANIC: "Kernel panic - not syncing: GPFS Deadman Switch timer has expired, and there are still 1 outstanding I/O requests"
         PID: 0
     COMMAND: "swapper"
        TASK: ffff810c1ff387a0  (1 of 16)  [THREAD_INFO: ffff81061fc16000]
         CPU: 3

crash> bt
PID: 0      TASK: ffff810c1ff387a0  CPU: 3   COMMAND: "swapper"
 #0 [ffff81061fc1fd38] crash_kexec at ffffffff800ad9ce
 #1 [ffff81061fc1fdf8] panic at ffffffff80091a58
 #2 [ffff81061fc1fee8] cxiDMSExpired at ffffffff8859dfdf [mmfslinux]
 #3 [ffff81061fc1ff08] run_timer_softirq at ffffffff80097aa6
 #4 [ffff81061fc1ff58] __do_softirq at ffffffff80012443
 #5 [ffff81061fc1ff88] call_softirq at ffffffff8005e2fc
 #6 [ffff81061fc1ffa0] do_softirq at ffffffff8006cb8a
 #7 [ffff81061fc1ffb0] apic_timer_interrupt at ffffffff8005dc8e
--- <IRQ stack> ---
 #8 [ffff81061fc17e08] apic_timer_interrupt at ffffffff8005dc8e
    [exception RIP: acpi_processor_idle_simple+0x17d]
    RIP: ffffffff8019d581  RSP: ffff81061fc17eb8  RFLAGS: 00000287
    RAX: ffff81061fc17fd8  RBX: 00000000005b6338  RCX: 0000000000000908
    RDX: 0000000000000908  RSI: 0000000000000003  RDI: 0000000000000000
    RBP: 0000000300000000   R8: ffff81061fc16000   R9: 0000000000000034
    R10: ffff8106350ead90  R11: ffff810700ee5c80  R12: ffffffff80062ff8
    R13: ffff81061fc17ee8  R14: ffff81052c0c5500  R15: 0000000010008040
    ORIG_RAX: ffffffffffffff10  CS: 0010  SS: 0018
 #9 [ffff81061fc17eb0] acpi_processor_idle_simple at ffffffff8019d470
#10 [ffff81061fc17ef0] cpu_idle at ffffffff8004923a


  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • GPFS (third party)
  • Qlogic HBAs with external storage
  • lpfc HBA

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