Process "perfwatch" crashes a Xen Dom0

Solution Verified - Updated -

Issue

Server crashes without any trace. The captured VMcore shows a process perfwatch that seems to have caused the crash:

crash> bt
PID: 11494  TASK: ffff88001a8337e0  CPU: 0   COMMAND: "perfwatch"
 #0 [ffff880016a87e08] schedule at ffffffff80262d67
 #1 [ffff880016a87e20] xen_pgd_unpin at ffffffff8027f4ea
 #2 [ffff880016a87e50] mm_unpin at ffffffff8027db99
 #3 [ffff880016a87e60] _arch_exit_mmap at ffffffff8027df8b
 #4 [ffff880016a87ed0] exit_mmap at ffffffff8023b2c1
 #5 [ffff880016a87f00] mmput at ffffffff8023d9d1
 #6 [ffff880016a87f20] do_exit at ffffffff80215f6c
 #7 [ffff880016a87f80] tracesys at ffffffff802602f9 (via system_call)
    RIP: 000000368de9a4bf  RSP: 00007fff8a8a5a68  RFLAGS: 00000246
    RAX: ffffffffffffffda  RBX: ffffffff802602f9  RCX: ffffffffffffffff
    RDX: 0000000000000000  RSI: 000000000000003c  RDI: 0000000000000000
    RBP: 000000368e14d870   R8: 00000000000000e7   R9: ffffffffffffffb0
    R10: 0000000000000000  R11: 0000000000000246  R12: 0000000000000000
    R13: 000000368e14d870  R14: ffffffff8024af8b  R15: 0000000000000070
    ORIG_RAX: 00000000000000e7  CS: 0033  SS: e02b

Environment

  • Red Hat Enterprise Linux 5.5
    • Xen Virtualization

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