Crash: DWARF2 unwinder stuck at apic_timer_interrupt

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Hello all,

Can anyone throw any light on this, it happens about 5 times a day :(, but does not always immediately crash the machine, but usually.
I got the same messages with the previous kernel (2.6.18-1.2798.fc6)

Also, the kernel is NOT tainted.
TIA:

Albert.

PS. What is DWARF2  - a better version than DWARF :(


Kernel: 2.6.18-1.2849.fc6

Nov 14 12:07:04 agraham kernel: BUG: soft lockup detected on CPU#3!
Nov 14 12:07:04 agraham kernel:  [<c04051db>] dump_trace+0x69/0x1af
Nov 14 12:07:04 agraham kernel:  [<c0405339>] show_trace_log_lvl+0x18/0x2c
Nov 14 12:07:04 agraham kernel:  [<c04058ed>] show_trace+0xf/0x11
Nov 14 12:07:04 agraham kernel:  [<c04059ea>] dump_stack+0x15/0x17
Nov 14 12:07:04 agraham kernel:  [<c044da8d>] softlockup_tick+0xad/0xc4
Nov 14 12:07:04 agraham kernel:  [<c042e59a>] update_process_times+0x39/0x5c
Nov 14 12:07:04 agraham kernel: [<c0418914>] smp_apic_timer_interrupt+0x5c/0x64
Nov 14 12:07:04 agraham kernel:  [<c0404ad3>] apic_timer_interrupt+0x1f/0x24
Nov 14 12:07:04 agraham kernel: DWARF2 unwinder stuck at apic_timer_interrupt+0x1f/0x24
Nov 14 12:07:04 agraham kernel: Leftover inexact backtrace:
Nov 14 12:07:04 agraham kernel: [<c041007b>] powernowk8_cpu_init+0x37a/0xcef
Nov 14 12:07:04 agraham kernel:  [<c04e9807>] _raw_spin_lock+0x6f/0xdc
Nov 14 12:07:04 agraham kernel:  [<c041fdb3>] try_to_wake_up+0x3ab/0x3b5
Nov 14 12:07:04 agraham kernel:  [<c0416ae3>] smp_send_reschedule+0x5f/0x64
Nov 14 12:07:04 agraham kernel: [<c04501b7>] __delayacct_blkio_ticks+0x13/0x63
Nov 14 12:07:04 agraham kernel:  [<c04a102c>] do_task_stat+0x4f4/0x9ad
Nov 14 12:07:04 agraham kernel:  [<c049da87>] pid_revalidate+0x61/0xd1
Nov 14 12:07:04 agraham kernel:  [<c047ae8f>] do_lookup+0x53/0x15a
Nov 14 12:07:04 agraham kernel:  [<c0483fd8>] dput+0x31/0xfe
Nov 14 12:07:04 agraham kernel:  [<c047d089>] __link_path_walk+0xc3d/0xd76
Nov 14 12:07:04 agraham kernel:  [<c0483fd8>] dput+0x31/0xfe
Nov 14 12:07:04 agraham kernel:  [<c04879e1>] mntput_no_expire+0x11/0x6e
Nov 14 12:07:04 agraham kernel:  [<c047d275>] link_path_walk+0xb3/0xbd
Nov 14 12:07:04 agraham kernel:  [<c047d5e8>] do_path_lookup+0x21a/0x26b
Nov 14 12:07:04 agraham kernel:  [<c042745f>] do_wait+0x8bf/0x9ad
Nov 14 12:07:04 agraham kernel:  [<c0457d27>] __alloc_pages+0x6d/0x2aa
Nov 14 12:07:04 agraham kernel:  [<c049ebf9>] proc_info_read+0x4a/0x9d
Nov 14 12:07:04 agraham kernel:  [<c049ebaf>] proc_info_read+0x0/0x9d
Nov 14 12:07:04 agraham kernel:  [<c046fbc8>] vfs_read+0xa6/0x157
Nov 14 12:07:04 agraham kernel:  [<c0470037>] sys_read+0x41/0x67
Nov 14 12:07:04 agraham kernel:  [<c0404013>] syscall_call+0x7/0xb
Nov 14 12:07:04 agraham kernel:  =======================
Nov 14 12:08:25 agraham gconfd (root-3733): Received signal 15, shutting down cleanly
====
Nov 14 17:51:42 agraham kernel: BUG: soft lockup detected on CPU#0!
Nov 14 17:51:42 agraham kernel:  [<c04051db>] dump_trace+0x69/0x1af
Nov 14 17:51:42 agraham kernel:  [<c0405339>] show_trace_log_lvl+0x18/0x2c
Nov 14 17:51:42 agraham kernel:  [<c04058ed>] show_trace+0xf/0x11
Nov 14 17:51:42 agraham kernel:  [<c04059ea>] dump_stack+0x15/0x17
Nov 14 17:51:42 agraham kernel:  [<c044da8d>] softlockup_tick+0xad/0xc4
Nov 14 17:51:42 agraham kernel:  [<c042e59a>] update_process_times+0x39/0x5c
Nov 14 17:51:42 agraham kernel: [<c0418914>] smp_apic_timer_interrupt+0x5c/0x64
Nov 14 17:51:42 agraham kernel:  [<c0404ad3>] apic_timer_interrupt+0x1f/0x24
Nov 14 17:51:42 agraham kernel: DWARF2 unwinder stuck at apic_timer_interrupt+0x1f/0x24
Nov 14 17:51:42 agraham kernel: Leftover inexact backtrace:
Nov 14 17:51:42 agraham kernel:  [<c04e9807>] _raw_spin_lock+0x6f/0xdc
Nov 14 17:51:42 agraham kernel:  [<c049da21>] task_dumpable+0x3f/0x44
Nov 14 17:51:42 agraham kernel: [<c04501b7>] __delayacct_blkio_ticks+0x13/0x63
Nov 14 17:51:42 agraham kernel:  [<c04a102c>] do_task_stat+0x4f4/0x9ad
Nov 14 17:51:42 agraham kernel:  [<c049da87>] pid_revalidate+0x61/0xd1
Nov 14 17:51:42 agraham kernel:  [<c047ae8f>] do_lookup+0x53/0x15a
Nov 14 17:51:42 agraham kernel:  [<c0483fd8>] dput+0x31/0xfe
Nov 14 17:51:42 agraham kernel:  [<c047d089>] __link_path_walk+0xc3d/0xd76
Nov 14 17:51:42 agraham kernel:  [<c0483fd8>] dput+0x31/0xfe
Nov 14 17:51:42 agraham kernel:  [<c04879e1>] mntput_no_expire+0x11/0x6e
Nov 14 17:51:43 agraham kernel:  [<c047d275>] link_path_walk+0xb3/0xbd
Nov 14 17:51:43 agraham kernel:  [<c047d5e8>] do_path_lookup+0x21a/0x26b
Nov 14 17:51:43 agraham kernel:  [<c0434501>] worker_thread+0xb2/0x10d
Nov 14 17:51:43 agraham kernel:  [<c0457d27>] __alloc_pages+0x6d/0x2aa
Nov 14 17:51:43 agraham kernel:  [<c049ebf9>] proc_info_read+0x4a/0x9d
Nov 14 17:51:43 agraham kernel:  [<c049ebaf>] proc_info_read+0x0/0x9d
Nov 14 17:51:43 agraham kernel:  [<c046fbc8>] vfs_read+0xa6/0x157
Nov 14 17:51:43 agraham kernel:  [<c0470037>] sys_read+0x41/0x67
Nov 14 17:51:43 agraham kernel:  [<c0404013>] syscall_call+0x7/0xb
Nov 14 17:51:43 agraham kernel:  =======================
Nov 14 17:54:53 agraham syslogd 1.4.1: restart.




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