kernel fault -- 2.6.15 with tux patch applied

[Chris Davies]

problem does not seem to occur on a Uniprocessor machine.  Will try SMT 
later.

Chris Davies wrote:
> I had this problem on another machine, but, thought it was a one-off
> issue.  I issued the command reboot which caused this fault.
> 
> After tux has served data, it appears to get this error.  Configuration 
> of both machines with the issue are SMP machines (not SMT or 
> Uniprocessor).  I'll try again on a uniprocessor machine to see if the 
> problem persists.
> 
> Any pointers for diagnosing?
> 
> Jan 19 22:06:45 machine3 kernel: TUX: thread 1 stopping ...
> Jan 19 22:06:45 machine3 kernel: TUX: thread 0 stopping ...
> Jan 19 22:06:45 machine3 kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000020
> Jan 19 22:06:45 machine3 kernel:  printing eip:
> Jan 19 22:06:45 machine3 kernel: c02d5541
> Jan 19 22:06:45 machine3 kernel: *pde = 00000000
> Jan 19 22:06:45 machine3 kernel: Oops: 0002 [#1]
> Jan 19 22:06:45 machine3 kernel: SMP
> Jan 19 22:06:45 machine3 kernel: Modules linked in:
> Jan 19 22:06:45 machine3 kernel: CPU:    0
> Jan 19 22:06:45 machine3 kernel: EIP:
> 0060:[tux_flush_workqueue+81/185]    Not tainted VLI
> Jan 19 22:06:45 machine3 kernel: EFLAGS: 00010206   (2.6.15-tux3)
> Jan 19 22:06:45 machine3 kernel: EIP is at tux_flush_workqueue+0x51/0xb9
> Jan 19 22:06:45 machine3 kernel: eax: 00000000   ebx: f7bc0000   ecx:
> f7bc0028   edx: f7bc8028
> Jan 19 22:06:45 machine3 kernel: esi: c03ded20   edi: 00000000   ebp:
> 00000140   esp: f7343f10
> Jan 19 22:06:45 machine3 kernel: ds: 007b   es: 007b   ss: 0068
> Jan 19 22:06:45 machine3 kernel: Process tux (pid: 2234,
> threadinfo=f7342000 task=f72fea30)
> Jan 19 22:06:45 machine3 kernel: Stack: 00000003 c03ded20 c03ded20
> c02df38c c03ded20 c03ded20 c03ded20 c03dede0
> Jan 19 22:06:45 machine3 kernel:        c03dee70 c02df467 c03ded20
> c03ded20 f7342000 00000004 c03ded20 00000000
> Jan 19 22:06:45 machine3 kernel:        c02dff39 c03ded20 c0119b9e
> f7a3ea64 f72fea30 00000001 c0119d27 00000282
> Jan 19 22:06:45 machine3 kernel: Call Trace:
> Jan 19 22:06:45 machine3 kernel:  [flush_all_requests+28/85]
> flush_all_requests+0x1c/0x55
> Jan 19 22:06:45 machine3 kernel:  [user_req_stop_thread+117/223]
> user_req_stop_thread+0x75/0xdf
> Jan 19 22:06:45 machine3 kernel:  [__sys_tux+349/1736] 
> __sys_tux+0x15d/0x6c8
> Jan 19 22:06:45 machine3 kernel:  [lock_timer_base+25/51]
> lock_timer_base+0x19/0x33
> Jan 19 22:06:45 machine3 kernel:  [try_to_del_timer_sync+16/77]
> try_to_del_timer_sync+0x10/0x4d
> Jan 19 22:06:45 machine3 kernel:  [try_to_del_timer_sync+71/77]
> try_to_del_timer_sync+0x47/0x4d
> Jan 19 22:06:45 machine3 kernel:  [tux_exit+9/12] tux_exit+0x9/0xc
> Jan 19 22:06:45 machine3 kernel:  [do_exit+370/733] do_exit+0x172/0x2dd
> Jan 19 22:06:45 machine3 kernel:  [sys_exit_group+0/17]
> sys_exit_group+0x0/0x11
> Jan 19 22:06:45 machine3 kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
> Jan 19 22:06:45 machine3 kernel: Code: 00 00 8d 59 d8 f0 0f ba 71 20 00
> f0 0f ba 71 24 00 8b 11 8b 41 04 89 42 04 89 10 89 49 04 89 09 c6 86 8c
> 01 00 00 01 fb 8b 43 6c <c7> 40 20 00 00 00 00 c7 40 24 00 00 00 00 80
> bb ec 00 00 00 00
> Jan 19 22:06:45 machine3 kernel:  <1>Fixing recursive fault but reboot
> is needed!
> Jan 19 22:06:45 machine3 kernel: TUX: thread 1 stopped.
> 
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