kern/65801: 5.2.1 locks up with SMP kernel

[Russell Francis]

The following reply was made to PR kern/65801; it has been noted by GNATS.

From: Russell Francis <rf358197 at ohio.edu>
To: freebsd-gnats-submit at FreeBSD.org
Cc:  
Subject: Re: kern/65801: 5.2.1 locks up with SMP kernel
Date: Thu, 06 May 2004 12:55:54 -0500

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  > >Description:
  > The machine which is a dual PIII "locks up" after a day or so when it 
  > is compiled with an SMP kernel.  I have been unable to duplicate this 
  > with a UP kernel.  When I say lock up, the following things occur.
  >
  > - Screen goes black.
  >
  > - Keyboard becomes unresponsive [Numlock/capslock] don't toggle 
 lights >    on the keyboard.
  >
  > - The machine becomes unpingable and ssh into the machine no longer > 
  >    works.
 
   The machine is probably either panicking, or deadlocking due a locking
   error.  Enable WITNESS, DDB, INVARIANTS and kernel crashdumping, and
   try to obtain debugging information.  Leaving the machine out of X
   Windows may also help, because you'll see the panic message on the
   system console.  See the Developer's Handbook and for more details.
 
   Kris,
 
 I haven't had any luck getting a core nor has the machine locked up like 
 it had before.  I have however been able to get it to drop to the kernel 
 debugger.  Here is the stack trace if that helps.  It looks like a 
 possible locking issue.
 
 lock order reversal
   1st 0xc070a800 UMA lock (UMA lock) @ vm/uma_core.c:1200
   2nd 0xc0c31100 system map (system map ) @ vm/vm_map.c:2210
 Stack backtrace:
 
 backtrace(c066e42c,c0c31100,c0679189,c0679189,c06791e4) at backtrace+0x17
 
 witness_lock(c0c31100,8,c06791e4,8a2,c0c310a0) at witness_lock+0x5aa
 
 _mtx_lock_flags(c0c31100,0,c06791db,8a2,c4a5f000) at _mtx_lock_flags+0x6a
 
 _vm_map_lock(c0c310a0,c06791db,8a2,c070a0c0,1) at _vm_map_lock+0x36
 
 vm_map_remove(c0c310a0,c4a5e000,c4a5f000,d767fbf8,c05faadb) at 
 vm_map_remove+0x30
 
 kmem_free(c0c310a0,c4a5e000,1000,d767fc28,c05fa4ef) at kmem_free+0x32
 
 page_free(c4a5e000,1000,2,0,c4a5e000) at page_free+0x3b
 
 zone_drain(c0c2b380,0,c067a289,4b0,0) at zone_drain+0x2cf
 
 zone_foreach(c05fa220,d767fcf0,c05f7aa6,c067a191,0) at zone_foreach+0x45
 
 uma_reclaim(c067a191,0,c067a13a,29e,c06e1bc0) at uma_reclaim+0x17
 
 vm_pageout_scan(0,0,c067a13a,5a9,1f4) at vm_pageout_scan+0xf6
 
 vm_pageout(0,d767fd48,c066a061,311,0) at vm_pageout+0x31b
 
 fork_exit(c05f8840,0,d767fd48) at fork_exit+0x7e
 
 fork_trampoline() at fork_trampoline+0x8
 
 --- trap 0x1, eip = 0, esp = 0xd767fd7c, ebp = 0 ---
 
 Debugger("witness_lock")
 Stopped at Debugger+0x55: xchgl %ebx,in_Debugger.0
 
 
 
 --------------------------------------------------------------------------
 
 Looking at the output from dmesg also revealed this
 
 lock order reversal
   1st 0xc070a800 UMA lock (UMA lock) @ vm/uma_core.c:1200
   2nd 0xc0c31100 system map (system map) @ vm/vm_map.c:2210
 Stack backtrace:
 psmintr: delay too long; resetting byte count
 drm0: <Matrox G400/G450 (AGP)> mem 
 0xd7000000-0xd77fffff,0xd6000000-0xd6003fff,0xd4000000-0xd5ffffff irq 9 
 at device 0.0 on pci1
 info: [drm] AGP at 0xd0000000 64MB
 info: [drm] Initialized mga 3.1.0 20021029 on minor 0
 drm0: [MPSAFE]
 lock order reversal
   1st 0xc4678108 vm object (vm object) @ vm/swap_pager.c:1323
   2nd 0xc0709c80 swap_pager swhash (swap_pager swhash) @ 
 vm/swap_pager.c:1838
   3rd 0xc0c358c4 vm object (vm object) @ vm/uma_core.c:873
 Stack backtrace:
 
 
 
 I hope this helps a little, I am still trying to get a core ...
 
 Thanks,
 Russell Francis
 
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