From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 17 09:40:55 2004
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Date: Wed, 17 Nov 2004 10:40:47 +0100
From: Lukas Ertl <lukas.ertl@gmail.com>
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Subject: 5.3-STABLE frozen on heavy network load
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Hi,

I'm seeing complete freezes on a 5.3-STABLE SMP (with HTT) kernel from
Fri Nov 12.  The machine is acting as a newsserver, thus it has heavy
network and disk load.

With the help of MP_WATCHDOG I was able to get a backtrace:

Watchdog timer: 2
Watchdog timer: 1
Watchdog timer: 0
Watchdog firing!
NMI ... going to debugger
[thread 100305]
Stopped at      slab_zalloc+0x2c:       setz    %al
db> where
slab_zalloc(c0c1fb00,2,c0c1fb00,c0c1fb00,0) at slab_zalloc+0x2c
uma_zone_slab(c0c1fb00,2) at uma_zone_slab+0xd0
uma_zalloc_internal(c0c1fb00,c39b1100,2,0,c39b1100) at uma_zalloc_internal+0x4d
uma_zalloc_arg(c0c1fb00,c39b1100,2) at uma_zalloc_arg+0x2f8
mb_init_pack(c39b1100,100,2) at mb_init_pack+0x1d
uma_zalloc_internal(c0c1fc60,e93d2c74,2,11a8,0) at uma_zalloc_internal+0xe3
uma_zalloc_arg(c0c1fc60,e93d2c74,2) at uma_zalloc_arg+0x2f8
sosend(c391f510,0,c3f3ad80,0,0) at sosend+0x33d
soo_write(c54caae4,c3f3ad80,c3858c80,0,c40897d0) at soo_write+0x62
writev(c40897d0,e93d2d14,3,c,202) at writev+0xc6
syscall(2f,2f,2f,1,1) at syscall+0x283
Xint0x80_syscall() at Xint0x80_syscall+0x1f

The kgdb debug log can be found at
<http://people.freebsd.org/~le/debug.log>.  The coredump and the
kernel is still available if I should send more info.

Thanks,
le