deadc0de panic in fxp driver

[Kris Kennaway]

On Thu, Feb 16, 2006 at 03:15:14PM -0500, Kris Kennaway wrote:
> Peter Holm's stress test gave me this on an SMP machine running fresh
> 7.0:
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0xdeadc0de
> fault code              = supervisor write, page not present
> instruction pointer     = 0x20:0xc0681633
> stack pointer           = 0x28:0xf3bbeb88
> frame pointer           = 0x28:0xf3bbeb88
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = interrupt enabled, resume, IOPL = 0
> current process         = 24 (irq17: fxp0)
> [thread pid 24 tid 100020 ]
> Stopped at      trash_dtor+0x10:        movl    $0xdeadc0de,0(%edx)
> db> wh
> Tracing pid 24 tid 100020 td 0xcc47b1a0
> trash_dtor(deadc0de,800,0,f3bbebb8,c05295bb) at trash_dtor+0x10
> trash_init(deadc0de,800,1,7f,35) at trash_init+0x20
> mb_zinit_pack(ccb7e100,100,1,85f,f3bbebec) at mb_zinit_pack+0x50
> uma_zalloc_bucket(c1057000,1,c073d432,75d,0) at uma_zalloc_bucket+0x1f1
> uma_zalloc_arg(c1057000,f3bbec4c,1,1,c072a086) at uma_zalloc_arg+0x38e
> fxp_add_rfabuf(cc546000,cc54604c,2,61a,cc546014) at fxp_add_rfabuf+0x35
> fxp_intr_body(cc546000,cc53c000,40,ffffffff,cc53c000) at fxp_intr_body+0x115
> fxp_intr(cc546000,f3bbecdc,c052aa10,c07f5c90,1) at fxp_intr+0xcf
> ithread_execute_handlers(cc4cccd8,cc477700,c0725a19,2f9,cc47b1a0) at ithread_execute_handlers+0x10e
> ithread_loop(cc539960,f3bbed38,c0725807,31a,cc539960) at ithread_loop+0x78
> fork_exit(c051cdfa,cc539960,f3bbed38) at fork_exit+0xc5
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xf3bbed6c, ebp = 0 ---
> db>

Peter Holm has also seen this panic involving the fxp driver:

  http://people.freebsd.org/~pho/stress/log/cons186.html

When I ran the stress test on two machines with em they did not panic
after about twice as long under load.

Kris

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