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Date: Fri, 21 Oct 2005 23:57:48 +0400
From: Maxim Maximov <mcsi@mcsi.pp.ru>
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Subject: Re: boot panic (NDIS, SCHED_ULE?)
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Maxim Maximov wrote:
> Hi.
> 
>     Got boot time panic on fresh CURRENT.
>     NDIS hardware:
> 
> ndis0: <ASUS 802.11g Network Adapter> mem 0xfeaf8000-0xfeaf9fff irq 17 
> at device 2.0 on pci2
> ndis0: NDIS API version: 5.0
> ndis0: Ethernet address: 00:0e:a6:c2:00:e4
> 
>     Panic:
> ...
> Timecounters tick every 1.000 msec
> kernel trap 12 with interrupts disabled
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x109
> fault code              = supervisor read, page not present
> instruction pointer     = 0x20:0xc06a7570
> stack pointer           = 0x28:0xd5985cbc
> frame pointer           = 0x28:0xd5985cc4
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>                         = DPL 0, pres 1, def32 1, gran 1
> processor eflags        = resume, IOPL = 0
> current process         = 41 (Windows DPC 1)
> 
> 
>     Hand transcribed trace, abbreviated:
> 
> 
> Stopped at kseq_notify+0x94: cmpb 0x109(%edx), %al

Debugging shows that this is:

         pcpu = pcpu_find(cpu);
         td = pcpu->pc_curthread;
         if (ke->ke_thread->td_priority < td->td_priority ||

                                        ^^^^^ here.

             td == pcpu->pc_idlethread) {
                 td->td_flags |= TDF_NEEDRESCHED;
                 ipi_selected(1 << cpu, IPI_AST);
         }

And %edx holds 'td' pointer, not ke->ke_thread.
So I wonder could this be sched_ule problem, just being triggered by new 
NDIS code? I'll try to build sched_4bsd kernel now to see if it disappears.

> 
>  >trace
> kseq_notify(c1edbb24,1,c09c4520,c1edbb24,c08236bc) ...+0x94
> sched_bind(c1edb9c0,1) ...+0x62
> ntoskrnl_dpc_thread(c1f4fc3c,d5985d38,c1f4fc3c,c08236bc,0) ...+0x73
> fork_exit(c08236bc,c1f4fc3c,d5985d38) ...+0xa4
> fork_trampoline()
> 



-- 
Maxim Maximov