Date: Sun, 10 Aug 1997 11:54:04 -0600 From: Steve Passe <smp@csn.net> To: current@FreeBSD.ORG Subject: Re: Trap 9 When Boot SMP Message-ID: <199708101754.LAA11619@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Sat, 09 Aug 1997 16:23:28 CDT." <199708092123.QAA14184@zuhause.mn.org>
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Hi,
Thomas found a 'fix', although we don't understand WHY the problem exists.
It appears that %es is getting corrupted somewhere during boot. The
'solution' was:
> The es value IS the culprit.
>
> Havn't found where it is being mangled, I suspect the
> doreti code.
>
> I nailed es to ds at the top of smp_idleloop in init_smp.c.
> asm("pushl %ds; popl %es");
---
This corruption of %es is very repeatable, with a value of 0x27 appearing:
changing root device to sd2
APIC_IO: routing 8254 via 8259 pn pin 0
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0
instruction pointer = 0x8:0xf0216e22
stack pointer = 0x10:0xf42baea4
frame pointer = 0x10:0xf42bbaef8
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 6 (cpuidle1)
interrupt mask
kernel: type 9 trap, code = 0
CPU0 stopping CPUs: 0x00000002
stopped
Stopped at _sccnputc+0x22: repe movsl (%esi),%es(%edi)
db> trace
_sccnputc(cff,53,5,f42baf24,f011fab7) at sccnputc+0x22
_cnputc(53,0,0,53,f42baf70) at _cnputc+0x42
_putchar(53,f42baf94) at _putchar+0x97
_kvprintf(f010d931,f011fa20,f42baf94,a,f42bafa8) at _kvprintf+065
_printf(f010d30,0,f010dadc,f02d2ff4,f01cd307) at _printf+0x3d
_smp_idleloop(0) at smp_idleloop+0x24
_fork_trampoline(0,0,f066a200,f42b9000) at _fork_trampoline+0x13
---
anyone have any theories about this one? This is the only reported system
having this problem, and I have no clues as to why...
--
Steve Passe | powered by
smp@csn.net | Symmetric MultiProcessor FreeBSD
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