Date: Fri, 5 May 2000 11:28:55 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Howard Leadmon <howardl@account.abs.net> Cc: Bill Paul <wpaul@skynet.ctr.columbia.edu>, Greg Lehey <grog@lemis.com>, freebsd-stable@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: Debugging Kernel/System Crashes, can anyone help?? Message-ID: <200005051828.LAA80765@apollo.backplane.com> References: <200005051633.MAA13634@account.abs.net>
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: Hello Matt,
:
: Well I almost thought we had something here, as the machine actually stayed
:online for over a day this past time. Anyway I did add your patch, and when
:the machine died I now have a crashdump of the data with your patch included,
:when I will provide below. FYI, I have kept the past crashinfo as well as
:the current one, so if you need any other info just let me know. Hopefully
:something in this latest crash will stick out to you..
:...
This looks to be a different bug. I think it may be in Bill Paul's
department.
It looks like either 'sc' is NULL, or 'sc->dc_btag' or
'sc->dc_bhandle' is NULL in dc_intr. This could be SMP/interrupt
related.
It's hard to tell exactly which line is crunching due to the inline
I/O instruction in machien/cpufunc.h. It would help if you could
'nm kernel.debug | fgrep dc_intr' to locate the start adderss of
the dc_intr procedure.
It would also help if you could do the following from the gdb of the
kernel:
frame 14
print sc
print *sc
-Matt
Matthew Dillon
<dillon@backplane.com>
:Fatal trap 12: page fault while in kernel mode
:mp_lock = 01000003; cpuid = 1; lapic.id = 01000000
:fault virtual address = 0x30
:fault code = supervisor read, page not present
:instruction pointer = 0x8:0xc01cdca5
:stack pointer = 0x10:0xff80ddd0
:frame pointer = 0x10:0xff80ddd4
: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 = Idle
:interrupt mask = net bio cam <- SMP: XXX
:trap number = 12
:panic: page fault
:mp_lock = 01000003; cpuid = 1; lapic.id = 01000000
:boot() called on cpu#1
:Uptime: 1h52m40s
:
:dumping to dev #ad/0x20001, offset 128
:---
:#12 0xc02283d6 in trap_fatal (frame=0xff80df44, eva=0)
: at ../../i386/i386/trap.c:926
:#13 0xc0227d92 in trap (frame={tf_fs = -1072365544, tf_es = 1174929424,
: tf_ds = -1059192816, tf_edi = -194641856, tf_esi = -1059168256,
: tf_ebp = -8331372, tf_isp = -8331408, tf_ebx = -1059161408,
: tf_edx = 54312, tf_ecx = 0, tf_eax = -194641856, tf_trapno = 29,
: tf_err = 0, tf_eip = -1071900421, tf_cs = 8, tf_eflags = 582,
: tf_esp = -1059161408, tf_ss = 1074266112}) at ../../i386/i386/trap.c:586
:#14 0xc01c18fb in dc_intr (arg=0xc0de6000) at machine/cpufunc.h:331
:#15 0xc0230953 in intr_mux (arg=0xc0de7b20)
: at ../../i386/isa/intr_machdep.c:569
:(kgdb) q
:#
:---
:Howard Leadmon - howardl@abs.net - http://www.abs.net
:ABSnet Internet Services - Phone: 410-361-8160 - FAX: 410-361-8162
:
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