Date: Tue, 30 Oct 2007 09:38:47 +0800 (CST) From: Tai-hwa Liang <avatar@mmlab.cse.yzu.edu.tw> To: David Wolfskill <david@catwhisker.org> Cc: current@freebsd.org Subject: Re: Detach of an0 induced kernel panic in 7.0-PRE Message-ID: <0710300936223.30335@www.mmlab.cse.yzu.edu.tw> In-Reply-To: <20071029190208.GD78150@bunrab.catwhisker.org> References: <20071029190208.GD78150@bunrab.catwhisker.org>
next in thread | previous in thread | raw e-mail | index | archive | help
This message is in MIME format. The first part should be readable text,
while the remaining parts are likely unreadable without MIME-aware tools.
--0-727875523-1193708327=:30335
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
On Mon, 29 Oct 2007, David Wolfskill wrote:
[...]
> command-line prompt. In an attempt to speed things up(!), I detached
> the an0 NIC.
>
> Boom!
>
> h252(7.0)[6] uname -a
> FreeBSD h252.dhw.mail-abuse.org. 7.0-BETA1 FreeBSD 7.0-BETA1 #573: Mon Oct 29 10:24:52 PDT 2007 root@h252.dhw.mail-abuse.org.:/common/S3/obj/usr/src/sys/CANARY i386
> h252(7.0)[7]
> h252(7.0)[1] cd /usr/obj/usr/src/sys/CANARY/
> h252(7.0)[2] kgdb kernel.debug /var/crash/vmcore.5
> [GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
> GNU gdb 6.1.1 [FreeBSD]
> ...
> This GDB was configured as "i386-marcel-freebsd".
>
> Unread portion of the kernel message buffer:
> an0: RID access failed
> an0: detached
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address = 0xc8283178
> fault code = supervisor write, page not present
> instruction pointer = 0x20:0xc04daaf7
> stack pointer = 0x28:0xe2987c5c
> frame pointer = 0x28:0xe2987c78
> 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 = 12 (swi4: clock sio)
> trap number = 12
> panic: page fault
> cpuid = 0
> Uptime: 31m46s
> Physical memory: 1011 MB
> Dumping 173 MB: 158 142 126 110 94 78 62 46 30 14
>
> #0 doadump () at pcpu.h:195
> 195 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
> (kgdb) bt
> #0 doadump () at pcpu.h:195
> #1 0xc073b637 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
> #2 0xc073b8f9 in panic (fmt=Variable "fmt" is not available.
> ) at /usr/src/sys/kern/kern_shutdown.c:563
> #3 0xc0a005dc in trap_fatal (frame=0xe2987c1c, eva=3358077304)
> at /usr/src/sys/i386/i386/trap.c:872
> #4 0xc0a00860 in trap_pfault (frame=0xe2987c1c, usermode=0, eva=3358077304)
> at /usr/src/sys/i386/i386/trap.c:785
> #5 0xc0a011d5 in trap (frame=0xe2987c1c) at /usr/src/sys/i386/i386/trap.c:463
> #6 0xc09e71eb in calltrap () at /usr/src/sys/i386/i386/exception.s:139
> #7 0xc04daaf7 in an_stats_update (xsc=0xc8282000) at atomic.h:149
> #8 0xc074d7ea in softclock (dummy=0x0) at /usr/src/sys/kern/kern_timeout.c:274
> #9 0xc071ef0b in ithread_loop (arg=0xc3f0d2f0)
> at /usr/src/sys/kern/kern_intr.c:1036
> #10 0xc071bc19 in fork_exit (callout=0xc071ed60 <ithread_loop>,
> arg=0xc3f0d2f0, frame=0xe2987d38) at /usr/src/sys/kern/kern_fork.c:796
> #11 0xc09e7260 in fork_trampoline () at /usr/src/sys/i386/i386/exception.s:205
> (kgdb)
>
> Any hints would be welcome.
>
> (Save for this -- well, and the fact that I can't really use wi0(4) while
> running 7.x or 8 -- RELENG_7 seems OK so far.)
>
> I'm about to flip over to slice 4 (to build today's HEAD), but after
> that's done, I should be able to look at the crash dump a bit
> more.
>
> (And I'm fine with testing changes & patches -- given enough hints, I
> can cause moderate damage to unsuspecting source files, even.)
Does the attached patch help?
--
Cheers,
Tai-hwa Liang
--0-727875523-1193708327=:30335
Content-Type: TEXT/PLAIN; charset=US-ASCII; name=if_an.c.stat.patch
Content-Transfer-Encoding: BASE64
Content-ID: <07103009384712.30335@www.mmlab.cse.yzu.edu.tw>
Content-Description:
Content-Disposition: attachment; filename=if_an.c.stat.patch
LS0tIGlmX2FuLmMub3JpZwkyMDA3LTA5LTEyIDE1OjA4OjI2LjAwMDAwMDAw
MCArMDgwMA0KKysrIGlmX2FuLmMJMjAwNy0xMC0zMCAwOTozNDo0NS4wMDAw
MDAwMDAgKzA4MDANCkBAIC0xMTUxLDYgKzExNTEsMTAgQEANCiANCiAJc2Mg
PSB4c2M7DQogCUFOX0xPQ0soc2MpOw0KKwlpZiAoc2MtPmFuX2dvbmUpIHsN
CisJCUFOX1VOTE9DSyhzYyk7DQorCQlyZXR1cm47DQorCX0NCiAJaWZwID0g
c2MtPmFuX2lmcDsNCiANCiAJc2MtPmFuX3N0YXR1cy5hbl90eXBlID0gQU5f
UklEX1NUQVRVUzsNCg==
--0-727875523-1193708327=:30335--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?0710300936223.30335>