Date: Fri, 29 Oct 2010 09:42:34 -0400 From: Mike Tancsa <mike@sentex.net> To: "Bjoern A. Zeeb" <bz@FreeBSD.org>, Denis Ahrens <denis@berlin.ccc.de> Cc: svn-src-head@FreeBSD.org, Randy Bush <randy@psg.com>, Philipp =?iso-8859-1?Q?W=FCnsche?= <cryx@h3q.com> Subject: Re: pending em0 commits for FreeBSD 8.1 STABLE Message-ID: <201010291342.o9TDggVQ062469@lava.sentex.ca> In-Reply-To: <20101029013606.I66242@maildrop.int.zabbadoz.net> References: <0C099B90-AFB9-422F-AB75-AFC138A36D20@berlin.ccc.de> <20101029013606.I66242@maildrop.int.zabbadoz.net>
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Actually,
I dont think its an em bug as I can trigger this crash with
the igb nic. Perhaps these are 2 different issues being hit ?
Anyways, I tried with igb from HEAD in case there is some common code
path between em and igb (2.0.1 vs 2.0.4). But the issue is still there
In the netperf cluster its trivial to trigger this bug. Try this on
camel and leopard1. Note bear1 is still on the console debugger as
well in case you want to compare 2 different machines.
camel1# route add -inet6 2607:f3e0:0:80::290 2607:f3e0:9::107
add host 2607:f3e0:0:80::290: gateway 2607:f3e0:9::107
camel1#
Then start a ping on camel1. Then, with the ping is going, on
leopard1 do an ifconfig em0 down. A few seconds later, the panic below
camel1# ping6 offsite.sentex.ca
PING6(56=40+8+8 bytes) 2607:f3e0:9::113 --> 2607:f3e0:0:80::290
16 bytes from 2607:f3e0:0:80::290, icmp_seq=0 hlim=60 time=3.988 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=1 hlim=60 time=3.321 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=2 hlim=60 time=3.834 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=3 hlim=60 time=3.206 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=4 hlim=60 time=3.076 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=5 hlim=60 time=5.182 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=6 hlim=60 time=3.437 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=7 hlim=60 time=3.308 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=8 hlim=60 time=3.555 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=9 hlim=60 time=2.929 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=10 hlim=60 time=3.903 ms
16 bytes from 2607:f3e0:0:80::290, icmp_seq=11 hlim=60 time=5.421 ms
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x20:0xffffffff808950c6
stack pointer = 0x28:0xffffff800006e950
frame pointer = 0x28:0xffffff800006e9a0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 12 (swi1: netisr 0)
[thread pid 12 tid 100011 ]
Stopped at bcopy+0x16: repe movsq (%rsi),%es:(%rdi)
db> bt
Tracing pid 12 tid 100011 td 0xffffff00024fd3e0
bcopy() at bcopy+0x16
ip6_input() at ip6_input+0x28f
swi_net() at swi_net+0x151
intr_event_execute_handlers() at intr_event_execute_handlers+0x66
ithread_loop() at ithread_loop+0xb2
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff800006ed30, rbp = 0 ---
db>
and using the igb driver from HEAD
Fatal trap 9: general protection fault while in kernel mode
cpuid = 2; apic id = 06
instruction pointer = 0x20:0xffffffff80881506
stack pointer = 0x28:0xffffff800006e950
frame pointer = 0x28:0xffffff800006e9a0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 12 (swi1: netisr 0)
[thread pid 12 tid 100011 ]
Stopped at bcopy+0x16: repe movsq (%rsi),%es:(%rdi)
db> bt
Tracing pid 12 tid 100011 td 0xffffff00024fd3e0
bcopy() at bcopy+0x16
ip6_input() at ip6_input+0x28f
swi_net() at swi_net+0x151
intr_event_execute_handlers() at intr_event_execute_handlers+0x66
ithread_loop() at ithread_loop+0xb2
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff800006ed30, rbp = 0 ---
db>
--------------------------------------------------------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet since 1994 www.sentex.net
Cambridge, Ontario Canada www.sentex.net/mike
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