Date: Sat, 13 Aug 2005 14:56:37 +0100 (BST) From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> To: current@freebsd.org Cc: glebius@freebsd.org Subject: Arp locking patches Message-ID: <20050813145127.M49387@ury.york.ac.uk>
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Hi,
I was wondering if the arp locking patches (sys/netinet/if_ether.c 1.138-9
and related changes) were planned to be MFC'd before 6.0 is released? I'm
seeing a panic on a dual CPU machine running BETA2/amd64 and am seeing the
following panic semi-regularly which looks like it may be related to the
lack of locking on the arp tables.
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x8:0xffffffff803f80da
stack pointer = 0x10:0xffffffffb49c76f0
frame pointer = 0x10:0xffffffffb49c7710
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 = 1073 (udp)
[thread pid 1073 tid 100100 ]
Stopped at m_tag_delete_chain+0x2a: movq 0(%rbx),%rsi
db>
db> tr
Tracing pid 1073 tid 100100 td 0xffffff0060ddebe0
m_tag_delete_chain() at m_tag_delete_chain+0x2a
mb_dtor_mbuf() at mb_dtor_mbuf+0x4d
uma_zfree_arg() at uma_zfree_arg+0x331
m_freem() at m_freem+0x41
arpresolve() at arpresolve+0x2f3
ether_output() at ether_output+0x23a
ip_output() at ip_output+0xb17
udp_send() at udp_send+0x42c
sosend() at sosend+0x654
soo_write() at soo_write+0x4d
dofilewrite() at dofilewrite+0x87
kern_writev() at kern_writev+0x51
write() at write+0x4a
syscall() at syscall+0x4b2
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (4, FreeBSD ELF64, write), rip = 0x80067c81c, rsp =
0x7fffffffe4d8, rbp = 0x7fffffffe520 ---
db>
Note that the above was provoked with Peter Holm's stress test kit, but I
have also had it on this machine in everyday use. I'd be happy to test
any patch.
Thanks,
Gavin
--
"Experience is directly proportional to the value of equipment destroyed."
-- Carolyn Scheppner
- Gavin Atkinson - General layabout - University Radio York -
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