The following reply was made to PR kern/172963; it has been noted by GNATS.
From: "Charbon, Julien" <jchar...@verisign.com>
To: bug-follo...@freebsd.org
Cc:
Subject: Re: kern/172963: Kernel panic in udp_input()
Date: Fri, 26 Oct 2012 13:54:38 +0200
I confirm that this race condition is also present in IPv6 UDP code
(Not a surprise as FreeBSD UDP v4 and v6 codes are pretty symmetric),
and below the stack trace:
Fatal trap 12: page fault while in kernel mode
cpuid = 7; apic id = 22
fault virtual address = 0x7
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff807b60be
stack pointer = 0x28:0xffffffa41c83e510
frame pointer = 0x28:0xffffffa41c83e5a0
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 (irq291: ix1:que 7)
trap number = 12
panic: page fault
cpuid = 7
KDB: stack backtrace:
#0 0xffffffff80642b3e at kdb_backtrace+0x5e
#1 0xffffffff8060fd57 at panic+0x187
#2 0xffffffff80905990 at trap_fatal+0x290
#3 0xffffffff80905ce1 at trap_pfault+0x201
#4 0xffffffff8090619f at trap+0x3df
#5 0xffffffff808ed674 at calltrap+0x8
#6 0xffffffff807b6986 at ip6_savecontrol+0x36
#7 0xffffffff807cd5c0 at udp6_append+0x60
#8 0xffffffff807ce99d at udp6_input+0x63d
#9 0xffffffff807b76bf at ip6_input+0xb4f
#10 0xffffffff806cb23e at netisr_dispatch_src+0x7e
#11 0xffffffff806c12dd at ether_demux+0x14d
#12 0xffffffff806c16e7 at ether_input+0x197
#13 0xffffffff806c11ff at ether_demux+0x6f
#14 0xffffffff806c16e7 at ether_input+0x197
#15 0xffffffff803e3d8b at ixgbe_rxeof+0x1eb
#16 0xffffffff803e4578 at ixgbe_msix_que+0xa8
#17 0xffffffff805e7794 at intr_event_execute_handlers+0x104
--
Julien
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