Date: Sun, 30 Nov 2008 18:02:02 -0800 From: Kris Kennaway <kris@FreeBSD.org> To: net@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org> Subject: panic from ifconfig in IFAREF Message-ID: <4933459A.5090806@FreeBSD.org>
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I got this panic on HEAD when trying to configure an IP address on an
interface immediately after boot:
> Fatal trap 9: general protection fault while in kernel mode
> ccpuid = 4; xapic id = 04
> ginstruction pointer = 0x8:0xffffffff80494b42
> bstack pointer = 0x10:0xffffffff20938490
> 0frame pointe:r = 0x10:0xffffffff20938610
> code segment = base 0x0, limit 0xfffff, type 0x1b
> link state changed to DOWN
> = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 1073 (ifconfig)
> [thread pid 1073 tid 100250 ]
> Stopped at strlen+0x2: cmpb $0,(%rdi)
> db> wh
> Tracing pid 1073 tid 100250 td 0xffffff00077ab720
> strlen() at strlen+0x2
> vsnprintf() at vsnprintf+0x2e
> panic() at panic+0x1d8
> _mtx_lock_flags() at _mtx_lock_flags+0xd9
> rtrequest1_fib() at rtrequest1_fib+0x3e6
> rtinit() at rtinit+0x213
> in_ifinit() at in_ifinit+0x2bd
> in_control() at in_control+0xe95
> ifioctl() at ifioctl+0xfa
> kern_ioctl() at kern_ioctl+0x92
> ioctl() at ioctl+0xfd
> syscall() at syscall+0x1bc
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x140a69dfc, rsp =
0x7fffffffe588, rbp = 0x7fffffffef7c ---
> __func__.6541+0xfcb: mtx_lock() of spin mutex %s @ %s:%d
The panic is here:
/*
* Note that we now have a reference to the ifa.
* This moved from below so that rnh->rnh_addaddr() can
* examine the ifa and ifa->ifa_ifp if it so desires.
*/
IFAREF(ifa);
(net/route.c:1081)
Kris
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