if_alloc() page fault, VirtualBox + VIMAGE

[Bjoern A. Zeeb]

On Tue, 1 Feb 2011, Monthadar Al Jaberi wrote:

> Hi,
>
> I am running FreeBSD Current (201010) as guest in VirtualBox on an
> Ubuntu 10.04. FreeBSD is compiled with VIMAGE option.
>
> I loaded a module (my own) that calls if_alloc(IFT_IEEE80211), but I
> get a panic:

see discussions and patch on freebsd-virtualization@



> Kernel page fault with the following non-sleepable locks held:
> exclusive rw ifnet_rw (ifnet_rw) r = 0 (0xc0fc8284) locked @
> /usr/src/sys/net/if.c:414
> KDB: stack backtrace:
> db_trace_self_wrapper(c0cf3cdb,1,0,0,0,...) at db_trace_self_wrapper+0x26
> kdb_backtrace(19e,1,ffffffff,c0f9b194,c2fc9a1c,...) at kdb_backtrace+0x2a
> _witness_debugger(c0cf6408,c2fc9a30,4,1,0,...) at _witness_debugger+0x25
> witness_warn(5,0,c0d2c479,3,c4070d48,...) at witness_warn+0x1fe
> trap(c2fc9abc) at trap+0x195
> calltrap() at calltrap+0x6
> --- trap 0xc, eip = 0xc0970999, esp = 0xc2fc9afc, ebp = 0xc2fc9b1c ---
> ifindex_alloc_locked(c0d003cf,c2fc9b36,19e,19e,c15ab714,...) at
> ifindex_alloc_locked+0x19
> if_alloc(47,c4085a16,3,c0de9614,c32aa780,...) at if_alloc+0x85
> wtap_attach(c31a7800,c40857c0,0,4,0,...) at wtap_attach+0x29
> new_wtap(c32aa780,0,c2fc9bf0,c083ac9b,c3cbb200,...) at new_wtap+0x9b
> wtap_ioctl(c3cbb200,80045701,c31edaa0,1,c3f90b40,...) at wtap_ioctl+0x36
> devfs_ioctl_f(c3cfe3b8,80045701,c31edaa0,c3185d00,c3f90b40,...) at
> devfs_ioctl_f+0x10b
> kern_ioctl(c3f90b40,3,80045701,c31edaa0,fc9cec,...) at kern_ioctl+0x20d
> ioctl(c3f90b40,c2fc9cec,c2fc9d28,c0cf5783,0,...) at ioctl+0x134
> syscallenter(c3f90b40,c2fc9ce4,c2fc9ce4,0,0,...) at syscallenter+0x263
> syscall(c2fc9d28) at syscall+0x34
> Xint0x80_syscall() at Xint0x80_syscall+0x21
> --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x28181203, esp =
> 0xbfbfec3c, ebp = 0xbfbfec58 ---
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address	= 0x18
> fault code		= supervisor read, page not present
> instruction pointer	= 0x20:0xc0970999
> stack pointer	        = 0x28:0xc2fc9afc
> frame pointer	        = 0x28:0xc2fc9b1c
> 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		= 1203 (ioctl)
> panic: from debugger
> cpuid = 0
> Uptime: 21s
> Physical memory: 495 MB
> Dumping 55 MB: 40 24 8
>
>
> Without VIMAGE option if_alloc returns fine, I thought if I dont
> create any VNETs the system should behave like normal... what is the
> problem?
>
> Best regards,
>
>

-- 
Bjoern A. Zeeb                                 You have to have visions!
         <ks> Going to jail sucks -- <bz> All my daemons like it!
   http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html