Panic in stable/11 (amd64) @r303903: page fault while in kernel mode
Bryan Drewery
bdrewery at FreeBSD.org
Wed Aug 10 19:10:09 UTC 2016
On 8/10/16 9:54 AM, David Wolfskill wrote:
> Happened after a few iterations of {"pkill dhclient" followed by
> "dhclient wlan0"}.
>
> Gory details (both "normal" and gzipped, and including the crash
> dump and crashinfo) are in
> <http://www.catwhisker.org/~david/FreeBSD/stable_11/2016.08.10/>.
>
> Summary:
> Wed Aug 10 15:56:26 UTC 2016
>
> FreeBSD 11.0-BETA4 FreeBSD 11.0-BETA4 #69 r303902M/303903:1100120: Wed Aug 10 04:00:09 PDT 2016 root at g1-252.catwhisker.org:/common/S3/obj/usr/src/sys/CANARY amd64
>
> panic: page fault
>
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
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> There is absolutely no warranty for GDB. Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd"...
>
> Unread portion of the kernel message buffer:
>
>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 7; apic id = 07
> fault virtual address = 0x0
> fault code = supervisor read data, page not present
> instruction pointer = 0x20:0xffffffff80bdaaa1
> stack pointer = 0x28:0xfffffe060bc956e0
> frame pointer = 0x28:0xfffffe060bc957b0
> 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 = 20685 (wpa_supplicant)
> trap number = 12
> panic: page fault
> cpuid = 7
> KDB: stack backtrace:
> #0 0xffffffff80add787 at kdb_backtrace+0x67
> #1 0xffffffff80a950e2 at vpanic+0x182
> #2 0xffffffff80a94f53 at panic+0x43
> #3 0xffffffff80eead51 at trap_fatal+0x351
> #4 0xffffffff80eeaf43 at trap_pfault+0x1e3
> #5 0xffffffff80eea4ec at trap+0x26c
> #6 0xffffffff80ece0d1 at calltrap+0x8
> #7 0xffffffff80b9811c at ifioctl+0x133c
> #8 0xffffffff80afc914 at kern_ioctl+0x2d4
> #9 0xffffffff80afc5d1 at sys_ioctl+0x171
> #10 0xffffffff80eeb6c9 at amd64_syscall+0x4e9
> #11 0xffffffff80ece3bb at Xfast_syscall+0xfb
> Uptime: 3h0m4s
> ...
> Reading symbols from /boot/kernel/linux64.ko...Reading symbols from /usr/lib/debug//boot/kernel/linux64.ko.debug...done.
> done.
> Loaded symbols for /boot/kernel/linux64.ko
> #0 doadump (textdump=<value optimized out>) at pcpu.h:221
> 221 pcpu.h: No such file or directory.
> in pcpu.h
> (kgdb) #0 doadump (textdump=<value optimized out>) at pcpu.h:221
> #1 0xffffffff80a94b69 in kern_reboot (howto=260)
> at /usr/src/sys/kern/kern_shutdown.c:366
> #2 0xffffffff80a9511b in vpanic (fmt=<value optimized out>,
> ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:759
> #3 0xffffffff80a94f53 in panic (fmt=0x0)
> at /usr/src/sys/kern/kern_shutdown.c:690
> #4 0xffffffff80eead51 in trap_fatal (frame=0xfffffe060bc95630, eva=0)
> at /usr/src/sys/amd64/amd64/trap.c:841
> #5 0xffffffff80eeaf43 in trap_pfault (frame=0xfffffe060bc95630, usermode=0)
> at /usr/src/sys/amd64/amd64/trap.c:691
> #6 0xffffffff80eea4ec in trap (frame=0xfffffe060bc95630)
> at /usr/src/sys/amd64/amd64/trap.c:442
> #7 0xffffffff80ece0d1 in calltrap ()
> at /usr/src/sys/amd64/amd64/exception.S:236
> #8 0xffffffff80bdaaa1 in ieee80211_ioctl (ifp=0xfffff80007991800,
> cmd=<value optimized out>, data=<value optimized out>)
> at /usr/src/sys/net80211/ieee80211_ioctl.c:3398
The code crashing is quite recent:
> commit c6321695321bae43c0cd024db564c5207a7e8e31
> Author: avos <avos at ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f>
> Date: Mon May 2 20:46:05 2016 +0000
>
> net80211: fix MAC address change via SIOCSIFLLADDR ioctl.
>
> Recheck MAC address on SIOCSIFFLAGS; as a result,
> 'ifconfig wlan0 ether <addr>' can be used after interface startup.
>
> PR: 208933
>
>
> git-svn-id: svn+ssh://svn.freebsd.org/base/head@298941 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
>
> diff --git sys/net80211/ieee80211_ioctl.c sys/net80211/ieee80211_ioctl.c
> index c3b02e8..823906b 100644
> --- sys/net80211/ieee80211_ioctl.c
> +++ sys/net80211/ieee80211_ioctl.c
> @@ -3382,8 +3382,18 @@ ieee80211_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
> }
> IEEE80211_UNLOCK(ic);
> /* Wait for parent ioctl handler if it was queued */
> - if (wait)
> + if (wait) {
> ieee80211_waitfor_parent(ic);
> +
> + /*
> + * Check if the MAC address was changed
> + * via SIOCSIFLLADDR ioctl.
> + */
> + if ((ifp->if_flags & IFF_UP) == 0 &&
> + !IEEE80211_ADDR_EQ(vap->iv_myaddr, IF_LLADDR(ifp)))
> + IEEE80211_ADDR_COPY(vap->iv_myaddr,
> + IF_LLADDR(ifp));
> + }
> break;
> case SIOCADDMULTI:
> case SIOCDELMULTI:
> #9 0xffffffff80b9811c in ifioctl (so=<value optimized out>,
> cmd=<value optimized out>, data=<value optimized out>,
> td=<value optimized out>) at /usr/src/sys/net/if.c:2447
> #10 0xffffffff80afc914 in kern_ioctl (td=<value optimized out>,
> fd=<value optimized out>, com=2149607696, data=0xfffffe060bc958e0 "wlan0")
> at file.h:327
> #11 0xffffffff80afc5d1 in sys_ioctl (td=<value optimized out>,
> uap=0xfffffe060bc95a40) at /usr/src/sys/kern/sys_generic.c:743
> #12 0xffffffff80eeb6c9 in amd64_syscall (td=<value optimized out>,
> traced=<value optimized out>) at subr_syscall.c:135
> #13 0xffffffff80ece3bb in Xfast_syscall ()
> at /usr/src/sys/amd64/amd64/exception.S:396
> #14 0x00000008015c448a in ?? ()
> Previous frame inner to this frame (corrupt stack?)
> Current language: auto; currently minimal
> (kgdb)
>
> This was on my laptop, which I'm actively using at work as I type
> -- though it's now connected via wired NIC (em0). I had experienced
> no trouble with wlan0 at home (before coming in to work) or on the
> bus (en route to work). (I didn't attempt it while cycling to the
> bus stop. :-})
>
> Also, I had no issues running stable/11 (amd64) @303870 -- either
> at home or at work -- yesterday. On the other hand, this is (so
> far) a one-off, so alleging a "pattern" at this point is not something
> I'm willing to do.
>
> Peace,
> david
>
--
Regards,
Bryan Drewery
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