https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208636
Bug ID: 208636
Summary: [net80211][panic]Kernel panic in adhoc mode
Product: Base System
Version: 10.3-BETA2
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: wireless
Assignee: freebsd-wireless@FreeBSD.org
Reporter: shamaz.ma...@gmail.com
Hello. I am using FreeBSD 10.3-RELEASE and have a following bug when trying to
configure adhoc mode on Atheros Wi-Fi adapter (the driver is ath, of course).
I do the following in console:
$ ifconfig wlan0 create wlandev ath0 wlanmode adhoc
$ ifconfig wlan0 up
$ ifconfig wlan0 list scan (optional, I think)
$ ifconfig wlan0 ssid skynetV6 channel 10
and get a kernel panic.
When I do just this, as it is stated in manual, everything is OK:
$ ifconfig wlan0 create wlandev ath0 wlanmode adhoc
$ ifconfig wlan0 ssid skynetV6 channel 10
kgdb output:
root@ressurected:~ # kgdb /boot/kernel/kernel /var/crash/vmcore.0
GNU gdb 6.1.1 [FreeBSD]
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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 = 0; apic id = 10
fault virtual address = 0xffff
fault code = supervisor read data, page not present
instruction pointer = 0x20:0xffffffff80a77017
stack pointer = 0x28:0xfffffe023bb037c0
frame pointer = 0x28:0xfffffe023bb03820
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 = 0 (ath0 net80211 taskq)
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe023bb032a0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe023bb03350
vpanic() at vpanic+0x126/frame 0xfffffe023bb03390
panic() at panic+0x43/frame 0xfffffe023bb033f0
trap_fatal() at trap_fatal+0x36b/frame 0xfffffe023bb03450
trap_pfault() at trap_pfault+0x2ed/frame 0xfffffe023bb034f0
trap() at trap+0x47a/frame 0xfffffe023bb03700
calltrap() at calltrap+0x8/frame 0xfffffe023bb03700
--- trap 0xc, rip = 0xffffffff80a77017, rsp = 0xfffffe023bb037d0, rbp =
0xfffffe023bb03820 ---
ieee80211_beacon_construct() at ieee80211_beacon_construct+0x97/frame
0xfffffe023bb03820
ieee80211_beacon_alloc() at ieee80211_beacon_alloc+0xa2/frame
0xfffffe023bb03870
ath_beacon_alloc() at ath_beacon_alloc+0x75/frame 0xfffffe023bb038c0
ath_newstate() at ath_newstate+0x22a/frame 0xfffffe023bb03920
ieee80211_newstate_cb() at ieee80211_newstate_cb+0x14f/frame 0xfffffe023bb03970
taskqueue_run_locked() at taskqueue_run_locked+0xe5/frame 0xfffffe023bb039c0
taskqueue_thread_loop() at taskqueue_thread_loop+0xa8/frame 0xfffffe023bb039f0
fork_exit() at fork_exit+0x9a/frame 0xfffffe023bb03a30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe023bb03a30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 7m35s
Dumping 458 out of 8147 MB:..4%..11%..21%..32%..42%..53%..63%..74%..81%..91%
Reading symbols from /boot/kernel/zfs.ko.symbols...done.
Loaded symbols for /boot/kernel/zfs.ko.symbols
Reading symbols from /boot/kernel/opensolaris.ko.symbols...done.
Loaded symbols for /boot/kernel/opensolaris.ko.symbols
Reading symbols from /boot/kernel/amdtemp.ko.symbols...done.
Loaded symbols for /boot/kernel/amdtemp.ko.symbols
Reading symbols from /boot/kernel/if_bridge.ko.symbols...done.
Loaded symbols for /boot/kernel/if_bridge.ko.symbols
Reading symbols from /boot/kernel/bridgestp.ko.symbols...done.
Loaded symbols for /boot/kernel/bridgestp.ko.symbols
Reading symbols from /boot/kernel/wlan_xauth.ko.symbols...done.
Loaded symbols for /boot/kernel/wlan_xauth.ko.symbols
#0 doadump (textdump=1) at pcpu.h:219
219 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) bt
#0 doadump (textdump=1) at pcpu.h:219
#1 0xffffffff8095cd47 in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:486
#2 0xffffffff8095d145 in vpanic (fmt=<value optimized out>, ap=<value
optimized out>)
at /usr/src/sys/kern/kern_shutdown.c:889
#3 0xffffffff8095cfd3 in panic (fmt=0x0) at
/usr/src/sys/kern/kern_shutdown.c:818
#4 0xffffffff80d847bb in trap_fatal (frame=<value optimized out>, eva=<value
optimized out>)
at /usr/src/sys/amd64/amd64/trap.c:858
#5 0xffffffff80d84abd in trap_pfault (frame=0xfffffe023bb03710,
usermode=<value optimized out>)
at /usr/src/sys/amd64/amd64/trap.c:681
#6 0xffffffff80d8413a in trap (frame=0xfffffe023bb03710) at
/usr/src/sys/amd64/amd64/trap.c:447
#7 0xffffffff80d69b22 in calltrap () at
/usr/src/sys/amd64/amd64/exception.S:236
#8 0xffffffff80a77017 in ieee80211_beacon_construct (m=0xfffff800930d9c00,
frm=0xfffff80093159158 "",
bo=0xfffff800932b89f8, ni=0xfffffe0004ea7000) at
/usr/src/sys/net80211/ieee80211_output.c:2110
#9 0xffffffff80a76e52 in ieee80211_beacon_alloc (ni=0xfffffe0004ea7000,
bo=0xfffff800932b89f8)
at /usr/src/sys/net80211/ieee80211_output.c:3046
#10 0xffffffff80421545 in ath_beacon_alloc (sc=0xfffffe0000b0c000,
ni=0xfffffe0004ea7000)
at /usr/src/sys/dev/ath/if_ath_beacon.c:201
#11 0xffffffff80420aea in ath_newstate (vap=0xfffff800932b8000, nstate=<value
optimized out>,
arg=<value optimized out>) at /usr/src/sys/dev/ath/if_ath.c:5398
#12 0xffffffff80a7942f in ieee80211_newstate_cb (xvap=0xfffff800932b8000,
npending=<value optimized out>)
at /usr/src/sys/net80211/ieee80211_proto.c:1756
#13 0xffffffff809ac135 in taskqueue_run_locked (queue=0xfffff800055e1500) at
/usr/src/sys/kern/subr_taskqueue.c:342
#14 0xffffffff809acbc8 in taskqueue_thread_loop (arg=<value optimized out>)
at /usr/src/sys/kern/subr_taskqueue.c:563
#15 0xffffffff8092524a in fork_exit (callout=0xffffffff809acb20
<taskqueue_thread_loop>, arg=0xfffffe0000b3e0f0,
frame=0xfffffe023bb03a40) at /usr/src/sys/kern/kern_fork.c:1027
#16 0xffffffff80d6a05e in fork_trampoline () at
/usr/src/sys/amd64/amd64/exception.S:611
#17 0x0000000000000000 in ?? ()
Current language: auto; currently minimal
(kgdb) frame 8
#8 0xffffffff80a77017 in ieee80211_beacon_construct (m=0xfffff800930d9c00,
frm=0xfffff80093159158 "",
bo=0xfffff800932b89f8, ni=0xfffffe0004ea7000) at
/usr/src/sys/net80211/ieee80211_output.c:2110
2110 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(kgdb) p ni->ni_chan
$1 = (struct ieee80211_channel *) 0xffff
(kgdb) p ni->ni_ic->ic_bsschan
$2 = (struct ieee80211_channel *) 0xfffffe0000b3e56c
(kgdb) p *ni->ni_ic->ic_bsschan
$3 = {ic_flags = 263296, ic_freq = 2457, ic_ieee = 10 '\n', ic_maxregpower = 20
'\024', ic_maxpower = 63 '?',
ic_minpower = 0 '\0', ic_state = 0 '\0', ic_extieee = 6 '\006', ic_maxantgain
= 0 '\0', ic_pad = 0 '\0',
ic_devdata = 9}
(kgdb) root@ressurected:~ # exit
The real line in frame 8 is capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
in ieee80211_beacon_construct()
It's clear that ni->ni_chan contains IEEE80211_CHAN_ANY constant and is being
dereferenced.
This problem report looks very similar to bug #145826, but I am not sure if it
is the same bug (likely so), or a different one, because steps to repeat it
differ with mine.
Also this problem exists in DragonFlyBSD
(http://bugs.dragonflybsd.org/issues/2891), but folks there are not eager to
help.
Also, can anyone tell me if this problem is driver or net80211 code specific? I
mean, can you repeat it with other (non-Atheros) hardware?
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