r254093 wi-fi related instability

[Lev Serebryakov]

Hello, Adrian.
You wrote 9 августа 2013 г., 18:12:11:

AC> Hm! Interesting! Yes, please get me some panic information.
 CABOOM!

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff802ef251
stack pointer           = 0x28:0xffffff812205f850
frame pointer           = 0x28:0xffffff812205f8c0
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 taskq)
trap number             = 12
panic: page fault
cpuid = 1
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffff812205f400
kdb_backtrace() at kdb_backtrace+0x39/frame 0xffffff812205f4b0
panic() at panic+0x155/frame 0xffffff812205f530
trap_fatal() at trap_fatal+0x37a/frame 0xffffff812205f590
trap_pfault() at trap_pfault+0x257/frame 0xffffff812205f630
trap() at trap+0x454/frame 0xffffff812205f790
calltrap() at calltrap+0x8/frame 0xffffff812205f790
--- trap 0xc, rip = 0xffffffff802ef251, rsp = 0xffffff812205f850, rbp = 0xffffff812205f8c0 ---
ath_transmit() at ath_transmit+0x2e1/frame 0xffffff812205f8c0
ieee80211_vap_pkt_send_dest() at ieee80211_vap_pkt_send_dest+0x236/frame 0xffffff812205f910
ieee80211_vap_transmit() at ieee80211_vap_transmit+0x1e9/frame 0xffffff812205f950
pwrsave_flushq() at pwrsave_flushq+0x19f/frame 0xffffff812205f9a0
hostap_input() at hostap_input+0x8a9/frame 0xffffff812205fa30
ath_rx_pkt() at ath_rx_pkt+0x3fa/frame 0xffffff812205faa0
ath_rx_proc() at ath_rx_proc+0x290/frame 0xffffff812205fb30
taskqueue_run_locked() at taskqueue_run_locked+0xe6/frame 0xffffff812205fb80
taskqueue_thread_loop() at taskqueue_thread_loop+0xa8/frame 0xffffff812205fbb0
fork_exit() at fork_exit+0x75/frame 0xffffff812205fbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xffffff812205fbf0
--- trap 0, rip = 0, rsp = 0xffffff812205fcb0, rbp = 0 ---

 Unfortunately, it is NanoBSD-based system, so here ate no debugging
sysmbols or kernel core :(

-- 
// Black Lion AKA Lev Serebryakov <lev at FreeBSD.org>