Hello, Adrian.
You wrote 12 августа 2013 г., 21:29:08:

AC> So the if_transmit() change did change a few things. if_start() /
AC> *_ENQUEUE() clears m_nextpkt().

AC> I'd like to know where m_nextpkt() is NOT being cleared.

AC> How about triggering it quickly - put in a panic there rather than
AC> NULL'ing it, then when it immediately panics, do a backtrace?
  So, replace printf() here with panic()?
  Now I have backtrace from panic BEFORE this diagnostic patch is applied.
  Isn't it enough?

#0  doadump (textdump=1) at pcpu.h:236
236     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=1) at pcpu.h:236
#1  0xffffffff804b4505 in kern_reboot (howto=260)
    at /data/src/sys/kern/kern_shutdown.c:447
#2  0xffffffff804b48e4 in panic (fmt=<value optimized out>)
    at /data/src/sys/kern/kern_shutdown.c:754
#3  0xffffffff806c5b5a in trap_fatal (frame=<value optimized out>, 
    eva=<value optimized out>) at /data/src/sys/amd64/amd64/trap.c:873
#4  0xffffffff806c5dc7 in trap_pfault (frame=0x0, usermode=0)
    at /data/src/sys/amd64/amd64/trap.c:699
#5  0xffffffff806c54f4 in trap (frame=0xffffff812205e7a0)
    at /data/src/sys/amd64/amd64/trap.c:463
#6  0xffffffff806af7b3 in calltrap ()
    at /data/src/sys/amd64/amd64/exception.S:232
#7  0xffffffff802ef411 in ath_transmit (ifp=0xfffffe0001a9a800, 
    m=<value optimized out>) at /data/src/sys/dev/ath/if_ath.c:2953
#8  0xffffffff8059a1e6 in ieee80211_vap_pkt_send_dest (
    vap=<value optimized out>, m=<value optimized out>, ni=0xffffff8000f96000)
    at /data/src/sys/net80211/ieee80211_output.c:239
#9  0xffffffff8059ae3b in ieee80211_vap_transmit (ifp=<value optimized out>, 
    m=<value optimized out>) at /data/src/sys/net80211/ieee80211_output.c:389
#10 0xffffffff8059f5ff in pwrsave_flushq (ni=<value optimized out>)
    at /data/src/sys/net80211/ieee80211_power.c:479
#11 0xffffffff80588209 in hostap_input (ni=0xffffff8000f96000, 
    m=<value optimized out>, rssi=43, nf=-96)
    at /data/src/sys/net80211/ieee80211_hostap.c:648
#12 0xffffffff8030825a in ath_rx_pkt (sc=0xffffff80007ba000, 
    rs=0xffffff8000880d78, status=HAL_OK, tsf=<value optimized out>, nf=-96, 
    qtype=<value optimized out>, m=<value optimized out>)
    at /data/src/sys/dev/ath/if_ath_rx.c:808
#13 0xffffffff80308ec0 in ath_rx_proc (sc=0xffffff80007ba000, resched=1)
    at /data/src/sys/dev/ath/if_ath_rx.c:995
#14 0xffffffff804f2426 in taskqueue_run_locked (queue=0xfffffe0001a59b00)
    at /data/src/sys/kern/subr_taskqueue.c:333
#15 0xffffffff804f2ca8 in taskqueue_thread_loop (arg=<value optimized out>)
    at /data/src/sys/kern/subr_taskqueue.c:535
#16 0xffffffff804885e5 in fork_exit (
    callout=0xffffffff804f2c00 <taskqueue_thread_loop>, 
    arg=0xffffff80007ba830, frame=0xffffff812205ec00)
    at /data/src/sys/kern/kern_fork.c:991
#17 0xffffffff806afcee in fork_trampoline ()
    at /data/src/sys/amd64/amd64/exception.S:606

// Black Lion AKA Lev Serebryakov <l...@freebsd.org>

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