Date: Mon, 12 Aug 2013 21:32:35 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: ath as AP panics Message-ID: <1391593482.20130812213235@serebryakov.spb.ru> In-Reply-To: <CAJ-Vmo=JKZ51N-=NotZm1ba_7AUuEpdUhqP8Ah%2BAHNm-k-bifw@mail.gmail.com> References: <238348209.20130812212328@serebryakov.spb.ru> <CAJ-Vmo=JKZ51N-=NotZm1ba_7AUuEpdUhqP8Ah%2BAHNm-k-bifw@mail.gmail.com>
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Hello, Adrian.
You wrote 12 =E0=E2=E3=F3=F1=F2=E0 2013 =E3., 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=3D1) at pcpu.h:236
236 pcpu.h: No such file or directory.
in pcpu.h
(kgdb) #0 doadump (textdump=3D1) at pcpu.h:236
#1 0xffffffff804b4505 in kern_reboot (howto=3D260)
at /data/src/sys/kern/kern_shutdown.c:447
#2 0xffffffff804b48e4 in panic (fmt=3D<value optimized out>)
at /data/src/sys/kern/kern_shutdown.c:754
#3 0xffffffff806c5b5a in trap_fatal (frame=3D<value optimized out>,=20
eva=3D<value optimized out>) at /data/src/sys/amd64/amd64/trap.c:873
#4 0xffffffff806c5dc7 in trap_pfault (frame=3D0x0, usermode=3D0)
at /data/src/sys/amd64/amd64/trap.c:699
#5 0xffffffff806c54f4 in trap (frame=3D0xffffff812205e7a0)
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=3D0xfffffe0001a9a800,=20
m=3D<value optimized out>) at /data/src/sys/dev/ath/if_ath.c:2953
#8 0xffffffff8059a1e6 in ieee80211_vap_pkt_send_dest (
vap=3D<value optimized out>, m=3D<value optimized out>, ni=3D0xffffff80=
00f96000)
at /data/src/sys/net80211/ieee80211_output.c:239
#9 0xffffffff8059ae3b in ieee80211_vap_transmit (ifp=3D<value optimized ou=
t>,=20
m=3D<value optimized out>) at /data/src/sys/net80211/ieee80211_output.c=
:389
#10 0xffffffff8059f5ff in pwrsave_flushq (ni=3D<value optimized out>)
at /data/src/sys/net80211/ieee80211_power.c:479
#11 0xffffffff80588209 in hostap_input (ni=3D0xffffff8000f96000,=20
m=3D<value optimized out>, rssi=3D43, nf=3D-96)
at /data/src/sys/net80211/ieee80211_hostap.c:648
#12 0xffffffff8030825a in ath_rx_pkt (sc=3D0xffffff80007ba000,=20
rs=3D0xffffff8000880d78, status=3DHAL_OK, tsf=3D<value optimized out>, =
nf=3D-96,=20
qtype=3D<value optimized out>, m=3D<value optimized out>)
at /data/src/sys/dev/ath/if_ath_rx.c:808
#13 0xffffffff80308ec0 in ath_rx_proc (sc=3D0xffffff80007ba000, resched=3D1)
at /data/src/sys/dev/ath/if_ath_rx.c:995
#14 0xffffffff804f2426 in taskqueue_run_locked (queue=3D0xfffffe0001a59b00)
at /data/src/sys/kern/subr_taskqueue.c:333
#15 0xffffffff804f2ca8 in taskqueue_thread_loop (arg=3D<value optimized out=
>)
at /data/src/sys/kern/subr_taskqueue.c:535
#16 0xffffffff804885e5 in fork_exit (
callout=3D0xffffffff804f2c00 <taskqueue_thread_loop>,=20
arg=3D0xffffff80007ba830, frame=3D0xffffff812205ec00)
at /data/src/sys/kern/kern_fork.c:991
#17 0xffffffff806afcee in fork_trampoline ()
at /data/src/sys/amd64/amd64/exception.S:606
--=20
// Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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