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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