From owner-freebsd-wireless@FreeBSD.ORG Mon Aug 12 21:35:49 2013 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 967854D9; Mon, 12 Aug 2013 21:35:49 +0000 (UTC) (envelope-from lev@FreeBSD.org) Received: from onlyone.friendlyhosting.spb.ru (onlyone.friendlyhosting.spb.ru [IPv6:2a01:4f8:131:60a2::2]) by mx1.freebsd.org (Postfix) with ESMTP id 24E952D45; Mon, 12 Aug 2013 21:35:49 +0000 (UTC) Received: from lion.home.serebryakov.spb.ru (unknown [IPv6:2001:470:923f:1:acaf:d9db:8ffe:1642]) (Authenticated sender: lev@serebryakov.spb.ru) by onlyone.friendlyhosting.spb.ru (Postfix) with ESMTPSA id 43BD14AC1C; Tue, 13 Aug 2013 01:35:47 +0400 (MSK) Date: Tue, 13 Aug 2013 01:35:44 +0400 From: Lev Serebryakov Organization: FreeBSD Project X-Priority: 3 (Normal) Message-ID: <809218974.20130813013544@serebryakov.spb.ru> To: Adrian Chadd Subject: Re: ath as AP panics In-Reply-To: References: <238348209.20130812212328@serebryakov.spb.ru> <1391593482.20130812213235@serebryakov.spb.ru> <1769815169.20130812214148@serebryakov.spb.ru> MIME-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: quoted-printable Cc: freebsd-wireless@freebsd.org X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: lev@FreeBSD.org List-Id: "Discussions of 802.11 stack, tools device driver development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Aug 2013 21:35:49 -0000 Hello, Adrian. You wrote 12 =C1=D7=C7=D5=D3=D4=C1 2013 =C7., 21:47:46: >> AC> Hm. OK. >> AC> What I want is the code path _in_ that's queuing a frame via >> AC> ieee80211_vap_transmit() with m_nextpkt set to NON-NULL. >> I could set breakpoint on "printf()" from patch and get backtrace when= it >> will be hit. Is it enough? AC> yup db> trace Tracing pid 0 tid 100037 td 0xfffffe0001a95920 ieee80211_vap_transmit() at ieee80211_vap_transmit+0x12b/frame 0xffffff8122= 05e950 pwrsave_flushq() at pwrsave_flushq+0x19f/frame 0xffffff812205e9a0 hostap_input() at hostap_input+0x8a9/frame 0xffffff812205ea30 ath_rx_pkt() at ath_rx_pkt+0x3fa/frame 0xffffff812205eaa0 ath_rx_proc() at ath_rx_proc+0x290/frame 0xffffff812205eb30 taskqueue_run_locked() at taskqueue_run_locked+0xe6/frame 0xffffff812205eb80 taskqueue_thread_loop() at taskqueue_thread_loop+0xa8/frame 0xffffff812205e= bb0 fork_exit() at fork_exit+0x75/frame 0xffffff812205ebf0 fork_trampoline() at fork_trampoline+0xe/frame 0xffffff812205ebf0 --- trap 0, rip =3D 0, rsp =3D 0xffffff812205ecb0, rbp =3D 0 --- And here are files/lines in r254250 with "printf() patch"): // No surprise here :) (kgdb) list *(ieee80211_vap_transmit+0x12b) 0xffffffff8059ad6b is in ieee80211_vap_transmit (/data/src/sys/net80211/iee= e80211_output.c:466). 461 * Complain if m->m_nextpkt is set. 462 * 463 * The caller should've pulled this apart for us. 464 */ 465 if (m->m_nextpkt !=3D NULL) { 466 printf("%s: m_nextpkt not NULL?!\n", __func__); 467 m->m_nextpkt =3D NULL; 468 } 469 470 /* (kgdb) list *(pwrsave_flushq+0x19f) 0xffffffff8059f63f is in pwrsave_flushq (/data/src/sys/net80211/ieee80211_p= ower.c:477). 472 473 /* VAP frames, aren't encapsulated */ 474 if (ifp !=3D NULL) { 475 while (ifp_q !=3D NULL) { 476 m =3D ifp_q; 477 ifp_q =3D m->m_nextpkt; 478 KASSERT((!(m->m_flags & M_ENCAP)), 479 ("%s: vapq with M_ENCAP frame!\n", __fu= nc__)); 480 (void) ieee80211_vap_xmitpkt(vap, m); 481 } (kgdb) list *(hostap_input+0x8a9) 0xffffffff80588219 is in hostap_input (/data/src/sys/net80211/ieee80211_hos= tap.c:655). 650 /* 651 * For 4-address packets handle WDS discovery 652 * notifications. Once a WDS link is setup frames 653 * are just delivered to the WDS vap (see below). 654 */ 655 if (dir =3D=3D IEEE80211_FC1_DIR_DSTODS && ni->ni_w= dsvap =3D=3D NULL) { 656 if (!ieee80211_node_is_authorized(ni)) { 657 IEEE80211_DISCARD(vap, 658 IEEE80211_MSG_INPUT | 659 IEEE80211_MSG_WDS, wh, (kgdb) list *(ath_rx_proc+0x290) 0xffffffff80308ec0 is in ath_rx_proc (/data/src/sys/dev/ath/if_ath_rx.c:995= ). 990 * Process a single frame. 991 */ 992 bus_dmamap_sync(sc->sc_dmat, bf->bf_dmamap, BUS_DMA= SYNC_POSTREAD); 993 bus_dmamap_unload(sc->sc_dmat, bf->bf_dmamap); 994 bf->bf_m =3D NULL; 995 if (ath_rx_pkt(sc, rs, status, tsf, nf, HAL_RX_QUEU= E_HP, bf, m)) 996 ngood++; 997 rx_proc_next: 998 TAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list); 999 } while (ath_rxbuf_init(sc, bf) =3D=3D 0); --=20 // Black Lion AKA Lev Serebryakov