Date: Tue, 6 Mar 2012 16:33:03 +0100 From: Marko Zec <zec@fer.hr> To: freebsd-virtualization@freebsd.org Cc: Adrian Chadd <adrian.chadd@gmail.com> Subject: Re: VIMAGE + kldload wlan + kldload wtap panic Message-ID: <201203061633.03446.zec@fer.hr> In-Reply-To: <CA%2BsBSoJJbsrCCp-GzZOJU-gMjDYsM4UX0fj5no-5%2BazThq0_Kg@mail.gmail.com> References: <CA%2BsBSo%2Bt=p0HLbyOH87DOJWWYn%2Be%2Bok7cwRiL1c1=gCw5=KTqg@mail.gmail.com> <201203060052.28603.zec@fer.hr> <CA%2BsBSoJJbsrCCp-GzZOJU-gMjDYsM4UX0fj5no-5%2BazThq0_Kg@mail.gmail.com>
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On Tuesday 06 March 2012 10:53:18 Monthadar Al Jaberi wrote: > On Tue, Mar 6, 2012 at 12:52 AM, Marko Zec <zec@fer.hr> wrote: > > On Monday 05 March 2012 22:14:45 Monthadar Al Jaberi wrote: > >> Hi, > >> > >> I am a very happy VIMAGE user. But lately I have been having problems > >> using it, and its too complicated for me to dig in so I hope you can > >> help me (and help Adrian too). > >> > >> I am using FreeBSD Current with a kernel config without wlan module > >> and wireless devices =A0attach kernel config. > >> > >> uname -a shows: > >> FreeBSD acke 10.0-CURRENT FreeBSD 10.0-CURRENT #2: Mon Mar =A05 20:02:= 38 > >> CET 2012 =A0 =A0 root@acke:/usr/obj/usr/src/sys/VNET_without_wlan =A0a= md64 > >> > >> I run the following commands: > >> cd /usr/sys/module/wlan > >> make load > >> cd /usr/sys/modules/wtap > >> make load > >> > >> then: > >> /usr/src/ools/tools/wtap/wtap/wtap c 0 > >> ifconfig wlan create wlandev wtap0 wlanmode mesh > >> wlandebug -i wlan0 hwmp+mesh+output+input+inact > >> ifconfig wlan0 meshid mymesh > >> ifconfig wlan0 inet 192.168.2.1 > >> > >> and freebsd panics with: > >> Mon Mar =A05 21:17:46 CET 2012 > >> Mar =A05 21:59:23 acke login: ROOT LOGIN (root) ON ttyv0 > >> Using visibility wtap plugin... > >> Loaded wtap wireless simulator > >> wtap0: ieee80211_radiotap_attach: no tx channel, radiotap 0x0wtap0: > >> ieee80211_radiotap_attach: no rx channel, radiotap 0x0wlan0: Ethernet > >> address: 00:98:9a:98:96:97 > >> wlan0: ieee80211_start: ignore queue, in SCAN state > >> wlan0: [00:98:9a:98:96:97] ieee80211_alloc_node: inact_reload 2 > >> Kernel page fault with the following non-sleepable locks held: > >> exclusive sleep mutex wtap0_com_lock (wtap0_com_lock) r =3D 0 > >> (0xffffff8002395018) locked @ > >> /usr/src/sys/modules/wlan/../../net80211/ieee80211_proto.c:1937 > >> KDB: stack backtrace: > >> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a > >> kdb_backtrace() at kdb_backtrace+0x37 > >> _witness_debugger() at _witness_debugger+0x2c > >> witness_warn() at witness_warn+0x2c4 > >> trap() at trap+0x2fe > >> calltrap() at calltrap+0x8 > >> --- trap 0xc, rip =3D 0xffffffff80885d0c, rsp =3D 0xffffff80003e9a00, = rbp > >> =3D 0xffffff80003e9a20 --- > >> rt_dispatch() at rt_dispatch+0x2c > >> rt_ieee80211msg() at rt_ieee80211msg+0x7f > >> scan_task() at scan_task+0x4cd > >> taskqueue_run_locked() at taskqueue_run_locked+0x93 > >> taskqueue_thread_loop() at taskqueue_thread_loop+0x3e > > > > It may be that scan_task() calls further down into the network stack > > without setting curvnet first. > > I added CURVNET_SET(TD_TO_VNET(curthread))/CURVNET_RESTORE() in > scan_task but it didnt help scan_task() is called from a taskqueue trampoline which doesn't have a vali= d=20 TD_TO_VNET(curthread) context, so what you attempted to do can't work. You= =20 need to set curvnet context to the one to which the network interface (or a= =20 packet) you're working with belongs to. Perhaps you could use (struct ieee80211_scan_state *) ss->ss_vap->iv_ifp->if_curvnet in scan_task() to set curvnet, but having no clue on how the 80211 code wor= ks,=20 I might be wrong... And maybe you could consider rebuilding your kernel with options VNET_DEBUG= =20 turned on - that should more verbosely point to the problem at hand, while= =20 not introducing too big a performance penalty at runtime. Good luck, Marko
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