Date: Wed, 29 Aug 2012 13:45:29 -0700 From: Navdeep Parhar <np@FreeBSD.org> To: Vijay Singh <vijju.singh@gmail.com> Cc: net@freebsd.org Subject: Re: witness warning in arp processing Message-ID: <503E7F69.9070108@FreeBSD.org> In-Reply-To: <CALCNsJR-Gp05T10Bdf51zK15OcOyf=7qWZXNLEw-T6nxLsVArw@mail.gmail.com>
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On 08/29/12 10:30, Vijay Singh wrote: > All, I am seeing this warning on my 8.2 based system. > > taskqueue_drain with the following non-sleepable locks held: > exclusive rw lle (lle) r = 0 (0xffffff0014dc9110) locked @ sys/netinet/in.c:1760 > KDB: stack backtrace: > kdb_backtrace() at kdb_backtrace+0x3e > _witness_debugger() at _witness_debugger+0x24 > witness_warn() at witness_warn+0x402 > taskqueue_drain() at taskqueue_drain+0x36 > cancel_delayed_work() at cancel_delayed_work+0x56 > set_timeout() at set_timeout+0x18 > netevent_callback() at netevent_callback+0x29 > _handle_arp_update_event() at _handle_arp_update_event+0x31 > in_arpinput() at in_arpinput+0xe92 > arpintr() at arpintr+0x255 > netisr_dispatch_src() at netisr_dispatch_src+0x14a > netisr_dispatch() at netisr_dispatch+0x20 > ether_demux() at ether_demux+0x281 > ether_input_internal() at ether_input_internal+0x60c > ether_nh_input() at ether_nh_input+0x1d > netisr_dispatch_src() at netisr_dispatch_src+0x14a > netisr_dispatch() at netisr_dispatch+0x20 > ether_input() at ether_input+0xef > lem_rxeof() at lem_rxeof+0x6ee > lem_handle_rxtx() at lem_handle_rxtx+0x4f > taskqueue_run_locked() at taskqueue_run_locked+0x145 > taskqueue_thread_loop() at taskqueue_thread_loop+0x73 > fork_exit() at fork_exit+0x180 > fork_trampoline() at fork_trampoline+0xe > > Is this a known issue? Has it been fixed? This is a bug in the OFED code. The event handler it registers for the ARP update is not supposed to do anything that could sleep.. Regards, Navdeephome | help
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