Date: Sat, 3 Oct 2015 01:10:46 +0300 From: Nikos Vassiliadis <nvass@gmx.com> To: freebsd-net@freebsd.org Subject: carp on if_bridge deadlock Message-ID: <560F00E6.5010503@gmx.com>
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Hi, I am trying to use carp over an if_bridge and am getting this LOR: > login: lock order reversal: > 1st 0xfffff8000848a018 if_bridge (if_bridge) @ /usr/src/sys/modules/if_bridge/../../net/if_bridge.c:2315 > 2nd 0xfffff80003a58778 carp_if (carp_if) @ /usr/src/sys/modules/carp/../../netinet/ip_carp.c:1118 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0092c3b6a0 > witness_checkorder() at witness_checkorder+0xe7a/frame 0xfffffe0092c3b720 > __mtx_lock_flags() at __mtx_lock_flags+0xa8/frame 0xfffffe0092c3b770 > carp_forus() at carp_forus+0x7a/frame 0xfffffe0092c3b7b0 > bridge_input() at bridge_input+0x338/frame 0xfffffe0092c3b820 > ether_nh_input() at ether_nh_input+0x2ab/frame 0xfffffe0092c3b860 > netisr_dispatch_src() at netisr_dispatch_src+0x86/frame 0xfffffe0092c3b8d0 > ether_input() at ether_input+0x4f/frame 0xfffffe0092c3b900 > vtnet_rxq_eof() at vtnet_rxq_eof+0x845/frame 0xfffffe0092c3b9b0 > vtnet_rx_vq_intr() at vtnet_rx_vq_intr+0x4e/frame 0xfffffe0092c3b9e0 > intr_event_execute_handlers() at intr_event_execute_handlers+0xe4/frame 0xfffffe0092c3ba20 > ithread_loop() at ithread_loop+0xa6/frame 0xfffffe0092c3ba70 > fork_exit() at fork_exit+0x84/frame 0xfffffe0092c3bab0 > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0092c3bab0 > --- trap 0, rip = 0, rsp = 0, rbp = 0 --- Eventually all network activity will stop and this will happen: > load: 0.33 cmd: ifconfig 665 [*carp_if] 228.29r 0.00u 0.01s 0% 2716k Or: > load: 2.86 cmd: ifconfig 720 [running] 104.92r 0.00u 36.53s 100% 2716k A single ping to the carp address is enough to trigger the problem. The debugger says: > db> show all locks > Process 669 (sysctl) thread 0xfffff800084269a0 (100082) > exclusive sleep mutex Giant (Giant) r = 0 (0xffffffff81cc4e90) locked @ /usr/src/sys/kern/kern_sysctl.c:164 > Process 668 (ifconfig) thread 0xfffff8000842e9a0 (100079) > exclusive sx carp_sx (carp_sx) r = 0 (0xffffffff820b0ac0) locked @ /usr/src/sys/modules/carp/../../netinet/ip_carp.c:1644 > Process 12 (intr) thread 0xfffff800038a89a0 (100010) > exclusive sleep mutex carp_softc (carp_softc) r = 0 (0xfffff80008266508) locked @ /usr/src/sys/kern/kern_mutex.c:158 > Process 12 (intr) thread 0xfffff80003a679a0 (100031) > exclusive sleep mutex carp_if (carp_if) r = 0 (0xfffff8000825b078) locked @ /usr/src/sys/modules/carp/../../netinet/ip_carp.c:1118 > exclusive sleep mutex if_bridge (if_bridge) r = 0 (0xfffff80008467018) locked @ /usr/src/sys/modules/if_bridge/../../net/if_bridge.c:2315 > db> There is a related PR https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200319 But I couldn't apply cleanly the patch to HEAD or 10-STABLE. Thanks for any insights, Nikos
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