Date: Mon, 02 Jul 2018 09:08:12 -0500 From: Mark Felder <feld@FreeBSD.org> To: freebsd-hackers@freebsd.org Subject: IPv6 UDP panic on CURRENT Message-ID: <1530540492.517203.1427327440.52FB6E20@webmail.messagingengine.com>
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I was having nightly crashes for a while but my watchdog was resetting the server. Finally disabled so I could see the screen. It was happening when my acme (Let's Encrypt) script was running to generate new certificates and uses DNS validation which hits a nameserver hosted on the same box and accessible over IPv6. Fatal trap 12: page fault while in kernel mode cpuid = 11; apic id = 14 fault virtual address = 0xcd fault code = supervisor read data, page not present instruction pointer = 0x20:0xffffffff80e1dc46 stack pointer = 0x28:0xfffffe00005ab760 frame pointer = 0x28:0xfffffe00005ab800 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 12 (swi1: netisr 0) [ thread pid 12 tid 100086 ] Stopped at ip6_savecontrol_v4+0x26: testb $0x4,ll+0xac(%rax) db> bt Tracing pid 12 tid 100086 td 0xfffff8000381c580 ip6_savecontrol_v4() at ip6_savecontrol_v4+0x26/frame 0xfffffe00005ab800 ip6_savecontrol() at ip6_savecontrol+0x2c/frame 0xfffffe00005ab850 udp6_append() at udp6_append+0xe7/frame 0xfffffe00005ab8a0 udp6_input() at udp6_input+0x4f8/frame 0xfffffe00005ab9c0 ip6_input() at ip6_input+0xdd8/frame 0xfffffe00005abab0 swi_net() at swi_net+0x17b/frame 0xfffffe00005abb20 intr_event_execute_handlers() at intr_event_execute_handlers+0xe9/frame 0xfffffe00005abb60 ithread_loop() at ithread_loop+0xe7/frame 0xfffffe00005abbb0 fork_exit() at fork_exit+0x83/frame 0xfffffe00005abbf0 fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00005abbf0 --- trap 0, rip = 0, rsp = 0, rbp = 0 --- FreeBSD colo.feld.me 12.0-CURRENT FreeBSD 12.0-CURRENT #3 r335699M: Wed Jun 27 09:09:28 UTC 2018 root@colo.feld.me:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-MLX4 amd64 If there is more information I can collect next time please let me know. -- Mark Felder ports-secteam & portmgr member feld@FreeBSD.org
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