Date: Tue, 23 Feb 2021 17:27:04 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 253800] [panic] FreeBSD-13.0 (releng/13.0) panic upon duplicate IPv4 detection / page fault while in kernel mode (in function rtsock_routemsg_info) Message-ID: <bug-253800-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253800 Bug ID: 253800 Summary: [panic] FreeBSD-13.0 (releng/13.0) panic upon duplicate IPv4 detection / page fault while in kernel mode (in function rtsock_routemsg_info) Product: Base System Version: 13.0-STABLE Hardware: amd64 OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: freebsdml@hecian.net Created attachment 222763 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D222763&action= =3Dedit core.txt output Hello, Kernel version : Version String: FreeBSD 13.0-BETA3 #7 n244527-9f00cb5fa8a4: Fri Feb 19 23:4= 2:51 CET 2021 root@sparta:/usr/obj/usr/src/amd64.amd64/sys/GENERIC Panic String: page fault The system is quite simple (and used for actual FreeBSD 13, was installed f= rom an ALPHA2 image, then updated manually to git releng/13.0 branch, going thr= ough ALPHA3/BETA1/2/3). Additionnal modules/config removed the system still panics (removed nvidia module, linux module, and associated x11/kde5 startup items as well as cust= om sysctl.conf entries). I was testing a pfSense release on a VM sharing the same lan segment, but forgot to disconnect the VM's network NICs. The VM advertised the same IPv4 addr as the FreeBSD 13 testing machine, whi= ch panicked shortly after : Feb 23 17:28:25 sparta kernel: arp: 00:0c:29:f6:2d:60 is using my IP address 192.168.1.1 on em0! Feb 23 17:29:34 sparta syslogd: kernel boot file is /boot/kernel/kernel Feb 23 17:29:34 sparta kernel: Feb 23 17:29:34 sparta syslogd: last message repeated 1 times Feb 23 17:29:34 sparta kernel: Fatal trap 12: page fault while in kernel mo= de Feb 23 17:29:34 sparta kernel: cpuid =3D 7; apic id =3D 07 Feb 23 17:29:34 sparta kernel: fault virtual address =3D 0x300000056 Feb 23 17:29:34 sparta kernel: fault code =3D supervisor read= data, page not present Feb 23 17:29:34 sparta kernel: instruction pointer =3D 0x20:0xffffffff80d4c716 Feb 23 17:29:34 sparta kernel: stack pointer =3D 0x28:0xfffffe006b9d9f20 Feb 23 17:29:34 sparta kernel: frame pointer =3D 0x28:0xfffffe006b9d9f50 Feb 23 17:29:34 sparta kernel: code segment =3D base 0x0, limit 0xfffff, type 0x1b Feb 23 17:29:34 sparta kernel: =3D DPL 0, pres 1, long 1, = def32 0, gran 1 Feb 23 17:29:34 sparta kernel: processor eflags =3D interrupt enabled, resu= me, IOPL =3D 0 Feb 23 17:29:34 sparta kernel: current process =3D 0 (if_io_tqg_7) Feb 23 17:29:34 sparta kernel: trap number =3D 12 Feb 23 17:29:34 sparta kernel: panic: page fault Feb 23 17:29:34 sparta kernel: cpuid =3D 7 Feb 23 17:29:34 sparta kernel: time =3D 1614097724 Feb 23 17:29:34 sparta kernel: KDB: stack backtrace: Feb 23 17:29:34 sparta kernel: #0 0xffffffff80c568c5 at kdb_backtrace+0x65 Feb 23 17:29:34 sparta kernel: #1 0xffffffff80c09491 at vpanic+0x181 Feb 23 17:29:34 sparta kernel: #2 0xffffffff80c09303 at panic+0x43 Feb 23 17:29:34 sparta kernel: #3 0xffffffff810891a7 at trap_fatal+0x387 Feb 23 17:29:34 sparta kernel: #4 0xffffffff810891ff at trap_pfault+0x4f Feb 23 17:29:34 sparta kernel: #5 0xffffffff8108885d at trap+0x27d Feb 23 17:29:34 sparta kernel: #6 0xffffffff8105ffc8 at calltrap+0x8 Feb 23 17:29:34 sparta kernel: #7 0xffffffff80d4c676 at rtsock_routemsg+0x1= f6 Feb 23 17:29:34 sparta kernel: #8 0xffffffff80e12967 at defrouter_select_fib+0x507 Feb 23 17:29:34 sparta kernel: #9 0xffffffff80e104de at nd6_ra_input+0x76e Feb 23 17:29:34 sparta kernel: #10 0xffffffff80de5389 at icmp6_input+0x699 Feb 23 17:29:34 sparta kernel: #11 0xffffffff80dfdc0a at ip6_input+0xb3a Feb 23 17:29:34 sparta kernel: #12 0xffffffff80d3e56a at netisr_dispatch_src+0xca Feb 23 17:29:34 sparta kernel: #13 0xffffffff80d22d28 at ether_demux+0x148 Feb 23 17:29:34 sparta kernel: #14 0xffffffff80d240ac at ether_nh_input+0x3= 4c Feb 23 17:29:34 sparta kernel: #15 0xffffffff80d3e56a at netisr_dispatch_src+0xca Feb 23 17:29:34 sparta kernel: #16 0xffffffff80d23179 at ether_input+0x69 Feb 23 17:29:34 sparta kernel: #17 0xffffffff80d3ab72 at iflib_rxeof+0xb12 Feb 23 17:29:34 sparta kernel: Uptime: 1m57s Feb 23 17:29:34 sparta kernel: Dumping 2146 out of 65359 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..91%---<<BOOT>>--- panic is reproductible at will (tried it several times with the same outcom= e). Test machine is dual-stack IPv4/v6, with static addrs : root@sparta:/var/crash # cat /etc/rc.conf hostname=3D"sparta" ifconfig_em0=3D"inet 192.168.1.1 netmask 255.255.255.0" defaultrouter=3D"192.168.1.254" ifconfig_em0_ipv6=3D"inet6 accept_rtadv xxxx:xxx:xxxx:1::2:1/64" ipv6_defaultrouter=3D"xxxx:xxx:xxxx:1::ffff" rtsold_enable=3D"YES" [...] I'll attach the core.txt a.s.a.p., and will keep the vmcore files for some = time in case you'll need them. Please let me know if there is any more details needed, or actions I can perform to provide additional details. Kind regards. -- Fred --=20 You are receiving this mail because: You are the assignee for the bug.=
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