Hi Team,
We are facing a dnsmasq crash on version 2.81. We are not aware of steps to
trigger the crash, but we used to get this crash frequently.
Crash Details:
Thread 0 (crashed)
0 dnsmasq!check_dns_listeners [dnsmasq.c : 1768 + 0x0]
r0 = 0x00000000 r1 = 0x00000009 r2 = 0x00000009 r3 = 0x01dfdb80
r4 = 0x0004b550 r5 = 0x656e2e6d r6 = 0x000000c1 r7 = 0xffffffff
r8 = 0x6218f391 r9 = 0x0004b550 r10 = 0xffffffff r12 = 0x00000006
fp = 0x0004b550 sp = 0xbbb00928 lr = 0x00030483 pc = 0x00020a8a
Found by: given as instruction pointer in context
1 dnsmasq!main [dnsmasq.c : 1199 + 0x5]
r4 = 0x6218f391 r5 = 0x0004b550 r6 = 0x0004b550 r7 = 0x0004b550
r8 = 0x00032fda r9 = 0x0004b550 r10 = 0x00000000 fp = 0x0004b550
sp = 0xbbb009a0 pc = 0x00013569
Found by: call frame info
2 libc-2.31.so + 0x1a98d
r4 = 0x00031fb9 r5 = 0x00000000 r6 = 0x000137ad r7 = 0x00000000
r8 = 0x00000000 r9 = 0x00000000 r10 = 0xb3f4ffa4 fp = 0x00000000
sp = 0xbbb00aa0 pc = 0xb3e1198f
Found by: call frame info
3 libc-2.31.so + 0xd3e3a
sp = 0xbbb00aa4 pc = 0xb3ecae3c
Found by: stack scanning
4 dnsmasq + 0x260f
sp = 0xbbb00ab0 pc = 0x00012611
Found by: stack scanning
5 dnsmasq + 0x21fb7
sp = 0xbbb00abc pc = 0x00031fb9
Found by: stack scanning
Crash reason: SIGSEGV
Crash address: 0x656e2e6d
Process uptime: not available
These details are observed from a mini dump. So we were not able to extract
more from it.
Dnsmasq logs:
2022 Jan 19 06:47:13.516262 systemd[1]: Starting DNS forwarder and
DHCP server...
2022 Jan 19 06:47:13.606367 dnsmasq[31730]: started, version 2.81 cachesize 150
2022 Jan 19 06:47:13.607180 dnsmasq[31730]: compile time options: IPv6
GNU-getopt no-DBus no-UBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP
no-conntrack ipset auth no-nettlehash no-DNSSEC loop-detect no-inotify
dumpfile
2022 Jan 19 06:47:13.607239 dnsmasq[31730]: Event handler create
2022 Jan 19 06:47:13.607589 dnsmasq[31730]: reading /etc/resolv.dnsmasq
2022 Jan 19 06:47:13.607624 dnsmasq[31730]: using nameserver 192.168.1.254#53
2022 Jan 19 06:47:13.607653 dnsmasq[31730]: using nameserver
2600:1700:adc0:5720::1#53
2022 Jan 19 06:47:13.607828 dnsmasq[31730]: read /etc/hosts - 14 addresses
2022 Jan 19 06:47:13.613299 systemd[1]: Started DNS forwarder and DHCP server.
2022 Jan 19 07:04:22.857092 systemd[1]: dnsmasq.service: Main process
exited, code=killed, status=11/SEGV
2022 Jan 19 07:04:22.858999 systemd[1]: dnsmasq.service: Unit entered
failed state.
2022 Jan 19 07:04:22.859070 systemd[1]: dnsmasq.service: Failed with
result 'signal'.
2022 Jan 19 07:04:23.043088 systemd[1]: dnsmasq.service: Service
hold-off time over, scheduling restart.
2022 Jan 19 07:04:23.044660 systemd[1]: Stopped DNS forwarder and DHCP server.
Is it a known failure/bug? Could you please help?
Thanks,
Arjun
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