[Dnsmasq-discuss] SEGV on dnsmasq 2.81

[Arjun D R]

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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