Re: [Dnsmasq-discuss] dnsmasq DHCP server crash on latest FreshTomato router firmware

Fri, 28 Mar 2025 11:12:14 -0700

Definitely looks like a real bug. The logs from the SIGSEGV event are, unfortunately, pretty useless.
The best possible information you could provide is a way that someone else could reproduce the bug on demand. I guess that's going to be difficult in this case, but it might be possible. If you turn on the dnsmasq --log-queries option, it might turn out that it's the same query and reply each time, so that's worth doing. 



The next best possible situation is that you can reproduce the bug on 
demand, and it looks like we have that. If you can trigger the bug and 
gather information, that's really useful. The first thing is setting
--log-queries, as described above. If that doesn't get us to the bug, 
the next stage is to compile dnsmasq with debugging symbols and run it 
under gdb.  Let me know if you need education on how to do that and I'll 
work you through it off-list.



Cheers,

Simon.

On 28/03/2025 14:03, ABC DEF wrote:

It's not a glitch it's a bug.


dnsmasq-bdce03f-v2.92test1 (started about 01:00:00):
/.../

Mar 28 07:48:01 router daemon.warn dnsmasq[11494]: Insecure DS reply 
received for 168.192.in-addr.arpa, check domain configuration and 
upstream DNS server DNSSEC support
Mar 28 07:49:31 router kern.warn kernel: dnsmasq/11494: potentially 
unexpected fatal signal 11.

Mar 28 07:49:31 router kern.warn kernel: Pid: 11494, comm: dnsmasq

Mar 28 07:49:31 router kern.warn kernel: CPU: 0 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 07:49:31 router kern.warn kernel: PC is at 0x2e404
Mar 28 07:49:31 router kern.warn kernel: LR is at 0x92c18

Mar 28 07:49:31 router kern.warn kernel: pc : [<0002e404>] lr : 
[<00092c18>] psr: 00000010
Mar 28 07:49:31 router kern.warn kernel: sp : bedd1a60 ip : 00028a24 
fp : 00000012
Mar 28 07:49:31 router kern.warn kernel: r10: 00000000 r9 : bedd1a9c 
r8 : 00091e3c
Mar 28 07:49:31 router kern.warn kernel: r7 : 00091e3c r6 : 00000000 
r5 : 00095f20 r4 : 00871948
Mar 28 07:49:31 router kern.warn kernel: r3 : 00092c18 r2 : 4012f008 
r1 : 4012f008 r0 : 746e656e
Mar 28 07:49:31 router kern.warn kernel: Flags: nzcv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 07:49:31 router kern.warn kernel: Control: 10c53c7d Table: 
8ddbc04a DAC: 00000015
Mar 28 07:58:04 router daemon.err mdu[11008]: libcurl error (6) - Could 
not resolve host: ident.me.


(dnsmasq restart)
/.../

Mar 28 09:08:28 router daemon.info dnsmasq-dhcp[5052]: DHCPREQUEST(br0) 
192.168.1.2 XX:XX
Mar 28 09:08:28 router daemon.info dnsmasq-dhcp[5052]: DHCPACK(br0) 
192.168.1.2 XX:XX MacBook
Mar 28 09:12:27 router kern.warn kernel: dnsmasq/29679: potentially 
unexpected fatal signal 11.

Mar 28 09:12:27 router kern.warn kernel: Pid: 29679, comm: dnsmasq

Mar 28 09:12:27 router kern.warn kernel: CPU: 0 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:12:27 router kern.warn kernel: PC is at 0x2a93c
Mar 28 09:12:27 router kern.warn kernel: LR is at 0x4bd24

Mar 28 09:12:27 router kern.warn kernel: pc : [<0002a93c>] lr : 
[<0004bd24>] psr: 20000010
Mar 28 09:12:27 router kern.warn kernel: sp : beffaa30 ip : 00000080 
fp : 400be18c
Mar 28 09:12:27 router kern.warn kernel: r10: 6c62756f r9 : 0088977a 
r8 : 00889778
Mar 28 09:12:27 router kern.warn kernel: r7 : 00091e3c r6 : 6c62756f 
r5 : 00093830 r4 : 00040000
Mar 28 09:12:27 router kern.warn kernel: r3 : 402b4008 r2 : 00000000 
r1 : 008897a2 r0 : 400be18c
Mar 28 09:12:27 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:12:27 router kern.warn kernel: Control: 10c53c7d Table: 
8ddec04a DAC: 00000015
Mar 28 09:12:27 router daemon.warn dnsmasq[5052]: TCP helper process 
29679 died unexpectedly
Mar 28 09:12:27 router kern.warn kernel: dnsmasq/29692: potentially 
unexpected fatal signal 11.

Mar 28 09:12:27 router kern.warn kernel: Pid: 29692, comm: dnsmasq

Mar 28 09:12:27 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:12:27 router kern.warn kernel: PC is at 0x2a93c
Mar 28 09:12:27 router kern.warn kernel: LR is at 0x4bd24

Mar 28 09:12:27 router kern.warn kernel: pc : [<0002a93c>] lr : 
[<0004bd24>] psr: 20000010
Mar 28 09:12:27 router kern.warn kernel: sp : beffaa30 ip : 00000080 
fp : 400be18c
Mar 28 09:12:27 router kern.warn kernel: r10: 6c62756f r9 : 0088977a 
r8 : 00889778
Mar 28 09:12:27 router kern.warn kernel: r7 : 00091e3c r6 : 6c62756f 
r5 : 00093830 r4 : 00040000
Mar 28 09:12:27 router kern.warn kernel: r3 : 402b4008 r2 : 00000000 
r1 : 008897a2 r0 : 400be18c
Mar 28 09:12:27 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:12:27 router kern.warn kernel: Control: 10c53c7d Table: 
8ddec04a DAC: 00000015
Mar 28 09:12:27 router daemon.warn dnsmasq[5052]: TCP helper process 
29692 died unexpectedly
Mar 28 09:12:27 router kern.warn kernel: dnsmasq/5052: potentially 
unexpected fatal signal 11.

Mar 28 09:12:27 router kern.warn kernel: Pid: 5052, comm: dnsmasq

Mar 28 09:12:27 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:12:27 router kern.warn kernel: PC is at 0x2e404
Mar 28 09:12:27 router kern.warn kernel: LR is at 0x92c18

Mar 28 09:12:27 router kern.warn kernel: pc : [<0002e404>] lr : 
[<00092c18>] psr: 00000010
Mar 28 09:12:27 router kern.warn kernel: sp : beffaaf0 ip : 00021794 
fp : 0000000e
Mar 28 09:12:27 router kern.warn kernel: r10: 00000000 r9 : beffab2c 
r8 : 00091e3c
Mar 28 09:12:27 router kern.warn kernel: r7 : 00091e3c r6 : 00000000 
r5 : 00095f20 r4 : 00870f60
Mar 28 09:12:27 router kern.warn kernel: r3 : 00092c18 r2 : 402b4008 
r1 : 402b4008 r0 : 6c62756f
Mar 28 09:12:27 router kern.warn kernel: Flags: nzcv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:12:27 router kern.warn kernel: Control: 10c53c7d Table: 
8dee804a DAC: 00000015


(dnsmasq restart)
/.../

Mar 28 09:18:41 router daemon.warn dnsmasq[30243]: TCP helper process 
722 died unexpectedly
Mar 28 09:18:41 router daemon.warn dnsmasq[30243]: TCP helper process 
717 died unexpectedly
Mar 28 09:18:41 router kern.warn kernel: dnsmasq/713: potentially 
unexpected fatal signal 11.
Mar 28 09:18:41 router kern.warn kernel: dnsmasq/722: potentially 
unexpected fatal signal 11.

Mar 28 09:18:41 router kern.warn kernel: Pid: 722, comm: dnsmasq

Mar 28 09:18:41 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:18:41 router kern.warn kernel: PC is at 0x2a93c
Mar 28 09:18:41 router kern.warn kernel: LR is at 0x4bd24

Mar 28 09:18:41 router kern.warn kernel: pc : [<0002a93c>] lr : 
[<0004bd24>] psr: 20000010
Mar 28 09:18:42 router kern.warn kernel: sp : becc2a30 ip : 00010000 
fp : 400d944c
Mar 28 09:18:42 router kern.warn kernel: r10: 666f2e73 r9 : 0088526a 
r8 : 00885268
Mar 28 09:18:42 router kern.warn kernel: r7 : 00091e3c r6 : 666f2e73 
r5 : 00093830 r4 : 00040000
Mar 28 09:18:42 router kern.warn kernel: r3 : 40281008 r2 : 00000000 
r1 : 0088526a r0 : 400d944c
Mar 28 09:18:42 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:18:42 router kern.warn kernel: Control: 10c53c7d Table: 
8dda804a DAC: 00000015
Mar 28 09:18:42 router kern.warn kernel: dnsmasq/717: potentially 
unexpected fatal signal 11.

Mar 28 09:18:42 router kern.warn kernel: Pid: 717, comm: dnsmasq

Mar 28 09:18:42 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:18:42 router kern.warn kernel: PC is at 0x2a93c
Mar 28 09:18:42 router kern.warn kernel: LR is at 0x4bd24

Mar 28 09:18:42 router kern.warn kernel: pc : [<0002a93c>] lr : 
[<0004bd24>] psr: 20000010
Mar 28 09:18:42 router kern.warn kernel: sp : becc2a30 ip : 00010000 
fp : 400d944c
Mar 28 09:18:42 router kern.warn kernel: r10: 666f2e73 r9 : 0088526a 
r8 : 00885268
Mar 28 09:18:42 router kern.warn kernel: r7 : 00091e3c r6 : 666f2e73 
r5 : 00093830 r4 : 00040000
Mar 28 09:18:42 router kern.warn kernel: r3 : 40281008 r2 : 00000000 
r1 : 0088526a r0 : 400d944c
Mar 28 09:18:42 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:18:42 router kern.warn kernel: Control: 10c53c7d Table: 
8f13804a DAC: 00000015

Mar 28 09:18:42 router kern.warn kernel: Pid: 713, comm: dnsmasq

Mar 28 09:18:42 router kern.warn kernel: CPU: 0 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:18:42 router kern.warn kernel: PC is at 0x2a93c
Mar 28 09:18:42 router kern.warn kernel: LR is at 0x4bd24

Mar 28 09:18:42 router kern.warn kernel: pc : [<0002a93c>] lr : 
[<0004bd24>] psr: 20000010
Mar 28 09:18:42 router kern.warn kernel: sp : becc2a30 ip : 00010000 
fp : 400d944c
Mar 28 09:18:42 router kern.warn kernel: dnsmasq/30243: potentially 
unexpected fatal signal 11.

Mar 28 09:18:42 router kern.warn kernel: Pid: 30243, comm: dnsmasq

Mar 28 09:18:42 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 09:18:42 router kern.warn kernel: PC is at 0x2e404
Mar 28 09:18:42 router kern.warn kernel: LR is at 0x92c18

Mar 28 09:18:42 router kern.warn kernel: pc : [<0002e404>] lr : 
[<00092c18>] psr: 00000010
Mar 28 09:18:42 router kern.warn kernel: sp : becc2af0 ip : 00029e52 
fp : 0000000e
Mar 28 09:18:42 router kern.warn kernel: r10: 00000000 r9 : becc2b2c 
r8 : 00091e3c
Mar 28 09:18:42 router kern.warn kernel: r7 : 00091e3c r6 : 00000000 
r5 : 00095f20 r4 : 00870f70
Mar 28 09:18:42 router kern.warn kernel: r3 : 00092c18 r2 : 40281008 
r1 : 40281008 r0 : 666f2e73
Mar 28 09:18:42 router kern.warn kernel: Flags: nzcv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:18:42 router kern.warn kernel: Control: 10c53c7d Table: 
8de7c04a DAC: 00000015
Mar 28 09:18:42 router kern.warn kernel: r10: 666f2e73 r9 : 0088526a 
r8 : 00885268
Mar 28 09:18:42 router kern.warn kernel: r7 : 00091e3c r6 : 666f2e73 
r5 : 00093830 r4 : 00040000
Mar 28 09:18:42 router kern.warn kernel: r3 : 40281008 r2 : 00000000 
r1 : 0088526a r0 : 400d944c
Mar 28 09:18:42 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 09:18:42 router kern.warn kernel: Control: 10c53c7d Table: 
8f36804a DAC: 00000015


Downgrade to dnsmasq-581c201:
/.../

Mar 28 10:50:09 router daemon.warn dnsmasq[3391]: Insecure DS reply 
received for 168.192.in-addr.arpa, check domain configuration and 
upstream DNS server DNSSEC support
Mar 28 10:59:23 router kern.warn kernel: dnsmasq/31937: potentially 
unexpected fatal signal 11.

Mar 28 10:59:23 router kern.warn kernel: Pid: 31937, comm: dnsmasq

Mar 28 10:59:23 router kern.warn kernel: CPU: 0 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 10:59:23 router kern.warn kernel: PC is at 0x2a884

Mar 28 10:59:23 router daemon.warn dnsmasq[3391]: TCP helper process 
31939 died unexpectedly

Mar 28 10:59:24 router kern.warn kernel: LR is at 0x4b8b4

Mar 28 10:59:24 router kern.warn kernel: dnsmasq/31939: potentially 
unexpected fatal signal 11.

Mar 28 10:59:24 router kern.warn kernel: Pid: 31939, comm: dnsmasq

Mar 28 10:59:24 router daemon.warn dnsmasq[3391]: TCP helper process 
31937 died unexpectedly
Mar 28 10:59:24 router kern.warn kernel: CPU: 1 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 10:59:24 router kern.warn kernel: PC is at 0x2a884
Mar 28 10:59:24 router kern.warn kernel: LR is at 0x4b8b4

Mar 28 10:59:24 router kern.warn kernel: pc : [<0002a884>] lr : 
[<0004b8b4>] psr: 20000010
Mar 28 10:59:24 router kern.warn kernel: sp : bebc5a30 ip : 00010000 
fp : 40326398
Mar 28 10:59:24 router kern.warn kernel: r10: 666f2e73 r9 : 0088a8aa 
r8 : 0088a8a8
Mar 28 10:59:24 router kern.warn kernel: r7 : 00091e3c r6 : 666f2e73 
r5 : 00093828 r4 : 00040000
Mar 28 10:59:24 router kern.warn kernel: r3 : 4023a008 r2 : 00000000 
r1 : 0088a8aa r0 : 40326398
Mar 28 10:59:24 router kern.warn kernel: Flags: nzCv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 10:59:24 router kern.warn kernel: Control: 10c53c7d Table: 
8de3c04a DAC: 00000015
Mar 28 10:59:24 router kern.warn kernel: pc : [<0002a884>] lr : 
[<0004b8b4>] psr: 20000010
Mar 28 10:59:24 router kern.warn kernel: CPU: 0 Tainted: P 
(2.6.36.4brcmarm #2)

Mar 28 10:59:24 router kern.warn kernel: PC is at 0x2e350
Mar 28 10:59:24 router kern.warn kernel: LR is at 0x92c18

Mar 28 10:59:24 router kern.warn kernel: pc : [<0002e350>] lr : 
[<00092c18>] psr: 00000010
Mar 28 10:59:24 router kern.warn kernel: sp : bebc5af0 ip : 00029e52 
fp : 0000000e
Mar 28 10:59:24 router kern.warn kernel: r10: 00000000 r9 : bebc5b2c 
r8 : 00091e3c
Mar 28 10:59:24 router kern.warn kernel: r7 : 00091e3c r6 : 00000000 
r5 : 00095f18 r4 : 008702c8
Mar 28 10:59:24 router kern.warn kernel: r3 : 00092c18 r2 : 4023a008 
r1 : 4023a008 r0 : 666f2e73
Mar 28 10:59:24 router kern.warn kernel: Flags: nzcv IRQs on FIQs on 
Mode USER_32 ISA ARM Segment user
Mar 28 10:59:24 router kern.warn kernel: Control: 10c53c7d Table: 
8df5004a DAC: 00000015


(dnsmasq restart)
/.../

Mar 28 11:04:18 router daemon.notice stubby[1995]: Stubby version: 
Stubby 0.4.3
Mar 28 11:04:20 router daemon.info dnsmasq[2005]: started, version 
cachesize 8192
Mar 28 11:04:20 router daemon.info dnsmasq[2005]: compile time options: 
IPv6 GNU-getopt no-RTC no-DBus no-UBus no-i18n no-IDN DHCP DHCPv6 no-Lua 
TFTP no-conntrack ipset no-nftset Tomato-helper auth DNSSEC no-ID loop- 
detect inotify dumpfile

Mar 28 11:04:20 router daemon.info dnsmasq[2005]: DNSSEC validation enabled

Mar 28 11:04:20 router daemon.info dnsmasq[2005]: configured with trust 
anchor for <root> keytag 20326
Mar 28 11:04:20 router daemon.warn dnsmasq[2005]: warning: interface wg0 
does not currently exist
Mar 28 11:04:20 router daemon.warn dnsmasq[2005]: warning: interface 
tun21 does not currently exist
Mar 28 11:04:20 router daemon.warn dnsmasq[2005]: warning: ignoring 
resolv-file flag because no-resolv is set
Mar 28 11:04:20 router daemon.info dnsmasq[2005]: asynchronous logging 
enabled, queue limit is 5 messages
Mar 28 11:04:20 router daemon.info dnsmasq-dhcp[2005]: DHCP, IP range 
192.168.3.200 -- 192.168.3.254, lease time 1d
Mar 28 11:04:20 router daemon.info dnsmasq-dhcp[2005]: DHCP, IP range 
192.168.2.200 -- 192.168.2.201, lease time 1d
Mar 28 11:04:20 router daemon.info dnsmasq-dhcp[2005]: DHCP, IP range 
192.168.1.200 -- 192.168.1.254, lease time 1d
Mar 28 11:04:20 router daemon.info dnsmasq[2005]: using nameserver 
127.0.0.1#5453
Mar 28 11:04:20 router daemon.info dnsmasq[2005]: using 175481 more 
local addresses

Mar 28 11:04:22 router daemon.info dnsmasq[2005]: read /etc/hosts - 22 names

Mar 28 11:04:22 router daemon.info dnsmasq[2005]: read /etc/ 
hosts.dnsmasq - 68 names
Mar 28 11:04:22 router daemon.err dnsmasq[2011]: failed to allocate 
66573 bytes

(but still up and running)

Except of:


Mar 28 09:18:41 router daemon.warn dnsmasq[30243]: TCP helper process 
722 died unexpectedly
Mar 28 09:18:41 router daemon.warn dnsmasq[30243]: TCP helper process 
717 died unexpectedly


there is nothing in the log immediately preceding SIGSEGV.

Now I'll go back to dnsmasq-7c1212e.

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