Dnsmasq crashes, watchdog fails to restart it

[dave14305]

I didn't try it with the dhcp-optsfile option removed, didn't see that post.

Thanks for being a good sport and running all these tests. Feels like we’re stuck as far as the debug goes.

When it is convenient, please do comment out the dhcp-optsfile line and see how it goes.

 

[alan6854321]

When it is convenient, please do comment out the dhcp-optsfile line and see how it goes.

Ok, I tried it, but now I'm losing the plot somewhat.

I edited "/jffs/configs/dnsmasq.conf.add" and commented out the "dhcp-optsfile" line.

Then I ran "killall dnsmasq; dnsmasq -d --log-debug --log-async" and ran "killall -SIGHUP dnsmasq" from another window.

This time, it didn't crash, but it still loaded the 'dhcp-optsfile' file.

dnsmasq: read /etc/hosts - 24 names
dnsmasq: read /jffs/addons/YazDHCP.d/.hostnames - 34 names
dnsmasq-dhcp: read /jffs/addons/YazDHCP.d/.staticlist
dnsmasq-dhcp: read /jffs/addons/YazDHCP.d/.optionslist
dnsmasq: using nameserver 208.67.222.222#53
dnsmasq: using nameserver 208.67.220.220#53
dnsmasq: using only locally-known addresses for local
dnsmasq: using nameserver 208.67.222.222#53
dnsmasq: using nameserver 208.67.220.220#53
dnsmasq: using only locally-known addresses for local

So then I removed the comment (i.e. put dhcp-optsfile back) and tried again and it no longer crashes. Don't know what's going on.

 

[dave14305]

Ok, I tried it, but now I'm losing the plot somewhat.

I edited "/jffs/configs/dnsmasq.conf.add" and commented out the "dhcp-optsfile" line.

Then I ran "killall dnsmasq; dnsmasq -d --log-debug --log-async" and ran "killall -SIGHUP dnsmasq" from another window.

This time, it didn't crash, but it still loaded the 'dhcp-optsfile' file.

dnsmasq: read /etc/hosts - 24 names
dnsmasq: read /jffs/addons/YazDHCP.d/.hostnames - 34 names
dnsmasq-dhcp: read /jffs/addons/YazDHCP.d/.staticlist
dnsmasq-dhcp: read /jffs/addons/YazDHCP.d/.optionslist
dnsmasq: using nameserver 208.67.222.222#53
dnsmasq: using nameserver 208.67.220.220#53
dnsmasq: using only locally-known addresses for local
dnsmasq: using nameserver 208.67.222.222#53
dnsmasq: using nameserver 208.67.220.220#53
dnsmasq: using only locally-known addresses for local

So then I removed the comment (i.e. put dhcp-optsfile back) and tried again and it no longer crashes. Don't know what's going on.

Sorry. Let’s try it this way:

1. Comment out the line again.
2. run service restart_dnsmasq
3. run killall -SIGHUP dnsmasq

Does it crash?

 

[alan6854321]

Ok, tried that and this time it no longer reads the "dhcp-optsfile", but doesn't crash either.

cat /jffs/configs/dnsmasq.conf.add

addn-hosts=/jffs/addons/YazDHCP.d/.hostnames # YazDHCP_hostnames
dhcp-hostsfile=/jffs/addons/YazDHCP.d/.staticlist # YazDHCP_staticlist
### dhcp-optsfile=/jffs/addons/YazDHCP.d/.optionslist # YazDHCP_optionslist


26-Feb 16:53:14 AX dnsmasq[26990]: read /etc/hosts - 24 names
26-Feb 16:53:14 AX dnsmasq[26990]: read /jffs/addons/YazDHCP.d/.hostnames - 34 names
26-Feb 16:53:14 AX dnsmasq-dhcp[26990]: read /jffs/addons/YazDHCP.d/.staticlist
26-Feb 16:53:14 AX dnsmasq[26990]: using nameserver 208.67.222.222#53
26-Feb 16:53:14 AX dnsmasq[26990]: using nameserver 208.67.220.220#53
26-Feb 16:53:14 AX dnsmasq[26990]: using only locally-known addresses for local
26-Feb 16:53:14 AX dnsmasq[26990]: using nameserver 208.67.222.222#53
26-Feb 16:53:14 AX dnsmasq[26990]: using nameserver 208.67.220.220#53
26-Feb 16:53:14 AX dnsmasq[26990]: using only locally-known addresses for local

But then I put it back the way it was and it still doesn't crash???

cat /jffs/configs/dnsmasq.conf.add

addn-hosts=/jffs/addons/YazDHCP.d/.hostnames # YazDHCP_hostnames
dhcp-hostsfile=/jffs/addons/YazDHCP.d/.staticlist # YazDHCP_staticlist
dhcp-optsfile=/jffs/addons/YazDHCP.d/.optionslist # YazDHCP_optionslist


26-Feb 16:54:31 AX dnsmasq[27909]: read /etc/hosts - 24 names
26-Feb 16:54:31 AX dnsmasq[27909]: read /jffs/addons/YazDHCP.d/.hostnames - 34 names
26-Feb 16:54:31 AX dnsmasq-dhcp[27909]: read /jffs/addons/YazDHCP.d/.staticlist
26-Feb 16:54:31 AX dnsmasq-dhcp[27909]: read /jffs/addons/YazDHCP.d/.optionslist
26-Feb 16:54:31 AX dnsmasq[27909]: using nameserver 208.67.222.222#53
26-Feb 16:54:31 AX dnsmasq[27909]: using nameserver 208.67.220.220#53
26-Feb 16:54:31 AX dnsmasq[27909]: using only locally-known addresses for local
26-Feb 16:54:31 AX dnsmasq[27909]: using nameserver 208.67.222.222#53
26-Feb 16:54:31 AX dnsmasq[27909]: using nameserver 208.67.220.220#53
26-Feb 16:54:31 AX dnsmasq[27909]: using only locally-known addresses for local

 

[dave14305]

Ok, tried that and this time it no longer reads the "dhcp-optsfile", but doesn't crash either.

But then I put it back the way it was and it still doesn't crash???

Run the killall SIGHUP a couple times in a row to be certain.

 

[alan6854321]

Run the killall SIGHUP a couple times in a row to be certain.

Tried it multiple times, it just won't crash anymore.

 

[alan6854321]

I might have got my router into a strange state...

I was sensible enough to save the jffs & config before starting all these experiments.
I'll probably do a factory reset and restore it to it's former glory this evening.

 

[alan6854321]

Well, my AX86S died - jffs failed, loads of jffs2 checksum errors and it just crashed after a hard reset and restore attempt.

So - now I'm the proud owner of an AX88U_Pro.
dnsmasq still crashes when the WAN goes down, but now it gives a potentially unexpected fatal signal 6, instead of 11.

10-Mar 07:54:44 AX custom_script: Running /jffs/scripts/wan-event (args: 0 disconnected)
10-Mar 07:54:44 AX dnsmasq[3524]: read /etc/hosts - 24 names
10-Mar 07:54:44 AX dnsmasq[3524]: read /jffs/addons/YazDHCP.d/.hostnames - 34 names
10-Mar 07:54:44 AX custom_script: Running /jffs/scripts/wan-event (args: 0 stopped)
10-Mar 07:54:44 AX kernel: potentially unexpected fatal signal 6.
10-Mar 07:54:44 AX kernel: CPU: 0 PID: 3524 Comm: dnsmasq Tainted: P           O      4.19.183 #1
10-Mar 07:54:44 AX kernel: Hardware name: RTAX88U_PRO (DT)
10-Mar 07:54:44 AX kernel: pstate: 00070010 (nzcv q A32 LE aif)
10-Mar 07:54:44 AX kernel: pc : 00000000f78f33a4
10-Mar 07:54:44 AX kernel: lr : 00000000ffc00b80
10-Mar 07:54:44 AX kernel: sp : 00000000ffc00b80
10-Mar 07:54:44 AX kernel: x12: 0000000000000000
10-Mar 07:54:44 AX kernel: x11: 00000000ffc00e10 x10: 00000000f79e9de0
10-Mar 07:54:44 AX kernel: x9 : 0000000000000002 x8 : 0000000000000001
10-Mar 07:54:44 AX kernel: x7 : 00000000000000af x6 : 00000000ffc00dc0
10-Mar 07:54:44 AX kernel: x5 : 00000000ffc00dc0 x4 : 0000000000000006
10-Mar 07:54:44 AX kernel: x3 : 0000000000000008 x2 : 0000000000000000
10-Mar 07:54:44 AX kernel: x1 : 00000000ffc00b80 x0 : 0000000000000000