[RT-AC3200 384.13-2] dnsmasq - out of space/no resolution

[Nigel Jones]

This morning I noticed I wasn't able to reach many web sites on my phone. same on pc. some recently used sites ok. Checked my router, and noted errors :

Jan 29 08:31:38 dnsmasq-dhcp[285]: failed to write /var/lib/misc/dnsmasq.leases: No space left on device (retry in 60s)
Jan 29 08:31:45 dnsmasq[285]: failed to allocate 328 bytes
Jan 29 08:31:45 dnsmasq[285]: failed to allocate 328 bytes

I am using dns over tls to google.

Also
nigel@RT-AC3200-AD90:/tmp/home/root# ps w | grep dns
285 nobody 3352 S dnsmasq --log-async
nigel@RT-AC3200-AD90:/tmp/home/root# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 31872 31872 0 100% /
devtmpfs 127576 0 127576 0% /dev
tmpfs 127716 1876 125840 1% /tmp
/dev/mtdblock4 65536 13144 52392 20% /jffs
/dev/sda1 3845677072 986188224 2664139704 27% /tmp/mnt/PLANETF1
/dev/root 31872 31872 0 100% /usr/sbin/tc


Although I didn't capture it, the GUI was showing around 50% mem used, and this was confirmed by looking at /proc/meminfo.

The filesystem did seem full up - in fact even after a reboot it's really full - so not sure if I can do something there, perhaps getting dnsmasq to write leases elsewhere -- though if it's already got a file written I doubt it would get into another block to cause a write issue.

The memory allocation failure is odd.

I could switch over dns over tls, configure clients instead, perhaps try the 3200 alpha build - though the release notes don't indicate much changed (shame no new GPL code :-( )

My initial thought is to change the lease location to somewhere under /jffs? ie change default
#dhcp-leasefile=/var/lib/misc/dnsmasq.leases


Anyone else noticed this?

 

[ColinTaylor]

This error has been reported many times over the years. It's not a dnsmasq problem per se but just an indication that you have run out of free memory. The /var filesystem is held in memory.