FS#4118 - logread crashes sometimes

[openwrt-bot]

bittorf:

logread is dying several times a day here.
This is with r17950 and at least ath79 and mpc85xx and ramips.

Tue Nov 2 17:12:05 2021 kern.info kernel: [ 3745.330244] do_page_fault(): sending SIGSEGV to logread for invalid write access to 00000000 Tue Nov 2 17:12:05 2021 kern.info kernel: [ 3745.338789] epc = 77de87ac in libc.so[77d60000+a5000] Tue Nov 2 17:12:05 2021 kern.info kernel: [ 3745.343833] ra = 004017b3 in logread[400000+3000]

for checking if the log-service is healthy, we do regularly:

ubus call network.device status ubus call log read logread >/dev/null

The last call has (when failing) always RC = 139 with above message in log.

[openwrt-bot]

bittorf:

the same with r18106 (after GCC11 fix).

relevant config settings are:

system.@system[0].cronloglevel='9'
system.@system[0].log_size='16'


and no memory pressure:

root@ArcherC6U-stube:~ :) free
total used free shared buff/cache available
Mem: 121680 30692 67616 3684 23372 74188
Swap: 4092 0 4092