Varnish child killed

Thiago Figueiro TFigueiro at
Wed Apr 27 00:26:10 CEST 2011

From: Jean-Francois Laurens

> Hi there,

> Apr 20 21:48:43 server-01-39 varnishd[21087]: Child (5372) not responding 
> to CLI, killing it.

Hi!  I'm a bit late to the discussion (happy Easter everyone!) but we came across this issue on Linux earlier this year.

You didn't send charts for your disk IO but I'm betting it looks busy.  If this is so, it may be the kernel pre-empting writing of dirty mmap pages to disk.

I investigated the issue at the time and found that on the RHEL 5 vanilla kernel the Varnish child was being blocked by kernel IO. This caused the parent pings to time-out:

echo 0 > /proc/sys/vm/flush_mmap_pages

Good luck,

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