Malte Ubl wrote:
[...]
Our code is not using any specials variables though except %SIG for
alarm.
I've used $$ just as an example, any variable can be affected.
How does a variable become read-only? Is that something that can be done
on C/XS Level?
Yes. By setting the READONLY flag on the scalar. But it may happen as a
result of some bug.
You also get a readonly variable if it's not a variable but a constant, e.g.:
perl -MDevel::Peek -le 'Dump "aaa"'
SV = PV(0x804c4a0) at 0x805b88c
REFCNT = 1
FLAGS = (POK,READONLY,pPOK)
PV = 0x805e420 "aaa"\0
CUR = 3
LEN = 4
so for example if a function receives a string as an argument, e.g.,
foo("aaa") and then the function tries to modify its $_[0]'s argument you
will get this error.
If the error occurs, it seem to bubble from apache child to apache
child like an infection (Although it seems to take a pretty long time
(like 15 Minutes)). That's why I always figured that this bug must be
releated to source code that is being modified and copied to the
children.
Could it be some environment issue? running out of disk space, RAM, etc.?
RAM would be possible. We'll look into that and maybe go down with
MaxClients a little. It doesnt look like we have ever hit the SWAP though.
If you debug on the dev machine. it's important to run in the single
server mode (-X), so you will see the error as soon as it happens and not
wait through 50 or whatever the number of server you are running. see the
mod_perl guide/the practical mod_perl book for more information.
--
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