[Bug 204426] Processes terminating cannot access memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204426

--- Comment #26 from rblayzor at inoc.net ---
(In reply to Konstantin Belousov from comment #25)

I think there are two different issues maybe going on here. My original bug
report should of been more specific in that application/processes that
apparently ran fine prior to upgrading to 10.2-RELEASE suddenly seem to be core
dumping for some reason.

When these processes core dump, sometimes they are leaving good core files,
sometimes they are not. (perhaps most of the time). I'm seeing a something in
common with the bug John brought up. Usually when I see something like:

Failed to write core file for process exim (error 14)
pid 8298 (exim), uid 26: exited on signal 11


The core file is incomplete, and some of the last messages I see in the core
file is "cannot access memory", or something long those lines. We'll chalk
these up to maybe the bug he mentioned with the system not dumping these core
files. I am telling the system to drop all cores to a specific directory that
has plenty of space and is r/w.


The main problem however... I have to collect more core dumps on. (if they can
drop core successfully). I posted one previously that just happened the other
day that Timo Sirainen said should not be possible due to the output from the
backtrace.

I'm still waiting for more segfaults and still post those backtraces when they
are available.

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