Re: Figure out what killed an app (rhbz#2253099)

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On Mon, 2024-02-05 at 16:20 +0200, Yanko Kaneti wrote:
> On Mon, 2024-02-05 at 14:31 +0100, Florian Weimer wrote:
> > > 
> > > Running with rtkit-daemon stoped and masked prevents the main evo
> > > process being prioritized and consequently killed with higher load.
> > > 
> > > The fact that the kernel kills the (main)thread without a beep anywhere
> > > in the logs is strange to me.
> > 
> > I think it's not so unusual for the kernel not to log the SIGKILL.  This
> > does not seem to be purely an emergency measure like the OOM killer—it's
> > more like something that an application (set of processes) told the
> > kernel to do to itself.  As such, it's not unreasonable for the
> > application to do the logging.  On the other hand, I think it's
> > difficult for rtkit-daemon to arrange for that logging because it can't
> > monitor the target process directly.
> 
> Logical but leaves users like me scratching there head with mishaps like
> these. Given that print-fatal-signals kernel param (which I just learned
> about) is off by default.

FWIW, I've been running for the last couple days  with print-fatal-
signals=1 and the only additional logs I get are exactly the ones that
would've helped in this case.

kernel: RT Watchdog Timeout (hard): evolution[4604]
kernel: RT Watchdog Timeout (hard): liferea[5045]

i.e. RT watchdog kills do seem like an out-of-the-ordinary events and
there is case to be made that logging in should be on by default.

-Yanko

> 
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