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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/31500] stapio exited with irqs disabled
Date: Wed, 20 Mar 2024 14:19:24 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D31500

--- Comment #5 from William Cohen <wcohen at redhat dot com> ---
On the machine that observed the problem poll_map.exp is using -g to compile
poll_map.stp. poll_map.stp uses 'kernel.function("vfs_*").call' insert kpro=
bes.
With -g mode one of the probe points it attempts to instrument is
'kernel.function("vfs_caches_init").call'.  This is an initialization funct=
ion
on a page that is freed up after initialization.  This problem appears to o=
ccur
on one particular machine.  I suspect that it might happening on other mach=
ines
for other for tests/functions.  It might be helpful to look to see if anyth=
ing
in /proc/kallsyms match up with the lower 24-bits of ffffffffa64a65c0 (4a65=
c0)
on the machine that the problem initially occurred on:

sudo cat /proc/kallsyms |grep 4a65c0

Then take a look to see if any of those functions have and __init in front =
of
the of them using the function lookup on
https://elixir.bootlin.com/linux/v6.8.1/source.

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