bug: deadlock in smp.c at on_each_cpu/smp_call_function_many

bug: deadlock in smp.c at on_each_cpu/smp_call_function_many

[Kamil Paral]

Hello,

I've experienced a kernel panic, the screenshots are here:
https://bugs.freedesktop.org/attachment.cgi?id=117026
https://bugs.freedesktop.org/attachment.cgi?id=117027

It happened with kernel-4.0.7-300.fc22.x86_64 on Fedora 22.

Originally I reported it against the radeon driver [1], but I was told that it 
seems to be a deadlock in on_each_cpu/smp_call_function_many (which seems 
to be in smp.c) and that I should report it into an appropriate mailing list. 
I'd report it to bugzilla, but I wasn't sure which product/component to 
file it against.

Please advise what steps I should take in order to have this properly
reported, or whether random panics which are not reproducible at will
are not worth reporting, because the traces don't provide enough
clues to resolve them. I have no experience in this matter, so I don't
really know.

Thanks for pointers,
Kamil Paral


[1] https://bugs.freedesktop.org/show_bug.cgi?id=91291