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** Changed in: linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1708222
Title:
Long, multi-threaded compilations, segfault in Ryzen
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have a Ryzen 1700X on a MSI B350 Motherboard and 64 Gb of RAM
(Corsair LPX 2400). If I do a very intensive multi-threaded
compilation session sometimes I get a segfault. This seems to be a
problem with Ryzen it self nad maybe it is related to the bug
described in bug #1690085 but I believe it is not the same. This bug
affects many Linux users with Ryzen, see for example this thread in
the AMD forum:
https://community.amd.com/thread/215773?start=0&tstart=0 or the Gentoo
Wiki that talks about this problem in the Troubleshoting section of
their Ryzen page: https://wiki.gentoo.org/wiki/Ryzen#Troubleshooting
It is also very easy to verify if you have a processor with the
problem. Fortunately some smart people have created a simple script
that always shows the problem in my system and in the systems of the
other people of the thread. The script can be found in
https://github.com/suaefar/ryzen-test
You just have to clone the repository using git, move to the ryzen-
test directory and run ./kill_ryzen.sh. It is a very simple script, it
downloads gcc-7.1 source code into a vram disk and start #processors
simultaneous compilation of it. If any compilation fails it writes a
message in the console saying how long it took to get the failure.
After a few minutes, the build in my system fails unless I turn off
SMT. With SMT off it can take many hours, but still fails in less than
one day.
I am opening this bug report because I believe we should try to verify
if this is a widespread problem and inform potential users of the
problems. Hopefully AMD or the Kernel developers can find a
workaround. I have also already opened a bug report in the Linux
Kernel Bugzilla (https://bugzilla.kernel.org/show_bug.cgi?id=196481),
but unfortunately it is not calling the attention of the kernel
developers.
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