From: Dan Rue <dan.rue@linaro.org>
To: Shuah Khan <shuah@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Dmitry Safonov <dsafonov@virtuozzo.com>,
Borislav Petkov <bp@alien8.de>,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: selftests/x86/fsgsbase_64 test problem
Date: Fri, 26 Jan 2018 09:36:31 -0600 [thread overview]
Message-ID: <20180126153631.ha7yc33fj5uhitjo@xps> (raw)
We've noticed that fsgsbase_64 can fail intermittently with the
following error:
[RUN] ARCH_SET_GS(0x0) and clear gs, then schedule to 0x1
Before schedule, set selector to 0x1
other thread: ARCH_SET_GS(0x1) -- sel is 0x0
[FAIL] GS/BASE changed from 0x1/0x0 to 0x0/0x0
This can be reliably reproduced by running fsgsbase_64 in a loop. i.e.
for i in $(seq 1 10000); do ./fsgsbase_64 || break; done
This problem isn't new - I've reproduced it on latest mainline and every
release going back to v4.12 (I did not try earlier). This was tested on
a Supermicro board with a Xeon E3-1220 as well as an Intel Nuc with an
i3-5010U.
Thanks,
Dan
next reply other threads:[~2018-01-26 15:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-26 15:36 Dan Rue [this message]
2018-01-26 16:22 ` selftests/x86/fsgsbase_64 test problem Andy Lutomirski
2018-01-26 18:59 ` Andy Lutomirski
2018-01-26 19:46 ` Andy Lutomirski
2018-01-26 22:38 ` Andy Lutomirski
2018-01-26 22:42 ` Andy Lutomirski
2018-01-28 19:21 ` Andy Lutomirski
2018-01-29 9:13 ` H. Peter Anvin
2018-01-29 16:37 ` Andy Lutomirski
2018-01-29 18:12 ` H. Peter Anvin
2018-01-29 18:26 ` Andy Lutomirski
2018-01-29 18:30 ` H. Peter Anvin
2018-02-27 22:59 ` Dan Rue
2018-01-26 22:56 ` Borislav Petkov
2018-01-28 19:21 ` Andy Lutomirski
2018-01-26 22:51 ` H. Peter Anvin
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