Date: Fri, 29 Jan 2021 22:35:41 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 253087] Timeout of bufdaemon happens at shutdown time with -CURRENT amd64 and VirtulaBox VM Message-ID: <bug-253087-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253087 Bug ID: 253087 Summary: Timeout of bufdaemon happens at shutdown time with -CURRENT amd64 and VirtulaBox VM Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: yasu@utahime.org CC: kib@FreeBSD.org [Host] CPU: Intel Core i7 9700 3.00GHz OS: 64bit Windows 10 20H2 VirtualBox: 6.1.18 [VM] CPU: 4 core Mem: 8GB HDD: 100GB Since December I've been experiencing the problem that timeout of bufdaemon happens at shutdown time with -CURRENT amd64 and VirtualBox VM under above conditions. The problem happens when I login the VM and do something to cer= tain extent. For example the problem is reproducible by doing `make buildworld`. The same problem was reported by AMD Ryzen users at freebsd-current ML and = fix for the CPU was already committed. But in my case CPU is Intel and fix for = AMD Ryzen doesn't solve the problem of course. So I tried bisect of source tree= and found that following commit is the source of the problem. ---------------------------------------------------------------------- commit 84eaf2ccc6aa05da7b7389991d3023698b756e3f Author: Konstantin Belousov <kib@FreeBSD.org> Date: Mon Dec 21 19:02:31 2020 +0200 x86: stop punishing VMs with low priority for TSC timecounter I suspect that virtualization techniques improved from the time when we have to effectively disable TSC use in VM. For instance, it was report= ed (complained) in https://github.com/JuliaLang/julia/issues/38877 that FreeBSD is groundlessly slow on AWS with some loads. Remove the check and start watching for complaints. Reviewed by: emaste, grehan Discussed with: cperciva Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27629 ---------------------------------------------------------------------- I confirmed that the problem still happens with f17fc5439f517d06ac8976f53354789cde5a7427 committed at Fri Jan 29 09:34:27 2= 021 -0500 but reverting above one fixes the problem. Moreover same problem happ= ens with 40cb0344eb27e0bb9a112ff50812a7e77816d6be of stable/13 committed at Thu= Jan 28 18:59:57 2021 -0500 and and reverting above one also fixes the problem. Cc-ing the committer of 84eaf2ccc6aa05da7b7389991d3023698b756e3f --=20 You are receiving this mail because: You are the assignee for the bug.=
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