Date: Wed, 12 Oct 2016 18:30:09 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, svn-src-head@FreeBSD.org Subject: Re: svn commit: r306680 - in head/sys: amd64/amd64 amd64/include i386/include x86/include x86/x86 Message-ID: <ef6f7ef2-ede9-0cb6-9e70-426117654332@FreeBSD.org> In-Reply-To: <20161012134550.GX68202@kib.kiev.ua> References: <201610041701.u94H1OK3061119@repo.freebsd.org> <425655dd-ba13-8944-0f31-b1ad6666d90a@FreeBSD.org> <20161012134550.GX68202@kib.kiev.ua>
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On 12/10/2016 16:45, Konstantin Belousov wrote: > On Wed, Oct 12, 2016 at 04:25:00PM +0300, Andriy Gapon wrote: >> On 04/10/2016 20:01, Konstantin Belousov wrote: >>> Author: kib >>> Date: Tue Oct 4 17:01:24 2016 >>> New Revision: 306680 >>> URL: https://svnweb.freebsd.org/changeset/base/306680 >>> >>> Log: >>> Re-apply r306516 (by cem): >>> >>> Reduce the cost of TLB invalidation on x86 by using per-CPU completion flags >>> >>> Reduce contention during TLB invalidation operations by using a per-CPU >>> completion flag, rather than a single atomically-updated variable. >> >> Kostik, >> >> could this commit cause a problem reported in the below links? >> https://bz-attachments.freebsd.org/attachment.cgi?id=175614 >> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213371 > > If I am reading the report right, the problem appears on the > 11.0-RELEASE system. The patch you reference was only applied to HEAD a > week ago and was not merged even to stable/11. Sorry for the noise, then. Somehow I thought that this went into the release branch, but obviously there was too little time for that. > The examination must start with backtracing the thread which owns the > smp_ipi_mtx (shown on the screenshot). It looks like DDB is not in GENERIC in 11.0? Not sure if the reporter would be able to configure a dump device and then save the dump given that the panic happens in the installer. If anyone could provide them with instructions that would be great. -- Andriy Gapon
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