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Date: Fri, 24 Apr 2020 10:10:59 +0200 From: Giovanni Gherdovich <ggherdovich@...e.cz> To: Rui Salvaterra <rsalvaterra@...il.com>, x86@...nel.org Cc: linux-kernel@...r.kernel.org Subject: Re: [BISECTED] bug/regression, x86-64: completely unbootable machine On Fri, 2020-04-24 at 09:00 +0100, Rui Salvaterra wrote: > Hi, everyone, > > Starting with Linux 5.7-rc1, my Arrandale (Core i3-380M) laptop is > completely unbootable (the last messages on screen are GRUB's loading > kernel/initramfs). I was hoping someone would have noticed it before > 5.7-rc2 had been tagged, but alas. Anyway, I bisected it down to > commit 1567c3e3467cddeb019a7b53ec632f834b6a9239 (x86, sched: Add > support for frequency invariance). After reverting it, the machine > boots again, obviously. > > Let me know if you need any further info in order to fix this issue. > > Complete bisection log follows. > [...] Hello Rui, thanks for the report. The problem you encountered is due to a bug where the code doesn't work on machines with less than 4 physical CPU cores. It is fixed by this patch series: https://lore.kernel.org/lkml/20200416054745.740-1-ggherdovich@suse.cz/ The series has been merged in the branch sched/urgent of the "tip" tree (https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git), the commit fixing the bug you observed is 23ccee22e834 (x86, sched: Account for CPUs with less than 4 cores in freq. invariance), and will be merged in Linus' tree at some point. Thanks, Giovanni Gherdovich
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