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Date: Fri, 10 Feb 2023 01:39:01 +0100 From: Frederic Weisbecker <frederic@...nel.org> To: Zqiang <qiang1.zhang@...el.com>, Nicholas Piggin <npiggin@...il.com> Cc: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, paulmck@...nel.org, joel@...lfernandes.org, rcu@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v2] sched/isolation: Fix illegal CPU value by housekeeping_any_cpu() return Thanks for checking this! On Fri, Feb 10, 2023 at 08:00:21AM +0800, Zqiang wrote: > For kernels built with CONFIG_NO_HZ_FULL=y, running the following tests: > > runqemu kvm slirp nographic qemuparams="-m 1024 -smp 4" bootparams= > "console=ttyS0 nohz_full=0,1 rcu_nocbs=0,1 sched_verbose" -d Has this ever worked? Again I'm tempted to just: git revert 08ae95f4fd3b38b257f5dc7e6507e071c27ba0d5 > > root@...ux86-64:~# echo 0 > /sys/devices/system/cpu/cpu2/online > root@...ux86-64:~# echo 0 > /sys/devices/system/cpu/cpu3/online > > [ 22.838290] BUG: unable to handle page fault for address: ffffffff84cd48c0
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