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Date: Mon, 15 Aug 2022 16:29:24 +0530 From: Mukesh Ojha <quic_mojha@...cinc.com> To: Michal Koutný <mkoutny@...e.com>, Xuewen Yan <xuewen.yan94@...il.com> CC: Tejun Heo <tj@...nel.org>, Imran Khan <imran.f.khan@...cle.com>, <lizefan.x@...edance.com>, <hannes@...xchg.org>, <tglx@...utronix.de>, <steven.price@....com>, <peterz@...radead.org>, <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Zhao Gongyi <zhaogongyi@...wei.com>, Zhang Qiao <zhangqiao22@...wei.com> Subject: Re: Query regarding deadlock involving cgroup_threadgroup_rwsem and cpu_hotplug_lock On 8/15/2022 3:09 PM, Michal Koutný wrote: > On Mon, Aug 15, 2022 at 05:25:52PM +0800, Xuewen Yan <xuewen.yan94@...il.com> wrote: >> Your means is that the problem should be fixed by [1]+[2]'s revert ? > > I understood that was already the combination you had tested. > You write in [T] that [1] alone causes (another) deadlock and therefore > the revert of [2] was suggested. > >> I just tested the case which reverted the [2]. Need I test with [1] and [2]? > > It'd be better (unless you haven't already :-), my reasoning is for the > [1]+[2] combo. Feel free to add my Reported-and-tested-by: Mukesh Ojha <quic_mojha@...cinc.com> -Mukesh > > Thanks, > Michal > > [T] https://lore.kernel.org/r/CAB8ipk_gCLtvEahsp2DvPJf4NxRsM8WCYmmH=yTd7zQE+81_Yg@mail.gmail.com/
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