linux-kernel - Re: [PATCH v3] freezer, sched: report the frozen task stat as 'D'

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Z2H3RwMxuRd350G6@google.com>
Date: Tue, 17 Dec 2024 22:12:23 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Chen Ridong <chenridong@...weicloud.com>
Cc: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, tj@...nel.org, mkoutny@...e.com,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	chenridong@...wei.com, wangweiyang2@...wei.com
Subject: Re: [PATCH v3] freezer, sched: report the frozen task stat as 'D'

On Tue, Dec 17, 2024 at 12:48:18AM +0000, Chen Ridong wrote:
> From: Chen Ridong <chenridong@...wei.com>
> 
> Before the commit f5d39b020809 ("freezer,sched: Rewrite core freezer
> logic"), the frozen task stat was reported as 'D' in cgroup v1.
> However, after rewriting core freezer logic, the frozen task stat is
> reported as 'R'. This is confusing, especially when a task with stat of
> 'S' is frozen.
> 
> This can be reproduced as bellow step:
> cd /sys/fs/cgroup/freezer/
> mkdir test
> sleep 1000 &
> [1] 739         // task whose stat is 'S'
> echo 739 > test/cgroup.procs
> echo FROZEN > test/freezer.state
> ps -aux | grep 739
> root     739  0.1  0.0   8376  1812 pts/0    R    10:56   0:00 sleep 1000
> 
> As shown above, a task whose stat is 'S' was changed to 'R' when it was
> frozen. To solve this issue, simply maintain the same reported state as
> before the rewrite.
> 
> Fixes: f5d39b020809 ("freezer,sched: Rewrite core freezer logic")
> Signed-off-by: Chen Ridong <chenridong@...wei.com>
> Acked-by: Tejun Heo <tj@...nel.org>

Acked-by: Roman Gushchin <roman.gushchin@...ux.dev>

Thank you!