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[141.239.158.86]) by smtp.gmail.com with ESMTPSA id j23-20020aa78d17000000b006e681769ee0sm10817731pfe.145.2024.04.02.17.38.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Apr 2024 17:38:34 -0700 (PDT) Sender: Tejun Heo Date: Tue, 2 Apr 2024 14:38:33 -1000 From: Tejun Heo To: Linux regressions mailing list Cc: Greg KH , Sasha Levin , "stable@vger.kernel.org" , LKML Subject: Re: Hibernate stuck after recent kernel/workqueue.c changes in Stable 6.6.23 Message-ID: References: Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hello, On Tue, Apr 02, 2024 at 10:08:11AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote: > Hi stable team, there is a report that the recent backport of > 5797b1c18919cd ("workqueue: Implement system-wide nr_active enforcement > for unbound workqueues") [from Tejun] to 6.6.y (as 5a70baec2294) broke > hibernate for a user. 6.6.24-rc1 did not fix this problem; reverting the > culprit does. > > > With kernel 6.6.23 hibernating usually hangs here: the display stays > > on but the mouse pointer does not move and the keyboard does not work. > > But SysRq REISUB does reboot. Sometimes it seems to hibernate: the > > computer powers down and can be waked up and the previous display comes > > visible, but it is stuck there. > > See https://bugzilla.kernel.org/show_bug.cgi?id=218658 for details. > Note, you have to use bugzilla to reach the reporter, as I sadly[1] can > not CCed them in mails like this. > > Side note: there is a mainline report about problems due to > 5797b1c18919cd ("workqueue: Implement system-wide nr_active enforcement > for unbound workqueues") as well, but it's about "nohz_full=0 prevents > kernel from booting": > https://bugzilla.kernel.org/show_bug.cgi?id=218665; will forward that > separately to Tejun. > > Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) Sorry about late reply but that commit is not for -stable. It does fix an undesirable behavior from an earlier commit, so it has the Fixes tag but it has a series of dependencies that need to be backported together which would be far too invasive for -stable, thus no Cc: stable. I didn't know a Fixes tag automatically triggers backport to -stable. I will keep that in mind for future. Thanks. -- tejun