Created attachment 306057 [details] dmesg of the broken 6.6.23 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. With 6.6.22 and earlier, hibernate works ok. When I rebuilt 6.6.23 with the previous linux-6.6.22/kernel/workqueue.c, hibernating works again.
Could you please bisect which of the changes that modified that file broke things? And check if mainline is affected as well? This guide explains the steps: https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html When actually doing the regression, you can limit the range to changes to that modified said file like this: git bisect start -- kernel/workqueue.c
Thank you for your answer. 5a70baec2294e8a7d0fcc4558741c23e752dad5c is the first bad commit commit 5a70baec2294e8a7d0fcc4558741c23e752dad5c Author: Tejun Heo <tj@kernel.org> Date: Mon Jan 29 08:11:25 2024 -1000 workqueue: Implement system-wide nr_active enforcement for unbound workqueues I also tried mainline (6.9.0-rc2) but it couldn't even mount the root fs for some reason. Probably .config would have needed some work.
Created attachment 306076 [details] bisection log
Could you please give 6.6.24-rc1 a quick try; there was a workqueue change missing that might or might not be related: https://lore.kernel.org/all/20240401152547.867452742@linuxfoundation.org/
6.6.24-rc1 did not fix this problem.
When I revert commit 5a70baec2294e8a7d0fcc4558741c23e752dad5c from 6.6.24-rc1, hibernating and waking up work again.
Forwarded by mail: https://lore.kernel.org/all/ce4c2f67-c298-48a0-87a3-f933d646c73b@leemhuis.info/