This is a note to let you know that I've just added the patch titled PM: hibernate: Freeze kernel threads in software_resume() to the 5.6-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pm-hibernate-freeze-kernel-threads-in-software_resum.patch and it can be found in the queue-5.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 1471f6ab6211afc62512151a8965fb6787421b37 Author: Dexuan Cui <decui@xxxxxxxxxxxxx> Date: Thu Apr 23 20:40:16 2020 -0700 PM: hibernate: Freeze kernel threads in software_resume() commit 2351f8d295ed63393190e39c2f7c1fee1a80578f upstream. Currently the kernel threads are not frozen in software_resume(), so between dpm_suspend_start(PMSG_QUIESCE) and resume_target_kernel(), system_freezable_power_efficient_wq can still try to submit SCSI commands and this can cause a panic since the low level SCSI driver (e.g. hv_storvsc) has quiesced the SCSI adapter and can not accept any SCSI commands: https://lkml.org/lkml/2020/4/10/47 At first I posted a fix (https://lkml.org/lkml/2020/4/21/1318) trying to resolve the issue from hv_storvsc, but with the help of Bart Van Assche, I realized it's better to fix software_resume(), since this looks like a generic issue, not only pertaining to SCSI. Cc: All applicable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 6dbeedb7354cc..daf3ea9d81de8 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -898,6 +898,13 @@ static int software_resume(void) error = freeze_processes(); if (error) goto Close_Finish; + + error = freeze_kernel_threads(); + if (error) { + thaw_processes(); + goto Close_Finish; + } + error = load_image_and_restore(); thaw_processes(); Finish: