Bug 8181

Summary:	suspend/resume hangs until keypress
Product:	Power Management	Reporter:	Tomas Janousek (tomi)
Component:	Other	Assignee:	power-management_other
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	gmazyland
Priority:	P2
Hardware:	i386
OS:	Linux
Kernel Version:	2.6.29-rc3-git20070311	Subsystem:
Regression:	---	Bisected commit-id:
Attachments:	dmesg before suspend kernel config lspci/cpuinfo/lsmod

Description Tomas Janousek 2007-03-12 04:28:08 UTC

Most recent kernel where this bug did *NOT* occur: 2.6.20
Distribution: debian testing/unstable
Hardware Environment: HP Compaq nx7300 (generally the same as nx7400)
Software Environment:
Problem Description:
I use hibernate and uswsusp. When I try to suspend to disk, it gets stuck on
'Suspending consoles' and does not continue until I press like 3 keys. It does
the same on resume.

Comment 1 Tomas Janousek 2007-03-12 04:29:19 UTC

Created attachment 10712 [details]
dmesg before suspend

Comment 2 Tomas Janousek 2007-03-12 04:30:31 UTC

Created attachment 10713 [details]
kernel config

Comment 3 Tomas Janousek 2007-03-12 04:34:05 UTC

Created attachment 10714 [details]
lspci/cpuinfo/lsmod

Comment 4 Milan Broz 2007-03-13 10:14:30 UTC

Seems the same as in thread here (I see it on Thinkpad X60s)
http://lkml.org/lkml/2007/3/11/112

2.6.21-rc3 with NO_HZ or CONFIG_TICK_ONESHOT, 

suspend trace:
enable_nonboot_cpus
 _cpu_up
  raw_notifier_callchain (CPU_UP_PREPARE)
    ...
    update_sched_domains
     detach_destroy_domains
       [waits here] --> synchronize_sched (==synchronize_rcu)
(some details in thread above)

Maybe related to
http://lkml.org/lkml/2007/3/13/3

Comment 5 Milan Broz 2007-03-17 02:31:14 UTC

Fixed for me by the patch here http://lkml.org/lkml/2007/3/16/406

Comment 6 Tomas Janousek 2007-03-17 07:55:19 UTC

For me as well.