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SubjectRe: 2.6.22-rc2-mm1
On Wed, 23 May 2007 10:47:04 -0400 (EDT) Alan Stern <stern@rowland.harvard.edu> wrote:

> On Wed, 23 May 2007, Rafael J. Wysocki wrote:
>
> > On Wednesday, 23 May 2007 09:48, Andrew Morton wrote:
> > > On Wed, 23 May 2007 00:42:33 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
> > >
> > > > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.22-rc2/2.6.22-rc2-mm1/
> > >
> > > This is intermittently getting resume-from-RAM failures. It is not
> > > sufficiently repeatable to be able to bisect.
> > >
> > > [ 1381.119362] PM: Preparing system for mem sleep
> > > [ 2331.798452] Stopping tasks ...
> > > [ 2351.760431] Stopping kernel threads timed out after 20 seconds (2 tasks refusing to freeze):
> > > [ 2351.762385] ksuspend_usbd
> > > [ 2351.764374] khubd
> > > [ 2351.766338] Restarting tasks ... done.
> >
> > Hmm, that seems to be related to usb-fix-suspend-to-ram.patch (probably one of
> > the threads is waiting for a completion by some other thread that has been
> > frozen already).
>
> Is it possible to get an Alt-SysRq-T stack trace during those 20
> seconds? Knowing what those threads are waiting for would be a big
> help.
>

We can do this?

--- a/kernel/power/process.c~freezer-run-show_state-when-freezing-times-out
+++ a/kernel/power/process.c
@@ -157,6 +157,7 @@ static unsigned int try_to_freeze_tasks(
freeze_user_space ? "user space processes" :
"kernel threads",
TIMEOUT / HZ, todo);
+ show_state();
read_lock(&tasklist_lock);
do_each_thread(g, p) {
if (freeze_user_space && !is_user_space(p))
_
but it generates an awful lot of output.

The trace is at http://userweb.kernel.org/~akpm/tasks.txt. Interesting
bits are

[ 144.201264] khubd D 00400005 0 160 2 (L-TLB)
[ 144.204358] c207fe78 00000046 90399a85 00400005 00000246 c207fe60 c25b0cc4 c206f4cc
[ 144.204539] 00000286 00000000 769e4cea 0040000a 90399a85 00400005 c32713c0 c207fed4
[ 144.207754] 00000001 c207fe94 c207febc c02e8e1b 00000000 00000000 00000000 00000000
[ 144.210934] Call Trace:
[ 144.217012] [<c02e8e1b>] wait_for_completion+0x68/0x91
[ 144.220090] [<c011824f>] default_wake_function+0x0/0x9
[ 144.223158] [<c0127a41>] flush_cpu_workqueue+0x4d/0x55
[ 144.226223] [<c0127a69>] wq_barrier_func+0x0/0x8
[ 144.229269] [<c026343d>] usb_release_dev+0x28/0x63
[ 144.232340] [<c0233011>] device_release+0x37/0x7c
[ 144.235431] [<c01cb6c7>] kobject_cleanup+0x3d/0x54
[ 144.238520] [<c01cb6de>] kobject_release+0x0/0x8
[ 144.241631] [<c01cc2a7>] kref_put+0x75/0x82
[ 144.244699] [<c0265482>] hub_thread+0x376/0xa74
[ 144.247768] [<c01180c2>] pick_next_task_fair+0xf2/0x12a
[ 144.250815] [<c0116af1>] __wake_up_common+0x31/0x4f
[ 144.253864] [<c012a259>] autoremove_wake_function+0x0/0x35
[ 144.256902] [<c026510c>] hub_thread+0x0/0xa74
[ 144.259944] [<c012a102>] kthread+0x36/0x5c
[ 144.262891] [<c012a0cc>] kthread+0x0/0x5c
[ 144.265757] [<c010464b>] kernel_thread_helper+0x7/0x10
[ 144.268716] =======================

[ 144.137704] ksuspend_usbd D 00400005 0 157 2 (L-TLB)
[ 144.140830] c2085f18 00000046 9072767a 00400005 c20626f0 c010449b c3182118 c206288c
[ 144.141011] c3182120 c3182120 76d728df 0040000a 9072767a 00400005 c3271200 c3182118
[ 144.144263] c3182120 00000246 c20626f0 c02ea1c9 00000000 00000000 00000000 00000000
[ 144.147576] Call Trace:
[ 144.153929] [<c010449b>] common_interrupt+0x23/0x28
[ 144.157245] [<c02ea1c9>] __down+0xba/0xc6
[ 144.160528] [<c011824f>] default_wake_function+0x0/0x9
[ 144.163832] [<c02664fc>] hcd_resume_work+0x0/0x43
[ 144.167126] [<c02e9fd3>] __down_failed+0x7/0xc
[ 144.170372] [<c0266518>] hcd_resume_work+0x1c/0x43
[ 144.173603] [<c01278cf>] run_workqueue+0x6d/0xdf
[ 144.176780] [<c0127b4c>] worker_thread+0x0/0xd0
[ 144.179885] [<c0127b4c>] worker_thread+0x0/0xd0
[ 144.182930] [<c0127c12>] worker_thread+0xc6/0xd0
[ 144.185964] [<c012a259>] autoremove_wake_function+0x0/0x35
[ 144.189056] [<c012a102>] kthread+0x36/0x5c
[ 144.192118] [<c012a0cc>] kthread+0x0/0x5c
[ 144.195153] [<c010464b>] kernel_thread_helper+0x7/0x10
-
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