Hi Tetsuo,
On Wed, Apr 19, 2017 at 7:41 AM, Tetsuo Handa
<penguin-kernel@xxxxxxxxxxxxxxxxxxx> wrote:
> Geert Uytterhoeven wrote:
>> 8 locks held by s2ram/1899:
>> #0: (sb_writers#7){.+.+.+}, at: [<ffffff80081ca1a4>] vfs_write+0xa8/0x15c
>> #1: (&of->mutex){+.+.+.}, at: [<ffffff8008245964>] kernfs_fop_write+0xf0/0x194
>> #2: (s_active#48){.+.+.+}, at: [<ffffff800824596c>] kernfs_fop_write+0xf8/0x194
>> #3: (pm_mutex){+.+.+.}, at: [<ffffff80081059a4>] pm_suspend+0x16c/0xabc
>> #4: (&dev->mutex){......}, at: [<ffffff80083d4920>] device_resume+0x58/0x190
>> #5: (cma_mutex){+.+...}, at: [<ffffff80081c516c>] cma_alloc+0x150/0x374
>> #6: (lock){+.+...}, at: [<ffffff800818b8ec>] lru_add_drain_all+0x4c/0x1b4
>> #7: (cpu_hotplug.dep_map){++++++}, at: [<ffffff80080ab8f4>] get_online_cpus+0x3c/0x9c
>
> I think this situation suggests that
[...]
> Somebody is waiting forever with cpu_hotplug.lock held?
> I think that full dmesg with SysRq-t output is appreciated.
As SysRq doesn't work with my serial console, I added calls to show_state()
and show_workqueue_state() to check_hung_task().
Result with current linus/master attached.
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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