linux-kernel - Re: [BUG] 3.10 regression: hang on suspend

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20130717122944.GA25894@redhat.com>
Date:	Wed, 17 Jul 2013 14:29:45 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Ortwin Glück <odi@....ch>
Cc:	Arend van Spriel <arend@...adcom.com>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [BUG] 3.10 regression: hang on suspend

On Tue, Jul 16, 2013 at 08:23:33PM +0200, Ortwin Glück wrote:
> Without NetworkManager, no X, on console and with plain jane wpa_supplicant I do
> echo mem > /sys/power state
> 
> After that, it still responds to keyboard events: I can switch VT
> and type on the consoles, but I can not login on a different VT
> (pressing Enter after the username doesn't return). So I guess tasks
> have been frozen, but it hangs in stopping devices.
> 
> settings for pm_test:
> devices: same behviour as above
> freezer: works as expected (stops tasks; sleeps; resumes tasks)
> 
> Nothing in the logs. How can I enable more log?

This looks like livelock, i.e. kernel wait for mutex to be released
but that never happen , for example because of deadlock. Enabling 
CONFIG_LOCKDEP=y could help to diagnose this. Other than that
sysreq key w (show blocked task) could help, see
Documentation/sysrq.txt for instructions how to use this key.
Also please remember set no_console_suspend boot option to
allow print messages on tty during suspend.

Stanislaw

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/