From: Tim Sander <tim@krieglstein.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>,
linux-watchdog@vger.kernel.org,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Christophe Leroy <christophe.leroy@c-s.fr>,
linux-rt-users@vger.kernel.org
Subject: Re: [BUG] dw_wdt watchdog on linux-rt 4.18.5-rt4 not triggering
Date: Thu, 20 Sep 2018 10:18:33 +0200 [thread overview]
Message-ID: <2133238.jDSj0JK9k1@dabox> (raw)
In-Reply-To: <714e73d5-f7ce-bdcf-b7fd-fc9f02b12693@roeck-us.net>
Hi
I am also seeing this problem.
Am Dienstag, 18. September 2018, 15:46:15 CEST schrieb Guenter Roeck:
> Please not only describe what you are doing, but also provide the complete
> context. Specifically,
> - Did this ever work ?
I have not found a working kernel version.
> If yes, what are working kernel versions ?
I have tried different kernel version which where *not* working:
patch-4.11.12-rt15 (with some Altera/Intel driver patches)
4.16.8-rt3
4.18-rc8-rt1
4.18.7-rt5 (with adxl372 iio patches and denali nand race fix reported on
mainline)
> - Is the watchdog device open ?
Good point: The bootloader arms the watchdog. Then
WATCHDOG_HANDLE_BOOT_ENABLED is enabled in kernel.
But i forgot to let usermode take over.
> - Does it make a difference if it is ?
If i set RuntimeWatchdogSec=30 in /etc/systemd/system.conf (i.e. enable
usermode watchdog) the problem seems to go away (at least i didn't had a
reboot dony with my short testruns by now).
> - What is the configured watchdog timeout (both from BIOS/ROMMON and in
> Linux) ?
30s
So to wrap up: i have the suspicion that the option
WATCHDOG_HANDLE_BOOT_ENABLED without usermode taking over in Linux leads to
some strange behaviour with preempt rt?
Best regards
Tim
next prev parent reply other threads:[~2018-09-20 8:18 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 13:21 [BUG] dw_wdt watchdog on linux-rt 4.18.5-rt4 not triggering Steffen Trumtrar
2018-09-18 13:46 ` Guenter Roeck
2018-09-19 6:46 ` Steffen Trumtrar
2018-09-19 19:43 ` Guenter Roeck
2018-09-20 20:48 ` Julia Cartwright
2018-09-21 13:34 ` Guenter Roeck
2018-09-21 16:42 ` Julia Cartwright
2018-09-21 20:21 ` Guenter Roeck
2018-09-24 7:24 ` Steffen Trumtrar
2018-09-24 7:24 ` Steffen Trumtrar
2018-09-28 21:03 ` [PATCH 0/2] Fix watchdogd wakeup deferral on RT Julia Cartwright
2018-09-28 21:03 ` [PATCH 1/2] kthread: convert worker lock to raw spinlock Julia Cartwright
2018-10-05 16:46 ` Sebastian Andrzej Siewior
2018-10-05 18:10 ` Andrea Parri
2018-10-09 10:56 ` Sebastian Andrzej Siewior
2018-09-28 21:03 ` [PATCH RT 2/2] watchdog, rt: prevent deferral of watchdogd wakeup Julia Cartwright
2018-09-28 22:38 ` kbuild test robot
2018-09-29 6:38 ` Thomas Gleixner
2018-09-29 22:13 ` Sebastian Andrzej Siewior
2018-09-30 1:41 ` [kbuild-all] " Li, Philip
2018-09-28 23:20 ` kbuild test robot
2018-09-30 14:00 ` Guenter Roeck
2018-10-05 16:52 ` Sebastian Andrzej Siewior
2018-09-20 8:18 ` Tim Sander [this message]
2018-09-18 18:14 ` [BUG] dw_wdt watchdog on linux-rt 4.18.5-rt4 not triggering Julia Cartwright
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