From: Jiri Slaby <jirislaby@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: clocksource: !keventd_up() && schedule_work() == oops
Date: Wed, 09 Sep 2009 10:00:54 +0200 [thread overview]
Message-ID: <4AA760B6.6070601@gmail.com> (raw)
Hi,
I started to see oopses on boot in qemu machine because keventd is
created in kernel_init/do_basic_setup, but schedule_work is done earlier
in kernel_init/smp_init[1] when the tsc is unstable during this early phase.
It looks like "clocksource: Resolve cpu hotplug dead lock with TSC
unstable" is the culprit.
Creating its own either singlethread or "multithread" workqueue won't
work either (we do not have singlethread_cpu and cpu_populated_map).
Checking !keventd_up() in the clocksource code looks to me like a hack.
Any ideas, please?
[1]
kernel_init/smp_init/cpu_up/native_cpu_up/check_tsc_sync_source/mark_tsc_unstable/clocksource_mark_unstable/__clocksource_unstable
next reply other threads:[~2009-09-09 8:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-09 8:00 Jiri Slaby [this message]
2009-09-14 9:28 ` clocksource: !keventd_up() && schedule_work() == oops Jiri Slaby
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