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https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision d16a8c31077e75ecb9427fbfea59b74eed00f698 authored by Steven Rostedt (VMware) on 06 May 2020, 14:20:10 UTC, committed by Steven Rostedt (VMware) on 07 May 2020, 17:32:40 UTC 
tracing: Wait for preempt irq delay thread to finish
 
Running on a slower machine, it is possible that the preempt delay kernel
thread may still be executing if the module was immediately removed after
added, and this can cause the kernel to crash as the kernel thread might be
executing after its code has been removed.

There's no reason that the caller of the code shouldn't just wait for the
delay thread to finish, as the thread can also be created by a trigger in
the sysfs code, which also has the same issues.

Link: http://lore.kernel.org/r/5EA2B0C8.2080706@cn.fujitsu.com

Cc: stable@vger.kernel.org
Fixes: 793937236d1ee ("lib: Add module for testing preemptoff/irqsoff latency tracers")
Reported-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Joel Fernandes <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 parent 5b4dcd2
Raw File
Tip revision: d16a8c31077e75ecb9427fbfea59b74eed00f698 authored by Steven Rostedt (VMware) on 06 May 2020, 14:20:10 UTC
tracing: Wait for preempt irq delay thread to finish
Tip revision: d16a8c3
README 
Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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