tracing: Fix potential deadlock in cpu hotplug with osnoise
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In the Linux kernel, the following vulnerability has been resolved:
tracing: Fix potential deadlock in cpu hotplug with osnoise
The following sequence may leads deadlock in cpu hotplug:
task1 task2 task3
----- ----- -----
mutex_lock(&interface_lock)
[CPU GOING OFFLINE]
cpus_write_lock();
osnoise_cpu_die();
kthread_stop(task3);
wait_for_completion();
osnoise_sleep();
mutex_lock(&interface_lock);
cpus_read_lock();
[DEAD LOCK]
Fix by swap the order of cpus_read_lock() and mutex_lock(&interface_lock).
Produtos afetados
Linux · LinuxReferências
https://git.kernel.org/stable/c/03474a01c199de17a8e2d39b51df6beb9c76e831https://git.kernel.org/stable/c/1f9885732248d22f788e4992c739a98c88ab8a55https://git.kernel.org/stable/c/7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9fhttps://git.kernel.org/stable/c/7aa095ce7d224308cb6979956f0de8607df93d4fhttps://git.kernel.org/stable/c/cf929c21eeed5bd39873fb14bfdfff963fa6f1dahttps://git.kernel.org/stable/c/ef41a85a55022e27cdaebf22a6676910b66f65aahttps://git.kernel.org/stable/c/f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7