In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
Inthe Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
In the Linux kernel, the following vulnerability has been resolved:tracing/timerlat: Drop interface_lock in stop_kthread()stop_kthread() is the offline callback for trace/osnoise:online , sincecommit 5bfbcd1ee57b ( tracing/timerlat: Add interface_lock around clearingof kthread in stop_kthread() ), the following ABBA deadlock scenario isintroduced:T1 | T2 [BP] | T3 [AP]osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() |As the interface_lock here in just for protecting the kthread field ofthe osn_var, use xchg() instead to fix this issue. Also usefor_each_online_cpu() back in stop_per_cpu_kthreads() as it can takecpu_read_lock() again.
