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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-02-05 09:20:32 -0500 |
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| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-02-05 17:16:42 -0500 |
| commit | 54a16ff6f2e50775145b210bcd94d62c3c2af117 (patch) | |
| tree | 9fcea20433e1f5c27406e9a793e6bd4d090dd03c /init | |
| parent | 16052dd5bdfa16dbe18d8c1d4cde2ddab9d23177 (diff) | |
| download | lwn-54a16ff6f2e50775145b210bcd94d62c3c2af117.tar.gz lwn-54a16ff6f2e50775145b210bcd94d62c3c2af117.zip | |
ftrace: Protect ftrace_graph_hash with ftrace_sync
As function_graph tracer can run when RCU is not "watching", it can not be
protected by synchronize_rcu() it requires running a task on each CPU before
it can be freed. Calling schedule_on_each_cpu(ftrace_sync) needs to be used.
Link: https://lore.kernel.org/r/20200205131110.GT2935@paulmck-ThinkPad-P72
Cc: stable@vger.kernel.org
Fixes: b9b0c831bed26 ("ftrace: Convert graph filter to use hash tables")
Reported-by: "Paul E. McKenney" <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions