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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-02-05 09:20:32 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 04:35:28 -0800 |
| commit | c8e9dafe668d9c50e1b1287ac2375497d747f367 (patch) | |
| tree | 98299bbb745531c6b2bc794bc20e7e39f5009f0e /kernel/padata.c | |
| parent | 6a652ed941aa3e31a645c4074ef2a80b2535f5b9 (diff) | |
ftrace: Protect ftrace_graph_hash with ftrace_sync
[ Upstream commit 54a16ff6f2e50775145b210bcd94d62c3c2af117 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'kernel/padata.c')
0 files changed, 0 insertions, 0 deletions