From: "Steven Rostedt (Red Hat)" <[email protected]> The iteration of the ftrace function list and the call to ftrace_match_record() need to be protected by the ftrace_lock.
Signed-off-by: Steven Rostedt <[email protected]> --- kernel/trace/ftrace.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index cacf085..f104c45 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -3017,14 +3017,16 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, hash = alloc_and_copy_ftrace_hash(FTRACE_HASH_DEFAULT_BITS, *orig_hash); if (!hash) { count = -ENOMEM; - goto out_unlock; + goto out; } if (unlikely(ftrace_disabled)) { count = -ENODEV; - goto out_unlock; + goto out; } + mutex_lock(&ftrace_lock); + do_for_each_ftrace_rec(pg, rec) { if (!ftrace_match_record(rec, NULL, search, len, type)) @@ -3070,15 +3072,15 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, } while_for_each_ftrace_rec(); - mutex_lock(&ftrace_lock); ret = ftrace_hash_move(&trace_probe_ops, 1, orig_hash, hash); if (ret < 0) count = ret; __enable_ftrace_function_probe(); - mutex_unlock(&ftrace_lock); out_unlock: + mutex_unlock(&ftrace_lock); + out: mutex_unlock(&trace_probe_ops.regex_lock); free_ftrace_hash(hash); -- 1.7.10.4
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