Re: [alsa-devel] [BUG] ALSA: core: seq: a possible double-lock bug in snd_seq_midisynth_remove()

On Mon, 29 Jul 2019 05:54:07 +0200, Jia-Ju Bai wrote:

In snd_seq_midisynth_remove(), there is a possible double-lock bug: snd_seq_midisynth_remove()     mutex_lock(&register_mutex); -- line 421     snd_seq_delete_kernel_client() --- line 436         seq_free_client() -- line 2244             mutex_lock(&register_mutex); -- line 294

This bug is found by a static analysis tool STCheck written by us.

No, it's a false-positive report. Both register_mutex's are static, hence they are local to each file. That is, you're looking at two different mutexes.

Takashi