The driver may sleep while holding a read lock. The function call path (from bottom to top) in Linux 4.19 is: sound/core/seq/seq_memory.c, 96: copy_from_user in snd_seq_dump_var_event sound/core/seq/seq_virmidi.c, 97: snd_seq_dump_var_event in snd_virmidi_dev_receive_event sound/core/seq/seq_virmidi.c, 88: _raw_read_lock in snd_virmidi_dev_receive_event copy_from_user() can sleep at runtime. I am not sure how to properly fix this possible bug, so I only report it. This bug is found by a static analysis tool STCheck written by myself. Best wishes, Jia-Ju Bai _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
