[alsa-devel] [PATCH v2 linux-next] ALSA: pcm: 'BUG:' message unnecessarily triggers kerneloops

Tim Gardner tim.gardner at canonical.com
Wed Apr 16 16:18:35 CEST 2014

BugLink: http://bugs.launchpad.net/bugs/1305480

The kerneloops-daemon scans dmesg for common crash signatures, among
which is 'BUG:'. The message emitted by the PCM library is really a
warning, so the most expedient thing to do seems to be to change the

Cc: Jaroslav Kysela <perex at perex.cz>
Cc: Takashi Iwai <tiwai at suse.de>
Cc: Mark Brown <broonie at linaro.org>
Cc: Lars-Peter Clausen <lars at metafoo.de>
Cc: JongHo Kim <furmuwon at gmail.com>
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>

v2: Changed string preface from "OVER RUN" to "XRUN". As Takashi pointed out,
'Use a term "XRUN", as it's not always an overrun.'

 sound/core/pcm_lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index ce83def..9acc77e 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -345,7 +345,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 			snd_pcm_debug_name(substream, name, sizeof(name));
-				"BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
+				"XRUN: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
 				name, pos, runtime->buffer_size,

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