Bug 475131 - Assertion "i->thread_info.rewrite_nbytes == 0' in null sink.
Assertion "i->thread_info.rewrite_nbytes == 0' in null sink.
Status: CLOSED DUPLICATE of bug 472757
Product: Fedora
Classification: Fedora
Component: pulseaudio (Show other bugs)
All Linux
low Severity medium
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Assigned To: Lennart Poettering
Fedora Extras Quality Assurance
: 470277 (view as bug list)
Depends On:
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Reported: 2008-12-07 22:25 EST by Russell Miller
Modified: 2009-02-17 07:21 EST (History)
5 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2008-12-21 12:06:26 EST
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Description Russell Miller 2008-12-07 22:25:01 EST
Description of problem:

OK, I'm trying something, ANYTHING, to getting jack working with timidity.  I've already submitted a bug for that.  So i tried to use fluidsynth.  Installed fluidsynth.  Start it up.  It starts jack.  Yay.  But it won't connect to pulseaudio.  Now, when I really hated pulseaudio (still not a fan of it) and didn't need it, it started with my X server.  But now, no such luck.

So I kill jackd and lashd (guess what, it won't start while jack is running).  Start pulseaudio.  Then start fluidsynth.  It starts jack, tries to connect to pulseaudio, and pulseaudio gives me a nice, fat assertion error.

Now you can't tell me THIS isn't a bug, because 100% of the time, if something triggers an assertion error, it's a *bug*.

The assertion error is:

>E: sink_input.c: Assertion "i->thread_info.rewrite_nbytes == 0' failed at pulsecore/sink-input.c:1150, function pa_sink_input_request_rewind().  Aborting.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Start pulseaudio
2. Start fluidsynth
3. Watch the fur fly.

Actual results:

Nothing happens except for a nice assertion error.

Expected results:

Sound comes out of the speakers.

Additional info:
Comment 1 Lennart Poettering 2008-12-08 13:21:22 EST
If PA finds not other sound card it uses the NULL driver, which is not very well tested and hist that assert.
Comment 2 Lennart Poettering 2008-12-08 13:45:15 EST
*** Bug 470277 has been marked as a duplicate of this bug. ***
Comment 3 Lennart Poettering 2008-12-21 12:06:26 EST

*** This bug has been marked as a duplicate of bug 472757 ***
Comment 4 Phil Mayers 2009-02-17 07:21:40 EST
I saw this same assertion yesterday when I broke away from X to a VT and back again, as per bug 468969

Presumably there's a race where pulseaudio goes too quickly when coming back into X and finds the NULL driver.

It's a very infrequent problem, this is just an FYI.

I agree with the poster in 468969 though - it would be nice if pulseaudio were either crash-proof or restarted itself - could it be made so that:

pulseaudio - forks and watches child, restarts if it dies
 \- pulseaudio - actual sound-processing child

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