Red Hat Bugzilla – Bug 213783
alsa's arecord stops recording after 3hrs 23min.
Last modified: 2008-08-02 19:40:34 EDT
Description of problem:
alsa's arecord stops recording after 3hrs 23min when recording in CD
format. (44100 samples/sec, 2 channel, 16bits / sample)
Most notable this is approximately the time required to reach 2^31
bytes. I suspect some variable that should have been a ssize_t is
erroniously an int and it is rolling over.
The exact roll-over for cd-audio would be at 3 hrs 22 min 53.94 sec,
which is pretty close to my observed blow-up.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. add a shell script called pcmaudiod to xinetd's tcp daemon's
2. put this one line in the shell script: arecord -q -f cd -
3. connect up a tcp listener and wait 3 hrs 23 min.
recording stops while listener was expecting it to continue.
recording should continue till listener closes his end of the tcp connection.
I'll try to reproduce. Given how long this takes, it is going to be fun.
I don't know if this happens on a local file copy or if it is a result
of something in the tcp stream.
I ran an extended test with arecord's output going to a local file. At roughly
the same point in time arecord closed the output file, renmaed it
filename-01.wav and opened a second file filename-02.wav. The byte-count for
this transition to a second file was 2147483692 bytes (very roughly 2^31 bytes
minus a bit of padding).
-rw-r--r-- 1 root wsrcc 2147483692 Nov 2 18:46 arecord-01.wav
-rw-r--r-- 1 root wsrcc 2147483692 Nov 2 22:11 arecord-02.wav
-rw-r--r-- 1 root wsrcc 278592044 Nov 2 22:38 arecord-03.wav
It now appears that the closing of the tcp stream is a botch caused
by the program attempting to roll files in order to keep them under 2^31 bytes.
Personally, the mandatory rolling of the files already strikes me as a
misfeature. If I wanted a contigious 4 gig file the program should let me have
it. Closing a stdout stream after 2^31 bytes is just a bug on top of things.
Could you please test this package? It contains a large file support. (rebuild
it as root with "rpmbuild --rebuild package.rpm" and install from
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