Public bug reported:
Binary package hint: pulseaudio
I'm testing with 2 USB sound devices. One works, one doesn't.
Using a Cakewalk (Roland) UA-25EX (2 audio channels in/out + midi
in/out) works fine. The device may be connected, removed and reconnected
at any time wouthout problems.
A Digitech RP1000 guitar processor (2 audio channels in/out + midi
in/out) sends pulseaudio into an endless loop when it is disconnected or
powered off. It appears to be an unhandled ENODEV as repeated in strace:
[pid 21874] ppoll([{fd=3, events=POLLIN}, {fd=56, events=POLLIN}, {fd=55,
events=POLLIN}, {fd=7, events=POLLIN}, {fd=58, events=POLLIN}, {fd=64,
events=POLLIN}, {fd=67, events=POLLIN}, {fd=19, events=POLLIN}, {fd=57,
events=POLLIN}, {fd=18, events=POLLIN}, {fd=25, events=POLLIN}, {fd=51,
events=POLLIN}, {fd=54, events=POLLIN}, {fd=50, events=POLLIN}, {fd=49,
events=POLLIN}, {fd=48, events=POLLIN}, {fd=47, events=POLLIN}, {fd=46,
events=POLLIN}, {fd=45, events=POLLIN}, {fd=37, events=POLLIN}, {fd=40,
events=POLLIN}, {fd=36, events=POLLIN}, {fd=35, events=POLLIN}, {fd=34,
events=POLLIN}, {fd=33, events=POLLIN|POLLERR|POLLHUP}, {fd=33, events=0},
{fd=27, events=POLLIN}, {fd=30, events=POLLIN}, {fd=21, events=POLLIN}, {fd=24,
events=POLLIN}, {fd=14, events=POLLIN}, {fd=17, events=POLLIN}, ...], 37, {5,
749931000}, NULL, 8) = 1 ([{fd=58, revents=POLLERR}], left {5, 749924521})
[pid 21874] clock_gettime(CLOCK_MONOTONIC, {12993, 777619310}) = 0
[pid 21874] read(58, 0xbf8d1194, 72) = -1 ENODEV (No such device)
[pid 21874] clock_gettime(CLOCK_MONOTONIC, {12993, 777676225}) = 0
... then back to poll() and it keeps looping trying to read off the same fd
(58).
Output from pulseaudio (--log-level=debug) from pulseaudio starting when
the RP1000 gets connected is attached. There is only one line of info
written after the cable is pulled (or turned off) before pulseaudio
spins off in the loop.
D: module-udev-detect.c: /dev/snd/controlC2 is accessible: no
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
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pulseaudio goes into poll-read loop when removing usb device
https://bugs.launchpad.net/bugs/680861
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