509372 - Browser hang with main thread being traced (sound related?)

Status: RESOLVED DUPLICATE of bug 504670

(Firefox :: General, defect)

Description

[Matthew Cline]

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2a1pre) Gecko/20090802 Minefield/3.6a1pre ID:20090802032048

Sometimes the browser will hang with the main thread (4622 in this instance) appearing to be traced.  The result of "pstree" is:

    |-fox(4610)---firefox(4613)---run-mozilla.sh(4618)---firefox-bin(4622)-+-firefox-bin(6747)

The result of "top" is (with the "T" meaning "traced or stopped"):

   4622 matt      17  -5  819m 292m  21m T  0.0 58.1 143:32.79 firefox-bin
   6747 matt      15  -5  819m 292m  21m S  0.0 58.1   0:01.43 firefox-bin

And the result of "ps -eafl" being (with "ptrace" and "snd_pc" being the kernel functions in which the threads are sleeping):

    0 T matt      4622  4618 40  77  -5 - 209689 ptrace Aug09 pts/2   02:23:32 /usr/home/matt/graze/browsers/firefox/firefox-bin -P default
    1 S matt      6747  4622  1  75  -5 - 209689 snd_pc 03:09 pts/2   00:00:01 /usr/home/matt/graze/browsers/firefox/firefox-bin -P default

Since "snd_pc" seems to have something to do with the sound system, this might be a duplicate of one of the "sound/audio freezes browser" bugs.  I tried starting up a non-browser mp3 player and then starting up some sound-using Flash apps, but that didn't duplicate the problem.

I seem to be using ALSA with the snd_ens1371 driver.

Also, I note that doing "kill -KILL 4622" didn't do anything, I assume because the lightweight-process 4622 was traced/stopped.

Comment 1

[Wayne Mery (:wsmwk)]

dup of bug 504670?

Comment 2

[Wayne Mery (:wsmwk)]

please reopen if not fixed when 504670 gets fixed