[pulseaudio-tickets] [Bug 41754] New: conf_pulse_hook_load_if_running allocates shm at a dangerous time

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41754

           Summary: conf_pulse_hook_load_if_running allocates shm at a
                    dangerous time
           Product: PulseAudio
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: alsa
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: paul at linuxaudiosystems.com
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


if JACK is started in its default real-time mode (with memlockall in effect),
it will trigger a call to the libasound function 
snd_config_search_definition(). This will eventually result in a call to
conf_pulse_hook_load_if_running() within libasound_module_conf_pulse.so, which
will in turn eventually call  pa_shm_create_rw(), which allocates 64MB of
shared memory. JACK's RT mode forces this to be pinned into physical RAM, which
on a "small memory" system (e.g. 700MB with Ubuntu 10.10 (32 bit system) will
cause JACK to bus error and the overall system to behave very erratically from
a user perspective due to OOM-like conditions.

it does not seem appropriate for PA to be allocating shm in response to
libasound checking device definitions.

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