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Subjectoss bug introduced since 2.4.18?
From
Since upgrading from 2.4.18 to 2.4.20, I've had a problem unmapping 
mmap'd sound buffers. This problem is still present in 21-pre3.
Machine is a P-III Celeron on an Asus CUSL-2 board.

I have a program which captures audio for streaming using mmap
(verified with ptrace). When I'm done, I issue a SNDCTL_DSP_SETTRIGGER
with pointer to int value of 0 and munmap the buffer. There is about a
2/3 chance the munmap call will never return and the process will not
die. At this point, I can still login to the machine through another
window or the console, but any process making system calls which I have
not yet determined follow the same fate as the original problem
process. So far, I've found the 'who' and 'ps' commands do this. The
ps output runs until what seems to be just before reporting the
original hung process.

This is not a problem if I boot with .18, but I need to run >= 20 for
my network card.

I'm using a Sound Blaster Live 5.1, and I've tried switching from the
supplied drivers in the kernel to using Creative's open source drivers
with the same results. So it may be in the core sound and not specific
to the sound card driver?

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