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SubjectRe: deadlock in crashed multithreaded job
> The symptoms: running the tests (make check) sometimes ends up
> with hanging processes.

Does it _only_ hang during coredumping, or also during normal usage?

Could you remove
down_read(&mmap_sem);
binfmt->coredump();
up_read(&mmap_sem);
from fs/exec.c and rerun your tests?

The hang during coredumping is known, there are 2 fixes [I have one, not
yet released, Andrea wrote one, IIRC included in his -aa kernels].

Up to 2.4.10 there was a second hang with /proc/*/stats, that one is
fixed in 2.4.10.

--
Manfred
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