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+ disable SIGCANCEL/SIGSETXID signal handlers
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This avoids exec per test.
Also allows to pre-map shared memory regions.
And will allow to pre-map coverage regions, etc.
Seems to work already, but probably there are still some bugs.
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Spinning is bad. Also pollutes strace output.
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In this mode we execute pairs of syscalls concurrently
to provoke data races in kernel.
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First, it is just not necessary to open it multiple times.
But more importantly a program can close fds that it previosuly used:
r0 = open(...)
close(r0)
close(r0)
and this can close cover fds created in threaded mode.
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This allows to use larger coverage buffer
and not overflow output at the same time.
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