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This allows for a more clean interface between RPCServer and Runner.
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Signal rotation is intended to make the fuzzer re-discover flaky coverage
in non flaky way. However, taking into accout that we get effectively
the same effect after each manager restart, and that the fuzzer is overloaded
with triage/smash jobs, it does not look to be worth it.
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We see some errors of the form:
SYZFAIL: coverage filter is full
pc=0x80007000c0008 regions=[0xffffffffbfffffff 0x243fffffff 0x143fffffff 0xc3fffffff] alloc=156
Executor shouldn't send non kernel addresses in signal,
but somehow it does. It can happen if the VM memory is corrupted,
or if the test program does something very nasty (e.g. discovers
the output region and writes to it).
It's not possible to reliably filter signal in the tested VM.
Move all of the filtering logic to the host.
Fixes #4942
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It's a more general name that says what happened
rather than a detail of what excutor should do.
We can use this notification for other things as well.
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Split out most of the Runner functionality into a separate file.
This should make it easier to reason about what rpcserver.go does and
it also makes further pkg/rpcserver refactoring simpler.
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Move all syz-fuzzer logic into syz-executor and remove syz-fuzzer.
Also restore syz-runtest functionality in the manager.
Update #4917 (sets most signal handlers to SIG_IGN)
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