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SubjectRe: Why processes on linux loses signals?
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> In short, processes on linux loses signals.  It happens
> rarely, but it happens, and the frequency of this happening
> is enough to be annoying.
>
> ...
>
> The problem becomes much much worse when a system has multiple
> cores... But with even second core the issue emerges almost
> immediately ...

Looks like a classical race description.
Double-check your user-space code for signal-related races.


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