Piotr Kubaj
b1b2b22c8d
This is the program that found the races fixed in1f1043d550. One thread keeps a pattern in f14-f31 across a signal, while helpers pinned to the same CPU keep different patterns in the real registers and get woken up from another CPU to preempt it at random points. If the kernel ever hands it somebody else's registers, the pattern doesn't match. The register loads, the thr_kill() and the handshake with the helper are in assembly so that nothing touches the FP registers between sigreturn and the check. It runs for ten seconds and is skipped with fewer than two CPUs. Requested by: adrian Approved by: jhibbits MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D60411 (cherry picked from commit35a226dded) (cherry picked from commit8d36589470)
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