8cfcee1fff
In c-archive mode, when we turn off profiling, we restore the previous handler for SIGPROF, and ignore SIGPROF signals if no handler was installed. So if a pending signal lands after we remove the Go signal handler, it will not kill the program. In the current code there is a small window, where we can still receive signals but we are set to not handling the signal. If a signal lands in this window (possibly on another thread), it will see that we are not handling this signal and no previous handler installed, and kill the program. To avoid this race, we set the previous handler to SIG_IGN (ignoring the signal) when turning on profiling. So when turning off profiling we'll ignore the signal even if a stray signal lands in the small window. Fixes #43828. Change-Id: I304bc85a93ca0e63b0c0d8e902b097bfdc8e3f1d Reviewed-on: https://go-review.googlesource.com/c/go/+/374074 Trust: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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