[pull] master from ruby:master - #1410
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Recently we were debugging a Ruby crash by looking at a core dump and realized that there was no crash, it was another process sending a SIGABRT signal to the process. There was no differentiation in the crash report for this case. Now, when another process sends a SIGABRT, SIGSEGV, etc to a process it shows the PID of the sender. This way we can know right away that it was not a real crash. The crash message now looks like this: ``` [BUG] Aborted at 0x00000001831c150c (sent by pid 53859) ``` If "(sent by pid XXX)" or "(sent by another process)" is included in the crash message, the signal was sent by another process.
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