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jprof is an in-tree profiling tool that runs on Linux. This fixes the error: Sandbox: seccomp sandbox violation: pid 29698, syscall 38, args 0 140731305513136 0 830 22509600 1. Killing process. Sandbox: crash reporter is disabled (or failed); trying stack trace: Sandbox: frame #01: __GI_setitimer (/build/glibc-GKVZIf/glibc-2.23/time/../sysdeps/unix/syscall-template.S:84) Sandbox: frame #02: startSignalCounter(unsigned long) (.../mozilla-central/mozilla/tools/jprof/stub/libmalloc.cpp:464) which occurs during shutdown when running with jprof enabled via the JPROF_FLAGS environment variable containing JP_DEFER without actually sending the signal to start jprof. It presumably occurs sooner if jprof is actually used either via JP_START or by senging a SIGPROF/SIGALRM. With the patch, these steps run to completion. MozReview-Commit-ID: Fx4tzEyqIj2 --HG-- extra : transplant_source : %2AU%15F%8A%C5%E6%1D%03%20%1B%F6W%E9%EB%DA%8F%E7f%5D