To reproduce (on an 8 CPU VM):
sudo apt-get update && sudo apt-get dist-upgrade
sudo apt-get build-dep stress-ng
git clone git://kernel.ubuntu.com/cking/stress-ng
cd stress-ng
make
sudo ./stress-ng --vm-segv 0 -t 10 -v
Comment out a ptrace line and rebuild and re-run and the hang does not
occur. So it's ptrace releated.
diff --git a/stress-vm-segv.c b/stress-vm-segv.c
index 39e4cbeb..54d590cd 100644
--- a/stress-vm-segv.c
+++ b/stress-vm-segv.c
@@ -129,7 +129,7 @@ kill_child:
stress_process_dumpable(false);
#if defined(HAVE_PTRACE)
- (void)ptrace(PTRACE_TRACEME);
+ //(void)ptrace(PTRACE_TRACEME);
kill(getpid(), SIGSTOP);
#endif
(void)sigemptyset(&set);
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https://bugs.launchpad.net/bugs/1864063
Title:
vm-segv from ubuntu_stress_smoke_test failed on B
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