When the process being strace'd is PID 1 in a PID namespace and calls
abort(), strace shows an infinite SIGSEGV loop.  Here's a test case:
	#include <stdlib.h>
	int main() { abort(); }

With glibc, running "unshare -prf ./a.out" results in the process dying
from a segmentation fault.

By contrast, "strace -f unshare -prf ./a.out" produces an infinite loop
of segfaults.  Perhaps this could be considered a bug in glibc or Linux,
but it seems less than ideal that strace loops forever in a case where
the non-strace'd process would have died.

If strace is capable of detecting that the traced process has no handler
for the signal, it would be nice to detect and avoid the loop.

- Michael