* Ingo Molnar <mingo@xxxxxxxxxx> wrote: > After I got the GDB backtraces I tried to clean up leftover tasks, but the main > thread would not go away: > > 4006 pts/0 00:00:00 protection_keys <defunct> > > neither SIGCONT nor SIGKILL appears to help: Just seconds after I sent this I found out that this was user error: I forgot about a gdb session I still had running, which understandably blocked the task from being cleaned up. Once I exited GDB it all got cleaned up properly. The hang problem is still there, if I run a script like this: while :; do date; echo -n "32-bit: "; ./protection_keys_32 >/dev/null; date; echo -n "64-bit: "; ./protection_keys_64 >/dev/null; done then within a minute one of the testcases hangs reliably. Out of 4 attempts so far one hang was in the 32-bit testcase, 3 hangs were in the 64-bit testcase - so 64-bit appears to trigger it more frequently. Thanks, Ingo
