Re: hangup in close(2) after posix_openpt(3)

[David Holland <dholland-tech%netbsd.org@localhost>]

On Sun, Oct 18, 2015 at 03:27:07AM +0900, Izumi Tsutsui wrote:
 > joerg@ wrote:
 > 
 > > On Sat, Oct 17, 2015 at 03:23:44PM +0900, Izumi Tsutsui wrote:
 > > > I notice we can avoid the hangup in lwp_park() after exit(3)
 > > > by calling _exit(2) instead exit(3) in the parent canuum,
 > > > so I'll put it as a kludge for now.
 > > 
 > > Be careful, that bypasses all atexit handler. The reason why it might
 > > work is that this includes the fflush of stdin and stdout.
 > 
 > Do you have any idea about "hangup in lwp_park() after exit(3)"?
 > Is it a bug, or expected behavior?
 > 
 > Currently the hangup in lwp_park() (which can be killed only by kill -9)
 > is much annoying than _exit(2) kludge.

lwp_park is what happens when a threaded process is blocked, so my
first guess would be an application-level deadlock.

-- 
David A. Holland
dholland%netbsd.org@localhost