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Since cygwin1.dll version 1.5.20 I get bash processes became <defunct> sometimes after SSH session disconnects. For example, today there was a network problem and my SSH session got broken, after I reconnected, there was 1 <defunct> process. Sometimes this does not happen. All components I am using are updated to latest release available.
shadow@loshadka:~$ ps -a PID PPID PGID WINPID TTY UID STIME COMMAND 1588 1 1588 1588 ? 18 Aug 29 /usr/bin/cygrunsrv 1640 1588 1640 1488 ? 18 Aug 29 /usr/sbin/sshd 1532 1640 1532 1228 ? 18 12:37:45 <defunct> 1576 1640 1576 1676 ? 18 12:22:09 <defunct> I 1136 1 1136 1748 3 1000 14:11:20 /usr/bin/bash 1496 1516 1496 1568 4 1000 16:58:58 /usr/bin/bash 1088 1496 1088 1644 4 1000 17:08:08 /usr/bin/ps shadow@loshadka:~$ kill -9 1136 -bash: kill: (1136) - No such process shadow@loshadka:~$ /bin/kill.exe -f 1136 kill: couldn't open pid 1748 shadow@loshadka:~$ /bin/kill.exe -f 1748 kill: couldn't open pid 1748 shadow@loshadka:~$ kill -9 1532 -bash: kill: (1532) - No such process shadow@loshadka:~$ /bin/kill.exe -f 1532 kill: couldn't open pid 1228 shadow@loshadka:~$ /bin/kill.exe -f 1228 kill: couldn't open pid 1228 shadow@loshadka:~$ ps -W |grep -e bash -e defunct 1532 1640 1532 1228 ? 18 12:37:45 <defunct> 1576 1640 1576 1676 ? 18 12:22:09 <defunct> I 1136 1 1136 1748 3 1000 14:11:20 /usr/bin/bash 1496 1516 1496 1568 4 1000 16:58:58 /usr/bin/bash shadow@loshadka:~$ pslist |grep bash bash 1620 8 4 111 2208 0:00:00.350 5:48:55.546 bash 588 8 4 111 2208 0:00:00.120 5:04:13.920 bash 1568 8 4 123 2236 0:00:00.310 0:23:27.237 bash 1524 8 2 72 1532 0:00:00.040 0:00:00.070 bash 1664 8 2 55 1456 0:00:00.030 0:00:00.040
shadow@loshadka:~$ type pslist pslist is /d/tools/bin/pslist
I also want to mention that before 1.5.20 bash processes just remained in memory and I had to kill them manually. It would be much better if they'd got killed upon SSH disconnection, like it happens in normal unix environment.
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