Update:
I have another case of hang:
?(1)-+-bash(1419290)
|-bash(1419318)---make(1423770)---sh(1423783)---sh(1423838)
|-mintty(1249269)---bash(1249277)
|-mintty(47)---bash(55)---bash(1132827)---make(1139169)---sh(1139182)---make(1139234)---sh(1206695)---sh(1206721)---make(1206764)---sh(1206770)---make(1206783)---perl(1249042)
|-mintty(596773)---bash(596790)---pstree(1423865)
`-mintty(1417449)---bash(1417457)
$ ps aux | grep 1249042
1249042 1206783 1132827 1249050 pty0 197608 Oct 31 /usr/bin/perl
1249077 1249042 1132827 1249092 pty0 197608 Oct 31
/usr/bin/nm <defunct>
Here the process perl(1249042) is waiting for a pipe, while its child
process nm(1249077) is in the status "defunct". nm(1249077) appears in
output of `ps aux`, but doesn't appear in output of `pstree -p -l`.
Is there any case, where a child process can exit unexpected, but the
parent process still incorrectly wait for the child process forever?
Thanks!
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