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PR/56422 CVS commit: src/sys/kern

The following reply was made to PR bin/56422; it has been noted by GNATS.

From: "Juergen Hannken-Illjes" <>
Subject: PR/56422 CVS commit: src/sys/kern
Date: Sat, 2 Oct 2021 07:35:41 +0000

 Module Name:	src
 Committed By:	hannken
 Date:		Sat Oct  2 07:35:41 UTC 2021
 Modified Files:
 	src/sys/kern: sys_pipe.c
 Log Message:
 Fix a deadlock where one thread writes to a pipe, has more data
 and no space in the pipe and waits on "pipe_wcv" while the reader
 is closing the pipe and waits on "pipe_draincv".
 Swap the test for "PIPE_EOF" and the "cv_wait_sig()" in "pipe_write()".
 PR bin/56422 "zgrep -l sometimes hangs"
 To generate a diff of this commit:
 cvs rdiff -u -r1.156 -r1.157 src/sys/kern/sys_pipe.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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