Date: Thu, 13 Nov 1997 11:58:55 -0800 (PST) From: Archie Cobbs <archie@whistle.com> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/5034: blocked write on named pipe sticks in uninterruptible sleep Message-ID: <199711131958.LAA26829@bubba.whistle.com> Resent-Message-ID: <199711132000.MAA14326@hub.freebsd.org>
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>Number: 5034
>Category: kern
>Synopsis: blocked write on named pipe sticks in uninterruptible sleep
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Nov 13 12:00:01 PST 1997
>Last-Modified:
>Originator: Archie Cobbs
>Organization:
Whistle Communications, Inc.
>Release: FreeBSD 2.2-STABLE i386
>Environment:
UFS file system.
>Description:
When a process blocks on a write to a named pipe, it is not
interruptible, even by kill -9.
>How-To-Repeat:
1. Create a named pipe
2. Start typing into it using cat
3. Hit control-C as many times as you want
You'll see that the process will not die even with kill -9,
as it is stuck in uninterrupible disk sleep ("fifo").
But as soon as you read from the other end of the pipe,
the process exits.
>Fix:
Not sure, but somewhere some code is probably calling tsleep()
without the PCATCH argument (as it should).
>Audit-Trail:
>Unformatted:
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