NetBSD Problem Report #38801
From martin@duskware.de Fri May 30 16:42:20 2008
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Date: Fri, 30 May 2008 16:40:44 +0000 (UTC)
From: ad@netbsd.org
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To: netbsd-bugs-owner@NetBSD.org
Subject: most drivers assume seralized d_open/d_close
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>Number: 38801
>Category: kern
>Synopsis: most drivers assume seralized d_open/d_close
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri May 30 16:45:00 +0000 2008
>Originator: Andrew Doran
>Release: 4.99.63
>Organization:
The NetBSD Project
>Environment:
n/a
>Description:
Most drivers assume the following but it's not true:
- calls to open() will not overlap
- open() and close() will not overlap
Solaris prevents it, and older versions of NetBSD prevented it. At some
point a hack was added for tty devices that released the vnode lock while
a device was being opened/closed, as ttys are known to sleep long-term in
their open/close routines.
>How-To-Repeat:
Code inspection.
>Fix:
Serialize all open/close activity. To be complete it would need to be
done by major number as we have no way of decoding the minor.
Ensure that any long-term waits in d_open/d_close are interruptible.
(Contact us)
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