Re: kern/38165 (pipe(2) failure, then uvm_fault(0x*, 0, 1) -> 0xe (kernel: supervisor trap page fault, code=0))

["Greg A. Woods" <woods%planix.com@localhost>]

The following reply was made to PR kern/38165; it has been noted by GNATS.

From: "Greg A. Woods" <woods%planix.com@localhost>
To: NetBSD GNATS <gnats-bugs%NetBSD.org@localhost>
Cc: kern-bug-people%netbsd.org@localhost,
        NetBSD GNATS Administrator <gnats-admin%NetBSD.org@localhost>,
        rmind%NetBSD.org@localhost
Subject: Re: kern/38165 (pipe(2) failure, then uvm_fault(0x*, 0, 1) -> 0xe 
(kernel: supervisor trap page fault, code=0))
Date: Fri, 27 Nov 2009 12:21:09 -0500

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 At Fri, 27 Nov 2009 04:39:03 +0000 (UTC), rmind%NetBSD.org@localhost wrote:
 Subject: Re: kern/38165 (pipe(2) failure, then uvm_fault(0x*, 0, 1) -> 0xe =
 (kernel: supervisor trap page fault, code=3D0))
 >=20
 > Synopsis: pipe(2) failure, then uvm_fault(0x*, 0, 1) -> 0xe (kernel: supe=
 rvisor trap page fault, code=3D0)
 >=20
 > State-Changed-From-To: open->feedback
 > State-Changed-By: rmind%NetBSD.org@localhost
 > State-Changed-When: Fri, 27 Nov 2009 04:39:02 +0000
 > State-Changed-Why:
 > Cannot reproduce in -current.  It was likely fixed in netbsd-5/-current.
 > Do you see any similar problem on recent systems?
 
 Unfortunately I do not have any systems running or in development beyond
 netbsd-4 yet.  (Go Git Go! ;-))
 
 I would suggest trying to reproduce the problem in netbsd-5, and if
 it works there for insanely long pipelines then we can close this PR.
 
 I do see a _lot_ of changes in sys/kern/sys_pipe.c since netbsd-4!  :-)
 But from what I see, I don't think it would be very easy to factor out a
 change which might fix this problem for netbsd-4, if indeed this is
 where the bug is in the first place.
 
 --=20
                                                Greg A. Woods
 
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<woods%robohack.ca@localhost>
 Planix, Inc. <woods%planix.com@localhost>      Secrets of the Weird 
<woods%weird.com@localhost>
 
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