NetBSD Problem Report #60147

From www@netbsd.org  Mon Mar 30 22:36:58 2026
Return-Path: <www@netbsd.org>
Received: from mail.netbsd.org (mail.netbsd.org [199.233.217.200])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256
	 client-signature RSA-PSS (2048 bits) client-digest SHA256)
	(Client CN "mail.netbsd.org", Issuer "R12" (not verified))
	by mollari.NetBSD.org (Postfix) with ESMTPS id 7FF521A9239
	for <gnats-bugs@gnats.NetBSD.org>; Mon, 30 Mar 2026 22:36:58 +0000 (UTC)
Message-Id: <20260330223657.93F2E1A923F@mollari.NetBSD.org>
Date: Mon, 30 Mar 2026 22:36:57 +0000 (UTC)
From: imuwoto@gmail.com
Reply-To: imuwoto@gmail.com
To: gnats-bugs@NetBSD.org
Subject: /dev/drum i/o seems racy
X-Send-Pr-Version: www-1.0
X-From4GNATS: "imuwoto@gmail.com via gnats" <gnats-admin@NetBSD.org>

>Number:         60147
>Category:       kern
>Synopsis:       /dev/drum i/o seems racy
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Mar 30 22:40:00 +0000 2026
>Last-Modified:  Tue Mar 31 14:30:01 +0000 2026
>Originator:     YAMAMOTO Takashi
>Release:        -current
>Organization:
>Environment:
>Description:
since the initial uvm import, uvm_swap.c has had a comment:

        /*
         * convert block number to swapdev.   note that swapdev can't
         * be yanked out from under us because we are holding resources
         * in it (i.e. the blocks we are doing I/O on).
         */

the assumption doesn't seem true for /dev/drum i/o.

>How-To-Repeat:
code inspection
>Fix:

>Audit-Trail:
From: "YAMAMOTO Takashi" <yamt@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/60147 CVS commit: src/sys/uvm
Date: Tue, 31 Mar 2026 13:43:13 +0000

 Module Name:	src
 Committed By:	yamt
 Date:		Tue Mar 31 13:43:13 UTC 2026

 Modified Files:
 	src/sys/uvm: uvm_swap.c

 Log Message:
 swread/swwrite: hold swap_syscall_lock (cont.)

 fix a harmless merge botch i introduced while porting the patch
 from git to cvs.

 https://gnats.netbsd.org/60147
 PR/60147


 To generate a diff of this commit:
 cvs rdiff -u -r1.228 -r1.229 src/sys/uvm/uvm_swap.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

From: "YAMAMOTO Takashi" <yamt@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/60147 CVS commit: src/sys/uvm
Date: Tue, 31 Mar 2026 14:28:55 +0000

 Module Name:	src
 Committed By:	yamt
 Date:		Tue Mar 31 14:28:55 UTC 2026

 Modified Files:
 	src/sys/uvm: uvm_swap.c

 Log Message:
 swread/swwrite: update a comment about swapdev stability

 https://gnats.netbsd.org/60147
 PR/60147


 To generate a diff of this commit:
 cvs rdiff -u -r1.230 -r1.231 src/sys/uvm/uvm_swap.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

Home	PR Database Search