NetBSD Problem Report #36124

From louis@zabrico.com  Wed Apr  4 05:39:47 2007
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Date: Wed, 4 Apr 2007 00:28:16 -0400 (EDT)
From: louis@zabrico.com
Reply-To: louis@zabrico.com
To: gnats-bugs@NetBSD.org
Subject: Panic with 3.1_STABLE and LFS
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>Number:         36124
>Category:       kern
>Synopsis:       panic: lfs_finalize_seguse: negative bytes
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 04 05:40:00 +0000 2007
>Originator:     Charlie Root
>Release:        NetBSD 3.1_STABLE (GENERIC) built on Sun Jan 14 2007 (i386)
>Organization:
	Zabrico
>Environment:


System: NetBSD maat.zabrico.com 3.1_STABLE NetBSD 3.1_STABLE (GENERIC) #2: Sun Jan 14 16:48:08 EST 2007 louis@maat.zabrico.com:/usr/obj/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
Here's the scenario: I have 2 disks:

	wd0 at atabus0 drive 0satalink0: port 1: device present, speed: 1.5Gb/s
	wd0: drive supports 16-sector PIO transfers, LBA48 addressing
	wd0: 111 GB, 232581 cyl, 16 head, 63 sec, 512 bytes/sect x 234441648 sectors
	wd0: 32-bit data port
	wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
	wd0(satalink0:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)

	wd1 at atabus1 drive 0: <ST3120026AS>
	wd1: drive supports 16-sector PIO transfers, LBA48 addressing
	wd1: 111 GB, 232581 cyl, 16 head, 63 sec, 512 bytes/sect x 234441648 sectors
	wd1: 32-bit data port
	wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
	wd1(satalink0:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)

These are mirrored as a RAID-1 array using RaidFrame (raid1):.
	raid1: RAID Level 1
	raid1: Components: /dev/wd0a /dev/wd1a
	raid1: Total Sectors: 234441472 (114473 MB)

raid1 is partitioned into 2 parts. LFS filesystems are installed there.:

	a:  21463040         0     4.4LFS      0     0     0  # (Cyl.      0 -  20959)
	b: 212978432  21463040     4.4LFS      0     0     0  # (Cyl.  20960 - 228946*)

These filesystems are BOTH NFS-Exported.

System appears to panic periodically like this:

	lfs_finalize_seguse: segment 9882 short by 16384
	panic: lfs_finalize_seguse: negative bytes
	cpu_Debugger(cb513d90,e,cb513d7c,ce099f50,c1921e00) at netbsd:cpu_Debugger+0x4
	panic(c07bb040,269a,4000,c1a52280,c1a52684) at netbsd:panic+0x11d
	lfs_finalize_seguse(c1a52000,ce50aa88,0,246,0) at netbsd:lfs_finalize_seguse+0x136
	lfs_writeinode(c1a52000,cc5a4024,cf94c7b0,46,c1d2afd4) at netbsd:lfs_writeinode+0x308
	lfs_writevnodes(c1a52000,c1d2b000,cc5a4024,0,cb513ea4) at netbsd:lfs_writevnodes+0x14f
	lfs_segwrite(c1d2b000,5,c080ad84,cb513f14,206) at netbsd:lfs_segwrite+0x43c
	lfs_sync(c1d2b000,3,cabc0000,cabcd4cc,ffffffff) at netbsd:lfs_sync+0x63
	sync_fsync(cb513f14,0,cb513f3c,c03ce684,c06282e0) at netbsd:sync_fsync+0x8e
	VOP_FSYNC(cc20db34,cabc0000,8,0,0) at netbsd:VOP_FSYNC+0x4c
	sched_sync(cabcb6b4,96b000,974000,0,c0100321) at netbsd:sched_sync+0x1b7       

>How-To-Repeat:
	Unsure as to what triggers this panic.
>Fix:

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