>Number:         21576
>Category:       kern
>Synopsis:       heavy nfs write traffic panics the system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 14 14:08:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Antti Kantee
>Release:        NetBSD 1.6R
>Organization:
>Environment:
System: NetBSD brain-damage.localhost.fi 1.6R NetBSD 1.6R (BRAIN-DAMAGE.DEBUG) #
2: Sat May 3 18:29:50 EEST 2003 pooka@brain-damage.localhost.fi:/sys/arch/i386/c
ompile/BRAIN-DAMAGE.DEBUG i386
Architecture: i386
Machine: i386

NFS server 1.6.1 i386 with a 100mbit network in between.

>Description:
Writing a large file to nfs repeatedly panics the system after the
system has written a couple hundred megabytes.

panic: kernel %sassertion "%s" failed: file "%s", line %d
#0  0x1 in ?? ()
(gdb) bt
#0  0x1 in ?? ()
#1  0xc0276947 in cpu_reboot (howto=256, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:879
#2  0xc020f533 in panic () at ../../../../kern/subr_prf.c:246
#3  0xc03335a8 in __main () at ../../../../../../lib/libkern/__assert.c:47
#4  0xc0199696 in nfs_doio_write (bp=0xc0dd6960, uiop=0xe3453f0c)
    at ../../../../nfs/nfs_bio.c:986
#5  0xc0199bca in nfs_doio (bp=0xc0dd6960, p=0x0)
    at ../../../../nfs/nfs_bio.c:1163
#6  0xc01a3a42 in nfssvc_iod (l=0xe33e5704)
    at ../../../../nfs/nfs_syscalls.c:992
#7  0xc01a3ad0 in start_nfsio (arg=0xe33e5704)
    at ../../../../nfs/nfs_syscalls.c:1022
(gdb) frame 4
#4  0xc0199696 in nfs_doio_write (bp=0xc0dd6960, uiop=0xe3453f0c)
    at ../../../../nfs/nfs_bio.c:986
986                             KASSERT(i == 0 || iomode == NFSV3WRITE_FILESYNC)
;
(gdb) print i
$10 = 3
(gdb) print iomode
$11 = 0

>How-To-Repeat:
Write large file to NFS filesystem.

>Fix:
Sorry, don't know currently.
>Release-Note:
>Audit-Trail:
>Unformatted: