panic: kmem_malloc(4096): kmem_map too small

Hi,

On a 5.1-RELEASE machine I have been able to cause a panic like this:

panic: kmem_malloc(4096): kmem_map too small: 28610560 total allocated

The machine is an old 300MHz Celeron with 64M Ram. I get the panic by
un-taring a "huge" .tgz file onto a vinum partition which is on a scsi
disk behind a Adaptec 2940 controller. The "huge" tar file contains a
"normal user" 5.1 installation plus the 5.1-RELEASE bits from the ftp
site, so it is a 320 Meg .tgz. I have played around a bit. It seems
to panic a little quicker if the machine have only 32M Ram. I haven't
been able to panic it if I do it in a normal, non-vinum partition. I
don't know if vinum is at fault though, it might just help to agravate
the situation.

Here follow the output of vinum list and then the panic message and 
a gdb traceback. I'm not sure if the traceback is correct. I think
it only show the second panic.

John
-- 
John Hay -- John.Hay_at_icomtek.csir.co.za / jhay_at_FreeBSD.org

The output of vinum list:

###########################
1 drives:
D vd0                   State: up	/dev/da0s1d	A: 0/966 MB (0%)

1 volumes:
V root                  State: up	Plexes:       1	Size:        966 MB

1 plexes:
P root.p0             C State: up	Subdisks:     1	Size:        966 MB

1 subdisks:
S root.p0.s0            State: up	D: vd0          Size:        966 MB
###########################

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panic: free locked buf
panic messages:
---
panic: kmem_malloc(4096): kmem_map too small: 28610560 total allocated

syncing disks, buffers remaining... panic: free locked buf
Uptime: 1h47m5s
(da0:ahc0:0:6:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0 
(da0:ahc0:0:6:0): error code 54
Dumping 64 MB
ata0: resetting devices ..
done
 16 32 48
---
Reading symbols from /usr/src/sys/i386/compile/TRY/modules/usr/src/sys/modules/vinum/vinum.ko.debug...done.
Loaded symbols for /usr/src/sys/i386/compile/TRY/modules/usr/src/sys/modules/vinum/vinum.ko.debug
#0  doadump () at ../../../kern/kern_shutdown.c:238
238		dumping++;
(kgdb) bt
#0  doadump () at ../../../kern/kern_shutdown.c:238
#1  0xc01ab1ca in boot (howto=260) at ../../../kern/kern_shutdown.c:370
#2  0xc01ab483 in panic () at ../../../kern/kern_shutdown.c:543
#3  0xc1064926 in freerq (rq=0xc166c4c0)
    at /usr/src/sys/dev/vinum/vinuminterrupt.c:252
#4  0xc106482a in complete_rqe (bp=0xc12a6c24)
    at /usr/src/sys/dev/vinum/vinuminterrupt.c:230
#5  0xc01eda81 in bufdone (bp=0xc12a6c24) at ../../../kern/vfs_bio.c:3086
#6  0xc01ed984 in bufdonebio (bp=0x0) at ../../../kern/vfs_bio.c:3034
#7  0xc01ed7e2 in biodone (bp=0xc12a6c24) at ../../../kern/vfs_bio.c:2961
#8  0xc017d4be in g_dev_done (bp2=0xc1552120) at ../../../geom/geom_dev.c:391
#9  0xc01ed7e2 in biodone (bp=0xc1552120) at ../../../kern/vfs_bio.c:2961
#10 0xc017fc62 in g_io_schedule_up (tp=0xc0607e40)
    at ../../../geom/geom_io.c:365
#11 0xc017fe58 in g_up_procbody () at ../../../geom/geom_kern.c:91
#12 0xc01986ce in fork_exit (callout=0xc017fe30 <g_up_procbody>, arg=0x0, 
    frame=0x0) at ../../../kern/kern_fork.c:768
(kgdb) quit