Date: Sun, 4 Apr 1999 13:20:02 -0700 (PDT) From: Bob Willcox <bob@luke.pmr.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/10872: Panic in sorecieve() due to NULL mbuf pointer Message-ID: <199904042020.NAA52596@freefall.freebsd.org>
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The following reply was made to PR kern/10872; it has been noted by GNATS.
From: Bob Willcox <bob@luke.pmr.com>
To: freebsd-gnats-submit@freebsd.org
Cc:
Subject: Re: kern/10872: Panic in sorecieve() due to NULL mbuf pointer
Date: Sun, 4 Apr 1999 15:15:05 -0500
--/9DWx/yDrRhgMJTb
Content-Type: text/plain; charset=us-ascii
I have been able to further isolate this problem to probable interaction
between network and SCSI activity.
Attached is a small test script with which I have been able to easily
recreate the panic (w/o involving amanda). Key to recreating the panic
is to run the test script so that it is writing to two different files
on the same filesystem of the target system simultaneously (I could not
make it fail when writing to different filesystems or /dev/null).
You can run the two invocations from the same or different source
systems (seems to cause the panic more quickly if run from different
systems).
Note that I have pretty much ruled out hardware as I completely replaced
the hardware of my backup server system (and my test system for this
panic) and still get the same panic.
I have been running this script as follows:
./panic_test 5 65536 deathstar /stuff2/tmp/junk1 &
./panic_test 5 65536 deathstar /stuff2/tmp/junk2 &
from either the same or different source systems. This will attempt to
write two 2GB files (junk1 and junk2) on the /stuff2 filesystem (one of
the holding disk filesystems) on deathstar.
For the record, here is the dmesg output for deathstar:
Copyright (c) 1992-1999 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.1-STABLE #6: Sun Apr 4 11:56:38 CDT 1999
root@deathstar.pmr.com:/usr/src/sys/compile/DEATHSTAR
Timecounter "i8254" frequency 1193182 Hz
Timecounter "TSC" frequency 400909762 Hz
CPU: AMD-K6(tm) 3D processor (400.91-MHz 586-class CPU)
Origin = "AuthenticAMD" Id = 0x58c Stepping=12
Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX>
real memory = 67043328 (65472K bytes)
avail memory = 62144512 (60688K bytes)
Preloaded elf kernel "kernel" at 0xf02d4000.
Probing for devices on PCI bus 0:
chip0: <AcerLabs M1541 (Aladdin-V) PCI host bridge> rev 0x04 on pci0.0.0
chip1: <AcerLabs M5243 PCI-PCI bridge> rev 0x04 on pci0.1.0
chip2: <PCI to 0x80 bridge (vendor=10b9 device=7101)> rev 0x00 on pci0.3.0
chip3: <AcerLabs M1533 portable PCI-ISA bridge> rev 0xc3 on pci0.7.0
ncr0: <ncr 53c875 fast20 wide scsi> rev 0x03 int a irq 5 on pci0.10.0
ncr1: <ncr 53c810a fast10 scsi> rev 0x12 int a irq 10 on pci0.11.0
fxp0: <Intel EtherExpress Pro 10/100B Ethernet> rev 0x01 int a irq 11 on pci0.12.0
fxp0: Ethernet address 00:a0:c9:00:53:29
ide_pci0: <Acer Aladdin IV/V (M5229) Bus-master IDE controller> rev 0xc1 int a irq 0 on pci0.15.0
Probing for devices on PCI bus 1:
vga0: <Matrox model 0521 graphics accelerator> rev 0x01 int a irq 11 on pci1.0.0
Probing for devices on the ISA bus:
sc0 on isa
sc0: VGA color <16 virtual consoles, flags=0x0>
atkbdc0 at 0x60-0x6f on motherboard
atkbd0 irq 1 on isa
psm0 not found
sio0 at 0x3f8-0x3ff irq 4 flags 0x10 on isa
sio0: type 16550A
sio1 at 0x2f8-0x2ff irq 3 on isa
sio1: type 16550A
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: FIFO enabled, 8 bytes threshold
fd0: 1.44MB 3.5in
wdc0 at 0x1f0-0x1f7 irq 14 flags 0xb0ffb0ff on isa
wdc0: unit 0 (wd0): <ST34310A>, LBA, DMA, 32-bit, multi-block-16
wd0: 4111MB (8420832 sectors), 524 cyls, 255 heads, 63 S/T, 512 B/S
ppc0 at 0x378 irq 7 on isa
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/7 bytes threshold
nlpt0: <generic printer> on ppbus 0
nlpt0: Interrupt-driven port
ppi0: <generic parallel i/o> on ppbus 0
plip0: <PLIP network interface> on ppbus 0
vga0 at 0x3b0-0x3df maddr 0xa0000 msize 131072 on isa
npx0 on motherboard
npx0: INT 16 interface
Waiting 10 seconds for SCSI devices to settle
sa0 at ncr1 bus 0 target 1 lun 0
sa0: <EXABYTE EXB-89008E000204 V38b> Removable Sequential Access SCSI-2 device
sa0: 10.000MB/s transfers (10.000MHz, offset 8)
changing root device to wd0s1a
WARNING: / was not properly dismounted
ch0 at ncr1 bus 0 target 0 lun 0
ch0: <EXABYTE EXB-210 5.00> Removable Changer SCSI-2 device
ch0: 3.300MB/s transfers
ch0: 11 slots, 1 drive, 1 picker, 0 portals
da1 at ncr0 bus 0 target 8 lun 0
da1: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device
da1: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da1: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
da0 at ncr0 bus 0 target 0 lun 0
da0: <IBM DDRS-39130D DC1B> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 15, 16bit), Tagged Queueing Enabled
da0: 8715MB (17850000 512 byte sectors: 255H 63S/T 1111C)
ffs_mountfs: superblock updated for soft updates
ffs_mountfs: superblock updated for soft updates
ffs_mountfs: superblock updated for soft updates
ffs_mountfs: superblock updated for soft updates
ffs_mountfs: superblock updated for soft updates
fxp0: promiscuous mode enabled
--
Bob Willcox The man who follows the crowd will usually get no
bob@luke.pmr.com further than the crowd. The man who walks alone is
Austin, TX likely to find himself in places no one has ever
been. -- Alan Ashley-Pitt
--/9DWx/yDrRhgMJTb
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename=panic_test
#!/bin/sh
if [ $# -ne 4 ]; then
echo "Usage: sor_test loopcnt blkcnt host path"
exit 1
fi
lpcnt=$1
blkcnt=$2
host=$3
path=$4
i=1
while [ $i -le $lpcnt ]
do
cmd="dd count=$blkcnt bs=32k if=/dev/zero|rsh $host \"dd bs=32k of=$path\""
echo "$i: $cmd"
eval $cmd
i=`expr $i + 1`
done
--/9DWx/yDrRhgMJTb--
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