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Re: kern/37425: fss_snapshot_mount panic during fsck
The following reply was made to PR kern/37425; it has been noted by GNATS.
From: Scott Ellis <scotte%warped.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: hannken%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost,
netbsd-bugs%netbsd.org@localhost
Subject: Re: kern/37425: fss_snapshot_mount panic during fsck
Date: Mon, 24 Nov 2008 18:05:23 -0800
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On 11/24/2008 1:45 AM, Juergen Hannken-Illjes wrote:
> The following reply was made to PR kern/37425; it has been noted by GNATS.
>
> From: Juergen Hannken-Illjes<hannken%eis.cs.tu-bs.de@localhost>
> To: gnats-bugs%netbsd.org@localhost
> Cc:
> Subject: Re: kern/37425: fss_snapshot_mount panic during fsck
> Date: Mon, 24 Nov 2008 10:43:48 +0100
>
> On Sun, Nov 23, 2008 at 07:45:02PM +0000, Scott Ellis wrote:
> > The following reply was made to PR kern/37425; it has been noted by
> GNATS.
>
> Please send the following information:
>
> - The exact panic string above ffs_copyonwrite+0x9c
> - The output of dmesg
> - The script you use to test
>
> --
> Juergen Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU
> Braunschweig (Germany)
>
Sure thing.
The panic string is:
uvm_fault(0xffffffff80bf58c0, 0xffff800005ef4000, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff80286987 cs 8 rflags 10206 cr2
ffff800005ef4e00 cpl 0 rsp ffff8000023cac040
kernel: page trap fault, code=0
Stopped in pid 361.1 (fssconfig) at netbsd:ffs_copyonwrite+0x9c: movq 0
(%rdi,%rax,8),%rax
Script used to test is attached (yes, it's a hack, but it was quick to
write!) as pffstest.pl. It requires the directory structure of
/.snapshot/.store to be created, and vnd 11-14 to be available.
Dmesg is attached as vmware.dmesg. It's GENERIC running on VMware.
Don't imagine there's much machine-specific stuff there.
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name="pffstest.pl"
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filename="pffstest.pl"
#!/usr/bin/perl
# Use vnd?? starting at $startvnode, to eliminate conflicts with other
# vnd users on the system
$startvnode=10;
$snapshotdir="/.snapshot";
$snapshotstore="/.snapshot/.store";
$datetime=`date "+%C%y.%m.%d-%H.%M.%S"`;
chomp($datetime);
# Number of generations of backups that should be kept
$generations=5;
fill_vnd();
fill_store();
# If all the vnd are free, use them up!
# Assume this only happens after a fresh reboot
if (scalar(keys %vnd) <= 1)
{
freshstart();
exit(10);
}
rotate();
# Take new snapshot, and attach it to a vnode
if ($vnd{""})
{
$newfile=$snapshotstore."/".$datetime;
# Make a new store file
exec(`fssconfig -c fss0 / $newfile`);
exec(`fssconfig -u fss0`);
# Attach it to the vnode
exec(`vnconfig -r $vnd{""} $newfile`);
# Make a directory and mount it
$newdir=$snapshotdir."/".$datetime;
mkdir($newdir);
exec(`mount -o ro /dev/$vnd{""}a $newdir`);
}
else
{
print "Hey, no free vnodes!\n";
exit(20);
}
##################################################################
sub sort_store {
# Sort the list of files in %store in decending order
@inodesorted= reverse sort { $store{$a} cmp $store{$b} } keys %store;
}
sub fill_vnd {
# Populate vnd list with vnode devices
$i=$startvnode;
while ($i < ($startvnode+$generations))
{
@vntemp=split(" ",`vnconfig -l vnd$i`);
# Add hash entry with key of inode, value of associated vnode
chop($vntemp[0]);
$vnd{$vntemp[4]}=$vntemp[0];
$i++;
}
}
sub fill_store {
# Create list of all store files
@storelist=split('\n',`ls $snapshotstore`);
# Populate store list with list of filenames
$i=0;
while ($storelist[$i])
{
$tempfile=$snapshotstore."/".$storelist[$i];
$tempnode=`stat -f "%i" $tempfile`;
chomp($tempnode);
# Add hash entry with key of inode, value of associated filename
$store{$tempnode}=$tempfile;
$i++;
}
}
sub freshstart {
print "Empty vnd, populating\n";
$i=0;
while (($inode,$filename)=each(%store))
{
$tempvnode=$startvnode+$i;
exec(`vnconfig -r vnd$tempvnode $store{$inode}`);
$i++;
}
}
sub rotate {
# Sort the list of store files, so we can clear old ones out
sort_store();
# See if we need to remove any extra files
$i=0;
while ($currentinode = @inodesorted[$i])
{
if ($i >= ($generations-1))
{
# We have too many files...remove them
print "Removing ";
if ($vnd{$currentinode})
{
# Forcibly unmount it first
$dirname=$snapshotdir."/".`basename
$store{$currentinode}`;
chomp($dirname);
exec(`umount -f $dirname`);
rmdir($dirname);
# Next, remove the vnode association
exec(`vnconfig -u $vnd{$currentinode}`);
# Mark this vnode as clear
$vnd{""}=$vnd{$currentinode};
}
unlink($store{$currentinode});
}
else
{
print "Keeping ";
}
print "File:".$store{@inodesorted[$i]}."
".$vnd{@inodesorted[$i]}."\n";
$i++;
}
}
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Content-Type: text/plain;
name="vmware.dmesg"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="vmware.dmesg"
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008
The NetBSD Foundation, Inc. All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
NetBSD 5.99.02 (GENERIC) #0: Mon Nov 17 20:41:39 PST 2008
scotte@intrepid:/nbu/source/netbsd/src/obj.amd64/nbu/source/netbsd/src/sys/arch/amd64/compile/GENERIC
total memory = 511 MB
avail memory = 481 MB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
SMBIOS rev. 2.4 @ 0xe4010 (45 entries)
VMware, Inc. VMware Virtual Platform (None)
mainbus0 (root)
cpu0 at mainbus0 apid 0: Intel 686-class, 3600MHz, id 0x6fb
cpu1 at mainbus0 apid 1: Intel 686-class, 3600MHz, id 0x6fb
ioapic0 at mainbus0 apid 2: pa 0xfec00000, version 11, 24 pins
acpi0 at mainbus0: Intel ACPICA 20080321
acpi0: X/RSDT: OemId <INTEL ,440BX ,06040000>, AslId <VMW ,01324272>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
timecounter: Timecounter "ACPI-Safe" frequency 3579545 Hz quality 900
ACPI-Safe 24-bit timer
PIC (PNP0001) at acpi0 not configured
attimer1 at acpi0 (TIME, PNP0100): AT Timer
attimer1: io 0x40-0x43 irq 0
pcppi1 at acpi0 (SPKR, PNP0800)
pcppi1: io 0x61
midi0 at pcppi1: PC speaker (CPU-intensive output)
sysbeep0 at pcppi1
pckbc1 at acpi0 (KBC, PNP0303): kbd port
pckbc1: io 0x60,0x64 irq 1
pckbc2 at acpi0 (MOUS, PNP0F13): aux port
pckbc2: irq 12
LPTB (PNP0400) at acpi0 not configured
COMA (PNP0501) at acpi0 not configured
COMB (PNP0501) at acpi0 not configured
FDC (PNP0700) at acpi0 not configured
acpiacad0 at acpi0 (ACAD, ACPI0003-1): ACPI AC Adapter
attimer1: attached to pcppi1
pckbd0 at pckbc1 (kbd slot)
pckbc1: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
pms0 at pckbc1 (aux slot)
pckbc1: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pci0 at mainbus0 bus 0: configuration mode 1
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
pchb0 at pci0 dev 0 function 0
pchb0: vendor 0x8086 product 0x7190 (rev. 0x01)
ppb0 at pci0 dev 1 function 0: vendor 0x8086 product 0x7191 (rev. 0x01)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
pcib0 at pci0 dev 7 function 0
pcib0: vendor 0x8086 product 0x7110 (rev. 0x08)
piixide0 at pci0 dev 7 function 1
piixide0: Intel 82371AB IDE controller (PIIX4) (rev. 0x01)
piixide0: bus-master DMA support present
piixide0: primary channel configured to compatibility mode
piixide0: primary channel interrupting at ioapic0 pin 14
atabus0 at piixide0 channel 0
piixide0: secondary channel configured to compatibility mode
piixide0: secondary channel ignored (disabled)
piixpm0 at pci0 dev 7 function 3
piixpm0: vendor 0x8086 product 0x7113 (rev. 0x08)
timecounter: Timecounter "piixpm0" frequency 3579545 Hz quality 1000
piixpm0: 24-bit timer
piixpm0: SMBus disabled
vga0 at pci0 dev 15 function 0: vendor 0x15ad product 0x0405 (rev. 0x00)
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
drm at vga0 not configured
mpt0 at pci0 dev 16 function 0: vendor 0x1000 product 0x0030
mpt0: applying 1030 quirk
mpt0: interrupting at ioapic0 pin 17
scsibus0 at mpt0: 16 targets, 8 luns per target
ppb1 at pci0 dev 17 function 0: vendor 0x15ad product 0x0790 (rev. 0x02)
pci2 at ppb1 bus 2
pci2: i/o space, memory space enabled, rd/line, wr/inv ok
wm0 at pci2 dev 0 function 0: Intel i82545EM 1000BASE-T Ethernet, rev. 1
wm0: interrupting at ioapic0 pin 18
wm0: 32-bit 66MHz PCI bus
wm0: 256 word (8 address bits) MicroWire EEPROM
wm0: Ethernet address 00:0c:29:2b:56:65
makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 3
makphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT,
1000baseT-FDX, auto
isa0 at pcib0
lpt0 at isa0 port 0x378-0x37b irq 7
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
ERROR: 305 cycle TSC drift observed
acpiacad0: AC adapter online.
scsibus0: waiting 2 seconds for devices to settle...
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
atapibus0 at atabus0: 2 targets
cd0 at atapibus0 drive 1: <VMware Virtual IDE CDROM Drive,
0100000000000000000, 0000000> cdrom removable
cd0: 32-bit data port
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
wd0 at atabus0 drive 0: <VMware Virtual IDE Hard Drive>
wd0: drive supports 64-sector PIO transfers, LBA addressing
wd0: 2048 MB, 4161 cyl, 16 head, 63 sec, 512 bytes/sect x 4194304 sectors
wd0: 32-bit data port
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
cd0(piixide0:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
Kernelized RAIDframe activated
pad0: outputs: 44100Hz, 16-bit, stereo
audio0 at pad0: half duplex
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)
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