Date: Tue, 27 May 1997 14:05:31 -0500 From: Karl Denninger <karl@Mcs.Net> To: Doug Rabson <dfr@nlsystems.com> Cc: Bob Bishop <rb@gid.co.uk>, Karl Denninger <karl@Mcs.Net>, current@FreeBSD.ORG Subject: Re: Boom! :-) Message-ID: <19970527140531.12098@Mercury.Mcs.Net> In-Reply-To: <Pine.BSF.3.95q.970527141015.349C-100000@herring.nlsystems.com>; from Doug Rabson on Tue, May 27, 1997 at 02:12:56PM %2B0100 References: <l03020910afb05a09eb52@[194.32.164.2]> <Pine.BSF.3.95q.970527141015.349C-100000@herring.nlsystems.com>
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On Tue, May 27, 1997 at 02:12:56PM +0100, Doug Rabson wrote:
> On Tue, 27 May 1997, Bob Bishop wrote:
>
> > At 0:24 +0100 27/5/97, Karl Denninger wrote:
> > >On Mon, May 26, 1997 at 07:58:28PM +0100, Bob Bishop wrote:
> > >>[...]
> > >> If, as I suspect, 0x8:0xf01119b0 = _lockstatus + 0x8, this is a
> > >> particularly bad case of kern/3581.
> > >>[...]
> > >Hmmm... Don't think so... this looks to be in lockinit...
> >
> > Sure does. Congratulations! Looks like you've found another semi-repeatable
> > way to summon up the lock gremlins! :-) :-) :-{
> >
> > Seriously folks, the size of this club (people who regularly fall down
> > various lock-related holes) seems to be growing. I have a little time to
> > spare at the moment but I'm not up to speed with this stuff, and I have to
> > say it looks unpleasant.
>
> This is a workaround for the lockstatus panic. A better fix will probably
> have to wait until Peter is finished with poll(2).
>
> Index: ufs_vnops.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/ufs/ufs/ufs_vnops.c,v
> retrieving revision 1.50
> diff -u -r1.50 ufs_vnops.c
> --- ufs_vnops.c 1997/05/17 18:32:53 1.50
> +++ ufs_vnops.c 1997/05/27 13:11:19
> @@ -1788,6 +1788,9 @@
> } */ *ap;
> {
>
> + if (ap->a_vp->v_flag & VXLOCK)
> + return TRUE;
> +
> return (lockstatus(&VTOI(ap->a_vp)->i_lock));
> }
>
>
>
> --
> Doug Rabson Mail: dfr@nlsystems.com
> Nonlinear Systems Ltd. Phone: +44 181 951 1891
> Fax: +44 181 381 1039
>
That patch does NOT stop the panics:
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
Copyright (c) 1992-1997 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 3.0-CURRENT #1: Tue May 27 09:55:02 CDT 1997
karl@Codebase.mcs.net:/usr/src/sys/compile/MCS_STANDARD
CPU: Pentium (90.00-MHz 586-class CPU)
Origin = "GenuineIntel" Id = 0x521 Stepping=1
Features=0x5bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,<b10>>
real memory = 67108864 (65536K bytes)
Physical memory hole(s):
avail memory = 62939136 (61464K bytes)
eisa0: <ASU5101 (System Board)>
Probing for devices on the EISA bus
ahb0: <Adaptec 174x SCSI host adapter> at 0x1c00-0x1cff irq 11 on eisa0 slot 1
ahb0: waiting for scsi devices to settle
scbus0 at ahb0 bus 0
sd0 at scbus0 target 0 lun 0
sd0: <MICROP 4110-09TBCU0322L HT01> type 0 fixed SCSI 2
sd0: Direct-Access 1002MB (2053880 512 byte sectors)
sd0: with 2428 cyls, 9 heads, and an average 93 sectors/track
Probing for devices on PCI bus 0:
chip0: <Intel 82434NX (Neptune) PCI cache memory controller> rev 0x11 on pci0.0.0
chip1: <Intel 82375EB PCI-EISA bridge> rev 0x03 on pci0.2.0
de0: <Digital 21140 Fast Ethernet> rev 0x12 int a irq 10 on pci0.6.0
de0: SMC 9332 21140 [10-100Mb/s] pass 1.2
de0: address 00:00:c0:82:ea:e3
de0: enabling 10baseT port
Probing for devices on the ISA bus:
sc0 at 0x60-0x6f irq 1 on motherboard
sc0: VGA color <16 virtual consoles, flags=0x0>
ed0 at 0x280-0x29f irq 3 maddr 0xd0000 msize 16384 on isa
ed0: address 00:00:c0:15:2c:76, type SMC8216T (16 bit)
ed1 not found at 0x300
sio0 not found at 0x3f8
sio1 not found at 0x2f8
sio2: disabled, not probed.
sio3: disabled, not probed.
lpt0 not found
lpt1 not found
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: NEC 72065B
fd0: 1.44MB 3.5in
wdc0 not found at 0x1f0
aha0 not found at 0x330
aic0 not found at 0x340
npx0 on motherboard
npx0: INT 16 interface
ccd0-3: Concatenated disk drivers
WARNING: / was not properly dismounted.
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x10
fault code = supervisor read, page not present
instruction pointer = 0x8:0xf019c831
stack pointer = 0x10:0xf68c2f10
frame pointer = 0x10:0xf68c2f4c
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 4 (update)
interrupt mask =
trap number = 12
panic: page fault
syncing disks...
Fatal trap 12: page fault while in \M^?\^Code
fault virtual address = 0x10
fault code = supervisor read, page not present
instruction pointer = 0x8:0xf019c831
stack pointer = 0x10:0xf68c2da8
frame pointer = 0x10:0xf68c2de4
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 4 (update)
interrupt mask =
trap number = 12
panic: page fault
Automatic reboot in 15 seconds - press a key on the console to abort
f019b720 F ffs_vfsops.o
f019b720 t ___set_vfs_set_sym__fs_vfsconf
f019b7c0 t _ffs_mount
f019bacc t _ffs_reload
f019be68 T _ffs_mountfs
f019c460 t _ffs_oldfscompat
f019c4f4 T _ffs_unmount
f019c640 T _ffs_flushfiles
f019c6a4 T _ffs_statfs
f019c7bc T _ffs_sync <<<< It moves to here.
f019c9a0 T _ffs_vget
f019cc74 T _ffs_fhtovp
f019ccc0 T _ffs_vptofh
f019cce4 t _ffs_init
f019ccf4 t _ffs_sbupdate
f019ce80 F ffs_vnops.o
f019ce80 t ___set_vfs_opv_descs__sym_ffs_vnodeop_opv_desc
f019ce84 t ___set_vfs_opv_descs__sym_ffs_specop_opv_desc
f019ce88 t ___set_vfs_opv_descs__sym_ffs_fifoop_opv_desc
f019ce8c t _sysctl___vfs_ffs
f019ceb0 t ___set_sysctl__vfs_sym_sysctl___vfs_ffs
f019ceb4 t ___set_sysctl__vfs_ffs_sym_sysctl___vfs_ffs
f019ceb8 t _sysctl___vfs_ffs_doclusterread
f019cee4 t ___set_sysctl__vfs_ffs_sym_sysctl___vfs_ffs_doclusterread
f019cee8 t _sysctl___vfs_ffs_doclusterwrite
f019cf14 t ___set_sysctl__vfs_ffs_sym_sysctl___vfs_ffs_doclusterwrite
f019cf18 t _ffs_read
f019d318 t _ffs_write
f019d914 t _ffs_getpages
f019de04 t _ffs_fsync
f019dfd0 T _ffs_reclaim
f019e020 F ufs_bmap.o
The patch masked the symptom, but not the disease.
--
--
Karl Denninger (karl@MCS.Net)| MCSNet - The Finest Internet Connectivity
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