Date: Mon, 12 May 1997 12:41:10 +0100 From: Bob Bishop <rb@gid.co.uk> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/3581: trap 12 in lockstatus() Message-ID: <11992.199705121141@seagoon.gid.co.uk> Resent-Message-ID: <199705121200.FAA15300@hub.freebsd.org>
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>Number: 3581
>Category: kern
>Synopsis: intermittent trap 12 in lockstatus()
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon May 12 05:00:01 PDT 1997
>Last-Modified:
>Originator: Bob Bishop
>Organization:
GID ltd
>Release: FreeBSD 3.0-CURRENT i386
>Environment:
-current from CTM src-cur.2880
Kernel is generic except for no cpu I386_CPU and
built with DDB and config -g. The problem also occurs
without DDB and -g.
FreeBSD 3.0-CURRENT #0: Sun May 11 16:12:44 BST 1997
rb@hal:/source/cleansrc/sys/compile/HAL
CPU: Cyrix 486DX2 (486-class CPU)
Origin = "CyrixInstead" Device ID = 0x321b Stepping=3
Revision=2
real memory = 20971520 (20480K bytes)
avail memory = 8351744 (8156K bytes)
bdevsw_add_generic: adding D_DISK flag for device 7
bdevsw_add_generic: adding D_DISK flag for device 16
bdevsw_add_generic: adding D_DISK flag for device 17
Probing for devices on the ISA bus:
**** "disabled", "not probed", "not found" omitted for clarity
sc0 at 0x60-0x6f irq 1 on motherboard
sc0: VGA color <16 virtual consoles, flags=0x0>
sio0 at 0x3f8-0x3ff irq 4 on isa
sio0: type 16450
sio1 at 0x2f8-0x2ff irq 3 on isa
sio1: type 16450
lpt0 at 0x378-0x37f irq 7 on isa
lpt0: Interrupt-driven port
lp0: TCP/IP capable interface
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: NEC 72065B
fd0: 1.44MB 3.5in
aha0 at 0x330-0x333 irq 11 drq 5 on isa
aha0: waiting for scsi devices to settle
scbus0 at aha0 bus 0
sd0 at scbus0 target 3 lun 0
sd0: <IBM DCAS-32160 S60B> type 0 fixed SCSI 2
sd0: Direct-Access 2063MB (4226725 512 byte sectors)
1 3C5x9 board(s) on ISA found at 0x300
ep0 at 0x300-0x30f irq 10 on isa
ep0: aui/utp/bnc[*BNC*] address 00:a0:24:c4:f3:62
npx0 on motherboard
npx0: INT 16 interface
>Description:
Every so often (3-4 days), apparently uncorrelated with machine
activity, I get:
Fatal trap 12: page fault while in kernel mode.
It's always in lockstatus(), the following trace is
typical:
lockstatus(lkp=34)
ufs_islocked(ap=f409bf54)
vfs_msync(mp=f0f1aa00, flags=2)
sync()
vfs_update()
[etc]
lockstatus' argument is clearly bogus, small values
like 0x34, 0x44 are typical.
>How-To-Repeat:
Fire up -current on this machine and wait patiently...
>Fix:
Dunno. Assuming it keeps on happening I can probably
collect more data if anyone has any ideas. However, I
can't get a crash dump out of this machine at present,
it wedges just after starting to dump.
>Audit-Trail:
>Unformatted:
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