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Date: Tue, 11 Feb 1997 19:19:04 -0800 (PST)
From: futagi@csctk.jcsnet.or.jp
To: freebsd-gnats-submit@freebsd.org
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Subject: kern/2717: Panic with daily script (find)
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>Number:         2717
>Category:       kern
>Synopsis:       Panic with daily script (find)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 11 19:20:01 PST 1997
>Last-Modified:
>Originator:     Masaaki Futagi
>Organization:
Japan Computer Science Co.,Ltd.
>Release:        2.1.6R
>Environment:
FreeBSD csc-wall2.jcsnet.or.jp 2.1.6-RELEASE FreeBSD 2.1.6-RELEASE #10: Wed Feb
12 11:40:07 JST 1997     futagi@csc-wall2.jcsnet.or.jp:/usr/src/sys/compile/JFK
 i386 

We added our original 'firewall' code to some modules in /sys/netinet
This firewall module puts many 'printf' messages to syslog and console.
>Description:
Panic message:

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x0
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xf0127564  (is in cache_lookup() in vfs_cache.o)
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         = 7438 (find)
interrupt mask          =
panic: page fault     

At 02:03 AM when /etc/daily was running.
This problem did not occur everyday.
>How-To-Repeat:
I could not repeat the probloem manually, 
but it occurd not once in midnight.

>Fix:
I found PURGE() procedure (macro)  was called in cache_lookup()/vfs_cache.c

Now I inhibit interrupts while 'PURGE()' and observing.

>Audit-Trail:
>Unformatted: