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kernel/1804: Networking Panic in 2.9


>Number:         1804
>Category:       kernel
>Synopsis:       panic: in_cksum: mp == NULL during heavy network I/O
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   unknown
>Arrival-Date:   Mon Apr 30 23:40:01 MDT 2001
>Last-Modified:
>Originator:     Erik Fichtner <emf@servervault.com>
>Organization:
net
>Release:        2.9-current
>Environment:
        System      : OpenBSD 2.9
        Architecture: OpenBSD.i386
        Machine     : i386
>Description:

	During heavy network I/O (several cvs updates, plus assorted other
	traffic through routing NAT firewall), the system gave up the ghost
	with the following:

panic: in_cksum: mp == NULL
Stopped at _Debugger+0x4: movl %ebp, %esp

ddb> trace
_Debugger(2,eeeb5884,1,e0916d80,ef60db08,e01c86db,0,e01d72b9,e023af94,252d4,53,
14,ef60da1c,e018ddf4,e0941e80,53,ef60da2c,e091be90,e091be80,e0916d80,ef60db08,
350f3419,2,c5c02d43,ef60da5c,e0196172,e0941e80,eeeb5820,eeeb5834,e019615c,
ef60db08,eeeb5820,e091be80,1,9609,e08e9d00,e0916d80,e0191159,eeeb5834,eeeb5834,
ef60daac,e0191507,eeeb5820,ef60db08,e0916d80,1,0,500a,ef60db08,0,6eb5820,
e08584c0,7404a8c0,1,e0760e3c,eeeb5844,c1641500,eeeb5834,7404a8c0,1,ef60db5c)
at _Debugger+0x4
_panic(e023af94,252d4,53,14,ef60da1c) at _panic+0x81


matching kcore and kernel available for debugging purposes. 


>How-To-Repeat:
	...hasn't happened again... yet...

>Fix:


- -- 
Erik Fichtner
Security Administrator, ServerVault, Inc.
703-333-5900
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