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AUSCERT External Security Bulletin Redistribution
ESB-2007.0039 -- [Solaris]
Solaris 10 System Panics May be Seen Under High TCP/IP
Stress Due to Race Conditions While Closing TCP Instances
15 February 2007
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: tcp_close
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102551-1
Revision History: February 15 2007: Various updates including changes to
the resolution and the
relief/workaround sections.
January 22 2007: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Sun(sm) Alert Notification
* Sun Alert ID: 102551
* Synopsis: Solaris 10 System Panics May be Seen Under High TCP/IP
Stress Due to Race Conditions While Closing TCP Instances
* Category: Availability
* Product: Solaris 10 Operating System
* BugIDs: 6404207
* Avoidance: Patch
* State: Resolved
* Date Released: 09-Aug-2006, 13-Feb-2007
* Date Closed: 13-Feb-2007
* Date Modified: 19-Jan-2007, 13-Feb-2007
1. Impact
Systems may experience a race condition in the tcp_close() function
which will result in a system panic.
The following Sun Alerts describe TCP/IP issues for the new SPARC
systems which use CMT processors.
* Sun Alert ID: 102551
* Sun Alert ID: 102553
* Sun Alert ID: 102554
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 119998-01
x86 Platform
* Solaris 10 without patch 119999-02
Notes: Solaris 8 and 9 are not impacted by this issue.
Extremely heavy TCP/IP loads with many tens of thousands of rapidly
opening/closing TCP connections.
CMT processors (Chip Multi-Threading technology) are more likely to
sustain the throughput required, while still being able to context
switch rapidly enough to reproduce this. It is highly unlikely that
this issue will be seen on other systems.
There are two classes of system using CMT processors. These can be
identified using the following commands:
a) Systems with Sun4v kernel architecture use CMT processors.
These are identified by the command:
% uname -m
which will return "sun4v".
b) UltraSPARC IV and UltraSPARC IV+ systems use CMT processors.
These are identified by the command:
% prtconf -pv | grep "SUNW,UltraSPARC-IV"
which will return a non-NULL result something similar to: compatible:
'SUNW,UltraSPARC-IV'.
3. Symptoms
Several symptoms are seen when threads race to close/free a TCP eager.
a) A panic string and stacktrace similar to the following:
BAD TRAP: type=31 rp=2a104df53f0 addr=0 mmu_fsr=0 occurred
in module "unix" due to a NULL pointer dereference
atomic_add_int_nv+0x0(0x0, 0xffffffffffffffff)
crfree+0xc(0x0, , 0x0, 0x3000aad3a88, 0x3000134e000)
tcp_close+0x144(0x6002df0cb48, 0x3, 0x600362c2318)
qdetach+0x90(0x6002df0cb48, 0x1, 0x3, 0x600362c2318, 0x0)
strclose+0x3c0(0x30015add440, 0x3, 0x600362c2318)
socktpi_close+0x158(0x30015add440, 0x3, 0x1, 0x0, 0x600362c2318)
fop_close+0x20(0x30015add440, 0x3, 0x1, 0x0, 0x600362c2318)
closef+0x4c(0x60013c19f80)
closeandsetf+0x37c(0x7, 0x0)
close+0x8(, 0xff233244, 0xc6000, 0xd2fc8, 0x5449fd11, 0x0)
syscall_trap32+0xcc()
b) A panic string and one of the two following stacktraces:
panic string: CONN_DEC_REF: connp(60024197840) has ref = 0
------
panicsys+0x48(0x13b37d8, 0x2a100ba19d0, 0x1844e20, 0x1, ...
vpanic_common+0x78(0x13b37d8, 0x2a100ba19d0, ...
cmn_err+0x98(0x3, 0x13b37d8, 0x60024197840, ...
squeue_drain+0x2e0(0x60001935480, 0x2, 0x3a7a, , , 0x3a79)
squeue_worker+0x88(0x60001935480, 0x0)
thread_start+0x4()
------
------
panicsys+0x48(0x1076058, 0x2a1113775c8, 0x1844c20, ...
vpanic_common+0x78(0x1076058, 0x2a1113775c8, ...
panic+0x1c(0x1076058, 0x181c430, 0x3002d9ad1e0, ...
mutex_enter(0x3002d9ad1e0) ...
tcp_close+0x84(0x313c64a4ff8, ...
qdetach+0x90(0x313c64a4ff8, 0x1, ...
strclose+0x3c0(0x3005c8ab1c0, 0x3, ...
socktpi_close+0xe4(0x3005c8ab1c0, ...
fop_close+0x20(0x3005c8ab1c0, 0x3, ...
closef+0x4c(0x313bfc555e0)
closeandsetf+0x37c(0x7, 0x0)
close+0x8(, 0xff233244, 0xc7400...
syscall_trap32+0xcc()
------
4. Relief/Workaround
There is no workaround. Please see Resolution section below.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 119998-01 or later
x86 Platform
* Solaris 10 with patch 119999-02 or later
Change History
19-Jan-2007:
* Updated Relief/Workaround section with Temporary patches
13-Feb-2007:
* Removed CR 102551 which is addressed in Sun Alert 102796
* Updated Contributing Factors, Relief/Workaround and Resolutions
sections
* State: Resolved
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
- --------------------------END INCLUDED TEXT--------------------
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