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Message-Id: <200509081117.j88BH8nk082344@www.freebsd.org>
Date: Thu, 8 Sep 2005 11:17:08 GMT
From: Anon <grfgguvf@gmail.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Lock order reversal in 6.0-BETA3
X-Send-Pr-Version: www-2.3

>Number:         85864
>Category:       kern
>Synopsis:       Lock order reversal in 6.0-BETA3
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bz
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Sep 08 11:20:12 GMT 2005
>Closed-Date:    Thu Sep 08 21:12:41 GMT 2005
>Last-Modified:  Thu Sep 08 21:12:41 GMT 2005
>Originator:     Anon
>Release:        6.0-BETA3
>Organization:
>Environment:
FreeBSD XXX 6.0-BETA3 FreeBSD 6.0-BETA3 #0: Mon Aug 22 22:59:46 UTC 2005     root@harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
lock order reversal
 1st 0xc097ca00 UMA lock (UMA lock) @ /usr/src/sys/vm/uma_core.c:1494
 2nd 0xc1060144 system map (system map) @ /usr/src/sys/vm/vm_map.c:2317
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c0931ab8,c0931bf8,c08bc1c4) at kdb_backtrace+0x29
witness_checkorder(c1060144,9,c087273f,90d) at witness_checkorder+0x564
_mtx_lock_flags(c1060144,0,c087273f,90d) at _mtx_lock_flags+0x5b
_vm_map_lock(c10600c0,c087273f,90d) at _vm_map_lock+0x26
vm_map_remove(c10600c0,c19f2000,c19f3000,c8393c0c,c077fba9) at vm_map_remove+0x1f
kmem_free(c10600c0,c19f2000,1000,c8393c3c,c077f556) at kmem_free+0x25
page_free(c19f2000,1000,2) at page_free+0x29
zone_drain(c103fd20) at zone_drain+0x26a
zone_foreach(c077f2ec,c8393cec,c07914d7,c8393c74,246) at zone_foreach+0x37
uma_reclaim(c8393c74,246,0,c8393c80,c062a4f5) at uma_reclaim+0x12
vm_pageout_scan(0,c097ce60,0,c0873c2c,604) at vm_pageout_scan+0x103
vm_pageout(0,c8393d38,0,c079232c,0) at vm_pageout+0x2c3
fork_exit(c079232c,0,c8393d38) at fork_exit+0xa0
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xc8393d6c, ebp = 0 ---
pid 5094 (xterm-static), uid 0: exited on signal 6

>How-To-Repeat:
The last line may or may not be related
>Fix:
I don't know enough about kernel hacking to debug this alone, sorry.
However if more information is required I'd be happy to provide it
>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: bz 
State-Changed-When: Thu Sep 8 21:10:48 GMT 2005 
State-Changed-Why:  
This LOR is well known and currently reported about once a day. 
See http://sources.zabbadoz.net/freebsd/lor.html#109 


Responsible-Changed-From-To: freebsd-bugs->bz 
Responsible-Changed-By: bz 
Responsible-Changed-When: Thu Sep 8 21:10:48 GMT 2005 
Responsible-Changed-Why:  
Assign to me in case of followups. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=85864 
>Unformatted:
