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Message-Id: <200907071353.n67Drf0m059632@www.freebsd.org>
Date: Tue, 7 Jul 2009 13:53:41 GMT
From: Nikos Vassiliadis <nvass9573@gmx.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: spawning several dhclients in parallel panics the kernel
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>Number:         136426
>Category:       kern
>Synopsis:       [panic] spawning several dhclients in parallel panics the kernel
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    vwe
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jul 07 14:00:09 UTC 2009
>Closed-Date:    Wed Sep 07 16:41:37 UTC 2011
>Last-Modified:  Wed Sep 07 16:41:37 UTC 2011
>Originator:     Nikos Vassiliadis
>Release:        8.0-CURRENT
>Organization:
>Environment:
FreeBSD speed.homeunix.net 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Jul  6 23:30:56 EEST 2009     root@speed.homeunix.net:/usr/obj/mnt/tst/src/sys/GENERIC  i386

>Description:
Spawning many, like 20, dhclients in parallel results to kernel panic.
(kgdb) bt
#0  doadump () at pcpu.h:246
#1  0xc0874a7e in boot (howto=260) at /mnt/tst/src/sys/kern/kern_shutdown.c:419
#2  0xc0874d52 in panic (fmt=Variable "fmt" is not available.
) at /mnt/tst/src/sys/kern/kern_shutdown.c:575
#3  0xc04c4477 in db_panic (addr=Could not find the frame base for "db_panic".
) at /mnt/tst/src/sys/ddb/db_command.c:478
#4  0xc04c4aa1 in db_command (last_cmdp=0xc0d790bc, cmd_table=0x0, dopager=1) at /mnt/tst/src/sys/ddb/db_command.c:445
#5  0xc04c4bfa in db_command_loop () at /mnt/tst/src/sys/ddb/db_command.c:498
#6  0xc04c6a5d in db_trap (type=3, code=0) at /mnt/tst/src/sys/ddb/db_main.c:229
#7  0xc08a2ab6 in kdb_trap (type=3, code=0, tf=0xcd492a48) at /mnt/tst/src/sys/kern/subr_kdb.c:534
#8  0xc0b99efb in trap (frame=0xcd492a48) at /mnt/tst/src/sys/i386/i386/trap.c:685
#9  0xc0b7c41b in calltrap () at /mnt/tst/src/sys/i386/i386/exception.s:165
#10 0xc08a2c3a in kdb_enter (why=0xc0c58f38 "panic", msg=0xc0c58f38 "panic") at cpufunc.h:71
#11 0xc0874d36 in panic (fmt=0xc0bf52d3 "Bad link elm %p prev->next != elm") at /mnt/tst/src/sys/kern/kern_shutdown.c:558
#12 0xc096bcaf in in_control (so=0xc300bce0, cmd=2149607705, data=0xc2f92300 "rl0", ifp=0xc2a7e400, td=0xc3058900) at /mnt/tst/src/sys/netinet/in.c:594
#13 0xc0920f50 in ifioctl (so=0xc300bce0, cmd=2149607705, data=0xc2f92300 "rl0", td=0xc3058900) at /mnt/tst/src/sys/net/if.c:2302
#14 0xc08bed25 in soo_ioctl (fp=0xc2f84dc8, cmd=2149607705, data=0xc2f92300, active_cred=0xc296d100, td=0xc3058900) at /mnt/tst/src/sys/kern/sys_socket.c:212
#15 0xc08b93cd in kern_ioctl (td=0xc3058900, fd=3, com=2149607705, data=0xc2f92300 "rl0") at file.h:262
#16 0xc08b9554 in ioctl (td=0xc3058900, uap=0xcd492cf8) at /mnt/tst/src/sys/kern/sys_generic.c:678
#17 0xc0b99633 in syscall (frame=0xcd492d38) at /mnt/tst/src/sys/i386/i386/trap.c:1073
#18 0xc0b7c480 in Xint0x80_syscall () at /mnt/tst/src/sys/i386/i386/exception.s:261
#19 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

>How-To-Repeat:
Spawn many dhclients in parallel:
dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 & dhclient rl0 &

>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-bugs->freebsd-net 
Responsible-Changed-By: gavin 
Responsible-Changed-When: Wed Sep 23 09:02:03 UTC 2009 
Responsible-Changed-Why:  
Over to maintainer(s).  To submitter: Can you still recreate this on 
a recent -CURRENT?  It looks like this may be a race that has already 
been fixed. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=136426 

From: Nikos Vassiliadis <nvass9573@gmx.com>
To: bug-followup@FreeBSD.org, nvass9573@gmx.com, gavin@freebsd.org
Cc:  
Subject: Re: kern/136426: [panic] spawning several dhclients in parallel panics
 the kernel
Date: Tue, 09 Mar 2010 15:43:59 +0200

 Sorry for the really delayed response,
 
 The panic is still there on my mid-February/2010 -CURRENT box.
 

From: Nikos Vassiliadis <nvass9573@gmx.com>
To: bug-followup@FreeBSD.org, nvass9573@gmx.com
Cc:  
Subject: Re: kern/136426: [panic] spawning several dhclients in parallel panics
 the kernel
Date: Wed, 07 Sep 2011 17:23:18 +0300

 Please close this PR. It must have been hardware specific. I don't have
 that hardware anymore.
 
 Thanks, Nikos
 
 
State-Changed-From-To: open->closed 
State-Changed-By: vwe 
State-Changed-When: Wed Sep 7 16:39:59 UTC 2011 
State-Changed-Why:  

closing this per submitters request 
thank you for reporting, Nikos 


Responsible-Changed-From-To: freebsd-net->vwe 
Responsible-Changed-By: vwe 
Responsible-Changed-When: Wed Sep 7 16:39:59 UTC 2011 
Responsible-Changed-Why:  
track 

http://www.freebsd.org/cgi/query-pr.cgi?pr=136426 
>Unformatted:
