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Date: Tue, 14 Sep 2004 00:48:51 -0700
From: Julian Elischer <julian@elischer.org>
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To: Andrew Gallatin <gallatin@cs.duke.edu>
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cc: John Baldwin <jhb@freebsd.org>
cc: freebsd-threads@freebsd.org
Subject: Re: Unkillable KSE threaded proc
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Andrew Gallatin wrote:
> Julian Elischer writes:
>  > I think that this would possibly GO AWAY of you disab;ed preemption. 
>  > which would make it very hard to debug :-)
> 
> Nope, still happens w/o preempt..  And its the "worse" problem of deadlocking
> the system rather than just having the process fail to exit.
> 
> db> ps
>   pid   proc     uarea   uid  ppid  pgrp  flag   stat  wmesg    wchan  cmd
>   579 c37e41c0 e8855000 1387   578   579 0004002 [SLPQ ttyin 0xc17df810][SLP] csh
>   578 c1817540 e671a000 1387   576   576 0000100 [SLPQ select 0xc06cb704][SLP] sshd
>   576 c37e4540 e8857000    0   451   576 0000100 [SLPQ sbwait 0xc1983e84][SLP] sshd
>   566 c1a1fc40 e67ba000 1387     1   564 000c482 (threaded)  mx_pingpong
>    thread 0xc37944b0 ksegrp 0xc1a20460 [CPU 0]
>    thread 0xc3794640 ksegrp 0xc1a20460 [SUSP]
>    thread 0xc187e320 ksegrp 0xc1a20460 [RUNQ]
>    thread 0xc187e4b0 ksegrp 0xc187fee0 [CPU 1]
> 

[...]

can you reconfirm that this probelm exists without preemption with today's -current?