From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.9-rc2-mm4 ps hang ?
Date: Fri, 1 Oct 2004 12:09:26 -0700 [thread overview]
Message-ID: <20041001120926.4d6f58d5.akpm@osdl.org> (raw)
In-Reply-To: <1096646925.12861.50.camel@dyn318077bld.beaverton.ibm.com>
Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> I randomly see "ps" hangs on my AMD64 system running 2.6.9-rc2-mm4.
> I don't remember seeing this on earlier kernels. Is this something
> known/fixed ?
hm. I can see that access_process_vm() is doing lock_page() inside
mmap_sem, which is a ranking bug, but it's not that.
And I see a distinct lack of flush_foo_page() calls after the by-hand
modification of the user page. But it's not that either.
Can you work out who is holding mmap_sem for writing?
next prev parent reply other threads:[~2004-10-01 19:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-01 16:08 2.6.9-rc2-mm4 ps hang ? Badari Pulavarty
2004-10-01 19:09 ` Andrew Morton [this message]
2004-10-01 20:06 ` Hugh Dickins
2004-10-01 20:59 ` Andrew Morton
2004-10-01 21:29 ` Badari Pulavarty
2004-10-01 21:55 ` Andrew Morton
2004-10-01 23:06 ` Badari Pulavarty
2004-10-01 23:49 ` Andrew Morton
2004-10-02 0:13 ` Peter Williams
2004-10-02 0:19 ` Badari Pulavarty
2004-10-02 0:44 ` Andrew Morton
2004-10-04 15:43 ` Badari Pulavarty
2004-10-02 0:29 ` Badari Pulavarty
2004-10-02 0:42 ` Andrew Morton
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