From: Blaisorblade <blaisorblade@yahoo.it>
To: user-mode-linux-devel@lists.sourceforge.net
Cc: "Sven Köhler" <skoehler@upb.de>
Subject: Re: [uml-devel] errors in uml-guest log
Date: Thu, 10 Nov 2005 12:38:46 +0100 [thread overview]
Message-ID: <200511101238.47223.blaisorblade@yahoo.it> (raw)
In-Reply-To: <dkuq7o$u24$1@sea.gmane.org>
On Thursday 10 November 2005 07:43, Sven Köhler wrote:
> Hi,
>
> an UML-guest-kernel 2.6.14 (without any additional patches) is running
> on a host with kernel 2.6.12.3-skas3-v8.2 host.
> Can anybody explain this error-message to me,
Yes, I can.
In short: don't worry, I get it too at times and I must just remove this
warning, it was introduced recently (by me) and it's wrong (as I later
discovered).
> which occur periodically
> in the guests log:
More that "periodically" it's randomically. On a kernel compile loop with -jN,
I used to get that more or less once every hour, but with high variability.
Just had no time to proof-check and send all patches I have in my queue.
> Badness in handle_page_fault at arch/um/kernel/trap_kern.c:98
> 0f3d3b30: [<08062f04>] handle_page_fault+0x1c4/0x260
> 0f3d3b70: [<08063047>] segv+0xa7/0x2e0
> 0f3d3b90: [<080ba701>] sys_read+0x51/0x80
> 0f3d3bd0: [<08053680>] init_udf_fs+0x30/0x50
> 0f3d3c00: [<08053680>] init_udf_fs+0x30/0x50
> 0f3d3c20: [<08053680>] init_udf_fs+0x30/0x50
> 0f3d3c40: [<08065291>] get_skas_faultinfo+0x51/0xc0
> 0f3d3c60: [<08065358>] handle_segv+0x58/0x60
> 0f3d3c80: [<08065a1d>] userspace+0x1ed/0x220
> 0f3d3cd0: [<08066d94>] force_flush_all_skas+0x44/0x50
> 0f3d3cf0: [<08066621>] fork_handler+0xc1/0xe0
It's an error message I introduced to detect a possible bug; however, I later
discovered that under high load this warning can be triggered without a real
problem.
The problem would be a "100% CPU usage" loop (a process endlessly causing
guest page faults) right after the warning, so if you haven't got the problem
the warning is a false positive.
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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prev parent reply other threads:[~2005-11-10 11:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-10 6:43 [uml-devel] errors in uml-guest log Sven Köhler
2005-11-10 11:38 ` Blaisorblade [this message]
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