From: Florian Bruhin <me@the-compiler.org>
To: Liu Bo <bo.li.liu@oracle.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: BTRFS critical / kernel BUG / high load
Date: Mon, 17 Mar 2014 11:59:24 +0100 [thread overview]
Message-ID: <20140317105924.GD21978@lupin> (raw)
In-Reply-To: <20140317104715.GB2447@localhost.localdomain>
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* Liu Bo <bo.li.liu@oracle.com> [2014-03-17 18:47:16 +0800]:
> On Mon, Mar 17, 2014 at 06:57:54AM +0100, Florian Bruhin wrote:
> > Hi,
> >
> > on one of my servers running btrfs, I noticed a very high load of
> > 26/26/26. After investigating further, this happened in my logs about
> > 5 minutes before the monitoring alerted me because of the load:
> >
> > [...]
> >
> > So basically after that happened, my load stayed high, so probably
> > something went berzerk.
>
> I get what makes the load stay high, but still don't know how this BUG_ON was triggered.
>
> Or maybe by 'gdb btrfs.ko and list *btrfs_search_old_slot+0x7c4',
> you can get where it refers to?
I'm not really experienced with debugging kernel code or modules.
That's what I tried:
$ gunzip -c /usr/lib/modules/3.13.6-1-ARCH/kernel/fs/btrfs/btrfs.ko.gz > btrfs.ko
$ gdb btrfs.ko
[...]
Reading symbols from btrfs.ko...(no debugging symbols found)...done.
(gdb) list *btrfs_search_old_slot+0x7c4
No symbol table is loaded. Use the "file" command.
(gdb) file /boot/vmlinuz-linux
Reading symbols from /boot/vmlinuz-linux...(no debugging symbols found)...done.
(gdb) list *btrfs_search_old_slot+0x7c4
No symbol table is loaded. Use the "file" command.
It seems the addresses shown are dependent at load-time anyways? Or
should I recompile the kernel with debugging symbols and try again,
should that work?
Florian
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next prev parent reply other threads:[~2014-03-17 10:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-17 5:57 BTRFS critical / kernel BUG / high load Florian Bruhin
2014-03-17 10:47 ` Liu Bo
2014-03-17 10:59 ` Florian Bruhin [this message]
2014-03-17 11:16 ` Filipe David Manana
2014-03-17 12:47 ` Florian Bruhin
2014-03-17 13:08 ` Filipe David Manana
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