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From: Dominik Karall <dominik.karall@gmx.net>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U3
Date: Sat, 16 Oct 2004 22:30:11 +0200
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Cc: linux-kernel@vger.kernel.org, Lee Revell <rlrevell@joe-job.com>,
       Rui Nuno Capela <rncbc@rncbc.org>, Mark_H_Johnson@raytheon.com,
       "K.R. Foley" <kr@cybsft.com>, Daniel Walker <dwalker@mvista.com>,
       Bill Huey <bhuey@lnxw.com>, Andrew Morton <akpm@osdl.org>,
       Adam Heath <doogie@debian.org>,
       Lorenzo Allegrucci <l_allegrucci@yahoo.it>,
       Andrew Rodland <arodland@entermail.net>
References: <OF29AF5CB7.227D041F-ON86256F2A.0062D210@raytheon.com> <200410161621.34657.dominik.karall@gmx.net> <20041016152427.GA16334@elte.hu>
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On Saturday 16 October 2004 17:24, Ingo Molnar wrote:
> * Dominik Karall <dominik.karall@gmx.net> wrote:
> > i'm not sure if this bug depends on preemption patch, or if it is a
> > general one in -mm1 tree.
> >
> > kernel BUG at fs/fat/cache.c:150!
> >
> > EIP is at fat_cache_add+0x135/0x151
> >
> > Process mplayer (pid: 9843, threadinfo=3Dce414000 task=3Dc8128a20)
> >
> > Call Trace:
> >  [<c01a11bb>] fat_get_cluster+0x11f/0x1de
> >  [<c01a12c1>] fat_bmap_cluster+0x47/0x98
> >  [<c01a13f1>] fat_bmap+0xdf/0x101
> >  [<c01a36e8>] fat_get_block+0x30/0x198
> >  [<c0152866>] alloc_buffer_head+0x33/0x52
> >  [<c01501ea>] create_buffers+0x51/0x86
> >  [<c015141c>] block_read_full_page+0x1bd/0x2cc
> >  [<c01a36b8>] fat_get_block+0x0/0x198
> >  [<c0132f0c>] add_to_page_cache+0x58/0x6e
> >  [<c013a0e4>] read_pages+0xbe/0x15e
> >  [<c013a49c>] do_page_cache_readahead+0x120/0x19b
> >  [<c013a606>] page_cache_readahead+0xef/0x1f8
> >  [<c01336ab>] do_generic_mapping_read+0x133/0x54b
> >  [<c013c911>] lru_cache_add+0xd/0x4f
> >  [<c0133d53>] __generic_file_aio_read+0x1a3/0x218
> >  [<c0133ac3>] file_read_actor+0x0/0xed
> >  [<c0133ec5>] generic_file_read+0x9c/0xba
> >  [<c012b84c>] _mutex_lock+0x20/0x36
> >  [<c01244c8>] do_sigaction+0x1dc/0x1f7
> >  [<c012b468>] autoremove_wake_function+0x0/0x43
> >  [<c012b84c>] _mutex_lock+0x20/0x36
> >  [<c0167974>] dnotify_parent+0x35/0x95
> >  [<c014e0a9>] vfs_read+0xcd/0x126
> >  [<c014e36f>] sys_read+0x41/0x6a
> >  [<c0103f7b>] syscall_call+0x7/0xb
>
> indeed this does not seem to be related to the preemption patch. How
> hard is it to reproduce this problem? If it's easy then please try with
> vanilla 2.6.9-rc4-mm1 (and if it breaks too, with 2.6.9-rc4 as well), to
> narrow down where the breakage got introduced.
>
>  Ingo

sorry, i tried to reproduce this bug, but can't. i even don't know _when_ t=
his=20
bug occurred, as i just wanted to take a look in the dmesg output after=20
loading sg module. but it does not depend on sg, as i unloaded it and tried=
=20
again to load.

best regards,
dominik

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