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Message-Id: <1194633853.7078.109.camel@localhost>
Date: Fri, 09 Nov 2007 10:44:13 -0800
From: Dave Hansen <haveblue@...ibm.com>
To: Erez Zadok <ezk@...sunysb.edu>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: OOPSes + WARNING: at fs/file_table.c:262 __fput() in -mm
2007-11-06-02-32++
On Fri, 2007-11-09 at 13:23 -0500, Erez Zadok wrote:
>
> Setup: FC6 system with MM snapshot broken-out-2007-11-06-02-32 and
> these two
> patches added:
>
> r-o-bind-mounts-track-number-of-mount-writer-fix-buggy-loop.patch
> r-o-bind-mounts-track-number-of-mount-writer-fix-buggy-loop-checkpatch-fixes.patch
>
> All I do is boot the system with said kernel, wait a few seconds,
> then shut
> it down with "init 0". As services shutdown, I get this:
>
> Stopping RPC idmapd:
>
> kernel: __fput() of writeable file with no mnt_want_write()
> kernel: WARNING: at fs/file_table.c:262 __fput()
> kernel: [<c010283e>] show_trace_log_lvl+0x12/0x25
> kernel: [<c0103042>] show_trace+0xd/0x10
> kernel: [<c010313e>] dump_stack+0x15/0x17
> kernel: [<c01491a4>] __fput+0x153/0x203
> kernel: [<c014952d>] fput+0x2d/0x32
> kernel: [<c0146c8a>] filp_close+0x50/0x5a
> kernel: [<c01104fc>] put_files_struct+0x7c/0xbe
> kernel: [<c0110575>] __exit_files+0x37/0x3c
> kernel: [<c01115de>] do_exit+0x1ed/0x653
> kernel: [<c0111ab2>] sys_exit_group+0x0/0x11
> kernel: [<c01183fc>] get_signal_to_deliver+0x3c4/0x3e8
> kernel: [<c0101873>] do_notify_resume+0x8c/0x6c4
> kernel: [<c0102339>] work_notifysig+0x13/0x1a
This looks like RPC idmapd had a file open for write when it tried to
exit. However, that file never had a mnt_want_write() taken for it.
This isn't a new bug, but the new debugging code found it much faster.
I'm looking for a fix now.
-- Dave
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