Re: WARNING: at /home/ak/lsrc/git/linux-2.6/fs/fs-writeback.c:356

From: Wu Fengguang
Date: Sat Jun 18 2011 - 13:29:31 EST

Hi Andi,

On Wed, Jun 15, 2011 at 05:05:46PM -0700, Andi Kleen wrote:
> Just got this shortly after booting a fresh Linus kernel on a 16 thread
> system. I had some patches on top, but they were completely unrelated.

I cannot reproduce this warning on v3.0-rc3 as well as linux-next.

This warning message appears after upgrading from an older linus tree
to the current linus tree?

There is only one commit since 2.6.39, which looks pretty unrelated
prototype change:

git log v2.6.39..v3.0-rc3 fs/fs-writeback.c

commit aa38572954ade52
fs: pass exact type of data dirties to ->dirty_inode

Looking further back, there are some locking changes between .38 and
.39, however no one has reported problems with .39.

git shortlog v2.6.38..v2.6.39 fs/fs-writeback.c

Dave Chinner (4):
fs: protect inode->i_state with inode->i_lock
fs: move i_sb_list out from under inode_lock
fs: move i_wb_list out from under inode_lock
fs: pull inode->i_lock up out of writeback_single_inode

Lucas De Marchi (1):
Fix common misspellings


> ------------[ cut here ]------------
> WARNING: at /home/ak/lsrc/git/linux-2.6/fs/fs-writeback.c:356 writeback_single_inode+0x65/0x1b7()
> Modules linked in:
> Pid: 3597, comm: flush-8:0 Not tainted 3.0.0-rc3-00061-g522a899 #164
> Call Trace:
> [<ffffffff81039919>] warn_slowpath_common+0x85/0x9d
> [<ffffffff8103994b>] warn_slowpath_null+0x1a/0x1c
> [<ffffffff810ff887>] writeback_single_inode+0x65/0x1b7
> [<ffffffff810ffbe5>] writeback_sb_inodes+0xba/0x134
> [<ffffffff81100592>] writeback_inodes_wb+0x16f/0x181
> [<ffffffff8110080f>] wb_writeback+0x26b/0x3a7
> [<ffffffff81100a92>] wb_do_writeback+0x147/0x1a0
> [<ffffffff81100b77>] bdi_writeback_thread+0x8c/0x20f
> [<ffffffff81100aeb>] ? wb_do_writeback+0x1a0/0x1a0
> [<ffffffff81100aeb>] ? wb_do_writeback+0x1a0/0x1a0
> [<ffffffff81053f11>] kthread+0x82/0x8a
> [<ffffffff815e78d4>] kernel_thread_helper+0x4/0x10
> [<ffffffff81053e8f>] ? kthread_worker_fn+0x13a/0x13a
> [<ffffffff815e78d0>] ? gs_change+0xb/0xb
> ---[ end trace fc0a60eb73c3e138 ]---
> -Andi
> --
> ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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