Re: writeback hang in current mainline

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On Wed, May 26, 2010 at 01:21:25PM +0200, Jens Axboe wrote:
> Not good, can you see if reverting 7c8a3554 makes it go away?

Reverting back to the revision before 7c8a3554 gives me lots of warnings ala:

[  178.253431] ------------[ cut here ]------------
[  178.256845] WARNING: at
/home/hch/work/linux-2.6/fs/fs-writeback.c:596
writeback_inodes_wb+0x423/0x440()
[  178.259995] Hardware name: Bochs
[  178.261270] Modules linked in:
[  178.262508] Pid: 2298, comm: flush-253:16 Tainted: G        W
2.6.34-rc5 #121
[  178.265199] Call Trace:
[  178.266210]  [<c08d86ca>] ? printk+0x18/0x1a
[  178.267597]  [<c0162d0d>] warn_slowpath_common+0x6d/0xa0
[  178.269296]  [<c0216ff3>] ? writeback_inodes_wb+0x423/0x440
[  178.271348]  [<c0216ff3>] ? writeback_inodes_wb+0x423/0x440
[  178.273121]  [<c0162d55>] warn_slowpath_null+0x15/0x20
[  178.274681]  [<c0216ff3>] writeback_inodes_wb+0x423/0x440
[  178.276390]  [<c0217111>] wb_writeback+0x101/0x1b0
[  178.277846]  [<c01a9a79>] ? __call_rcu+0x99/0x130
[  178.279287]  [<c01a9b38>] ? call_rcu+0x8/0x10
[  178.281110]  [<c02161fa>] ? wb_clear_pending+0x7a/0xa0
[  178.282673]  [<c021728f>] wb_do_writeback+0xcf/0x1a0
[  178.284239]  [<c02171e0>] ? wb_do_writeback+0x20/0x1a0
[  178.285823]  [<c021738a>] bdi_writeback_task+0x2a/0x90
[  178.287371]  [<c01dca90>] ? bdi_start_fn+0x0/0xb0
[  178.288992]  [<c01dcae8>] bdi_start_fn+0x58/0xb0
[  178.290823]  [<c01dca90>] ? bdi_start_fn+0x0/0xb0
[  178.292378]  [<c017dc7c>] kthread+0x6c/0x80
[  178.293711]  [<c017dc10>] ? kthread+0x0/0x80
[  178.295073]  [<c013023a>] kernel_thread_helper+0x6/0x1c
[  178.296753] ---[ end trace a7919e7f17c0a80f ]---
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