Re: [Xen-devel] Linux 3.1 domU + ext3 = WARNING: at fs/ext3/inode.c

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Oct 25, 2011 at 03:48:00PM -0400, Christopher S. Aker wrote:
> Either right on boot, or shortly thereafter, the following occurs
> with either writeback or ordered filesystems.  Multiple reports, all
> different machines, different users...  Some people had success
> after I changed CONFIG_EXT3_DEFAULTS_TO_ORDERED off, however some
> still had problems...  That was my only config change from 3.0.4.
> Them rebooting back into 3.0.4 fixed it.

Oh, so this is 3.1 DomU kernel? And your Dom0 is 2.6.18?

What does the guest show for the disk? As in, is the barrier feature
enabled? 

.. snip
> ------------[ cut here ]------------
> WARNING: at fs/ext3/inode.c:1695 ext3_writeback_writepage+0x12a/0x150()
> Modules linked in:
> Pid: 2146, comm: flush-202:0 Not tainted 3.1.0-linode39 #1
> Call Trace:
>  [<c01346f8>] ? warn_slowpath_common+0x78/0xb0
>  [<c025643a>] ? ext3_writeback_writepage+0x12a/0x150
>  [<c025643a>] ? ext3_writeback_writepage+0x12a/0x150
>  [<c013474b>] ? warn_slowpath_null+0x1b/0x20
>  [<c025643a>] ? ext3_writeback_writepage+0x12a/0x150
>  [<c01067e4>] ? check_events+0x8/0xc
>  [<c018c3c8>] ? __writepage+0x8/0x30
>  [<c018cbc6>] ? write_cache_pages+0x196/0x390
>  [<c018c3c0>] ? set_page_dirty+0x60/0x60
>  [<c010dfd8>] ? sched_clock+0x8/0x10
>  [<c0154452>] ? sched_clock_local+0xb2/0x190
>  [<c018cdfe>] ? generic_writepages+0x3e/0x60
>  [<c01d4ae5>] ? writeback_single_inode+0x115/0x2b0
>  [<c0102b18>] ? xen_end_context_switch+0x8/0x10
>  [<c01d52c1>] ? writeback_sb_inodes+0x171/0x210
>  [<c01d58d5>] ? __writeback_inodes_wb+0x75/0xb0
>  [<c01d5b31>] ? wb_writeback+0x1a1/0x1b0
>  [<c0106007>] ? xen_force_evtchn_callback+0x17/0x30
>  [<c01067e4>] ? check_events+0x8/0xc
>  [<c01d5cef>] ? wb_do_writeback+0x1af/0x1c0
>  [<c01d5d71>] ? bdi_writeback_thread+0x71/0x130
>  [<c01d5d00>] ? wb_do_writeback+0x1c0/0x1c0
>  [<c014e1a4>] ? kthread+0x74/0x80
>  [<c014e130>] ? kthread_worker_fn+0x170/0x170
>  [<c06c63b6>] ? kernel_thread_helper+0x6/0x10
> ---[ end trace 0a37bc36a180e73c ]---
> 
> Am I barking up the wrong list?

Not sure.. It depends on what your dom0 version is and what
the backend is? blktap or blkback?

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