Date:	Wed, 31 Jan 2007 16:24:22 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: 2.6.20-rc6-mm3

On Wed, 31 Jan 2007 16:14:10 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> On Mon, 29 Jan 2007, Andrew Morton wrote:
> 
> > - Restored git-block.patch: mainly the block unplugging rework.  The
> >   problematic CFQ updates have been taken out.
> 
> MD hung again as before so I compiled a kernel 
> without it. Next XFS started hanging during bootup.

ow.  Please don't make me drop git-block-and-lots-of-other-things again.
Was 2.6.20-rc6-mm2 OK?  It didn't have git-block.

> Some traces of processes hung but I do not have a clue as to what is 
> wrong here...:

Probably an IO got lost.

> Call Trace:
>  [<a00000010074c1b0>] schedule+0x1bf0/0x1ec0
>                                 sp=e00000301560fac0 bsp=e000003015608fc8
>  [<a0000001003ba350>] xfs_buf_iorequest+0x130/0x820
>                                 sp=e00000301560fbd0 bsp=e000003015608f58
>  [<a0000001003c5b00>] xfs_bdstrat_cb+0x60/0x100
>                                 sp=e00000301560fc00 bsp=e000003015608f38
>  [<a0000001003b2ba0>] xfs_bwrite+0xe0/0x1e0
>                                 sp=e00000301560fc00 bsp=e000003015608f00
>  [<a0000001003a3980>] xfs_syncsub+0x2c0/0x520
>                                 sp=e00000301560fc00 bsp=e000003015608eb0
>  [<a0000001003a3d30>] xfs_sync+0x70/0xa0
>                                 sp=e00000301560fc00 bsp=e000003015608e88
>  [<a0000001003cb400>] vfs_sync+0xa0/0xc0
>                                 sp=e00000301560fc00 bsp=e000003015608e58
>  [<a0000001003c8910>] xfs_fs_write_super+0x70/0xa0
>                                 sp=e00000301560fc00 bsp=e000003015608e38
>  [<a00000010016d490>] sync_supers+0x150/0x260
>                                 sp=e00000301560fc00 bsp=e000003015608e08
>  [<a000000100115820>] wb_kupdate+0x60/0x280
>                                 sp=e00000301560fc00 bsp=e000003015608dc8
>  [<a000000100116570>] pdflush+0x330/0x4e0
>                                 sp=e00000301560fc50 bsp=e000003015608d90
>  [<a0000001000d2ac0>] kthread+0x220/0x2a0
>                                 sp=e00000301560fd50 bsp=e000003015608d48
>  [<a000000100010a50>] kernel_thread_helper+0xd0/0x100
>                                 sp=e00000301560fe30 bsp=e000003015608d20
>  [<a000000100009140>] start_kernel_thread+0x20/0x40
>                                 sp=e00000301560fe30 bsp=e000003015608d20
>                                                                                              
> Call Trace:
>  [<a00000010074c1b0>] schedule+0x1bf0/0x1ec0
>                                 sp=e00001b03869f8b0 bsp=e00001b038699618
>  [<a00000010074db00>] schedule_timeout+0x40/0x180
>                                 sp=e00001b03869f9c0 bsp=e00001b0386995e0
>  [<a000000100385420>] _xfs_log_force+0x500/0x5c0
>                                 sp=e00001b03869f9f0 bsp=e00001b038699580
>  [<a00000010030ccf0>] xfs_alloc_search_busy+0x190/0x1e0
>                                 sp=e00001b03869fa20 bsp=e00001b038699538
>  [<a000000100311010>] xfs_alloc_ag_vextent+0x2250/0x2420
>                                 sp=e00001b03869fa20 bsp=e00001b0386994a8
>  [<a000000100312490>] xfs_alloc_vextent+0x690/0x9c0
>                                 sp=e00001b03869fa60 bsp=e00001b038699428
>  [<a000000100332540>] xfs_bmapi+0x1e00/0x33a0
>                                 sp=e00001b03869fa60 bsp=e00001b0386992d8
>  [<a00000010037e750>] xfs_iomap_write_allocate+0x3f0/0x760
>                                 sp=e00001b03869fba0 bsp=e00001b038699248
>  [<a00000010037d650>] xfs_iomap+0x670/0xb00
>                                 sp=e00001b03869fc30 bsp=e00001b0386991d0
>  [<a0000001003c5a80>] xfs_bmap+0x40/0x60
>                                 sp=e00001b03869fc80 bsp=e00001b038699188
>  [<a0000001003b5b40>] xfs_map_blocks+0xa0/0x120
>                                 sp=e00001b03869fc80 bsp=e00001b038699148
>  [<a0000001003b6260>] xfs_page_state_convert+0x540/0x1a40
>                                 sp=e00001b03869fc90 bsp=e00001b038699080
>  [<a0000001003b7e20>] xfs_vm_writepage+0x180/0x220
>                                 sp=e00001b03869fd50 bsp=e00001b038699040
>  [<a0000001001146e0>] generic_writepages+0x420/0x800
>                                 sp=e00001b03869fd60 bsp=e00001b038698fc0
>  [<a0000001003b7f50>] xfs_vm_writepages+0x90/0xc0
>                                 sp=e00001b03869fdf0 bsp=e00001b038698f88
>  [<a000000100114b70>] do_writepages+0xb0/0x120
>                                 sp=e00001b03869fdf0 bsp=e00001b038698f58
>  [<a000000100108470>] __filemap_fdatawrite_range+0xb0/0xe0
>                                 sp=e00001b03869fdf0 bsp=e00001b038698f20
>  [<a0000001001089c0>] filemap_fdatawrite+0x40/0x60
>                                 sp=e00001b03869fe30 bsp=e00001b038698f00
>  [<a0000001003befe0>] fs_flush_pages+0xc0/0x100
>                                 sp=e00001b03869fe30 bsp=e00001b038698eb8
>  [<a0000001003adaf0>] xfs_close+0x190/0x1e0
>                                 sp=e00001b03869fe30 bsp=e00001b038698e80
>  [<a0000001003be4e0>] xfs_file_close+0xa0/0xc0
>                                 sp=e00001b03869fe30 bsp=e00001b038698e60
>  [<a0000001001643b0>] filp_close+0xd0/0x140
>                                 sp=e00001b03869fe30 bsp=e00001b038698e30
>  [<a000000100164560>] sys_close+0x140/0x1e0
>                                 sp=e00001b03869fe30 bsp=e00001b038698db0
>  [<a00000010000b360>] ia64_ret_from_syscall+0x0/0x20
>                                 sp=e00001b03869fe30 bsp=e00001b038698db0
>  [<a000000000010620>] __kernel_syscall_via_break+0x0/0x20
>                                 sp=e00001b0386a0000 bsp=e00001b038698db0
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