Re: [GIT PULL] Core block IO bits for 2.6.39 - early Oops

Chris Mason
2011-03-25T13:02:58Z

Excerpts from Dave Chinner's message of 2011-03-25 00:41:28 -0400:
> On Thu, Mar 24, 2011 at 08:34:41PM +0100, Markus Trippelsdorf wrote:

[ oopsen and fs corruptions in linus master ]

>
> So the patchset is causing repeatable filesystem corruption? Sounds
> to me like this series is not yet ready for mainline merging. Last
> thing I want to spend the .39 cycle helping people recover busted
> filesystems as a result of undercooked block layer changes...
>

I tried to reproduce this, but didn't get farther than make
modules_install. My setup works like this:

build new kernel
start virtual machine off new kernel
make modules_install over NFS to get new modules (just the filesystems)

make modules_install instantly did this:
BUG: spinlock recursion on CPU#0, as/2014
lock: ffff88006e939d08, .magic: dead4ead, .owner: as/2014, .owner_cpu: 0
Pid: 2014, comm: as Tainted: G W 2.6.38-josef+ #228
Call Trace:
[<ffffffff812712e5>] spin_bug+0x9c/0xa3
[<ffffffff81271333>] do_raw_spin_lock+0x47/0x13c
[<ffffffff81068329>] ? get_parent_ip+0x11/0x41
[<ffffffff815dd796>] _raw_spin_lock+0x23/0x27
[<ffffffff811258f9>] igrab+0x1b/0x48
[<ffffffff811b2249>] nfs_updatepage+0x2ac/0x469
[<ffffffff811a4eff>] nfs_write_end+0x26d/0x298
[<ffffffff81068329>] ? get_parent_ip+0x11/0x41
[<ffffffff810d43b7>] generic_file_buffered_write+0x189/0x26a
[<ffffffff810db611>] ? __alloc_pages_nodemask+0x14d/0x7a8
[<ffffffff810d5b2e>] __generic_file_aio_write+0x32b/0x35b
[<ffffffff810d5bbf>] generic_file_aio_write+0x61/0xba
[<ffffffff811a5ab7>] nfs_file_write+0xde/0x161
[<ffffffff8110f3ba>] do_sync_write+0xcb/0x108
[<ffffffff810f78d4>] ? do_mmap_pgoff+0x29a/0x2f4
[<ffffffff8110f9f7>] vfs_write+0xb5/0x131
[<ffffffff8110fc5c>] sys_write+0x4a/0x71
[<ffffffff815e34ab>] system_call_fastpath+0x16/0x1b

-chris