Re: Oops while booting 2.6.34-rc0 (block pull busted)

[Jens Axboe <jens.axboe@oracle.com>]

On Tue, Mar 02 2010, Jens Axboe wrote:
> On Mon, Mar 01 2010, Dmitry Torokhov wrote:
> > Hi,
> > 
> > It looks like block tree that has been pulled today into mainline is
> > busted, I am getting the Opps below on boot with the following commit:
> > 
> > commit b1bf9368407ae7e89d8a005bb40beb70a41df539
> > Merge: 524df55 4671a13
> > Author: Linus Torvalds <torvalds@linux-foundation.org>
> > Date:   Mon Mar 1 09:00:29 2010 -0800
> > 
> >     Merge branch 'for-2.6.34' of git://git.kernel.dk/linux-2.6-block
> >  
> > 
> > but not with the previous one:
> > 
> > commit 524df55725217b13d5a232fb5badb5846418ea0e
> > Merge: 0f45339 6679ee1
> > Author: Linus Torvalds <torvalds@linux-foundation.org>
> > Date:   Mon Mar 1 08:58:44 2010 -0800
> > 
> >     Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
> > 
> > This is on plain Fedora 12 VM.
> > 
> > Thanks.
> > 
> > -- 
> > Dmitry
> > 
> > sd 2:0:0:0: Attached scsi generic sg1 type 0
> > sd 2:0:0:0: [sda] 16777216 512-byte logical blocks: (8.58 GB/8.00 GiB)
> > sd 2:0:0:0: [sda] Write Protect is off
> > sd 2:0:0:0: [sda] Cache data unavailable
> > sd 2:0:0:0: [sda] Assuming drive cache: write through
> > sd 2:0:0:0: [sda] Cache data unavailable
> > sd 2:0:0:0: [sda] Assuming drive cache: write through
> >  sda: sda1 sda2
> > sd 2:0:0:0: [sda] Cache data unavailable
> > sd 2:0:0:0: [sda] Assuming drive cache: write through
> > sd 2:0:0:0: [sda] Attached SCSI disk
> > device-mapper: multipath: version 1.1.1 loaded
> > dracut: Scanning devices sda2  for LVM volume groups 
> > dracut: Reading all physical volumes. This may take a while...
> > dracut: Found volume group "VolGroup" using metadata type lvm2
> > dracut: 2 logical volume(s) in volume group "VolGroup" now active
> > EXT4-fs (dm-0): mounted filesystem with ordered data mode
> > BUG: unable to handle kernel NULL pointer dereference at (null)
> > IP: [<ffffffff81128ee1>] mpage_end_io_read+0x45/0x6f
> > PGD 3b776067 PUD 3b7b1067 PMD 0 
> > Oops: 0002 [#1] SMP 
> > last sysfs file: /sys/kernel/uevent_seqnum
> > CPU 0 
> > Modules linked in: dm_multipath mptspi mptscsih mptbase scsi_transport_spi floppy [last unloaded: scsi_wait_scan]
> > 
> > Pid: 1, comm: init Not tainted 2.6.33 #4 440BX Desktop Reference Platform/VMware Virtual Platform
> > RIP: 0010:[<ffffffff81128ee1>]  [<ffffffff81128ee1>] mpage_end_io_read+0x45/0x6f
> 
> Can you check where that is? Just do a gdb vmlinux and then an
> l *mpage_end_io_read+0x45

I tried checking mine here, but we must be using vastly different gcc
versions. So I'd like that output. Can you also try and see if reverting
9f7cdbc33f36d28e57eaba0093f68f0d14c38c5b makes it work?

-- 
Jens Axboe