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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1206837

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: raring

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https://bugs.launchpad.net/bugs/1206837

Title:
  Ubuntu Raring Kernel - pull patch block/partitions: optimize memory
  allocation in check_partition

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  We have a Ubuntu Raring server running kernel 3.8.13-030813-generic

  We use iscsi to consume LUNs out of a storage array in the backend.
  When the server is loaded we run into the issue of iSCSI device
  discovery failing to scan partitions on LUNs with

  Jul 30 12:12:01 srv1 kernel: [101661.119322] kworker/u:20: page allocation failure: order:4, mode:0x10c0d0
  Jul 30 12:12:01 srv1 kernel: [101661.119327] Pid: 32539, comm: kworker/u:20 Tainted: GF       W  O 3.8.13-030813-generic #201305111843
  Jul 30 12:12:01 srv1 kernel: [101661.119329] Call Trace:
  Jul 30 12:12:01 srv1 kernel: [101661.119340]  [<ffffffff8113ac96>] warn_alloc_failed+0xf6/0x150
  Jul 30 12:12:01 srv1 kernel: [101661.119345]  [<ffffffff8113e156>] ? drain_local_pages+0x16/0x20
  Jul 30 12:12:01 srv1 kernel: [101661.119350]  [<ffffffff810bc8e0>] ? on_each_cpu_mask+0x50/0x70
  Jul 30 12:12:01 srv1 kernel: [101661.119354]  [<ffffffff8113e8ce>] __alloc_pages_nodemask+0x76e/0x9b0
  Jul 30 12:12:01 srv1 kernel: [101661.119359]  [<ffffffff8117af3a>] alloc_pages_current+0xba/0x170
  Jul 30 12:12:01 srv1 kernel: [101661.119363]  [<ffffffff81139aae>] __get_free_pages+0xe/0x40
  Jul 30 12:12:01 srv1 kernel: [101661.119367]  [<ffffffff8118427f>] kmalloc_order_trace+0x3f/0xd0
  Jul 30 12:12:01 srv1 kernel: [101661.119373]  [<ffffffff8133af30>] check_partition+0x30/0x200
  Jul 30 12:12:01 srv1 kernel: [101661.119376]  [<ffffffff8133ac58>] rescan_partitions+0xb8/0x2b0
  Jul 30 12:12:01 srv1 kernel: [101661.119381]  [<ffffffff811d52cb>] __blkdev_get+0x39b/0x480
  Jul 30 12:12:01 srv1 kernel: [101661.119386]  [<ffffffff8107f7eb>] ? bit_waitqueue+0x1b/0xc0
  Jul 30 12:12:01 srv1 kernel: [101661.119389]  [<ffffffff811d540e>] blkdev_get+0x5e/0x1e0
  Jul 30 12:12:01 srv1 kernel: [101661.119393]  [<ffffffff81337a82>] register_disk+0x172/0x190
  Jul 30 12:12:01 srv1 kernel: [101661.119396]  [<ffffffff81338334>] add_disk+0xb4/0x230
  Jul 30 12:12:01 srv1 kernel: [101661.119403]  [<ffffffff814bba76>] sd_probe_async+0x126/0x220
  Jul 30 12:12:01 srv1 kernel: [101661.119407]  [<ffffffff8108704f>] async_run_entry_fn+0xaf/0x1d0
  Jul 30 12:12:01 srv1 kernel: [101661.119410]  [<ffffffff81078b81>] process_one_work+0x141/0x490
  Jul 30 12:12:01 srv1 kernel: [101661.119413]  [<ffffffff81079b48>] worker_thread+0x168/0x400
  Jul 30 12:12:01 srv1 kernel: [101661.119416]  [<ffffffff810799e0>] ? manage_workers+0x120/0x120
  Jul 30 12:12:01 srv1 kernel: [101661.119419]  [<ffffffff8107f050>] kthread+0xc0/0xd0
  Jul 30 12:12:01 srv1 kernel: [101661.119423]  [<ffffffff8107ef90>] ? flush_kthread_worker+0xb0/0xb0
  Jul 30 12:12:01 srv1 kernel: [101661.119429]  [<ffffffff816f61ec>] ret_from_fork+0x7c/0xb0
  Jul 30 12:12:01 srv1 kernel: [101661.119432]  [<ffffffff8107ef90>] ? flush_kthread_worker+0xb0/0xb0

  We see this issue is fixed in 3.9 kernels with the following commit

  https://github.com/torvalds/linux/commit/ac2e5327a5e4f6477afc6a3b3b0dc6e0476d71d4

  Kindly request you to pull this patch into Ubuntu raring stable 3.8 kernel version as detailed in 
  http://lwn.net/Articles/550581/

  Thank You

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