Failed GFP_ATOMIC allocations (dropped network packets) result in kernel warnings and backtrace

Solution Verified - Updated -


  • Failed GFP_ATOMIC allocations by the network stack result in dropped packets with the following message as seen from the console:
page allocation failure. order:2, mode:0x4020
  • These errors will be followed by a backtrace that shows similar characteristics to the following though the module affected is usually different:
kernel: ksoftirqd/0: page allocation failure. order:1, mode:0x20
kernel: Pid: 4, comm: ksoftirqd/0 Tainted: P           ---------------    2.6.32-358.el6.x86_64 #1
kernel: Call Trace:
kernel: <IRQ>  [<ffffffff8112c127>] ? __alloc_pages_nodemask+0x757/0x8d0
kernel: [<ffffffff811669d2>] ? kmem_getpages+0x62/0x170
kernel: [<ffffffff811675ea>] ? fallback_alloc+0x1ba/0x270
kernel: [<ffffffff8116703f>] ? cache_grow+0x2cf/0x320
kernel: [<ffffffff81167369>] ? ____cache_alloc_node+0x99/0x160
kernel: [<ffffffff81168530>] ? kmem_cache_alloc_node_trace+0x90/0x200
kernel: [<ffffffff8116874d>] ? __kmalloc_node+0x4d/0x60
kernel: [<ffffffff8143d6ad>] ? __alloc_skb+0x6d/0x190
kernel: [<ffffffff8143d7ed>] ? dev_alloc_skb+0x1d/0x40
kernel: [<ffffffffa0d01174>] ? ipoib_alloc_rx_skb+0x44/0x200 [ib_ipoib]
kernel: [<ffffffffa0d013cf>] ? ipoib_ib_handle_rx_wc+0x9f/0x590 [ib_ipoib]
kernel: [<ffffffffa0d01977>] ? ipoib_poll+0xb7/0x160 [ib_ipoib]
kernel: [<ffffffff8144cd43>] ? net_rx_action+0x103/0x2f0
kernel: [<ffffffff81076fb1>] ? __do_softirq+0xc1/0x1e0
kernel: [<ffffffff8100c1cc>] ? call_softirq+0x1c/0x30
kernel: <EOI>  [<ffffffff8100de05>] ? do_softirq+0x65/0xa0


  • Red Hat Enterprise Linux
  • Fast network interface such as 1 Gigabit, 10 Gigabit, 40 Gigabit

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content