** Also affects: linux (Ubuntu Trusty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Trusty)
Status: New => Fix Committed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1616193
Title:
3.13: libvirtd: page allocation failure: order:4, mode:0x1040d0
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Trusty:
Fix Committed
Bug description:
[Impact]
* libvirtd is no longer able to open the vhost_net device. This causes the
guest VM to hang. This happens if memory becomes fragmented to the point where
vhost_net_open is not able to successfully kmalloc.
* Gratuitous stack trace.
libvirtd: page allocation failure: order:4, mode:0x1040d0
CPU: 14 PID: 82768 Comm: libvirtd Not tainted 3.13.0-85-generic #129-Ubuntu
Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 1.5.4 10/002/2015
0000000000000000 ffff88003b419990 ffffffff8172b6a7 00000000001040d0
0000000000000000 ffff88003b419a18 ffffffff811580eb ffff88187fffce48
ffff88003b4199b8 ffffffff8115abd6 ffff88003b4199e8 0000000000000286
Call Trace:
[<ffffffff8172b6a7>] dump_stack+0x64/0x82
[<ffffffff811580eb>] warn_alloc_failed+0xeb/0x140
[<ffffffff8115abd6>] ? drain_local_pages+0x16/0x20
[<ffffffff8115c8c0>] __alloc_pages_nodemask+0x980/0xb90
[<ffffffff8119b3a3>] alloc_pages_current+0xa3/0x160
[<ffffffff811570ae>] __get_free_pages+0xe/0x50
[<ffffffff811743be>] kmalloc_order_trace+0x2e/0xc0
[<ffffffffa04e79c9>] vhost_net_open+0x29/0x1b0 [vhost_net]
[<ffffffff81484283>] misc_open+0xb3/0x170
[<ffffffff811c63ff>] chrdev_open+0x9f/0x1d0
[<ffffffff811bef13>] do_dentry_open+0x233/0x2e0
[<ffffffff811c6360>] ? cdev_put+0x30/0x30
[<ffffffff811bf249>] vfs_open+0x49/0x50
[<ffffffff811d0812>] do_last+0x562/0x1370
[<ffffffff811d16db>] path_openat+0xbb/0x670
[<ffffffff811d2afa>] do_filp_open+0x3a/0x90
[<ffffffff811df957>] ? __alloc_fd+0xa7/0x130
[<ffffffff811c0d69>] do_sys_open+0x129/0x2a0
[<ffffffff811c0efe>] SyS_open+0x1e/0x20
[<ffffffff8173c39d>] system_call_fastpath+0x1a/0x1f
* justification: because cloud.
* The patches fix this issue by allowing vhost_net_open to use
vmalloc when kmalloc fails to find a sufficient page size.
[Test Case]
* Fragment Kernel memory. Write to Nic from within a kvm guest that
uses a virtio nic.
[Regression Potential]
* Fix was implemented upstream in 3.15, and still exists.
* The fix is fairly straightfoward given the stack trace and the
upstream fix.
* The fix is hard to verify, as it requires significant memory
fragmentation, and an over-active guest. The users machine that was
experiencing this has worked around this by removing VM's from the
compute host, and using vfs.cache.pressure=600.
[Other Info]
* https://lkml.org/lkml/2013/1/23/492
*
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=23cc5a991c7a9fb7e6d6550e65cee4f4173111c5
*
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d04257b07f2362d4eb550952d5bf5f4241a8046d
* I'm going on vacation, and Eric Desrochers will be following up on this in
my absence. This is also the reason for submitting before receiving
verification.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1616193/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
