https://bugzilla.kernel.org/show_bug.cgi?id=60505
Bug ID: 60505
Summary: Heavy network traffic triggers vhost_net lockup
Product: Virtualization
Version: unspecified
Kernel Version: 3.9.8
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
Assignee: [email protected]
Reporter: [email protected]
Regression: No
When running heavy network traffic between host and guests after some time the
qemu-kvm processes lock up and become unkillable. Apparently these processes
hang in an ioctl. From the output of echo w > /proc/sysrq-trigger:
SysRq : Show Blocked State
task PC stack pid father
qemu-kvm D ffff88011fa128c0 0 30506 1 0x00000004
ffff88005dc11d38 0000000000000086 ffff880097c20720 ffff88005dc11fd8
ffff88005dc11fd8 ffff88005dc11fd8 ffffffff81810440 ffff880097c20720
ffff88005dc11d48 ffff88005ddb0058 ffff88005ddb8528 ffff88005ddb0000
Call Trace:
[<ffffffff813fa679>] schedule+0x29/0x70
[<ffffffffa07a39a5>] vhost_work_flush+0xa5/0x120 [vhost_net]
[<ffffffffa07a3b19>] vhost_poll_flush+0x19/0x20 [vhost_net]
[<ffffffffa07a6077>] vhost_net_flush_vq+0x37/0x50 [vhost_net]
[<ffffffffa07a71d2>] vhost_net_ioctl+0x502/0x660 [vhost_net]
[<ffffffff8114bed0>] do_vfs_ioctl+0x90/0x520
[<ffffffff8114c3b0>] sys_ioctl+0x50/0x90
[<ffffffff81403a42>] system_call_fastpath+0x16/0x1b
qemu-kvm D ffff88011fad28c0 0 30575 1 0x00000004
ffff880097e05d38 0000000000000082 ffff8800a3c50000 ffff880097e05fd8
ffff880097e05fd8 ffff880097e05fd8 ffff88011acd5ca0 ffff8800a3c50000
ffff880097e05d48 ffff8800d41c0058 ffff8800d41c8528 ffff8800d41c0000
Call Trace:
[<ffffffff813fa679>] schedule+0x29/0x70
[<ffffffffa07a39a5>] vhost_work_flush+0xa5/0x120 [vhost_net]
[<ffffffffa07a3b19>] vhost_poll_flush+0x19/0x20 [vhost_net]
[<ffffffffa07a6077>] vhost_net_flush_vq+0x37/0x50 [vhost_net]
[<ffffffffa07a71d2>] vhost_net_ioctl+0x502/0x660 [vhost_net]
[<ffffffff8114bed0>] do_vfs_ioctl+0x90/0x520
[<ffffffff8114c3b0>] sys_ioctl+0x50/0x90
[<ffffffff81403a42>] system_call_fastpath+0x16/0x1b
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