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: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: bvanassche@xxxxxxx 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 -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
