[Bug 1071011] Re: specific device not available in client (passthrough) with high cpu load on host, none in client

[Serge Hallyn]

I hadn't noticed this before:

[  761.143056] ------------[ cut here ]------------
[  761.143064] WARNING: at /build/buildd/linux-3.5.0/kernel/irq/manage.c:436 __enable_irq+0x3b/0xd0()
[  761.143066] Hardware name: To be filled by O.E.M.
[  761.143067] Unbalanced enable for IRQ 41
[  761.143068] Modules linked in: pci_stub vhost_net macvtap macvlan ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc snd_hda_codec_hdmi eeepc_wmi asus_wmi sparse_keymap mxm_wmi kvm_amd kvm ghash_clmulni_intel aesni_intel cryptd aes_x86_64 sp5100_tco microcode snd_hda_codec_realtek edac_core psmouse edac_mce_amd fam15h_power serio_raw k10temp i2c_piix4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd radeon soundcore joydev snd_page_alloc ttm drm_kms_helper drm i2c_algo_bit mac_hid wmi lp parport hid_generic usbhid hid firewire_ohci firewire_core crc_itu_t r8169
[  761.143103] Pid: 4015, comm: kvm Not tainted 3.5.0-17-generic #28-Ubuntu
[  761.143104] Call Trace:
[  761.143109]  [<ffffffff81051c4f>] warn_slowpath_common+0x7f/0xc0
[  761.143112]  [<ffffffff81051d46>] warn_slowpath_fmt+0x46/0x50
[  761.143115]  [<ffffffff8103fa39>] ? default_spin_lock_flags+0x9/0x10
[  761.143117]  [<ffffffff810e050b>] __enable_irq+0x3b/0xd0
[  761.143119]  [<ffffffff810e05e2>] enable_irq+0x42/0x80
[  761.143133]  [<ffffffffa0324d3b>] kvm_vm_ioctl_assigned_device+0xa1b/0xb70 [kvm]
[  761.143135]  [<ffffffff81065f37>] ? __set_task_blocked+0x37/0x80
[  761.143144]  [<ffffffffa033298b>] ? x86_emulate_instruction+0x13b/0x570 [kvm]
[  761.143147]  [<ffffffff81068512>] ? __set_current_blocked+0x52/0x70
[  761.143154]  [<ffffffffa031ff6c>] kvm_vm_ioctl+0x4ec/0x520 [kvm]
[  761.143160]  [<ffffffffa031e568>] ? kvm_vcpu_ioctl+0x118/0x610 [kvm]
[  761.143164]  [<ffffffff8135b90a>] ? pci_read_config+0x24a/0x270
[  761.143167]  [<ffffffff811f436c>] ? read+0x7c/0x1f0
[  761.143169]  [<ffffffff81193909>] do_vfs_ioctl+0x99/0x590
[  761.143172]  [<ffffffff81193e99>] sys_ioctl+0x99/0xa0
[  761.143175]  [<ffffffff81689d29>] system_call_fastpath+0x16/0x1b
[  761.143176] ---[ end trace 6bd5dd1c5df4018d ]---
[  802.129162] br0: port 14(vnet12) entered disabled state

Will mark this as affecting the kernel.

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https://bugs.launchpad.net/bugs/1071011

Title:
  specific device not available in client (passthrough) with high cpu
  load on host, none in client

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