[Bug 196685] System becomes unresponsive after intel_iommu kernel error

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=196685

--- Comment #8 from changbin.du@hotmail.com ---
If my code match yours, at least there 2 issues:
First, kvm detected a warnning condition when delivering irq to guest.
Second, the WARN caused a paging request oops when executing the trap handler
of the UD0 instrunction.

[36330.176867] BUG: unable to handle kernel paging request at ffffffffc0633f92
[36330.176888] IP: report_bug+0x94/0x120
[36330.176891] PGD 168c20c067 
[36330.176893] P4D 168c20c067 
[36330.176895] PUD 168c20e067 
[36330.176898] PMD 2008194067 
[36330.176901] PTE 80000020017bc161
[36330.176904] 
[36330.176911] Oops: 0003 [#1] SMP
[36330.176913] Modules linked in: xt_recent xt_nat veth nls_utf8 udf crc_itu_t
rfcomm ipt_MASQUERADE nf_nat_masquerade_ipv4 nf_conntrack_netlink nfnetlink
xfrm_user xfrm_algo iptable_nat nf_nat_ipv4 br_netfilter overlay
vmw_vsock_vmci_transport vsock vmw_vmci bridge stp llc bnep binfmt_misc
nls_iso8859_1 snd_hda_codec_hdmi nvidia_uvm(POE) arc4 intel_rapl
x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek
snd_hda_codec_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc
snd_hda_intel snd_hda_codec btusb btrtl btbcm btintel aesni_intel iwlmvm
bluetooth nvidia_drm(POE) aes_x86_64 nvidia_modeset(POE) snd_hda_core
crypto_simd input_leds usblp snd_hwdep hid_sony glue_helper joydev ff_memless
ecdh_generic cryptd nvidia(POE) mac80211 snd_pcm intel_cstate drm_kms_helper
snd_seq_midi
[36330.176991]  snd_seq_midi_event intel_rapl_perf drm snd_rawmidi iwlwifi
fb_sys_fops mxm_wmi snd_seq syscopyarea sysfillrect sysimgblt snd_seq_device
snd_timer cfg80211 snd mei_me mei lpc_ich soundcore shpchp wmi mac_hid
kvm_intel kvm ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 xt_hl ip6t_rt
nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4
nf_log_common xt_LOG xt_multiport xt_limit xt_tcpudp xt_addrtype
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables
nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat
nf_conntrack_ftp nf_conntrack libcrc32c iptable_filter ip_tables x_tables
parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq dm_mirror dm_region_hash
dm_log vhost_net vhost tap vfio_pci vfio_virqfd irqbypass vfio_iommu_type1 vfio
hid_logitech_hidpp
[36330.177074]  hid_logitech_dj hid_generic usbhid hid uas usb_storage igb
e1000e dca ptp ahci i2c_algo_bit pps_core libahci
[36330.177099] CPU: 13 PID: 8711 Comm: qemu-system-x86 Tainted: P           OE 
 4.12.7-041207-generic #201708160856
[36330.177103] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./X99
Taichi, BIOS P1.10 06/29/2016
[36330.177107] task: ffff94808147c380 task.stack: ffffa46262f7c000
[36330.177114] RIP: 0010:report_bug+0x94/0x120
[36330.177118] RSP: 0018:ffffa46262f7f7a0 EFLAGS: 00010202
[36330.177123] RAX: 0000000000000907 RBX: ffffa46262f7f908 RCX:
ffffffffc0633f88
[36330.177127] RDX: 0000000000000001 RSI: 0000000000001359 RDI:
0000000000000001
[36330.177130] RBP: ffffa46262f7f7c0 R08: ffffa46262f80000 R09:
00000000000003ce
[36330.177134] R10: ffffffff83206a80 R11: fffff803741fea0f R12:
ffffffffc0614073
[36330.177137] R13: ffffffffc0633a98 R14: 0000000000000004 R15:
ffffa46262f7f908
[36330.177153] FS:  00007f5b08c67700(0000) GS:ffff94841f140000(0000)
knlGS:00000000003f2000
[36330.177157] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[36330.177161] CR2: ffffffffc0633f92 CR3: 0000001c883de000 CR4:
00000000003426e0
[36330.177165] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[36330.177168] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[36330.177171] Call Trace:
[36330.177186]  ? vmx_deliver_posted_interrupt+0xe3/0xf0 [kvm_intel]
[36330.177196]  fixup_bug+0x2e/0x50
[36330.177203]  do_trap+0x119/0x150
[36330.177209]  do_error_trap+0x89/0x110
[36330.177218]  ? vmx_deliver_posted_interrupt+0xe3/0xf0 [kvm_intel]
[36330.177224]  ? check_preempt_curr+0x74/0x80
[36330.177229]  ? ttwu_do_wakeup+0x1e/0x140
[36330.177233]  ? ttwu_do_activate+0x77/0x80
[36330.177240]  do_invalid_op+0x20/0x30
[36330.177247]  invalid_op+0x1e/0x30
[36330.177255] RIP: 0010:vmx_deliver_posted_interrupt+0xe3/0xf0 [kvm_intel]
[36330.177259] RSP: 0018:ffffa46262f7f9b0 EFLAGS: 00010202
[36330.177263] RAX: 00000c0000f20003 RBX: ffff948081448000 RCX:
0000000000000000
[36330.177267] RDX: ffff94808814f1e0 RSI: 00000000000000d2 RDI:
ffff948081448000
[36330.177270] RBP: ffffa46262f7f9b8 R08: 0000000000000000 R09:
0000000000000000
[36330.177273] R10: fffff8037400cf10 R11: fffff803741fea0f R12:
00000000000000d2
[36330.177277] R13: ffff94831fcf6700 R14: 0000000000000000 R15:
ffff948081448000
[36330.177326]  __apic_accept_irq+0x25b/0x300 [kvm]
[36330.177351]  kvm_apic_set_irq+0x2a/0x30 [kvm]
[36330.177374]  kvm_irq_delivery_to_apic+0x20b/0x2a0 [kvm]
[36330.177396]  kvm_lapic_reg_write+0x112/0x640 [kvm]
[36330.177417]  kvm_hv_vapic_msr_write+0x34/0x70 [kvm]
[36330.177439]  kvm_hv_set_msr_common+0x303/0x9d0 [kvm]
[36330.177461]  kvm_set_msr_common+0x64c/0xc30 [kvm]
[36330.177484]  ? x86_emulate_insn+0x161/0xdd0 [kvm]
[36330.177491]  vmx_set_msr+0xba/0x7d0 [kvm_intel]
[36330.177510]  kvm_set_msr+0x41/0x70 [kvm]
[36330.177516]  handle_wrmsr+0x59/0x140 [kvm_intel]
[36330.177521]  vmx_handle_exit+0xab/0xb40 [kvm_intel]
[36330.177527]  ? vmx_vcpu_run+0x2d7/0x460 [kvm_intel]
[36330.177547]  vcpu_enter_guest+0x440/0x1120 [kvm]
[36330.177567]  ? x86_emulate_instruction+0x586/0x6e0 [kvm]
[36330.177573]  ? __set_task_blocked+0x3c/0xa0
[36330.177594]  kvm_arch_vcpu_ioctl_run+0x210/0x3f0 [kvm]
[36330.177612]  ? kvm_arch_vcpu_ioctl_run+0x210/0x3f0 [kvm]
[36330.177628]  kvm_vcpu_ioctl+0x2a6/0x620 [kvm]
[36330.177633]  ? do_futex+0x30a/0x510
[36330.177638]  do_vfs_ioctl+0xa5/0x600
[36330.177657]  ? kvm_on_user_return+0x6f/0xa0 [kvm]
[36330.177661]  SyS_ioctl+0x79/0x90
[36330.177665]  entry_SYSCALL_64_fastpath+0x1e/0xa9
[36330.177668] RIP: 0033:0x7f5b27557f07
[36330.177670] RSP: 002b:00007f5b08c66908 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[36330.177674] RAX: ffffffffffffffda RBX: 000000000000ae80 RCX:
00007f5b27557f07
[36330.177676] RDX: 0000000000000000 RSI: 000000000000ae80 RDI:
0000000000000012
[36330.177678] RBP: 0000009fdb7405a0 R08: 0000009fd9118550 R09:
00000000000000ff
[36330.177680] R10: 0000000000000001 R11: 0000000000000246 R12:
0000000000000000
[36330.177682] R13: 00007f5b2c6e3000 R14: 0000000000000000 R15:
0000009fdb7405a0
[36330.177685] Code: 74 59 0f b7 41 0a 4c 63 69 04 0f b7 71 08 89 c7 49 01 cd
83 e7 01 a8 02 74 15 66 85 ff 74 10 a8 04 ba 01 00 00 00 75 26 83 c8 04 <66> 89
41 0a 66 85 ff 74 49 0f b6 49 0b 4c 89 e2 45 31 c9 49 89 
[36330.177735] RIP: report_bug+0x94/0x120 RSP: ffffa46262f7f7a0
[36330.177737] CR2: ffffffffc0633f92
[36330.177740] ---[ end trace 5d67fb9cae2ae6de ]---

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