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[Xen-devel] kernel BUG at block/bio.c:1786 -- (xen_blkif_schedule on the stack)



I get the BUG below in dom0 when trying to start a windows 10 domu (hvm,
with some pv-drivers installed ) . Below is "xl info", then comes dmesg
output, and finally domu config attached at end.

This domain is started very rarely, so may have been broken for some
time. All my other domains ar linux. This message is just a data-point
for whoever is interested, with possibly more data if anybody wants to
ask me anything. NOT expecting quick resolution of this :-/ .

The domain boots part of the way, screen resolution gets changed and
then it keeps spinning for ~ 5 seconds before stopping.

-----
# xl info
host                   : gentoo
release                : 4.9.8-gentoo
version                : #1 SMP Sun Feb 5 04:25:10 CET 2017
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 23
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 2394
hw_caps                :
b7ebfbff:77fef3ff:2c100800:00000021:00000001:000037ab:00000000:00000100
virt_caps              : hvm hvm_directio
total_memory           : 65376
free_memory            : 20811
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 8
xen_extra              : .0
xen_version            : 4.8.0
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : ssd-xen-noidle-autogen-marker
console_timestamps=date loglvl=warn/warn guest_loglvl=warn/warn
iommu=1,verbose,debug iommu_inclusive_mapping=1 com1=115200,8n1
com2=115200,8n1 console=com2 dom0_max_vcpus=4 dom0_vcpus_pin=1
dom0_mem=7G,max:7G cpufreq=xen,performance,verbose
sched_smt_power_savings=1 apic_verbosity=debug e820-verbose=1
core_parking=power cpuidle=0 nmi=dom0 tmem=1 tmem_compress=0 tmem_dedup=0
cc_compiler            : x86_64-pc-linux-gnu-gcc (Gentoo 5.4.0 p1.0,
pie-0.6.5) 5.4.0
cc_compile_by          :
cc_compile_domain      : alstadheim.priv.no
cc_compile_date        : Thu Dec 22 01:53:23 CET 2016
build_id               : 14ea86d056798436b26a27b06046797e
xend_config_format     : 4

----------
[339809.663061] br0: port 12(vif7.0) entered blocking state
[339809.663063] br0: port 12(vif7.0) entered disabled state
[339809.663123] device vif7.0 entered promiscuous mode
[339809.664885] IPv6: ADDRCONF(NETDEV_UP): vif7.0: link is not ready
[339809.742522] br0: port 13(vif7.0-emu) entered blocking state
[339809.742523] br0: port 13(vif7.0-emu) entered disabled state
[339809.742573] device vif7.0-emu entered promiscuous mode
[339809.744386] br0: port 13(vif7.0-emu) entered blocking state
[339809.744388] br0: port 13(vif7.0-emu) entered forwarding state
[339864.059095] xen-blkback: backend/vbd/7/768: prepare for reconnect
[339864.138002] xen-blkback: backend/vbd/7/768: using 1 queues, protocol
1 (x86_64-abi)
[339864.241039] xen-blkback: backend/vbd/7/832: prepare for reconnect
[339864.337997] xen-blkback: backend/vbd/7/832: using 1 queues, protocol
1 (x86_64-abi)
[339875.245306] vif vif-7-0 vif7.0: Guest Rx ready
[339875.245345] IPv6: ADDRCONF(NETDEV_CHANGE): vif7.0: link becomes ready
[339875.245391] br0: port 12(vif7.0) entered blocking state
[339875.245395] br0: port 12(vif7.0) entered forwarding state
[339894.122151] ------------[ cut here ]------------
[339894.122169] kernel BUG at block/bio.c:1786!
[339894.122173] invalid opcode: 0000 [#1] SMP
[339894.122176] Modules linked in: xt_physdev iptable_filter ip_tables
x_tables nfsd auth_rpcgss oid_registry nfsv4 dns_resolver nfsv3 nfs_acl
binfmt_misc intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp
crc32c_intel pcspkr serio_raw i2c_i801 i2c_smbus iTCO_wdt
iTCO_vendor_support amdgpu drm_kms_helper syscopyarea bcache input_leds
sysfillrect sysimgblt fb_sys_fops ttm drm uas shpchp ipmi_ssif rtc_cmos
acpi_power_meter wmi tun snd_hda_codec_realtek snd_hda_codec_generic
snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd
usbip_host usbip_core pktcdvd tmem lpc_ich xen_wdt nct6775 hwmon_vid
dm_zero dm_thin_pool dm_persistent_data dm_bio_prison dm_service_time
dm_round_robin dm_queue_length dm_multipath dm_log_userspace cn
virtio_pci virtio_scsi virtio_blk virtio_console virtio_balloon
[339894.122233]  xts gf128mul aes_x86_64 cbc sha512_generic
sha256_generic sha1_generic libiscsi scsi_transport_iscsi virtio_net
virtio_ring virtio tg3 libphy e1000 fuse overlay nfs lockd grace sunrpc
jfs multipath linear raid10 raid1 raid0 dm_raid raid456
async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq
dm_snapshot dm_bufio dm_crypt dm_mirror dm_region_hash dm_log dm_mod
hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_monterey
hid_microsoft hid_logitech ff_memless hid_gyration hid_ezkey hid_cypress
hid_chicony hid_cherry hid_a4tech sl811_hcd xhci_plat_hcd ohci_pci
ohci_hcd uhci_hcd aic94xx lpfc qla2xxx aacraid sx8 DAC960 hpsa cciss
3w_9xxx 3w_xxxx mptsas mptfc scsi_transport_fc mptspi mptscsih mptbase
atp870u dc395x qla1280 imm parport dmx3191d sym53c8xx gdth initio BusLogic
[339894.122325]  arcmsr aic7xxx aic79xx sg pdc_adma sata_inic162x
sata_mv sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via
sata_svw sata_sil24 sata_sil sata_promise pata_sis usbhid led_class igb
ptp dca i2c_algo_bit ehci_pci ehci_hcd xhci_pci megaraid_sas xhci_hcd
[339894.122350] CPU: 3 PID: 23514 Comm: 7.hda-0 Tainted: G        W
 4.9.8-gentoo #1
[339894.122353] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D8
WS/Z10PE-D8 WS, BIOS 3304 06/22/2016
[339894.122358] task: ffff880244b55b00 task.stack: ffffc90042fcc000
[339894.122361] RIP: e030:[<ffffffff813c6af7>]  [<ffffffff813c6af7>]
bio_split+0x9/0x89
[339894.122370] RSP: e02b:ffffc90042fcfb18  EFLAGS: 00010246
[339894.122373] RAX: 00000000000000a8 RBX: ffff8802433ee900 RCX:
ffff88023f537080
[339894.122377] RDX: 0000000002400000 RSI: 0000000000000000 RDI:
ffff8801fc8b7890
[339894.122380] RBP: ffffc90042fcfba8 R08: 0000000000000000 R09:
00000000000052da
[339894.122383] R10: 0000000000000002 R11: 0005803fffffffff R12:
ffff8801fc8b7890
[339894.122387] R13: 00000000000000a8 R14: ffffc90042fcfbb8 R15:
0000000000000000
[339894.122394] FS:  0000000000000000(0000) GS:ffff8802498c0000(0000)
knlGS:ffff8802498c0000
[339894.122398] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[339894.122401] CR2: 00007f99b78e3349 CR3: 0000000216d43000 CR4:
0000000000042660
[339894.122405] Stack:
[339894.122407]  ffffffff813d1bce 0000000000000002 ffffc90042fcfb50
ffff88023f537080
[339894.122413]  0000000000000002 0000000100000000 0000000000000000
0000000100000000
[339894.122419]  0000000000000000 000000000d2ee022 0000000200006fec
0000000000000000
[339894.122424] Call Trace:
[339894.122429]  [<ffffffff813d1bce>] ? blk_queue_split+0x448/0x48b
[339894.122435]  [<ffffffff813cd7f3>] blk_queue_bio+0x44/0x289
[339894.122439]  [<ffffffff813cc226>] generic_make_request+0xbd/0x160
[339894.122443]  [<ffffffff813cc3c9>] submit_bio+0x100/0x11d
[339894.122446]  [<ffffffff813d2b8a>] ? next_bio+0x1d/0x40
[339894.122450]  [<ffffffff813c4d10>] submit_bio_wait+0x4e/0x62
[339894.122454]  [<ffffffff813d2df3>] blkdev_issue_discard+0x71/0xa9
[339894.122459]  [<ffffffff81534fd4>] __do_block_io_op+0x4f0/0x579
[339894.122463]  [<ffffffff81534fd4>] ? __do_block_io_op+0x4f0/0x579
[339894.122469]  [<ffffffff81770005>] ? sha_transform+0xf47/0x1069
[339894.122474]  [<ffffffff81535544>] xen_blkif_schedule+0x318/0x63c
[339894.122478]  [<ffffffff81777498>] ? __schedule+0x32e/0x4e8
[339894.122484]  [<ffffffff81088f9b>] ? wake_up_atomic_t+0x2c/0x2c
[339894.122488]  [<ffffffff8153522c>] ? xen_blkif_be_int+0x2c/0x2c
[339894.122492]  [<ffffffff810742aa>] kthread+0xa6/0xae
[339894.122496]  [<ffffffff81074204>] ? init_completion+0x24/0x24
[339894.122501]  [<ffffffff8177a335>] ret_from_fork+0x25/0x30
[339894.122504] Code: ff 31 c0 eb 0e 48 89 de 4c 89 e7 e8 81 fd ff ff 4c
89 e0 48 83 c4 18 5b 41 5a 41 5c 41 5d 41 5e 5d c3 0f 1f 44 00 00 85 f6
7f 02 <0f> 0b 55 89 d0 48 89 e5 41 55 41 89 f5 41 54 53 8b 57 28 c1 ea
[339894.122543] RIP  [<ffffffff813c6af7>] bio_split+0x9/0x89
[339894.122547]  RSP <ffffc90042fcfb18>
[339894.132772] ---[ end trace 36cf8d8b83453b4f ]---
[340083.587187] BUG: unable to handle kernel NULL pointer dereference at
          (null)
[340083.587207] IP: [<ffffffff81075f6d>] put_cred+0x0/0x11
[340083.587215] PGD 22e200067
[340083.587217] PUD 22e201067
[340083.587219] PMD 0

[340083.587223] Oops: 0002 [#2] SMP
[340083.587226] Modules linked in: xt_physdev iptable_filter ip_tables
x_tables nfsd auth_rpcgss oid_registry nfsv4 dns_resolver nfsv3 nfs_acl
binfmt_misc intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp
crc32c_intel pcspkr serio_raw i2c_i801 i2c_smbus iTCO_wdt
iTCO_vendor_support amdgpu drm_kms_helper syscopyarea bcache input_leds
sysfillrect sysimgblt fb_sys_fops ttm drm uas shpchp ipmi_ssif rtc_cmos
acpi_power_meter wmi tun snd_hda_codec_realtek snd_hda_codec_generic
snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer snd
usbip_host usbip_core pktcdvd tmem lpc_ich xen_wdt nct6775 hwmon_vid
dm_zero dm_thin_pool dm_persistent_data dm_bio_prison dm_service_time
dm_round_robin dm_queue_length dm_multipath dm_log_userspace cn
virtio_pci virtio_scsi virtio_blk virtio_console virtio_balloon
[340083.587289]  xts gf128mul aes_x86_64 cbc sha512_generic
sha256_generic sha1_generic libiscsi scsi_transport_iscsi virtio_net
virtio_ring virtio tg3 libphy e1000 fuse overlay nfs lockd grace sunrpc
jfs multipath linear raid10 raid1 raid0 dm_raid raid456
async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq
dm_snapshot dm_bufio dm_crypt dm_mirror dm_region_hash dm_log dm_mod
hid_sunplus hid_sony hid_samsung hid_pl hid_petalynx hid_monterey
hid_microsoft hid_logitech ff_memless hid_gyration hid_ezkey hid_cypress
hid_chicony hid_cherry hid_a4tech sl811_hcd xhci_plat_hcd ohci_pci
ohci_hcd uhci_hcd aic94xx lpfc qla2xxx aacraid sx8 DAC960 hpsa cciss
3w_9xxx 3w_xxxx mptsas mptfc scsi_transport_fc mptspi mptscsih mptbase
atp870u dc395x qla1280 imm parport dmx3191d sym53c8xx gdth initio BusLogic
[340083.587391]  arcmsr aic7xxx aic79xx sg pdc_adma sata_inic162x
sata_mv sata_qstor sata_vsc sata_uli sata_sis sata_sx4 sata_nv sata_via
sata_svw sata_sil24 sata_sil sata_promise pata_sis usbhid led_class igb
ptp dca i2c_algo_bit ehci_pci ehci_hcd xhci_pci megaraid_sas xhci_hcd
[340083.587418] CPU: 1 PID: 33 Comm: xenwatch Tainted: G      D W
4.9.8-gentoo #1
[340083.587424] Hardware name: ASUSTeK COMPUTER INC. Z10PE-D8
WS/Z10PE-D8 WS, BIOS 3304 06/22/2016
[340083.587428] task: ffff8802440b8d00 task.stack: ffffc90040174000
[340083.587431] RIP: e030:[<ffffffff81075f6d>]  [<ffffffff81075f6d>]
put_cred+0x0/0x11
[340083.587436] RSP: e02b:ffffc90040177d10  EFLAGS: 00010246
[340083.587439] RAX: 0000000000000000 RBX: ffff880244b55b00 RCX:
0000000000000035
[340083.587443] RDX: 0000000000000036 RSI: 0000000000000008 RDI:
0000000000000000
[340083.587448] RBP: ffffc90040177d20 R08: 0000000000000000 R09:
ffffffff814e38e9
[340083.587452] R10: ffffc900400b7dd0 R11: ffffc90040177c90 R12:
0000000000000000
[340083.587456] R13: 0000000000000000 R14: ffff8802246fc800 R15:
ffff880218255600
[340083.587465] FS:  0000000000000000(0000) GS:ffff880249840000(0000)
knlGS:ffff880249840000
[340083.587469] CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[340083.587472] CR2: 0000000000000000 CR3: 00000002291a2000 CR4:
0000000000042660
[340083.587476] Stack:
[340083.587478]  ffffffff81076203 ffff880244b55b00 ffffc90040177d38
ffffffff810587c0
[340083.587485]  ffff880244b55b00 ffffc90040177d58 ffffffff8107488b
ffff8802125d4d20
[340083.587492]  ffff880214c9d740 ffffc90040177db0 ffffffff81535bfb
ffffc90040177e3c
[340083.587498] Call Trace:
[340083.587504]  [<ffffffff81076203>] ? exit_creds+0x24/0x3e
[340083.587510]  [<ffffffff810587c0>] __put_task_struct+0x6e/0xbd
[340083.587514]  [<ffffffff8107488b>] kthread_stop+0xaa/0xed
[340083.587519]  [<ffffffff81535bfb>] xen_blkif_disconnect+0x54/0x235
[340083.587525]  [<ffffffff8115bbbe>] ? kfree+0xd6/0x10e
[340083.587530]  [<ffffffff8115bbbe>] ? kfree+0xd6/0x10e
[340083.587533]  [<ffffffff8153706a>] frontend_changed+0x3a5/0x4e7
[340083.587538]  [<ffffffff81078173>] ? arch_local_irq_enable+0xb/0xd
[340083.587545]  [<ffffffff814e48c6>] xenbus_otherend_changed+0x84/0x8d
[340083.587549]  [<ffffffff814e3913>] ? xenbus_gather+0x123/0x123
[340083.587553]  [<ffffffff814e552f>] frontend_changed+0x10/0x12
[340083.587557]  [<ffffffff814e39db>] xenwatch_thread+0xc8/0xf3
[340083.587564]  [<ffffffff81088f9b>] ? wake_up_atomic_t+0x2c/0x2c
[340083.587569]  [<ffffffff810742aa>] kthread+0xa6/0xae
[340083.587573]  [<ffffffff81074204>] ? init_completion+0x24/0x24
[340083.587581]  [<ffffffff8177a335>] ret_from_fork+0x25/0x30
[340083.587584] Code: 05 00 00 75 02 0f 0b 48 3b b8 b0 05 00 00 75 02 0f
0b 55 48 81 c7 90 00 00 00 48 c7 c6 80 5e 07 81 48 89 e5 e8 a8 01 03 00
5d c3 <f0> ff 0f 74 01 c3 55 48 89 e5 e8 ac ff ff ff 5d c3 0f 1f 44 00
[340083.587628] RIP  [<ffffffff81075f6d>] put_cred+0x0/0x11
[340083.587634]  RSP <ffffc90040177d10>
[340083.587637] CR2: 0000000000000000
[340083.587640] ---[ end trace 36cf8d8b83453b50 ]---

------------ domu.cfg: (sorry for the line-wraps)---
name = "windows.hvm"
builder = "hvm"
vcpus = 8
pvh=0
memory = 8192
mmio_hole=3072
localtime = 1
no_migrate = 1
nestedhvm = 1
timer_mode = "one_missed_tick_pending"
device_model_version="qemu-xen"
disk = [ 'format=raw, vdev=hda, access=rw,
target=/dev/bcache/by-label/winsys-b'
,'format=raw, vdev=hdb, access=rw, target=/dev/bcache/by-label/windata-b'
,'file:/usr/local/share/xen/cd-images/virtio-win.iso,hdc:cdrom,r'
]
vif = [ 'mac=02:16:3e:00:00:05,model=e1000']
on_poweroff = 'destroy'
on_reboot = 'destroy'
on_crash = 'destroy'
boot = 'cd'
acpi = '1'
viridian = '1'
sdl = '0'
vnc = '0'
videoram=1024
vga="qxl"
spice= '1'
spicehost='0.0.0.0'
spiceport=6000
spicepasswd
spicedisable_ticketing=1
spicevdagent=1
spice_clipboard_sharing=1
client to domUs
spiceusbredirection=4
soundhw="hda"
keymap="en-us"

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