Public bug reported:

Build environment: Tangerine build server with dchroot disco-amd64
Build command: fakeroot debian/rules do_tools=0 no_dumpfile=1 clean 
binary-generic binary-headers

While building the test kernel for Disco, the kernel built from master-next 
branch (head: e903d6a UBUNTU: upstream stable to v4.19.83, v5.3.10) will result 
in the following error on boot with an AMD64 KVM node:
[    2.724234] [TTM] Initializing pool allocator
[    2.725770] [TTM] Initializing DMA pool allocator
[    2.727918] [drm] fb mappable at 0xFC000000
[    2.729462] [drm] vram aper at 0xFC000000
[    2.729980] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000020
[    2.730902] [drm] size 33554432
[    2.735026] #PF error: [normal kernel read fault]
[    2.735028] PGD 0 P4D 0
[    2.735032] Oops: 0000 [#1] SMP PTI
[    2.735036] CPU: 1 PID: 211 Comm: systemd-udevd Not tainted 5.0.0-37-generic 
#40
[    2.736230] [drm] fb depth is 16
[    2.738490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
[    2.739526] [drm]    pitch is 2048
[    2.740751] RIP: 0010:attempt_merge+0x145/0x9d0
[    2.740753] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
[    2.740754] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
[    2.753490] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input4
[    2.758417] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 0000000000000000
[    2.758418] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    2.758418] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 0000000000000004
[    2.758419] R10: 0000000000000001 R11: 0000000000000800 R12: ffff9a1b33260000
[    2.758420] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 0000000000000000
[    2.758421] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
[    2.758422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.758423] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 00000000000006e0
[    2.758426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.786182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    2.786183] Call Trace:
[    2.786188]  ? insert_work+0x6c/0x80
[    2.786193]  ? __sbitmap_get_word+0x31/0x90
[    2.786194]  blk_attempt_req_merge+0xe/0x30
[    2.786198]  elv_attempt_insert_merge+0x35/0x90
[    2.786201]  blk_mq_sched_try_insert_merge+0x42/0x50
[    2.786203]  dd_insert_requests+0x90/0x1c0
[    2.786206]  blk_mq_sched_insert_request+0x12d/0x1a0
[    2.786208]  blk_mq_make_request+0x36c/0x4d0
[    2.786210]  generic_make_request+0x19e/0x400
[    2.786212]  submit_bio+0x49/0x140
[    2.786215]  ? guard_bio_eod+0x32/0x100
[    2.786217]  submit_bh_wbc+0x185/0x1b0
[    2.786219]  block_read_full_page+0x24d/0x330
[    2.786222]  ? check_disk_change+0x70/0x70
[    2.786225]  ? count_shadow_nodes+0x140/0x140
[    2.786228]  blkdev_readpage+0x18/0x20
[    2.786232]  do_read_cache_page+0x374/0x7a0
[    2.786234]  ? blkdev_writepages+0x10/0x10
[    2.786237]  ? get_page_from_freelist+0xefe/0x1440
[    2.786240]  ? __radix_tree_replace+0x59/0xf0
[    2.786243]  read_cache_page+0x12/0x20
[    2.786244]  read_dev_sector+0x2d/0xd0
[    2.786246]  read_lba+0xcd/0x220
[    2.786248]  efi_partition+0x1e4/0x6de
[    2.786250]  ? vsnprintf+0x103/0x520
[    2.786252]  ? snprintf+0x49/0x60
[    2.786253]  ? is_gpt_valid.part.7+0x470/0x470
[    2.786255]  check_partition+0x13e/0x238
[    2.786256]  rescan_partitions+0xaf/0x2a0
[    2.786259]  ? _cond_resched+0x19/0x30
[    2.786260]  __blkdev_get+0x393/0x550
[    2.786262]  blkdev_get+0x10c/0x330
[    2.786264]  ? wake_up_bit+0x42/0x50
[    2.786267]  ? unlock_new_inode+0x53/0x70
[    2.786269]  ? bdget+0x111/0x130
[    2.786270]  __device_add_disk+0x321/0x480
[    2.786272]  device_add_disk+0x13/0x20
[    2.786275]  virtblk_probe+0x4ef/0x79f [virtio_blk]
[    2.786278]  virtio_dev_probe+0x172/0x230
[    2.786282]  really_probe+0xfe/0x3b0
[    2.786284]  driver_probe_device+0xba/0x100
[    2.786286]  __driver_attach+0xf1/0x120
[    2.786288]  ? driver_probe_device+0x100/0x100
[    2.786290]  bus_for_each_dev+0x79/0xc0
[    2.786292]  ? kmem_cache_alloc_trace+0x1bd/0x1d0
[    2.786294]  driver_attach+0x1e/0x20
[    2.786295]  bus_add_driver+0x159/0x230
[    2.786297]  ? 0xffffffffc0410000
[    2.786299]  driver_register+0x70/0xc0
[    2.786300]  ? 0xffffffffc0410000
[    2.786302]  register_virtio_driver+0x20/0x30
[    2.786304]  init+0x56/0x1000 [virtio_blk]
[    2.786308]  do_one_initcall+0x4a/0x1c4
[    2.786310]  ? _cond_resched+0x19/0x30
[    2.786311]  ? kmem_cache_alloc_trace+0x167/0x1d0
[    2.786314]  do_init_module+0x60/0x220
[    2.786316]  load_module+0x1797/0x1a00
[    2.786319]  __do_sys_finit_module+0xbd/0x120
[    2.786321]  ? __do_sys_finit_module+0xbd/0x120
[    2.786323]  __x64_sys_finit_module+0x1a/0x20
[    2.786325]  do_syscall_64+0x5a/0x110
[    2.786329]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[    2.786330] RIP: 0033:0x7fd50d7012e9
[    2.786332] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 
f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 
f0 ff ff 73 01 c3 48 8b 0d 77 cb 0c 00 f7 d8 64 89 01 48
[    2.786332] RSP: 002b:00007fff6dd12248 EFLAGS: 00000246 ORIG_RAX: 
0000000000000139
[    2.786334] RAX: ffffffffffffffda RBX: 000055b98c946aa0 RCX: 00007fd50d7012e9
[    2.786335] RDX: 0000000000000000 RSI: 00007fd50d5e2cad RDI: 0000000000000005
[    2.786335] RBP: 00007fd50d5e2cad R08: 0000000000000000 R09: 000055b98c926ab0
[    2.786336] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
[    2.786337] R13: 000055b98c934800 R14: 0000000000020000 R15: 000055b98c946aa0
[    2.786338] Modules linked in: psmouse cirrus(+) ttm virtio_blk(+) 
drm_kms_helper virtio_net(+) syscopyarea sysfillrect net_failover sysimgblt 
failover fb_sys_fops drm floppy i2c_piix4 pata_acpi
[    2.786345] CR2: 0000000000000020
[    2.786379] ---[ end trace 1c7dd9ecceb0cff9 ]---
[    2.786382] RIP: 0010:attempt_merge+0x145/0x9d0
[    2.786383] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
[    2.786384] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
[    2.786385] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 0000000000000000
[    2.786386] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[    2.786386] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 0000000000000004
[    2.786387] R10: 0000000000000001 R11: 0000000000000800 R12: ffff9a1b33260000
[    2.786388] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 0000000000000000
[    2.786389] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
[    2.786390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.786391] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 00000000000006e0
[    2.786394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    2.786395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    2.786728] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input3
[    2.787939] fbcon: cirrusdrmfb (fb0) is primary device
[    2.802935] Console: switching to colour frame buffer device 128x48
[    2.969597] virtio_net virtio1 ens4: renamed from eth0
[    3.078798] cirrus 0000:00:02.0: fb0: cirrusdrmfb frame buffer device

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Disco)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
       Status: New

** Description changed:

+ Build environment: Tangerine build server with dchroot disco-amd64
+ Build command: fakeroot debian/rules do_tools=0 no_dumpfile=1 clean 
binary-generic binary-headers
+ 
  While building the test kernel for Disco, the kernel built from master-next 
branch (head: e903d6a UBUNTU: upstream stable to v4.19.83, v5.3.10) will result 
in the following error on boot with an AMD64 KVM node:
  [    2.724234] [TTM] Initializing pool allocator
  [    2.725770] [TTM] Initializing DMA pool allocator
  [    2.727918] [drm] fb mappable at 0xFC000000
  [    2.729462] [drm] vram aper at 0xFC000000
  [    2.729980] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000020
  [    2.730902] [drm] size 33554432
  [    2.735026] #PF error: [normal kernel read fault]
- [    2.735028] PGD 0 P4D 0 
+ [    2.735028] PGD 0 P4D 0
  [    2.735032] Oops: 0000 [#1] SMP PTI
  [    2.735036] CPU: 1 PID: 211 Comm: systemd-udevd Not tainted 
5.0.0-37-generic #40
  [    2.736230] [drm] fb depth is 16
  [    2.738490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
  [    2.739526] [drm]    pitch is 2048
  [    2.740751] RIP: 0010:attempt_merge+0x145/0x9d0
  [    2.740753] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
  [    2.740754] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
  [    2.753490] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input4
  [    2.758417] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 
0000000000000000
  [    2.758418] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
  [    2.758418] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 
0000000000000004
  [    2.758419] R10: 0000000000000001 R11: 0000000000000800 R12: 
ffff9a1b33260000
  [    2.758420] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 
0000000000000000
  [    2.758421] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
  [    2.758422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    2.758423] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 
00000000000006e0
  [    2.758426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [    2.786182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [    2.786183] Call Trace:
  [    2.786188]  ? insert_work+0x6c/0x80
  [    2.786193]  ? __sbitmap_get_word+0x31/0x90
  [    2.786194]  blk_attempt_req_merge+0xe/0x30
  [    2.786198]  elv_attempt_insert_merge+0x35/0x90
  [    2.786201]  blk_mq_sched_try_insert_merge+0x42/0x50
  [    2.786203]  dd_insert_requests+0x90/0x1c0
  [    2.786206]  blk_mq_sched_insert_request+0x12d/0x1a0
  [    2.786208]  blk_mq_make_request+0x36c/0x4d0
  [    2.786210]  generic_make_request+0x19e/0x400
  [    2.786212]  submit_bio+0x49/0x140
  [    2.786215]  ? guard_bio_eod+0x32/0x100
  [    2.786217]  submit_bh_wbc+0x185/0x1b0
  [    2.786219]  block_read_full_page+0x24d/0x330
  [    2.786222]  ? check_disk_change+0x70/0x70
  [    2.786225]  ? count_shadow_nodes+0x140/0x140
  [    2.786228]  blkdev_readpage+0x18/0x20
  [    2.786232]  do_read_cache_page+0x374/0x7a0
  [    2.786234]  ? blkdev_writepages+0x10/0x10
  [    2.786237]  ? get_page_from_freelist+0xefe/0x1440
  [    2.786240]  ? __radix_tree_replace+0x59/0xf0
  [    2.786243]  read_cache_page+0x12/0x20
  [    2.786244]  read_dev_sector+0x2d/0xd0
  [    2.786246]  read_lba+0xcd/0x220
  [    2.786248]  efi_partition+0x1e4/0x6de
  [    2.786250]  ? vsnprintf+0x103/0x520
  [    2.786252]  ? snprintf+0x49/0x60
  [    2.786253]  ? is_gpt_valid.part.7+0x470/0x470
  [    2.786255]  check_partition+0x13e/0x238
  [    2.786256]  rescan_partitions+0xaf/0x2a0
  [    2.786259]  ? _cond_resched+0x19/0x30
  [    2.786260]  __blkdev_get+0x393/0x550
  [    2.786262]  blkdev_get+0x10c/0x330
  [    2.786264]  ? wake_up_bit+0x42/0x50
  [    2.786267]  ? unlock_new_inode+0x53/0x70
  [    2.786269]  ? bdget+0x111/0x130
  [    2.786270]  __device_add_disk+0x321/0x480
  [    2.786272]  device_add_disk+0x13/0x20
  [    2.786275]  virtblk_probe+0x4ef/0x79f [virtio_blk]
  [    2.786278]  virtio_dev_probe+0x172/0x230
  [    2.786282]  really_probe+0xfe/0x3b0
  [    2.786284]  driver_probe_device+0xba/0x100
  [    2.786286]  __driver_attach+0xf1/0x120
  [    2.786288]  ? driver_probe_device+0x100/0x100
  [    2.786290]  bus_for_each_dev+0x79/0xc0
  [    2.786292]  ? kmem_cache_alloc_trace+0x1bd/0x1d0
  [    2.786294]  driver_attach+0x1e/0x20
  [    2.786295]  bus_add_driver+0x159/0x230
  [    2.786297]  ? 0xffffffffc0410000
  [    2.786299]  driver_register+0x70/0xc0
  [    2.786300]  ? 0xffffffffc0410000
  [    2.786302]  register_virtio_driver+0x20/0x30
  [    2.786304]  init+0x56/0x1000 [virtio_blk]
  [    2.786308]  do_one_initcall+0x4a/0x1c4
  [    2.786310]  ? _cond_resched+0x19/0x30
  [    2.786311]  ? kmem_cache_alloc_trace+0x167/0x1d0
  [    2.786314]  do_init_module+0x60/0x220
  [    2.786316]  load_module+0x1797/0x1a00
  [    2.786319]  __do_sys_finit_module+0xbd/0x120
  [    2.786321]  ? __do_sys_finit_module+0xbd/0x120
  [    2.786323]  __x64_sys_finit_module+0x1a/0x20
  [    2.786325]  do_syscall_64+0x5a/0x110
  [    2.786329]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [    2.786330] RIP: 0033:0x7fd50d7012e9
  [    2.786332] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 
f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 
f0 ff ff 73 01 c3 48 8b 0d 77 cb 0c 00 f7 d8 64 89 01 48
  [    2.786332] RSP: 002b:00007fff6dd12248 EFLAGS: 00000246 ORIG_RAX: 
0000000000000139
  [    2.786334] RAX: ffffffffffffffda RBX: 000055b98c946aa0 RCX: 
00007fd50d7012e9
  [    2.786335] RDX: 0000000000000000 RSI: 00007fd50d5e2cad RDI: 
0000000000000005
  [    2.786335] RBP: 00007fd50d5e2cad R08: 0000000000000000 R09: 
000055b98c926ab0
  [    2.786336] R10: 0000000000000005 R11: 0000000000000246 R12: 
0000000000000000
  [    2.786337] R13: 000055b98c934800 R14: 0000000000020000 R15: 
000055b98c946aa0
  [    2.786338] Modules linked in: psmouse cirrus(+) ttm virtio_blk(+) 
drm_kms_helper virtio_net(+) syscopyarea sysfillrect net_failover sysimgblt 
failover fb_sys_fops drm floppy i2c_piix4 pata_acpi
  [    2.786345] CR2: 0000000000000020
  [    2.786379] ---[ end trace 1c7dd9ecceb0cff9 ]---
  [    2.786382] RIP: 0010:attempt_merge+0x145/0x9d0
  [    2.786383] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
  [    2.786384] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
  [    2.786385] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 
0000000000000000
  [    2.786386] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
  [    2.786386] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 
0000000000000004
  [    2.786387] R10: 0000000000000001 R11: 0000000000000800 R12: 
ffff9a1b33260000
  [    2.786388] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 
0000000000000000
  [    2.786389] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
  [    2.786390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    2.786391] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 
00000000000006e0
  [    2.786394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [    2.786395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [    2.786728] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input3
  [    2.787939] fbcon: cirrusdrmfb (fb0) is primary device
  [    2.802935] Console: switching to colour frame buffer device 128x48
  [    2.969597] virtio_net virtio1 ens4: renamed from eth0
  [    3.078798] cirrus 0000:00:02.0: fb0: cirrusdrmfb frame buffer device

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https://bugs.launchpad.net/bugs/1853981

Title:
  [Regression] Failed to boot disco kernel built from master-next
  (kernel kernel NULL pointer dereference)

Status in linux package in Ubuntu:
  New
Status in linux source package in Disco:
  New

Bug description:
  Build environment: Tangerine build server with dchroot disco-amd64
  Build command: fakeroot debian/rules do_tools=0 no_dumpfile=1 clean 
binary-generic binary-headers

  While building the test kernel for Disco, the kernel built from master-next 
branch (head: e903d6a UBUNTU: upstream stable to v4.19.83, v5.3.10) will result 
in the following error on boot with an AMD64 KVM node:
  [    2.724234] [TTM] Initializing pool allocator
  [    2.725770] [TTM] Initializing DMA pool allocator
  [    2.727918] [drm] fb mappable at 0xFC000000
  [    2.729462] [drm] vram aper at 0xFC000000
  [    2.729980] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000020
  [    2.730902] [drm] size 33554432
  [    2.735026] #PF error: [normal kernel read fault]
  [    2.735028] PGD 0 P4D 0
  [    2.735032] Oops: 0000 [#1] SMP PTI
  [    2.735036] CPU: 1 PID: 211 Comm: systemd-udevd Not tainted 
5.0.0-37-generic #40
  [    2.736230] [drm] fb depth is 16
  [    2.738490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.10.2-1ubuntu1 04/01/2014
  [    2.739526] [drm]    pitch is 2048
  [    2.740751] RIP: 0010:attempt_merge+0x145/0x9d0
  [    2.740753] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
  [    2.740754] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
  [    2.753490] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input4
  [    2.758417] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 
0000000000000000
  [    2.758418] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
  [    2.758418] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 
0000000000000004
  [    2.758419] R10: 0000000000000001 R11: 0000000000000800 R12: 
ffff9a1b33260000
  [    2.758420] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 
0000000000000000
  [    2.758421] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
  [    2.758422] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    2.758423] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 
00000000000006e0
  [    2.758426] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [    2.786182] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [    2.786183] Call Trace:
  [    2.786188]  ? insert_work+0x6c/0x80
  [    2.786193]  ? __sbitmap_get_word+0x31/0x90
  [    2.786194]  blk_attempt_req_merge+0xe/0x30
  [    2.786198]  elv_attempt_insert_merge+0x35/0x90
  [    2.786201]  blk_mq_sched_try_insert_merge+0x42/0x50
  [    2.786203]  dd_insert_requests+0x90/0x1c0
  [    2.786206]  blk_mq_sched_insert_request+0x12d/0x1a0
  [    2.786208]  blk_mq_make_request+0x36c/0x4d0
  [    2.786210]  generic_make_request+0x19e/0x400
  [    2.786212]  submit_bio+0x49/0x140
  [    2.786215]  ? guard_bio_eod+0x32/0x100
  [    2.786217]  submit_bh_wbc+0x185/0x1b0
  [    2.786219]  block_read_full_page+0x24d/0x330
  [    2.786222]  ? check_disk_change+0x70/0x70
  [    2.786225]  ? count_shadow_nodes+0x140/0x140
  [    2.786228]  blkdev_readpage+0x18/0x20
  [    2.786232]  do_read_cache_page+0x374/0x7a0
  [    2.786234]  ? blkdev_writepages+0x10/0x10
  [    2.786237]  ? get_page_from_freelist+0xefe/0x1440
  [    2.786240]  ? __radix_tree_replace+0x59/0xf0
  [    2.786243]  read_cache_page+0x12/0x20
  [    2.786244]  read_dev_sector+0x2d/0xd0
  [    2.786246]  read_lba+0xcd/0x220
  [    2.786248]  efi_partition+0x1e4/0x6de
  [    2.786250]  ? vsnprintf+0x103/0x520
  [    2.786252]  ? snprintf+0x49/0x60
  [    2.786253]  ? is_gpt_valid.part.7+0x470/0x470
  [    2.786255]  check_partition+0x13e/0x238
  [    2.786256]  rescan_partitions+0xaf/0x2a0
  [    2.786259]  ? _cond_resched+0x19/0x30
  [    2.786260]  __blkdev_get+0x393/0x550
  [    2.786262]  blkdev_get+0x10c/0x330
  [    2.786264]  ? wake_up_bit+0x42/0x50
  [    2.786267]  ? unlock_new_inode+0x53/0x70
  [    2.786269]  ? bdget+0x111/0x130
  [    2.786270]  __device_add_disk+0x321/0x480
  [    2.786272]  device_add_disk+0x13/0x20
  [    2.786275]  virtblk_probe+0x4ef/0x79f [virtio_blk]
  [    2.786278]  virtio_dev_probe+0x172/0x230
  [    2.786282]  really_probe+0xfe/0x3b0
  [    2.786284]  driver_probe_device+0xba/0x100
  [    2.786286]  __driver_attach+0xf1/0x120
  [    2.786288]  ? driver_probe_device+0x100/0x100
  [    2.786290]  bus_for_each_dev+0x79/0xc0
  [    2.786292]  ? kmem_cache_alloc_trace+0x1bd/0x1d0
  [    2.786294]  driver_attach+0x1e/0x20
  [    2.786295]  bus_add_driver+0x159/0x230
  [    2.786297]  ? 0xffffffffc0410000
  [    2.786299]  driver_register+0x70/0xc0
  [    2.786300]  ? 0xffffffffc0410000
  [    2.786302]  register_virtio_driver+0x20/0x30
  [    2.786304]  init+0x56/0x1000 [virtio_blk]
  [    2.786308]  do_one_initcall+0x4a/0x1c4
  [    2.786310]  ? _cond_resched+0x19/0x30
  [    2.786311]  ? kmem_cache_alloc_trace+0x167/0x1d0
  [    2.786314]  do_init_module+0x60/0x220
  [    2.786316]  load_module+0x1797/0x1a00
  [    2.786319]  __do_sys_finit_module+0xbd/0x120
  [    2.786321]  ? __do_sys_finit_module+0xbd/0x120
  [    2.786323]  __x64_sys_finit_module+0x1a/0x20
  [    2.786325]  do_syscall_64+0x5a/0x110
  [    2.786329]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [    2.786330] RIP: 0033:0x7fd50d7012e9
  [    2.786332] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 
f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 
f0 ff ff 73 01 c3 48 8b 0d 77 cb 0c 00 f7 d8 64 89 01 48
  [    2.786332] RSP: 002b:00007fff6dd12248 EFLAGS: 00000246 ORIG_RAX: 
0000000000000139
  [    2.786334] RAX: ffffffffffffffda RBX: 000055b98c946aa0 RCX: 
00007fd50d7012e9
  [    2.786335] RDX: 0000000000000000 RSI: 00007fd50d5e2cad RDI: 
0000000000000005
  [    2.786335] RBP: 00007fd50d5e2cad R08: 0000000000000000 R09: 
000055b98c926ab0
  [    2.786336] R10: 0000000000000005 R11: 0000000000000246 R12: 
0000000000000000
  [    2.786337] R13: 000055b98c934800 R14: 0000000000020000 R15: 
000055b98c946aa0
  [    2.786338] Modules linked in: psmouse cirrus(+) ttm virtio_blk(+) 
drm_kms_helper virtio_net(+) syscopyarea sysfillrect net_failover sysimgblt 
failover fb_sys_fops drm floppy i2c_piix4 pata_acpi
  [    2.786345] CR2: 0000000000000020
  [    2.786379] ---[ end trace 1c7dd9ecceb0cff9 ]---
  [    2.786382] RIP: 0010:attempt_merge+0x145/0x9d0
  [    2.786383] Code: 84 a2 02 00 00 41 8b 7c 24 24 4d 8b 44 24 30 c1 ef 09 89 
f8 4c 01 c0 48 3b 43 30 0f 85 0e ff ff ff 48 8b 53 38 4d 8b 7c 24 40 <8b> 42 20 
45 8b 5f 24 89 44 24 3c 4d 85 ff 74 20 41 8b 47 30 85 c0
  [    2.786384] RSP: 0018:ffffb4964067f2f8 EFLAGS: 00010246
  [    2.786385] RAX: 0000000000000000 RBX: ffff9a1b33261200 RCX: 
0000000000000000
  [    2.786386] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000000000
  [    2.786386] RBP: ffffb4964067f378 R08: 0000000000000000 R09: 
0000000000000004
  [    2.786387] R10: 0000000000000001 R11: 0000000000000800 R12: 
ffff9a1b33260000
  [    2.786388] R13: ffff9a1b330c7070 R14: ffff9a1b330c7070 R15: 
0000000000000000
  [    2.786389] FS:  00007fd50d4748c0(0000) GS:ffff9a1b7db00000(0000) 
knlGS:0000000000000000
  [    2.786390] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    2.786391] CR2: 0000000000000020 CR3: 000000003377e000 CR4: 
00000000000006e0
  [    2.786394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [    2.786395] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [    2.786728] input: VirtualPS/2 VMware VMMouse as 
/devices/platform/i8042/serio1/input/input3
  [    2.787939] fbcon: cirrusdrmfb (fb0) is primary device
  [    2.802935] Console: switching to colour frame buffer device 128x48
  [    2.969597] virtio_net virtio1 ens4: renamed from eth0
  [    3.078798] cirrus 0000:00:02.0: fb0: cirrusdrmfb frame buffer device

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