WARNING in blk_throtl_bio[drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] Initialized vkms 1.0.0 20180514 for vkms on minor 1
usbcore: registered new interface driver udl
WARNING: CPU: 0 PID: 1 at block/blk-throttle.c:2128 blk_throtl_bio+0x19f4/0x29f0 block/blk-throttle.c:2128
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.20.0-rc5-next-20181206+ #162
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x632 kernel/panic.c:214
 __warn.cold.8+0x20/0x4f kernel/panic.c:571
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:blk_throtl_bio+0x19f4/0x29f0 block/blk-throttle.c:2128
Code: 8b 1d f0 68 d7 05 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 0e 0e 00 00 49 89 9c 24 00 01 00 00 e9 46 f6 ff ff e8 6c cc f6 fd <0f> 0b e9 78 e7 ff ff 31 db e9 ed eb ff ff e8 59 cc f6 fd 0f 0b e8
RSP: 0000:ffff8881d9a5e228 EFLAGS: 00010293
RAX: ffff8881d9a50040 RBX: ffff8881d1fe0000 RCX: ffffffff83890eaa
RDX: 0000000000000000 RSI: ffffffff83892734 RDI: 0000000000000005
RBP: ffff8881d9a5e438 R08: ffff8881d9a50040 R09: ffffed103b585b5f
R10: ffffed103b585b5f R11: ffff8881dac2dafb R12: ffff8881d1830c88
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881d1fc0170
 blkcg_bio_issue_check include/linux/blk-cgroup.h:778 [inline]
 generic_make_request_checks+0x84c/0x2150 block/blk-core.c:1014
 generic_make_request+0x2c7/0x1890 block/blk-core.c:1084
 submit_bio+0xba/0x460 block/blk-core.c:1249
 submit_bh_wbc+0x5fa/0x7f0 fs/buffer.c:3118
 submit_bh fs/buffer.c:3124 [inline]
 block_read_full_page+0xc5c/0xf80 fs/buffer.c:2329
 blkdev_readpage+0x1c/0x20 fs/block_dev.c:598
 do_read_cache_page+0x850/0x17b0 mm/filemap.c:2775
 read_cache_page+0x5b/0x70 mm/filemap.c:2863
 read_mapping_page include/linux/pagemap.h:402 [inline]
 read_dev_sector+0x120/0x4f0 block/partition-generic.c:664
 read_part_sector block/partitions/check.h:38 [inline]
 adfspart_check_ICS+0x18b/0x1080 block/partitions/acorn.c:366
 check_partition+0x3c3/0x6f0 block/partitions/check.c:167
 rescan_partitions+0x16c/0x8e0 block/partition-generic.c:528
 __blkdev_get+0xb7b/0x13b0 fs/block_dev.c:1536
 blkdev_get+0xc1/0xb50 fs/block_dev.c:1643
 register_disk block/genhd.c:629 [inline]
 __device_add_disk+0x1006/0x13d0 block/genhd.c:708
 device_add_disk+0x2a/0x40 block/genhd.c:726
 add_disk include/linux/genhd.h:409 [inline]
 brd_init+0x2da/0x3ee drivers/block/brd.c:512
 do_one_initcall+0x145/0x957 init/main.c:892
 do_initcall_level init/main.c:960 [inline]
 do_initcalls init/main.c:968 [inline]
 do_basic_setup init/main.c:986 [inline]
 kernel_init_freeable+0x5cc/0x6ba init/main.c:1139
 kernel_init+0x11/0x1ae init/main.c:1059
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..