------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 22250 at block/blk-core.c:800 bio_check_ro block/blk-core.c:797 [inline]
WARNING: CPU: 1 PID: 22250 at block/blk-core.c:800 generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 22250 Comm: syz-executor.4 Not tainted 5.4.0-rc7+ #0
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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x20e/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0xd7/0x440 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:bio_check_ro block/blk-core.c:797 [inline]
RIP: 0010:generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Code: 3c 05 00 00 4c 89 f8 48 c1 e8 03 8a 04 08 84 c0 0f 85 17 14 00 00 41 8b 17 48 c7 c7 73 98 40 88 4c 89 f6 31 c0 e8 cd 5c 14 fe <0f> 0b e9 35 fc ff ff e8 41 c6 41 fe c6 05 f6 55 89 05 01 48 c7 c7
RSP: 0018:ffff888054e471b0 EFLAGS: 00010246
RAX: 49af074cf05ee700 RBX: 0000000000000001 RCX: ffff888053ee2680
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffff888054e47270 R08: ffffffff815cc0b4 R09: ffffed1015d66120
R10: ffffed1015d66120 R11: 0000000000000000 R12: ffff8880a1211988
R13: 1ffff11014242331 R14: ffff888054e47210 R15: ffff8880a2e6553c
 generic_make_request+0x33/0x980 block/blk-core.c:1018
 submit_bio+0x26b/0x540 block/blk-core.c:1190
 submit_bh_wbc+0x619/0x700 fs/buffer.c:3095
 __block_write_full_page+0x943/0x1070 fs/buffer.c:1767
 block_write_full_page+0x1a4/0x220 include/linux/highmem.h:102
 blkdev_writepage+0x24/0x30 fs/block_dev.c:609
 __writepage+0x63/0xd0 mm/page-writeback.c:2303
 write_cache_pages+0x94a/0xe70 mm/page-writeback.c:2238
 generic_writepages+0x93/0xd0 mm/page-writeback.c:2329
 blkdev_writepages+0x1d/0x30 fs/block_dev.c:2031
 do_writepages+0xfb/0x1f0 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x2c2/0x360 mm/filemap.c:421
 __filemap_fdatawrite mm/filemap.c:429 [inline]
 filemap_fdatawrite mm/filemap.c:434 [inline]
 filemap_write_and_wait+0xca/0x160 mm/filemap.c:640
 __sync_blockdev fs/block_dev.c:491 [inline]
 sync_blockdev fs/block_dev.c:500 [inline]
 __blkdev_put+0x1a2/0x6d0 fs/block_dev.c:1860
 blkdev_put+0x2c8/0x3b0 fs/block_dev.c:1929
 blkdev_close+0x7b/0xa0 fs/block_dev.c:1936
 __fput+0x2e4/0x740 fs/file_table.c:280
 ____fput+0x15/0x20 fs/file_table.c:313
 task_work_run+0x17e/0x1b0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x5e8/0x2190 kernel/exit.c:817
 do_group_exit+0x15c/0x2b0 kernel/exit.c:921
 get_signal+0x4ac/0x1d60 kernel/signal.c:2734
 do_signal+0x37/0x640 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline]
 prepare_exit_to_usermode+0x303/0x580 arch/x86/entry/common.c:194
 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274
 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc222f4538 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 000000000045a639
RDX: 0000000000000000 RSI: 0000000000000081 RDI: 000000000075bf28
RBP: 000000000075bf2c R08: 00000000007612c0 R09: ffffffffffffffff
R10: 00007ffc222f4600 R11: 0000000000000246 R12: 000000000075bf20
R13: 0000000000000003 R14: 0000000000000000 R15: 000000000075bf2c
Kernel Offset: disabled
Rebooting in 86400 seconds..