------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 7376 at block/blk-core.c:704 bio_check_ro block/blk-core.c:704 [inline]
WARNING: CPU: 1 PID: 7376 at block/blk-core.c:704 submit_bio_checks+0x7de/0x1680 block/blk-core.c:817
Modules linked in:
CPU: 0 PID: 7376 Comm: syz-executor.3 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bio_check_ro block/blk-core.c:704 [inline]
RIP: 0010:submit_bio_checks+0x7de/0x1680 block/blk-core.c:817
Code: b6 90 e0 05 00 00 48 8d 74 24 58 4c 89 ff 89 54 24 08 e8 b5 75 fe ff 8b 54 24 08 48 c7 c7 20 a1 10 88 48 89 c6 e8 1f 75 fe 03 <0f> 0b e9 22 fb ff ff 48 b8 00 00 00 00 00 fc ff df 48 8b 14 24 48
RSP: 0018:ffffc90004877170 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 1ffff9200090ee35 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff88127f80 RDI: fffff5200090ee20
RBP: ffff88810cddb068 R08: 0000000000000001 R09: ffff8881f65310e7
R10: ffffed103eca621c R11: 7420676e69797254 R12: ffff888110f0fe90
R13: ffff88810cddb574 R14: ffff88810c8b1000 R15: ffff888110f0fe80
FS:  0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000119752005 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x79/0xdb0 block/blk-core.c:1032
 submit_bio+0xdf/0x4b0 block/blk-core.c:1118
 submit_bh_wbc+0x4e9/0x6a0 fs/buffer.c:3055
 __block_write_full_page+0x614/0xdd0 fs/buffer.c:1810
 __writepage+0x58/0x140 mm/page-writeback.c:2311
 write_cache_pages+0x52b/0xd00 mm/page-writeback.c:2246
 generic_writepages mm/page-writeback.c:2337 [inline]
 generic_writepages+0xd7/0x140 mm/page-writeback.c:2326
 do_writepages+0xca/0x240 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x247/0x320 mm/filemap.c:424
 filemap_write_and_wait_range mm/filemap.c:657 [inline]
 filemap_write_and_wait_range+0xac/0x150 mm/filemap.c:651
 filemap_write_and_wait include/linux/fs.h:2753 [inline]
 __sync_blockdev fs/block_dev.c:513 [inline]
 sync_blockdev fs/block_dev.c:522 [inline]
 __blkdev_put+0x59b/0x6c0 fs/block_dev.c:1563
 blkdev_put+0x75/0x480 fs/block_dev.c:1632
 blkdev_close+0x8b/0xd0 fs/block_dev.c:1640
 __fput+0x209/0x870 fs/file_table.c:280
 task_work_run+0xc0/0x160 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xac8/0x25b0 kernel/exit.c:825
 do_group_exit+0xe7/0x290 kernel/exit.c:922
 get_signal+0x37f/0x1b10 kernel/signal.c:2773
 arch_do_signal_or_restart+0x2a8/0x1f80 arch/x86/kernel/signal.c:811
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x1d6/0x250 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x40/0x80 kernel/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4645a9
Code: Unable to access opcode bytes at RIP 0x46457f.
RSP: 002b:00007f51129f9218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 000000000055bfa8 RCX: 00000000004645a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000055bfac
RBP: 000000000055bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bfac
R13: 00007fff0aa622ff R14: 00007f51129f9300 R15: 0000000000022000