------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 0 PID: 2651 at block/blk-core.c:688 bio_check_ro block/blk-core.c:688 [inline]
WARNING: CPU: 0 PID: 2651 at block/blk-core.c:688 submit_bio_checks+0x163a/0x1ac0 block/blk-core.c:801
Modules linked in:
CPU: 1 PID: 2651 Comm: kworker/u4:5 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-250:0)
RIP: 0010:bio_check_ro block/blk-core.c:688 [inline]
RIP: 0010:submit_bio_checks+0x163a/0x1ac0 block/blk-core.c:801
Code: 00 00 45 0f b6 a4 24 88 05 00 00 48 8d 74 24 60 48 89 ef e8 38 21 fe ff 48 c7 c7 20 19 e2 89 48 89 c6 44 89 e2 e8 82 e8 2e 05 <0f> 0b e9 86 f3 ff ff e8 4a 55 b2 fd e8 75 86 71 05 31 ff 89 c3 89
RSP: 0018:ffffc9000ac57080 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88801bd68e40 RCX: 0000000000000000
RDX: ffff8880250fd580 RSI: ffffffff815daf18 RDI: fffff5200158ae02
RBP: ffff88806f0a7140 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d4cbe R11: 0000000000000000 R12: 0000000000000000
R13: ffff88806f0a7150 R14: ffff8881444a0bc0 R15: ffff88801bd693b4
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200000c0 CR3: 0000000070a2a000 CR4: 0000000000350ee0
Call Trace:
 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1016
 submit_bio+0x1ea/0x470 block/blk-core.c:1093
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3054
 __block_write_full_page+0x879/0x1360 fs/buffer.c:1809
 block_write_full_page+0x14d/0x190 fs/buffer.c:2980
 __writepage+0x60/0x180 mm/page-writeback.c:2320
 write_cache_pages+0x754/0x11c0 mm/page-writeback.c:2255
 generic_writepages mm/page-writeback.c:2346 [inline]
 generic_writepages+0xe2/0x150 mm/page-writeback.c:2335
 do_writepages+0x1ab/0x7b0 mm/page-writeback.c:2364
 __writeback_single_inode+0x126/0xff0 fs/fs-writeback.c:1616
 writeback_sb_inodes+0x53d/0xf00 fs/fs-writeback.c:1881
 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1950
 wb_writeback+0x7f8/0xc30 fs/fs-writeback.c:2055
 wb_check_background_flush fs/fs-writeback.c:2121 [inline]
 wb_do_writeback fs/fs-writeback.c:2209 [inline]
 wb_workfn+0xa4b/0x12d0 fs/fs-writeback.c:2237
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295