------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 8422 at block/blk-core.c:703 bio_check_ro block/blk-core.c:701 [inline]
WARNING: CPU: 1 PID: 8422 at block/blk-core.c:703 submit_bio_checks+0x1044/0x1540 block/blk-core.c:814
Modules linked in:
CPU: 1 PID: 8422 Comm: syz-executor169 Not tainted 5.14.0-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:701 [inline]
RIP: 0010:submit_bio_checks+0x1044/0x1540 block/blk-core.c:814
Code: 03 48 b9 00 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 f1 04 00 00 0f b6 13 48 c7 c7 c0 08 91 8a 4c 89 f6 31 c0 e8 ec 99 5d fd <0f> 0b 49 bd 00 00 00 00 00 fc ff df 4c 8b 74 24 18 e9 ca f3 ff ff
RSP: 0018:ffffc900010ff280 EFLAGS: 00010246
RAX: 1b3b093b709ed400 RBX: ffff88814558c750 RCX: ffff888028c28000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900010ff3b0 R08: ffffffff81660b82 R09: ffffed10173a9798
R10: ffffed10173a9798 R11: 0000000000000000 R12: ffff888022926788
R13: dffffc0000000000 R14: ffffc900010ff320 R15: 1ffff11004524cf1
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000480db8 CR3: 00000000379ba000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x92/0x11f0 block/blk-core.c:1029
 submit_bio+0x2d7/0x540 block/blk-core.c:1106
 __block_write_full_page+0x8fb/0x10a0 fs/buffer.c:1805
 __writepage+0x60/0x120 mm/page-writeback.c:2314
 write_cache_pages+0x990/0xf10 mm/page-writeback.c:2249
 generic_writepages+0xe4/0x150 mm/page-writeback.c:2340
 do_writepages+0x12e/0x2b0 mm/page-writeback.c:2355
 __filemap_fdatawrite_range+0x32d/0x400 mm/filemap.c:413
 filemap_write_and_wait_range+0x62/0xe0 mm/filemap.c:686
 filemap_write_and_wait include/linux/fs.h:2897 [inline]
 __sync_blockdev fs/block_dev.c:526 [inline]
 sync_blockdev fs/block_dev.c:535 [inline]
 blkdev_put+0xdd/0x810 fs/block_dev.c:1530
 blkdev_close+0x7a/0xa0 fs/block_dev.c:1584
 __fput+0x352/0x7b0 fs/file_table.c:280
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x72b/0x2510 kernel/exit.c:825
 do_group_exit+0x168/0x2d0 kernel/exit.c:922
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:933
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43da59
Code: Unable to access opcode bytes at RIP 0x43da2f.
RSP: 002b:00007ffeac07ef68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da59
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00000000004ae230
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001