------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 7395 at block/blk-core.c:706 bio_check_ro block/blk-core.c:704 [inline]
WARNING: CPU: 1 PID: 7395 at block/blk-core.c:706 submit_bio_checks+0x23e/0x800 block/blk-core.c:832
Modules linked in:
CPU: 1 PID: 7395 Comm: syz-executor.2 Not tainted 5.10.0-rc7-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+0x23e/0x800 block/blk-core.c:832
Code: a2 6c 05 00 00 48 8d 75 b0 48 89 df c6 05 a4 0b a7 02 01 e8 14 88 ff ff 48 c7 c7 78 47 f6 83 48 89 c6 44 89 e2 e8 90 4f 36 01 <0f> 0b 48 8b 53 08 8b 43 28 c1 e8 09 85 c0 48 8b 72 40 0f 84 14 ff
RSP: 0018:ffffc900021b3858 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff888115b76d00 RCX: 0000000000000001
RDX: 0000000080000001 RSI: ffffffff8406eb79 RDI: 00000000ffffffff
RBP: ffffc900021b38b0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 7420676e69797254 R12: 0000000000000000
R13: ffffc900021b3c08 R14: ffff8881045ac100 R15: ffff8881045ac100
FS:  0000000000000000(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff4bfbf1000 CR3: 000000010b9f3002 CR4: 00000000001706f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x37/0x640 block/blk-core.c:1044
 submit_bio+0x3e/0x190 block/blk-core.c:1129
 submit_bh_wbc+0x168/0x190 fs/buffer.c:3054
 __block_write_full_page+0x225/0x5b0 fs/buffer.c:1810
 __writepage+0xe/0x60 mm/page-writeback.c:2311
 write_cache_pages+0x221/0x540 mm/page-writeback.c:2246
 generic_writepages+0x54/0x90 mm/page-writeback.c:2337
 do_writepages+0x39/0xe0 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0xc2/0x100 mm/filemap.c:422
 filemap_write_and_wait_range+0x36/0x90 mm/filemap.c:655
 sync_blockdev fs/block_dev.c:518 [inline]
 __blkdev_put+0x19e/0x220 fs/block_dev.c:1767
 blkdev_close+0x1f/0x30 fs/block_dev.c:1851
 __fput+0xaa/0x250 fs/file_table.c:281
 task_work_run+0x68/0xb0 kernel/task_work.c:151
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0x3b0/0xc90 kernel/exit.c:809
 do_group_exit+0x42/0xb0 kernel/exit.c:906
 get_signal+0x17c/0xc70 kernel/signal.c:2758
 arch_do_signal+0x2b/0x900 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x1a2/0x220 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cba9
Code: Unable to access opcode bytes at RIP 0x45cb7f.
RSP: 002b:00007f52def6bcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000078bfa8 RCX: 000000000045cba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bfa8
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007ffe4254418f R14: 00007f52def6c9c0 R15: 000000000078bfac