------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 0 PID: 8391 at block/blk-core.c:704 bio_check_ro block/blk-core.c:704 [inline]
WARNING: CPU: 0 PID: 8391 at block/blk-core.c:704 submit_bio_checks+0x165c/0x1aa0 block/blk-core.c:817
Modules linked in:
CPU: 0 PID: 8391 Comm: syz-executor175 Not tainted 5.12.0-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+0x165c/0x1aa0 block/blk-core.c:817
Code: 00 00 45 0f b6 a4 24 e0 05 00 00 48 8d 74 24 60 48 89 ef e8 c6 3e fe ff 48 c7 c7 60 ae bf 89 48 89 c6 44 89 e2 e8 7c dc 10 05 <0f> 0b e9 36 f3 ff ff e8 a8 87 bf fd 0f 0b e9 bf f1 ff ff e8 9c 87
RSP: 0018:ffffc90001aa7310 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880129ed168 RCX: 0000000000000000
RDX: ffff88802839a380 RSI: ffffffff815b73d5 RDI: fffff52000354e54
RBP: ffff8880145cda40 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815b013e R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880145cda50 R14: ffff88814419b3c0 R15: ffff8880129ed674
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000480df8 CR3: 000000000bc8e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1032
 submit_bio+0x263/0x5e0 block/blk-core.c:1118
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3055
 __block_write_full_page+0x86c/0x1340 fs/buffer.c:1810
 block_write_full_page+0x14d/0x190 fs/buffer.c:2981
 __writepage+0x60/0x180 mm/page-writeback.c:2311
 write_cache_pages+0x759/0x11a0 mm/page-writeback.c:2246
 generic_writepages mm/page-writeback.c:2337 [inline]
 generic_writepages+0xe2/0x150 mm/page-writeback.c:2326
 do_writepages+0xec/0x290 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x2a5/0x390 mm/filemap.c:424
 filemap_write_and_wait_range mm/filemap.c:657 [inline]
 filemap_write_and_wait_range+0xe1/0x1c0 mm/filemap.c:651
 filemap_write_and_wait include/linux/fs.h:2753 [inline]
 __sync_blockdev fs/block_dev.c:526 [inline]
 sync_blockdev fs/block_dev.c:535 [inline]
 __blkdev_put+0x6b7/0x800 fs/block_dev.c:1576
 blkdev_put+0x92/0x580 fs/block_dev.c:1645
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1653
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:140
 exit_task_work include/linux/task_work.h:30 [inline]
 do_exit+0xbfc/0x2a60 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43da99
Code: Unable to access opcode bytes at RIP 0x43da6f.
RSP: 002b:00007ffc35558948 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da99
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ae230
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001