------------[ cut here ]------------
Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 1 PID: 8506 at block/blk-core.c:703 bio_check_ro block/blk-core.c:703 [inline]
WARNING: CPU: 1 PID: 8506 at block/blk-core.c:703 submit_bio_checks+0x1641/0x1a70 block/blk-core.c:816
Modules linked in:
CPU: 1 PID: 8506 Comm: syz-executor728 Not tainted 5.13.0-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:703 [inline]
RIP: 0010:submit_bio_checks+0x1641/0x1a70 block/blk-core.c:816
Code: 00 00 45 0f b6 a4 24 50 05 00 00 48 8d 74 24 60 48 89 ef e8 c1 46 fe ff 48 c7 c7 00 55 e1 89 48 89 c6 44 89 e2 e8 1c 48 23 05 <0f> 0b e9 51 f3 ff ff e8 83 30 b9 fd 0f 0b e9 da f1 ff ff e8 77 30
RSP: 0018:ffffc9000167f238 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88801ef18000 RCX: 0000000000000000
RDX: ffff8880215f0000 RSI: ffffffff815d7275 RDI: fffff520002cfe39
RBP: ffff88801ee13a00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815d10de R11: 0000000000000000 R12: 0000000000000000
R13: ffff88801ee13a10 R14: ffff88801acd3700 R15: ffff88801ef18574
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfe4ef8000 CR3: 00000000273ec000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bio_noacct+0x81/0xf20 block/blk-core.c:1031
 submit_bio+0x1ea/0x470 block/blk-core.c:1108
 submit_bh_wbc+0x5eb/0x7f0 fs/buffer.c:3050
 __block_write_full_page+0x879/0x1360 fs/buffer.c:1805
 block_write_full_page+0x14d/0x190 fs/buffer.c:2976
 __writepage+0x60/0x180 mm/page-writeback.c:2314
 write_cache_pages+0x754/0x1190 mm/page-writeback.c:2249
 generic_writepages mm/page-writeback.c:2340 [inline]
 generic_writepages+0xe2/0x150 mm/page-writeback.c:2329
 do_writepages+0xec/0x290 mm/page-writeback.c:2355
 __filemap_fdatawrite_range+0x2a5/0x390 mm/filemap.c:413
 filemap_write_and_wait_range mm/filemap.c:686 [inline]
 filemap_write_and_wait_range+0x65/0x100 mm/filemap.c:680
 filemap_write_and_wait include/linux/fs.h:2891 [inline]
 __sync_blockdev fs/block_dev.c:526 [inline]
 sync_blockdev fs/block_dev.c:535 [inline]
 blkdev_put+0x7ff/0xae0 fs/block_dev.c:1530
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1584
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbd4/0x2a50 kernel/exit.c:825
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2150 kernel/signal.c:2796
 arch_do_signal_or_restart+0x2a9/0x1eb0 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x44a639
Code: Unable to access opcode bytes at RIP 0x44a60f.
RSP: 002b:00007fd716c822f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000004cb4f0 RCX: 000000000044a639
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000004cb4f8
RBP: 00000000004cb4fc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049b004
R13: 6f6f6c2f7665642f R14: 65732f636f72702f R15: 00000000004cb4f8