------------[ cut here ]------------
Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 1 PID: 6863 at block/blk-core.c:857 bio_check_ro block/blk-core.c:857 [inline]
WARNING: CPU: 1 PID: 6863 at block/blk-core.c:857 submit_bio_checks+0x1aba/0x1f70 block/blk-core.c:985
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6863 Comm: syz-executor505 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x4a kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:bio_check_ro block/blk-core.c:857 [inline]
RIP: 0010:submit_bio_checks+0x1aba/0x1f70 block/blk-core.c:985
Code: 04 00 00 45 8b a4 24 a4 05 00 00 48 8d 74 24 68 48 89 ef e8 f8 21 fe ff 48 c7 c7 c0 20 92 88 48 89 c6 44 89 e2 e8 08 23 bf fd <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffffc900056b7328 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880a2f1b040 RCX: 0000000000000000
RDX: ffff888094246400 RSI: ffffffff815dafc7 RDI: fffff52000ad6e57
RBP: ffff88809f458c80 R08: 0000000000000001 R09: ffff8880ae7318e7
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88809f458c88 R14: 0000000000000000 R15: ffff88809f458ca8
 submit_bio_noacct+0x89/0x12b0 block/blk-core.c:1197
 submit_bio+0x263/0x5b0 block/blk-core.c:1282
 submit_bh_wbc+0x685/0x8e0 fs/buffer.c:3070
 __block_write_full_page+0x837/0x12e0 fs/buffer.c:1810
 block_write_full_page+0x214/0x270 fs/buffer.c:2996
 __writepage+0x60/0x170 mm/page-writeback.c:2311
 write_cache_pages+0x736/0x11b0 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+0x2a1/0x380 mm/filemap.c:422
 filemap_write_and_wait_range mm/filemap.c:655 [inline]
 filemap_write_and_wait_range+0xe1/0x1c0 mm/filemap.c:649
 filemap_write_and_wait include/linux/fs.h:2627 [inline]
 __sync_blockdev fs/block_dev.c:480 [inline]
 sync_blockdev fs/block_dev.c:489 [inline]
 __blkdev_put+0x69a/0x890 fs/block_dev.c:1769
 blkdev_close+0x8c/0xb0 fs/block_dev.c:1853
 __fput+0x285/0x920 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:141
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb7d/0x29f0 kernel/exit.c:806
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_32_irqs_on arch/x86/entry/common.c:84 [inline]
 __do_fast_syscall_32+0x57/0x80 arch/x86/entry/common.c:126
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:149
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fb4549
Code: Bad RIP value.
RSP: 002b:00000000ff9dc9bc EFLAGS: 00000296 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f12d8
RDX: 0000000000000000 RSI: 00000000080daddc RDI: 00000000080f12e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..