------------[ cut here ]------------
Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 6828 at block/blk-core.c:859 bio_check_ro block/blk-core.c:857 [inline]
WARNING: CPU: 1 PID: 6828 at block/blk-core.c:859 submit_bio_checks+0x1422/0x19e0 block/blk-core.c:985
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6828 Comm: syz-executor900 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+0x1f0/0x31e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 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+0x1422/0x19e0 block/blk-core.c:985
Code: 48 b9 00 00 00 00 00 fc ff df 8a 04 08 84 c0 0f 85 ab 05 00 00 41 8b 14 24 48 c7 c7 ae 4c 15 89 4c 89 fe 31 c0 e8 8e b9 ba fd <0f> 0b 4c 8b 6c 24 10 4c 8b 7c 24 20 e9 ac f4 ff ff 44 89 f9 80 e1
RSP: 0018:ffffc90001c07430 EFLAGS: 00010246
RAX: 05ec74c8d25bb200 RBX: 0000000000000001 RCX: ffff8880972d23c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90001c07500 R08: ffffffff815e2109 R09: ffffed1015d262c0
R10: ffffed1015d262c0 R11: 0000000000000000 R12: ffff8880a08135a4
R13: ffff8880a17d8440 R14: 1ffff110142fb089 R15: ffffc90001c074a0
 submit_bio_noacct+0x36/0xf90 block/blk-core.c:1197
 submit_bio+0x1a4/0x620 block/blk-core.c:1282
 __block_write_full_page+0x8bb/0x1000 fs/buffer.c:1810
 __writepage+0x60/0x110 mm/page-writeback.c:2311
 write_cache_pages+0x8bb/0xda0 mm/page-writeback.c:2246
 generic_writepages+0x8f/0xd0 mm/page-writeback.c:2337
 do_writepages+0xda/0x1f0 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x2a5/0x350 mm/filemap.c:422
 filemap_write_and_wait_range+0xca/0x160 mm/filemap.c:655
 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+0x111/0x7a0 fs/block_dev.c:1769
 blkdev_close+0x7a/0xa0 fs/block_dev.c:1853
 __fput+0x34f/0x7b0 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:141
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0x5f3/0x1f20 kernel/exit.c:806
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 get_signal+0x13bb/0x1d50 kernel/signal.c:2757
 arch_do_signal+0x33/0x610 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:135 [inline]
 exit_to_user_mode_prepare+0x8d/0x1b0 kernel/entry/common.c:166
 syscall_exit_to_user_mode+0x5e/0x1a0 kernel/entry/common.c:241
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x445949
Code: Bad RIP value.
RSP: 002b:00007f00d610adb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445949
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38
RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c
R13: 00007ffda417b05f R14: 00007f00d610b9c0 R15: 20c49ba5e353f7cf
Kernel Offset: disabled
Rebooting in 86400 seconds..