------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 6816 at block/blk-core.c:855 bio_check_ro block/blk-core.c:852 [inline]
WARNING: CPU: 1 PID: 6816 at block/blk-core.c:855 generic_make_request_checks+0x63f/0x17d0 block/blk-core.c:988
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 6816 Comm: syz-executor587 Not tainted 5.8.0-rc3-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:235
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:563
RIP: 0010:bio_check_ro block/blk-core.c:852 [inline]
RIP: 0010:generic_make_request_checks+0x63f/0x17d0 block/blk-core.c:988
Code: ac 05 00 00 4c 89 f8 48 c1 e8 03 8a 04 08 84 c0 0f 85 78 11 00 00 41 8b 17 48 c7 c7 c7 13 f4 88 4c 89 f6 31 c0 e8 d1 ac bd fd <0f> 0b e9 29 fc ff ff e8 55 e6 eb fd c6 05 58 67 e0 05 01 48 c7 c7
RSP: 0018:ffffc90001277630 EFLAGS: 00010246
RAX: 8ad064b753fe7f00 RBX: 0000000000000001 RCX: ffff888095d5e180
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900012776f0 R08: ffffffff815dc419 R09: ffffed1015d262c0
R10: ffffed1015d262c0 R11: 0000000000000000 R12: ffff88809f86b948
R13: 1ffff11013f0d729 R14: ffffc90001277690 R15: ffff8880a11635ac
 generic_make_request+0x36/0xab0 block/blk-core.c:1112
 submit_bio+0x1a4/0x620 block/blk-core.c:1275
 __block_write_full_page+0x8bb/0x1000 fs/buffer.c:1811
 __writepage+0x60/0x110 mm/page-writeback.c:2313
 write_cache_pages+0x8bb/0xda0 mm/page-writeback.c:2248
 generic_writepages+0x8f/0xd0 mm/page-writeback.c:2339
 do_writepages+0xda/0x1f0 mm/page-writeback.c:2354
 __filemap_fdatawrite_range+0x2a5/0x350 mm/filemap.c:421
 filemap_write_and_wait_range+0xca/0x160 mm/filemap.c:654
 filemap_write_and_wait include/linux/fs.h:2765 [inline]
 __sync_blockdev fs/block_dev.c:490 [inline]
 sync_blockdev fs/block_dev.c:499 [inline]
 __blkdev_put+0x111/0x7a0 fs/block_dev.c:1886
 blkdev_close+0x7a/0xa0 fs/block_dev.c:1970
 __fput+0x2f0/0x750 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0x601/0x1f80 kernel/exit.c:805
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:914
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43ee48
Code: Bad RIP value.
RSP: 002b:00007fff7b3e2f08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..