------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 0 PID: 28399 at block/blk-core.c:800 bio_check_ro block/blk-core.c:797 [inline]
WARNING: CPU: 0 PID: 28399 at block/blk-core.c:800 generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 28399 Comm: syz-executor.3 Not tainted 5.4.0-rc8-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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x20e/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0xd7/0x440 arch/x86/kernel/traps.c:272
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:291
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:bio_check_ro block/blk-core.c:797 [inline]
RIP: 0010:generic_make_request_checks+0x633/0x1a60 block/blk-core.c:902
Code: 3c 05 00 00 4c 89 f8 48 c1 e8 03 8a 04 08 84 c0 0f 85 17 14 00 00 41 8b 17 48 c7 c7 73 98 40 88 4c 89 f6 31 c0 e8 0d 5d 14 fe <0f> 0b e9 35 fc ff ff e8 41 c6 41 fe c6 05 36 56 89 05 01 48 c7 c7
RSP: 0018:ffff88808bf176a0 EFLAGS: 00010246
RAX: 5778317b5f162900 RBX: 0000000000000001 RCX: 0000000000040000
RDX: ffffc9000c598000 RSI: 0000000000014801 RDI: 0000000000014802
RBP: ffff88808bf17760 R08: ffffffff815cc074 R09: ffffed1015d46120
R10: ffffed1015d46120 R11: 0000000000000000 R12: ffff88808d8575c8
R13: 1ffff11011b0aeb9 R14: ffff88808bf17700 R15: ffff8880a2e9753c
 generic_make_request+0x33/0x980 block/blk-core.c:1018
 submit_bio+0x26b/0x540 block/blk-core.c:1190
 submit_bh_wbc+0x619/0x700 fs/buffer.c:3095
 __block_write_full_page+0x943/0x1070 fs/buffer.c:1767
 block_write_full_page+0x1a4/0x220 include/linux/highmem.h:102
 blkdev_writepage+0x24/0x30 fs/block_dev.c:609
 __writepage+0x63/0xd0 mm/page-writeback.c:2303
 write_cache_pages+0x94a/0xe70 mm/page-writeback.c:2238
 generic_writepages+0x93/0xd0 mm/page-writeback.c:2329
 blkdev_writepages+0x1d/0x30 fs/block_dev.c:2031
 do_writepages+0xfb/0x1f0 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x2c2/0x360 mm/filemap.c:421
 file_write_and_wait_range+0xf7/0x1a0 mm/filemap.c:782
 blkdev_fsync+0x6c/0xd0 fs/block_dev.c:666
 vfs_fsync_range+0xfd/0x1a0 fs/sync.c:197
 __do_sys_msync mm/msync.c:92 [inline]
 __se_sys_msync+0x3a8/0x490 mm/msync.c:32
 __x64_sys_msync+0x7b/0x90 mm/msync.c:32
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a639
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa55530dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639
RDX: 0000000000000004 RSI: 087abbe8d1cc6ad9 RDI: 0000000020952000
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa55530e6d4
R13: 00000000004c72da R14: 00000000004dceb0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..