------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 7687 at block/blk-core.c:2177 bio_check_ro block/blk-core.c:2177 [inline]
WARNING: CPU: 1 PID: 7687 at block/blk-core.c:2177 generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2282
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7687 Comm: syz-executor044 Not tainted 4.19.81 #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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x53 kernel/panic.c:541
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:bio_check_ro block/blk-core.c:2177 [inline]
RIP: 0010:generic_make_request_checks+0x1fc5/0x24c0 block/blk-core.c:2282
Code: 85 1f 04 00 00 45 8b b6 e4 04 00 00 48 8d 73 a0 4c 89 e7 e8 0d 63 06 00 48 c7 c7 60 91 80 87 48 89 c6 44 89 f2 e8 e9 ae 2f fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffff8880969cf3a8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880969cf478 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81553f06 RDI: ffffed1012d39e67
RBP: ffff8880969cf4a0 R08: ffff8880982c2140 R09: ffffed1015d25079
R10: ffffed1015d25078 R11: ffff8880ae9283c7 R12: ffff8880a949ae00
R13: ffff8880a949ae08 R14: 0000000000000000 R15: 0000000000000000
kobject: 'nullb0' (00000000080cd2b4): kobject_uevent_env
kobject: 'nullb0' (00000000080cd2b4): fill_kobj_path: path = '/devices/virtual/block/nullb0'
 generic_make_request+0x24c/0x12d0 block/blk-core.c:2406
 blk_queue_split+0x8fa/0x1bd0 block/blk-merge.c:226
 blk_mq_make_request+0x15e/0x1de0 block/blk-mq.c:1834
 generic_make_request+0x747/0x12d0 block/blk-core.c:2461
 submit_bio+0xba/0x480 block/blk-core.c:2570
 next_bio+0x4a/0x60 block/blk-lib.c:20
 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:294
 blkdev_issue_zeroout+0x42c/0x4c0 block/blk-lib.c:388
 blk_ioctl_zeroout block/ioctl.c:263 [inline]
 blkdev_ioctl+0x113b/0x1ab6 block/ioctl.c:530
 block_ioctl+0xee/0x130 fs/block_dev.c:1891
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446799
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8c85850db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000446799
RDX: 0000000020000080 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffc320cf41f R14: 00007f8c858519c0 R15: 000000000000002d
Kernel Offset: disabled
Rebooting in 86400 seconds..