------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device nullb0 (partno 0)
WARNING: CPU: 1 PID: 8927 at block/blk-core.c:829 bio_check_ro block/blk-core.c:829 [inline]
WARNING: CPU: 1 PID: 8927 at block/blk-core.c:829 generic_make_request_checks+0x1c78/0x2190 block/blk-core.c:930
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 8927 Comm: syz-executor931 Not tainted 5.4.0-rc8-next-20191122-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+0x197/0x210 lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:221
 __warn.cold+0x2f/0x35 kernel/panic.c:582
 report_bug+0x289/0x300 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 fixup_bug arch/x86/kernel/traps.c:169 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:bio_check_ro block/blk-core.c:829 [inline]
RIP: 0010:generic_make_request_checks+0x1c78/0x2190 block/blk-core.c:930
Code: 00 00 44 8b ab 5c 05 00 00 48 8d b5 78 ff ff ff 4c 89 ff e8 aa 91 05 00 48 c7 c7 c0 8f e5 87 48 89 c6 44 89 ea e8 e0 24 11 fe <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02
RSP: 0018:ffff8880923ff370 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff8880a32ed000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815d88c6 RDI: ffffed101247fe60
RBP: ffff8880923ff470 R08: ffff8880919ba300 R09: ffffed1015d26621
R10: ffffed1015d26620 R11: ffff8880ae933107 R12: ffff88809883d108
R13: 0000000000000000 R14: 0000000000000001 R15: ffff88809883d100
 generic_make_request+0x8f/0xb00 block/blk-core.c:1049
 __blk_queue_split+0x4e9/0x1790 block/blk-merge.c:347
 blk_mq_make_request+0x17d/0x2280 block/blk-mq.c:1920
 generic_make_request block/blk-core.c:1095 [inline]
 generic_make_request+0x23c/0xb00 block/blk-core.c:1037
 submit_bio+0x113/0x600 block/blk-core.c:1221
 blk_next_bio+0x4a/0x60 block/blk-lib.c:19
 __blkdev_issue_zero_pages+0x151/0x430 block/blk-lib.c:284
 blkdev_issue_zeroout+0x434/0x4c0 block/blk-lib.c:378
 blk_ioctl_zeroout block/ioctl.c:237 [inline]
 blkdev_ioctl+0x1451/0x1dc0 block/ioctl.c:504
 block_ioctl+0xee/0x130 fs/block_dev.c:1983
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 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:00007f4ca4e0cdb8 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: 00007ffe0211433f R14: 00007f4ca4e0d9c0 R15: 000000000000002d
Kernel Offset: disabled
Rebooting in 86400 seconds..