------------[ cut here ]------------
generic_make_request: Trying to write to read-only block-device loop0 (partno 0)
WARNING: CPU: 1 PID: 8843 at block/blk-core.c:2172 bio_check_ro block/blk-core.c:2169 [inline]
WARNING: CPU: 1 PID: 8843 at block/blk-core.c:2172 generic_make_request_checks+0x14f9/0x2c00 block/blk-core.c:2274
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8843 Comm: syz-executor4 Not tainted 4.19.0-rc1+ #40
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+0x14b/0x190 lib/dump_stack.c:113
 panic+0x35d/0x8cb kernel/panic.c:184
 __warn+0x40a/0x590 kernel/panic.c:536
 report_bug+0x65c/0x850 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x1c0/0x620 arch/x86/kernel/traps.c:298
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:318
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1000
RIP: 0010:bio_check_ro block/blk-core.c:2169 [inline]
RIP: 0010:generic_make_request_checks+0x14f9/0x2c00 block/blk-core.c:2274
Code: 86 50 06 00 00 89 8e 70 09 00 00 48 c7 86 80 0c 00 00 00 00 00 00 48 c7 c7 c4 cd 90 89 31 c0 4c 89 e6 44 89 fa e8 e7 0e 12 fd <0f> 0b 48 83 7c 24 10 00 0f 85 e3 16 00 00 48 8b 7c 24 40 4c 8b 3f
RSP: 0018:ffff8801bf8cf9d0 EFLAGS: 00010286
RAX: 0000000000000050 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90002b86000 RSI: 0000000000002621 RDI: 0000000000002622
RBP: ffff8801bf8cfb20 R08: 0000000000480020 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff854248c0 R12: ffff8801bf8cfa90
R13: 0000000000000000 R14: ffff88012ddbc400 R15: 0000000000000000
 generic_make_request+0x230/0x1990 block/blk-core.c:2398
 submit_bio+0x2e4/0x740 block/blk-core.c:2563
 submit_bio_wait+0x165/0x240 block/bio.c:936
 blkdev_issue_flush+0x326/0x5b0 block/blk-flush.c:553
 blkdev_fsync+0x177/0x1f0 fs/block_dev.c:633
 vfs_fsync_range fs/sync.c:197 [inline]
 vfs_fsync fs/sync.c:211 [inline]
 do_fsync fs/sync.c:221 [inline]
 __do_sys_fdatasync fs/sync.c:234 [inline]
 __se_sys_fdatasync+0x139/0x240 fs/sync.c:232
 __x64_sys_fdatasync+0x32/0x50 fs/sync.c:232
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457099
Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2713c31c78 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f2713c326d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cbf38 R14: 00000000004c353b R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..