hfs: can't find a HFS filesystem on dev loop0
WARNING: CPU: 0 PID: 4504 at fs/attr.c:213 notify_change+0xd94/0x10c0 fs/attr.c:213
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4504 Comm: syzkaller788011 Not tainted 4.17.0-rc1+ #8
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+0x1b9/0x294 lib/dump_stack.c:113
 panic+0x22f/0x4de kernel/panic.c:184
 __warn.cold.8+0x163/0x1b3 kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:notify_change+0xd94/0x10c0 fs/attr.c:213
RSP: 0018:ffff8801d958f880 EFLAGS: 00010293
RAX: ffff8801d913a340 RBX: ffff8801d2efa100 RCX: ffffffff81c77718
RDX: 0000000000000000 RSI: ffffffff81c78354 RDI: 0000000000000007
RBP: ffff8801d958f950 R08: ffff8801d913a340 R09: ffffed003a5df43c
R10: ffffed003a5df43c R11: ffff8801d2efa1e7 R12: 0000000000004200
R13: ffff8801d958f990 R14: ffff8801d4fa8e00 R15: 1ffff1003b2b1f1c
 __remove_privs fs/inode.c:1812 [inline]
 file_remove_privs+0x2bf/0x530 fs/inode.c:1834
 __generic_file_write_iter+0x169/0x630 mm/filemap.c:3211
 blkdev_write_iter+0x233/0x420 fs/block_dev.c:1910
 call_write_iter include/linux/fs.h:1784 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x64d/0x960 fs/read_write.c:487
 vfs_write+0x1f8/0x560 fs/read_write.c:549
 ksys_write+0xf9/0x250 fs/read_write.c:598
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x73/0xb0 fs/read_write.c:607
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440959
RSP: 002b:00007ffee892eb48 EFLAGS: 00000217 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440959
RDX: 0000000000000158 RSI: 00000000200004c0 RDI: 0000000000000005
RBP: 00000000006cb018 R08: 0000000020000780 R09: 00000000004002c8
R10: 000000000000000a R11: 0000000000000217 R12: 0000000000402140
R13: 00000000004021d0 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..