do_anonymous_page mm/memory.c:2920 [inline]
 handle_pte_fault mm/memory.c:3763 [inline]
 __handle_mm_fault+0x4bbd/0x5be0 mm/memory.c:3889
WARNING: CPU: 0 PID: 24855 at fs/userfaultfd.c:1569 userfaultfd_unregister fs/userfaultfd.c:1569 [inline]
WARNING: CPU: 0 PID: 24855 at fs/userfaultfd.c:1569 userfaultfd_ioctl+0x3d30/0x5610 fs/userfaultfd.c:1845
Kernel panic - not syncing: panic_on_warn set ...
 handle_mm_fault+0x54f/0xc70 mm/memory.c:3926
 do_user_addr_fault arch/x86/mm/fault.c:1423 [inline]
 __do_page_fault+0x5e8/0xe60 arch/x86/mm/fault.c:1489
 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1520
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143
RIP: 0033:0x4510a0
Code: 0f 84 c4 0f 00 00 48 89 f1 48 89 f8 48 83 e1 3f 48 83 f9 20 0f 86 7b 02 00 00 48 83 e6 f0 48 83 e1 0f 66 0f ef c0 66 0f ef c9 <66> 0f 74 0e 66 0f d7 d1 48 d3 ea 49 c7 c2 11 00 00 00 49 29 ca 4d
RSP: 002b:00007efdea16e7a8 EFLAGS: 00010202
RAX: 00007efdea16e850 RBX: 0000000000000003 RCX: 000000000000000e
RDX: 00000000000003ff RSI: 0000000020012fe0 RDI: 00007efdea16e850
RBP: 000000000072bf00 R08: 00000000000003ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efdea16f6d4
R13: 00000000004c578a R14: 00000000004d9d90 R15: 00000000ffffffff
CPU: 0 PID: 24855 Comm: syz-executor1 Not tainted 4.20.0-rc6+ #371
kobject: 'loop5' (00000000a2eaaf9e): kobject_uevent_env
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+0x244/0x39d lib/dump_stack.c:113
 panic+0x2ad/0x55c kernel/panic.c:188
kobject: 'loop5' (00000000a2eaaf9e): fill_kobj_path: path = '/devices/virtual/block/loop5'
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
kobject: 'loop4' (000000001a401bbc): kobject_uevent_env
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:userfaultfd_unregister fs/userfaultfd.c:1569 [inline]
RIP: 0010:userfaultfd_ioctl+0x3d30/0x5610 fs/userfaultfd.c:1845
Code: 85 c0 f6 ff ff 48 c1 e8 03 42 80 3c 30 00 0f 84 a3 fa ff ff 48 8b bd c0 f6 ff ff e8 aa 64 db ff e9 92 fa ff ff e8 80 ff 97 ff <0f> 0b e9 cd f7 ff ff e8 74 ff 97 ff 48 8b 95 f0 f6 ff ff b9 01 00
RSP: 0018:ffff8881d8857270 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 00000000080020d0 RCX: ffffc9000e736000
RDX: 00000000000000a8 RSI: ffffffff81e784f0 RDI: 0000000000000007
RBP: ffff8881d8857c00 R08: ffff888184ece000 R09: 0000000000000008
kobject: 'loop4' (000000001a401bbc): fill_kobj_path: path = '/devices/virtual/block/loop4'
R10: 0000000000000682 R11: ffff888184ece000 R12: 0000000020013000
kobject: 'loop3' (00000000b6f03f70): kobject_uevent_env
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8881d8fd9a50
kobject: 'loop3' (00000000b6f03f70): fill_kobj_path: path = '/devices/virtual/block/loop3'
kobject: 'kvm' (000000008264ae58): kobject_uevent_env
kobject: 'kvm' (000000008264ae58): fill_kobj_path: path = '/devices/virtual/misc/kvm'
kobject: 'loop2' (00000000c50425b8): kobject_uevent_env
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
kobject: 'loop2' (00000000c50425b8): fill_kobj_path: path = '/devices/virtual/block/loop2'
kobject: 'kvm' (000000008264ae58): kobject_uevent_env
kobject: 'kvm' (000000008264ae58): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
kobject: 'loop4' (000000001a401bbc): kobject_uevent_env
RIP: 0033:0x457679
kobject: 'kvm' (000000008264ae58): kobject_uevent_env
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f613f0c6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457679
RDX: 0000000020019000 RSI: 000000008010aa01 RDI: 0000000000000003
RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f613f0c76d4
R13: 00000000004c16fe R14: 00000000004d3298 R15: 00000000ffffffff
kobject: 'loop4' (000000001a401bbc): fill_kobj_path: path = '/devices/virtual/block/loop4'
Kernel Offset: disabled
Rebooting in 86400 seconds..