loop4: p1 p2 p3 p4 < >
BUG: unable to handle kernel paging request at ffff8801d7869000
kobject: 'loop4p1' (00000000f42706cc): kobject_uevent_env
PGD bc01067 P4D bc01067 PUD 1d9be1063 PMD 80000001d78001e3 
Oops: 000b [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30232 Comm: syz-executor3 Not tainted 4.19.0-rc7-next-20181010+ #91
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:206 [inline]
RIP: 0010:mmu_spte_clear_no_track arch/x86/kvm/mmu.c:819 [inline]
RIP: 0010:drop_parent_pte arch/x86/kvm/mmu.c:1998 [inline]
RIP: 0010:mmu_page_zap_pte+0x295/0x390 arch/x86/kvm/mmu.c:2576
Code: 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c7 85 58 ff ff ff 00 00 00 00 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 48 c1 eb 03 <49> c7 45 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 be 01 00
RSP: 0018:ffff8801c87b7150 EFLAGS: 00010a02
kobject: 'loop4p1' (00000000f42706cc): kobject_uevent_env: uevent_suppress caused the event to drop!
RAX: dffffc0000000000 RBX: 1ffff100390f6e2f RCX: ffffffff81111f3b
RDX: 1ffff1003af0d200 RSI: ffffffff8111201b RDI: 0000000000000007
RBP: ffff8801c87b7220 R08: ffff880183dc84c0 R09: fffff52000598d3a
R10: fffff52000598d3a R11: ffffc90002cc69d3 R12: 1ffff100390f6e2b
R13: ffff8801d7869000 R14: 0000000000000004 R15: 0000000000000000
FS:  00000000015f3940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d7869000 CR3: 0000000184cd7000 CR4: 00000000001426e0
Call Trace:
kobject: 'holders' (00000000feb817c1): kobject_add_internal: parent: 'loop4p1', set: '<NULL>'
 kvm_mmu_page_unlink_children arch/x86/kvm/mmu.c:2593 [inline]
 kvm_mmu_prepare_zap_page+0x210/0x1830 arch/x86/kvm/mmu.c:2637
kobject: 'loop4p1' (00000000f42706cc): kobject_uevent_env
kobject: 'loop4p1' (00000000f42706cc): fill_kobj_path: path = '/devices/virtual/block/loop4/loop4p1'
 kvm_zap_obsolete_pages arch/x86/kvm/mmu.c:5727 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x343/0x7a0 arch/x86/kvm/mmu.c:5768
kobject: 'loop4p2' (00000000da81c964): kobject_add_internal: parent: 'loop4', set: 'devices'
kobject: 'loop4p2' (00000000da81c964): kobject_uevent_env
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:9215
 kvm_mmu_notifier_release+0x59/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:497
 mmu_notifier_unregister+0x1fa/0x600 mm/mmu_notifier.c:365
kobject: 'loop4p2' (00000000da81c964): kobject_uevent_env: uevent_suppress caused the event to drop!
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:747 [inline]
 kvm_put_kvm+0x6c0/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:772
kobject: 'holders' (000000009d322c29): kobject_add_internal: parent: 'loop4p2', set: '<NULL>'
kobject: 'loop4p2' (00000000da81c964): kobject_uevent_env
 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2406
kobject: 'loop4p2' (00000000da81c964): fill_kobj_path: path = '/devices/virtual/block/loop4/loop4p2'
 __fput+0x3bc/0xa70 fs/file_table.c:279
kobject: 'loop4p3' (000000008b9db907): kobject_add_internal: parent: 'loop4', set: 'devices'
kobject: 'loop4p3' (000000008b9db907): kobject_uevent_env
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
kobject: 'loop4p3' (000000008b9db907): kobject_uevent_env: uevent_suppress caused the event to drop!
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
kobject: 'holders' (00000000f60fe822): kobject_add_internal: parent: 'loop4p3', set: '<NULL>'
RIP: 0033:0x411051
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc899a60f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411051
RDX: 0000000000000000 RSI: 00000000007307c0 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc899a6020 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000156 R15: 0000000000000003
Modules linked in:
CR2: ffff8801d7869000
---[ end trace 9ac100aee345f00a ]---
RIP: 0010:__update_clear_spte_fast include/linux/compiler.h:206 [inline]
RIP: 0010:mmu_spte_clear_no_track arch/x86/kvm/mmu.c:819 [inline]
RIP: 0010:drop_parent_pte arch/x86/kvm/mmu.c:1998 [inline]
RIP: 0010:mmu_page_zap_pte+0x295/0x390 arch/x86/kvm/mmu.c:2576
Code: 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c7 85 58 ff ff ff 00 00 00 00 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 48 c1 eb 03 <49> c7 45 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 be 01 00
kobject: 'loop4p3' (000000008b9db907): kobject_uevent_env
RSP: 0018:ffff8801c87b7150 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: 1ffff100390f6e2f RCX: ffffffff81111f3b
RDX: 1ffff1003af0d200 RSI: ffffffff8111201b RDI: 0000000000000007
RBP: ffff8801c87b7220 R08: ffff880183dc84c0 R09: fffff52000598d3a
R10: fffff52000598d3a R11: ffffc90002cc69d3 R12: 1ffff100390f6e2b
R13: ffff8801d7869000 R14: 0000000000000004 R15: 0000000000000000
FS:  00000000015f3940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d7869000 CR3: 0000000184cd7000 CR4: 00000000001426e0