kvm: emulating exchange as write
BUG: unable to handle kernel paging request at ffff8801d95b1000
PGD bc01067 P4D bc01067 PUD 1d9be0063 PMD 80000001d94001e3 
kobject: 'kvm' (00000000cd796772): kobject_uevent_env
Oops: 000b [#1] PREEMPT SMP KASAN
CPU: 0 PID: 24644 Comm: syz-executor5 Not tainted 4.19.0-rc8-next-20181018+ #97
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:2004 [inline]
RIP: 0010:mmu_page_zap_pte+0x29e/0x3a0 arch/x86/kvm/mmu.c:2582
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: 'kvm' (00000000cd796772): fill_kobj_path: path = '/devices/virtual/misc/kvm'
RSP: 0018:ffff88015207f150 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: 1ffff1002a40fe2f RCX: ffffffff811148db
RDX: 1ffff1003b2b6200 RSI: ffffffff811149bb RDI: 0000000000000007
RBP: ffff88015207f220 R08: ffff8801cf174680 R09: ffffed003b5c5b4f
R10: ffffed003b5c5b4f R11: ffff8801dae2da7b R12: 1ffff1002a40fe2b
R13: ffff8801d95b1000 R14: 0000000000000004 R15: 0000000000000000
FS:  00000000011d0940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d95b1000 CR3: 000000017049b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kvm_mmu_page_unlink_children arch/x86/kvm/mmu.c:2599 [inline]
 kvm_mmu_prepare_zap_page+0x210/0x1840 arch/x86/kvm/mmu.c:2643
 kvm_zap_obsolete_pages arch/x86/kvm/mmu.c:5794 [inline]
 kvm_mmu_invalidate_zap_all_pages+0x343/0x7a0 arch/x86/kvm/mmu.c:5835
 kvm_arch_flush_shadow_all+0x15/0x20 arch/x86/kvm/x86.c:9362
 kvm_mmu_notifier_release+0x59/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:495
 mmu_notifier_unregister+0x1fa/0x600 mm/mmu_notifier.c:365
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:745 [inline]
 kvm_put_kvm+0x6c0/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:770
 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2413
kobject: 'loop3' (00000000b76abd7a): kobject_uevent_env
 __fput+0x3bc/0xa70 fs/file_table.c:279
kobject: 'loop3' (00000000b76abd7a): fill_kobj_path: path = '/devices/virtual/block/loop3'
 ____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: 'bpq0' (0000000087065327): kobject_add_internal: parent: 'net', set: 'devices'
 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
kobject: 'bpq0' (0000000087065327): kobject_uevent_env
kobject: 'bpq0' (0000000087065327): fill_kobj_path: path = '/devices/virtual/net/bpq0'
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
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
kobject: 'queues' (0000000012ee9d35): kobject_add_internal: parent: 'bpq0', set: '<NULL>'
RSP: 002b:00007ffc7aa22f70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000733e20 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc7aa22ea0 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 000000000000031b R15: 0000000000000005
Modules linked in:
CR2: ffff8801d95b1000
---[ end trace fb6793a76413293c ]---
kobject: 'queues' (0000000012ee9d35): kobject_uevent_env
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:2004 [inline]
RIP: 0010:mmu_page_zap_pte+0x29e/0x3a0 arch/x86/kvm/mmu.c:2582
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:ffff88015207f150 EFLAGS: 00010a02
RAX: dffffc0000000000 RBX: 1ffff1002a40fe2f RCX: ffffffff811148db
RDX: 1ffff1003b2b6200 RSI: ffffffff811149bb RDI: 0000000000000007
RBP: ffff88015207f220 R08: ffff8801cf174680 R09: ffffed003b5c5b4f
kobject: 'queues' (0000000012ee9d35): kobject_uevent_env: filter function caused the event to drop!
R10: ffffed003b5c5b4f R11: ffff8801dae2da7b R12: 1ffff1002a40fe2b
R13: ffff8801d95b1000 R14: 0000000000000004 R15: 0000000000000000
FS:  00000000011d0940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8801d95b1000 CR3: 000000017049b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400