The kernel crashes due to NULL pointer dereference occurring in rmap_get_first()

Issue

• The kernel crashes due to NULL pointer dereference occurring in rmap_get_first()

[10812977.307481] BUG: unable to handle kernel NULL pointer dereference at 0000000000000100
[10812977.315603] PGD 43e2b57067 P4D 0 
[10812977.319193] Oops: 0000 [#1] SMP NOPTI
[10812977.323133] CPU: 85 PID: 540803 Comm: qemu-kvm Kdump: loaded Tainted: G        W        --------- -  - 4.18.0-305.el8.x86_64 #1
[10812977.334904] Hardware name: Inspur NF5468M6/NF5468M6, BIOS 06.01.01 04/25/2022
[10812977.342351] RIP: 0010:rmap_get_first.isra.71+0x21/0x60 [kvm]
[10812977.348288] Code: 4d 8f 05 00 0f 94 c0 c3 90 0f 1f 44 00 00 48 8b 07 48 85 c0 74 38 a8 01 74 37 48 83 e0 fe 48 89 06 c7 02 00 00 00 00 48 8b 00 <48> 8b 10 48 89 d1 48 0f ba f1 3b 48 85 c9 74 12 48 b9 00 00 00 00
[10812977.367353] RSP: 0000:ff545847cfb43bc8 EFLAGS: 00010246
[10812977.372854] RAX: 0000000000000100 RBX: 0000000000000001 RCX: 00000000009a389a
[10812977.380269] RDX: ff545847cfb43bd8 RSI: ff545847cfb43bd0 RDI: ff545848a451d4d0
[10812977.387686] RBP: ff545848a451d4d0 R08: 0000000000000001 R09: 0000000000000000
[10812977.395097] R10: 00bce0b409d07a3d R11: 00266aa5078f8800 R12: 0000000000000000
[10812977.402514] R13: ff545847cfb43bd8 R14: ff1cd4a93044b410 R15: 0000000000000000
[10812977.409926] FS:  00007fc9ba3bef00(0000) GS:ff1cd4c92f940000(0000) knlGS:0000000000000000
[10812977.418300] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[10812977.424324] CR2: 0000000000000100 CR3: 00000041eefc4006 CR4: 0000000000773ee0
[10812977.431739] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[10812977.439158] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[10812977.446582] Call Trace:
[10812977.449334]  kvm_zap_rmapp.constprop.144+0x53/0x80 [kvm]
[10812977.454941]  ? kvm_zap_rmapp.constprop.144+0x80/0x80 [kvm]
[10812977.460719]  kvm_unmap_rmapp+0xd/0x20 [kvm]
[10812977.465937]  kvm_handle_hva_range+0x151/0x1c0 [kvm]
[10812977.471827]  kvm_unmap_hva_range+0x22/0x50 [kvm]
[10812977.477431]  kvm_mmu_notifier_invalidate_range_start+0x49/0x80 [kvm]
[10812977.484767]  __mmu_notifier_invalidate_range_start+0xfc/0x120
[10812977.491483]  change_p4d_range+0x967/0xa60
[10812977.496459]  ? set_fd_set.part.7+0x40/0x40
[10812977.501515]  ? seccomp_run_filters+0x6b/0x120
[10812977.506909]  change_protection+0x12f/0x1c0
[10812977.511961]  change_prot_numa+0x18/0x30
[10812977.516747]  task_numa_work+0x1ed/0x300
[10812977.521535]  task_work_run+0x8a/0xb0
[10812977.526067]  exit_to_usermode_loop+0xeb/0xf0
[10812977.531309]  prepare_exit_to_usermode+0x9b/0xa0
[10812977.536819]  retint_user+0x8/0x8
[10812977.541013] RIP: 0033:0x557763af690b
[10812977.545552] Code: 31 c0 48 8b 47 18 48 c7 44 24 40 00 00 00 00 49 89 c7 48 89 44 24 10 e8 83 e4 0c 00 90 4c 89 f8 48 05 b0 00 00 00 48 89 04 24 <48> 85 db 0f 84 4c 02 00 00 48 8d 44 24 40 45 31 ed 48 89 44 24 08
[10812977.566028] RSP: 002b:00007fbe962f0be0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
[10812977.574627] RAX: 0000557764ccfd00 RBX: 0000000000001000 RCX: 0000557764ba6778
[10812977.582792] RDX: 0000000000001000 RSI: 00000007d816e000 RDI: 0000557764cd0360
[10812977.590963] RBP: 00000007d816e000 R08: 0000000000000000 R09: 0000000000000000
[10812977.599149] R10: 0000000008ccfd04 R11: 00000000692affff R12: 0000557764cd0360
[10812977.607329] R13: 0000557764ba6778 R14: 0000000000000000 R15: 0000557764ccfc50
[10812977.615519] Modules linked in: ...
[10812977.615558]  ...
[10812977.749640] Features: eBPF/rawtrace
[10812977.754313] CR2: 0000000000000100