Backtrace

BUG: unable to handle page fault for address: 0000000000402055
#PF: supervisor read access in kernel mode
#PF: error_code(0x0001) - permissions violation
PGD 128c07067 P4D 128c07067 PUD 10e44f067 PMD 130d19067 PTE 80000000a3523025
Oops: 0001 [#1] SMP NOPTI
CPU: 3 PID: 51068 Comm: test_char_dev Tainted: G           OE     5.14.18-100.fc33.x86_64 #1
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020
RIP: 0010:string+0x49/0xd0
Code: ff 77 36 45 89 d1 31 f6 49 01 f9 66 45 85 d2 75 19 eb 1e 49 39 f8 76 02 88 07 48 83 c7 01 83 c6 01 48 83 c2 01 4c 39 cf 74 07 <0f> b6 02 84 c0 75 e2 4c 89 c2 e9 98 e4 ff ff 48 c7 c0 a8 41 63 bc
RSP: 0018:ffffa35350e33d08 EFLAGS: 00010006
RAX: 0000000000401055 RBX: ffffa35350e33da0 RCX: 00170a00ffffff04
RDX: 0000000000402055 RSI: 0000000000000000 RDI: ffffa35350e33deb
RBP: ffffa35350e33deb R08: ffffa35350e33de0 R09: ffffa35350e33e02
R10: 0000000000000017 R11: ffff8c263fec38a8 R12: ffffa35350e33de0
R13: ffffffffc07250b5 R14: 0000000000000008 R15: ffffffffc07250b5
FS:  00007fb392b3d540(0000) GS:ffff8c2639ec0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000402055 CR3: 000000010bb64005 CR4: 0000000000770ee0
PKRU: 55555554
Call Trace:
 vsnprintf+0x250/0x4e0
 vprintk_store+0xaa/0x430
 vprintk_emit+0xe6/0x260
 printk+0x48/0x4a
 ? selinux_file_permission+0xe2/0x120
 device_write+0x2d/0x35 [simple_char_dev]
 vfs_write+0xbd/0x260
 ksys_write+0x4f/0xc0
 do_syscall_64+0x38/0x90
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb392a62e87
Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
RSP: 002b:00007fffb9272348 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb392a62e87
RDX: 0000000000000017 RSI: 0000000000402055 RDI: 0000000000000003
RBP: 00007fffb92723d0 R08: 00007fb392afa040 R09: 00007fb392afa0c0
R10: 0000000000400450 R11: 0000000000000246 R12: 00000000004010a0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in: simple_char_dev(OE) pfc(OE) uinput isofs rfcomm xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun bridge stp llc nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter bnep vsock_loopback vmw_vsock_virtio_transport_common snd_seq_midi snd_seq_midi_event vmw_vsock_vmci_transport vsock sunrpc snd_ens1371 intel_rapl_msr intel_rapl_common snd_ac97_codec snd_rawmidi btusb rapl gameport ac97_bus snd_seq vmw_balloon btrtl btbcm btintel bluetooth snd_seq_device snd_pcm joydev pcspkr ecdh_generic rfkill snd_timer snd soundcore vmw_vmci i2c_piix4 zram ip_tables vmwgfx ttm
 drm_kms_helper crct10dif_pclmul cec crc32_pclmul drm crc32c_intel ghash_clmulni_intel mptspi scsi_transport_spi mptscsih serio_raw mptbase vmxnet3 ata_generic pata_acpi fuse [last unloaded: simple_char_dev]
CR2: 0000000000402055