Backtrace

BUG: kernel NULL pointer dereference, address: 0000000000000074
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#1] SMP PTI
CPU: 4 PID: 43385 Comm: ThreadPoolForeg Not tainted 5.11.16-300.fc34.x86_64 #1
Hardware name: Dell Inc. OptiPlex 7010/0KRC95, BIOS A29 06/28/2018
RIP: 0010:unlink_anon_vmas+0x1b8/0x1d0
Code: 5d 41 5e 41 5f c3 0f 0b eb e0 0f 0b 48 83 c7 08 e8 8d bd e7 ff e9 00 ff ff ff 48 8b 04 24 48 8b 80 88 00 00 00 48 85 c0 74 cd <83> 68 34 01 e9 35 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
RSP: 0018:ffffae5002c23c50 EFLAGS: 00010202
RAX: 0000000000000040 RBX: ffff8fc364d20000 RCX: ffff8fc364d20078
RDX: 0000398c035fc000 RSI: ffffffffb12bbdbd RDI: ffff8fc364d20000
RBP: ffff8fc364d20000 R08: 0000398c035fc000 R09: 0000000000000000
R10: ffff8fc32ee0a200 R11: 0000000000000001 R12: ffff8fc364d20078
R13: ffff8fc364d20078 R14: 0000000000000000 R15: ffff8fc364d20708
FS:  0000000000000000(0000) GS:ffff8fc7c7d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000074 CR3: 0000000197afc005 CR4: 00000000001706e0
Call Trace:
 free_pgtables+0x93/0x100
 exit_mmap+0xa6/0x1c0
 mmput+0x61/0x140
 do_exit+0x30c/0xac0
 do_group_exit+0x33/0xa0
 get_signal+0x14f/0x8a0
 ? tick_sched_handle+0x22/0x60
 arch_do_signal_or_restart+0xf2/0x700
 ? __x64_sys_futex+0x73/0x1b0
 exit_to_user_mode_prepare+0xde/0x1b0
 syscall_exit_to_user_mode+0x18/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fd8a6dc8a6a
Code: Unable to access opcode bytes at RIP 0x7fd8a6dc8a40.
RSP: 002b:00007fd88b0c7370 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffdfc RBX: 00007fd88b0c74b0 RCX: 00007fd8a6dc8a6a
RDX: 0000000000000000 RSI: 0000000000000089 RDI: 00007fd88b0c7638
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000ffffffff
R10: 00007fd88b0c74b0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd88b0c7638 R14: 0000000000000000 R15: 00007fd88b0c75e8
Modules linked in: snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp 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 rfkill ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter sunrpc snd_hda_codec_realtek intel_rapl_msr intel_rapl_common snd_hda_codec_generic snd_hda_codec_hdmi ledtrig_audio snd_hda_intel x86_pkg_temp_thermal intel_powerclamp snd_intel_dspcfg coretemp soundwire_intel soundwire_generic_allocation snd_soc_core kvm_intel snd_compress snd_pcm_dmaengine uvcvideo soundwire_cadence videobuf2_vmalloc snd_hda_codec kvm snd_usb_audio iTCO_wdt snd_hda_core videobuf2_memops intel_pmc_bxt
 snd_usbmidi_lib at24 ac97_bus snd_rawmidi snd_hwdep iTCO_vendor_support irqbypass snd_seq videobuf2_v4l2 videobuf2_common snd_seq_device rapl dell_wmi snd_pcm intel_cstate videodev i2c_i801 snd_timer dell_smbios dcdbas intel_uncore snd pcspkr sparse_keymap dell_wmi_descriptor wmi_bmof i2c_smbus mc lpc_ich soundcore zram ip_tables radeon i2c_algo_bit drm_ttm_helper ttm drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel cec ghash_clmulni_intel drm e1000e serio_raw r8169 wmi video fuse
CR2: 0000000000000074