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NULL pointer dereference

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Hi there,

I found the following in my "server" log:

==============================================

BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
PGD 0 P4D 0
Oops: 0000 [#2] SMP PTI
CPU: 5 PID: 12441 Comm: awk Tainted: G      D           4.19.0-13-amd64 
#1 Debian 4.19.160-2
Hardware name: FUJITSU D3162-B1/D3162-B1, BIOS V4.6.5.3 R1.23.0 for 
D3162-B1x 12/01/2014
RIP: 0010:unmap_page_range+0x561/0xa60
Code: 80 00 00 00 01 e8 4f 2b 01 00 49 8b 07 f6 c4 80 0f 84 0e 03 00 00 
4c 89 ff e8 6b 91 fe ff 85 c0 0f 88 e6 02 00 00 49 8b 46 28 <8b> 50 08 
8d 4a 01 89 48 08 4c 89 7c d0 10 3b 48 0c 0f 84 d2 00 00
RSP: 0018:ffff9c3a49167cd0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffff8e2f47a83a10 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8e2f7dd20000
RBP: 00007faa2ed43000 R08: 0000000000000000 R09: ffff8e2ef8ae1c70
R10: ffff8e2f9e5df000 R11: 0000000000000000 R12: 00007faa2ed42000
R13: 000000014fd44025 R14: ffff9c3a49167dd0 R15: ffffd073853f5100
FS:  0000000000000000(0000) GS:ffff8e2f7e140000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000015020a003 CR4: 00000000000606e0
Call Trace:
  unmap_vmas+0x7f/0xb0
  exit_mmap+0xaa/0x180
  mmput+0x54/0x130
  do_exit+0x33f/0xbb0
  ? handle_mm_fault+0xd6/0x200
  do_group_exit+0x3a/0xa0
  __x64_sys_exit_group+0x14/0x20
  do_syscall_64+0x53/0x110
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7faa2eaa99d6
Code: Bad RIP value.
RSP: 002b:00007ffd860931d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007faa2eb9a760 RCX: 00007faa2eaa99d6
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000000000e7 R09: ffffffffffffff80
R10: 00007ffd86093096 R11: 0000000000000246 R12: 00007faa2eb9a760
R13: 0000000000000001 R14: 00007faa2eba3428 R15: 0000000000000000
Modules linked in: ppp_deflate cfg80211 rfkill 8021q garp stp mrp llc 
ppp_async crc_ccitt ppp_generic slhc nfsd auth_rpcgss nfs_acl lockd 
grace sunrpc xt_nat nft_chain_nat_ipv4 nf_nat_ipv4 nf_nat nf_conntrack 
nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ipt_REJECT nf_reject_ipv4 
nft_limit xt_limit xt_tcpudp nft_compat x_tables nft_counter nf_tables 
nfnetlink binfmt_misc bonding sch5636 sch56xx_common rc_it913x_v1 it913x 
af9033 dvb_usb_af9035 dvb_usb_v2 dvb_core rc_core snd_hda_codec_hdmi 
snd_hda_codec_conexant snd_hda_codec_generic intel_rapl i915 
x86_pkg_temp_thermal snd_hda_intel intel_powerclamp snd_hda_codec 
coretemp snd_hda_core snd_hwdep snd_pcm xhci_pci ehci_pci ahci snd_timer 
xhci_hcd drm_kms_helper ehci_hcd libahci kvm snd mei_wdt tg3 iTCO_wdt 
irqbypass mei_me e1000e drm libata usbcore
  iTCO_vendor_support soundcore lpc_ich libphy mei i2c_algo_bit 
usb_common mfd_core crct10dif_pclmul crc32_pclmul ppdev 
ghash_clmulni_intel sg i2c_i801 intel_cstate evdev intel_uncore 
pcc_cpufreq video parport_pc button intel_rapl_perf pcspkr parport ext4 
crc16 mbcache jbd2 crc32c_generic fscrypto ecb sd_mod crc32c_intel 
aacraid aesni_intel aes_x86_64 crypto_simd scsi_mod cryptd glue_helper 
thermal fan
CR2: 0000000000000008
---[ end trace 1f0672175c6e1ff0 ]---
RIP: 0010:unmap_page_range+0x55d/0xa60
Code: ff 83 ac 84 80 00 00 00 01 e8 4f 2b 01 00 49 8b 07 f6 c4 80 0f 84 
0e 03 00 00 4c 89 ff e8 6b 91 fe ff 85 c0 0f 88 e6 02 00 00 <49> 8b 46 
28 8b 50 08 8d 4a 01 89 48 08 4c 89 7c d0 10 3b 48 0c 0f
RSP: 0018:ffff9c3a43a67cd0 EFLAGS: 00010202
RAX: 0000000000000004 RBX: ffff8e2f47a0deb0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8e2f7dd20000
RBP: 00007f9f121d7000 R08: 0000000000000000 R09: ffff8e2f6a6e09c0
R10: ffff8e2f9e5df000 R11: 0000000000000000 R12: 00007f9f121d6000
R13: 000000081e49f025 R14: ffff9c3a43a67dd0 R15: ffffd073a07927c0
FS:  0000000000000000(0000) GS:ffff8e2f7e140000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa2eaa99ac CR3: 000000015020a003 CR4: 00000000000606e0
Fixing recursive fault but reboot is needed!

============================================

This is not the first time, so I suspect a persistent problem. I have no 
idea how to look for the solution. Any suggestions??
Just in case:

============================================

# lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor 
Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core 
Processor Family PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset 
Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 
Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 7 Series/C210 Series 
Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network 
Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family 
USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family 
High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI 
Express Root Port 1 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family 
USB Enhanced Host Controller #1 (rev 04)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a4)
00:1f.0 ISA bridge: Intel Corporation Q77 Express Chipset LPC Controller 
(rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series/C210 Series Chipset 
Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus 
Controller (rev 04)
00:1f.6 Signal processing controller: Intel Corporation 7 Series/C210 
Series Chipset Family Thermal Management Controller (rev 04)
01:00.0 RAID bus controller: Adaptec Series 7 6G SAS/PCIe 3 (rev 01)
02:00.0 Ethernet controller: Broadcom Limited NetXtreme BCM5719 Gigabit 
Ethernet PCIe (rev 01)
02:00.1 Ethernet controller: Broadcom Limited NetXtreme BCM5719 Gigabit 
Ethernet PCIe (rev 01)
02:00.2 Ethernet controller: Broadcom Limited NetXtreme BCM5719 Gigabit 
Ethernet PCIe (rev 01)
02:00.3 Ethernet controller: Broadcom Limited NetXtreme BCM5719 Gigabit 
Ethernet PCIe (rev 01)

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Thread

NULL pointer dereference Grzesiek Sójka <pld@sojka.co> - 2020-12-19 17:20 +0100
  Re: NULL pointer dereference David Christensen <dpchrist@holgerdanske.com> - 2020-12-19 20:50 +0100
    Re: NULL pointer dereference Grzesiek Sójka <pld@sojka.co> - 2020-12-19 21:10 +0100
  Re: NULL pointer dereference "Alexander V. Makartsev" <avbetev@gmail.com> - 2020-12-19 22:00 +0100
    Re: NULL pointer dereference Grzesiek Sójka <pld@sojka.co> - 2020-12-21 00:20 +0100
      Re: NULL pointer dereference "Thomas Schmitt" <scdbackup@gmx.net> - 2020-12-21 12:40 +0100
      Re: NULL pointer dereference "Alexander V. Makartsev" <avbetev@gmail.com> - 2020-12-21 14:10 +0100
  Re: NULL pointer dereference Marko Randjelovic <markoran@eunet.rs> - 2020-12-20 22:30 +0100
    Re: NULL pointer dereference Grzesiek Sójka <pld@sojka.co> - 2020-12-21 00:20 +0100
      Re: NULL pointer dereference deloptes <deloptes@gmail.com> - 2020-12-21 01:00 +0100

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