BUG: kernel NULL pointer dereference, address: 0000000000000008

ctrlshifti · Jun 25, 2024

Hello. My hypervisor is consistently shutting down due to a bug, while running Proxmox Virtual Environment 8.2.4.

$ pveversion -v:

Code:

proxmox-ve: 8.2.0 (running kernel: 6.8.8-1-pve)
pve-manager: 8.2.4 (running version: 8.2.4/faa83925c9641325)
proxmox-kernel-helper: 8.1.0
proxmox-kernel-6.8: 6.8.8-1
proxmox-kernel-6.8.8-1-pve-signed: 6.8.8-1
proxmox-kernel-6.8.4-3-pve-signed: 6.8.4-3
amd64-microcode: 3.20230808.1.1~deb12u1
ceph-fuse: 16.2.11+ds-2
corosync: 3.1.7-pve3
criu: 3.17.1-2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx8
intel-microcode: 3.20231114.1~deb12u1
libjs-extjs: 7.0.0-4
libknet1: 1.28-pve1
libproxmox-acme-perl: 1.5.1
libproxmox-backup-qemu0: 1.4.1
libproxmox-rs-perl: 0.3.3
libpve-access-control: 8.1.4
libpve-apiclient-perl: 3.3.2
libpve-cluster-api-perl: 8.0.7
libpve-cluster-perl: 8.0.7
libpve-common-perl: 8.2.1
libpve-guest-common-perl: 5.1.3
libpve-http-server-perl: 5.1.0
libpve-network-perl: 0.9.8
libpve-rs-perl: 0.8.9
libpve-storage-perl: 8.2.2
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.4.0-3
proxmox-backup-client: 3.2.4-1
proxmox-backup-file-restore: 3.2.4-1
proxmox-firewall: 0.4.2
proxmox-kernel-helper: 8.1.0
proxmox-mail-forward: 0.2.3
proxmox-mini-journalreader: 1.4.0
proxmox-offline-mirror-helper: 0.6.6
proxmox-widget-toolkit: 4.2.3
pve-cluster: 8.0.7
pve-container: 5.1.12
pve-docs: 8.2.2
pve-edk2-firmware: not correctly installed
pve-esxi-import-tools: 0.7.1
pve-firewall: 5.0.7
pve-firmware: 3.12-1
pve-ha-manager: 4.0.5
pve-i18n: 3.2.2
pve-qemu-kvm: 8.1.5-6
pve-xtermjs: 5.3.0-3
qemu-server: 8.2.1
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.8.0+pve1
vncterm: 1.8.0
zfsutils-linux: 2.2.4-pve1

CPU (1 socket):

Code:

Intel(R) Xeon(R) E-2136 CPU @ 3.30GHz

Log from journalctl:

Code:

Jun 25 11:52:38  kernel: BUG: kernel NULL pointer dereference, address: 0000000000000008
Jun 25 11:52:38  kernel: #PF: supervisor write access in kernel mode
Jun 25 11:52:38  kernel: #PF: error_code(0x0002) - not-present page
Jun 25 11:52:38  kernel: PGD 0 P4D 0
Jun 25 11:52:38  kernel: Oops: 0002 [#1] PREEMPT SMP PTI
Jun 25 11:52:38  kernel: CPU: 6 PID: 1339 Comm: kvm Tainted: P           O       6.8.4-3-pve #1
Jun 25 11:52:38  kernel: Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./E3C242D4U2-2T, BIOS L2.36A 05/06/2024
Jun 25 11:52:38  kernel: RIP: 0010:blk_flush_complete_seq+0x291/0x2d0
Jun 25 11:52:38  kernel: Code: 0f b6 f6 49 8d 56 01 49 c1 e6 04 4d 01 ee 48 c1 e2 04 49 8b 4e 10 4c 01 ea 48 39 ca 74 2b 48 8b 4b 50 48 8b 7b 48 48 8d 73 48 <48> 89 4f 08 48 89 39 49 8b 4e 18 49 89 76 18 48 89 53 48 48 89 4b
Jun 25 11:52:38  kernel: RSP: 0018:ffffa75b01a139c0 EFLAGS: 00010046
Jun 25 11:52:38  kernel: RAX: 0000000000000000 RBX: ffff8e539b1a0000 RCX: ffff8e539b1a0048
Jun 25 11:52:38  kernel: RDX: ffff8e539260e420 RSI: ffff8e539b1a0048 RDI: 0000000000000000
Jun 25 11:52:38  kernel: RBP: ffffa75b01a13a00 R08: 0000000000000000 R09: 0000000000000000
Jun 25 11:52:38  kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000029801
Jun 25 11:52:38  kernel: R13: ffff8e539260e400 R14: ffff8e539260e410 R15: ffff8e539a32c448
Jun 25 11:52:38  kernel: FS:  0000787fe74006c0(0000) GS:ffff8e5aceb00000(0000) knlGS:0000000000000000
Jun 25 11:52:38  kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 25 11:52:38  kernel: CR2: 0000000000000008 CR3: 0000000139aaa004 CR4: 00000000003726f0
Jun 25 11:52:38  kernel: Call Trace:
Jun 25 11:52:38  kernel:  <TASK>
Jun 25 11:52:38  kernel:  ? show_regs+0x6d/0x80
Jun 25 11:52:38  kernel:  ? __die+0x24/0x80
Jun 25 11:52:38  kernel:  ? page_fault_oops+0x176/0x500
Jun 25 11:52:38  kernel:  ? md_submit_bio+0x63/0xb0
Jun 25 11:52:38  kernel:  ? do_user_addr_fault+0x2f9/0x6b0
Jun 25 11:52:38  kernel:  ? exc_page_fault+0x83/0x1b0
Jun 25 11:52:38  kernel:  ? asm_exc_page_fault+0x27/0x30
Jun 25 11:52:38  kernel:  ? blk_flush_complete_seq+0x291/0x2d0
Jun 25 11:52:38  kernel:  ? __blk_mq_alloc_requests+0x3e7/0x450
Jun 25 11:52:38  kernel:  ? wbt_wait+0x33/0x100
Jun 25 11:52:38  kernel:  blk_insert_flush+0xce/0x220
Jun 25 11:52:38  kernel:  blk_mq_submit_bio+0x641/0x750
Jun 25 11:52:38  kernel:  __submit_bio+0xb3/0x1c0
Jun 25 11:52:38  kernel:  submit_bio_noacct_nocheck+0x2b7/0x390
Jun 25 11:52:38  kernel:  submit_bio_noacct+0x1f3/0x650
Jun 25 11:52:38  kernel:  ? ext4_file_write_iter+0x380/0x7e0
Jun 25 11:52:38  kernel:  submit_bio+0xb2/0x110
Jun 25 11:52:38  kernel:  md_super_write+0xcf/0x110
Jun 25 11:52:38  kernel:  write_sb_page+0x148/0x300
Jun 25 11:52:38  kernel:  filemap_write_page+0x5b/0x70
Jun 25 11:52:38  kernel:  md_bitmap_unplug+0x99/0x200
Jun 25 11:52:38  kernel:  flush_bio_list+0x108/0x110 [raid1]
Jun 25 11:52:38  kernel:  raid1_unplug+0x3c/0xf0 [raid1]
Jun 25 11:52:38  kernel:  __blk_flush_plug+0xbe/0x130
Jun 25 11:52:38  kernel:  blk_finish_plug+0x31/0x50
Jun 25 11:52:38  kernel:  io_submit_sqes+0x549/0x680
Jun 25 11:52:38  kernel:  __do_sys_io_uring_enter+0x57c/0xbf0
Jun 25 11:52:38  kernel:  ? vfs_read+0x255/0x390
Jun 25 11:52:38  kernel:  __x64_sys_io_uring_enter+0x22/0x40
Jun 25 11:52:38  kernel:  x64_sys_call+0x20b9/0x24b0
Jun 25 11:52:38  kernel:  do_syscall_64+0x81/0x170
Jun 25 11:52:38  kernel:  ? ksys_read+0xe6/0x100
Jun 25 11:52:38  kernel:  ? syscall_exit_to_user_mode+0x86/0x260
Jun 25 11:52:38  kernel:  ? do_syscall_64+0x8d/0x170
Jun 25 11:52:38  kernel:  ? do_syscall_64+0x8d/0x170
Jun 25 11:52:38  kernel:  ? do_syscall_64+0x8d/0x170
Jun 25 11:52:38  kernel:  ? common_interrupt+0x54/0xb0
Jun 25 11:52:38  kernel:  entry_SYSCALL_64_after_hwframe+0x78/0x80
Jun 25 11:52:38  kernel: RIP: 0033:0x787ff467cb95
Jun 25 11:52:38  kernel: Code: 00 00 00 44 89 d0 41 b9 08 00 00 00 83 c8 10 f6 87 d0 00 00 00 01 8b bf cc 00 00 00 44 0f 45 d0 45 31 c0 b8 aa 01 00 00 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 41 83 e2 02 74 c2 f0 48 83 0c 24
Jun 25 11:52:38  kernel: RSP: 002b:0000787fe73fafa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
Jun 25 11:52:38  kernel: RAX: ffffffffffffffda RBX: 0000608b718130f0 RCX: 0000787ff467cb95
Jun 25 11:52:38  kernel: RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000000001f
Jun 25 11:52:38  kernel: RBP: 0000608b718130f8 R08: 0000000000000000 R09: 0000000000000008
Jun 25 11:52:38  kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000608b718131e0
Jun 25 11:52:38  kernel: R13: 0000000000000001 R14: 0000608b716ca9b8 R15: 0000000000000000
Jun 25 11:52:38  kernel:  </TASK>
Jun 25 11:52:38  kernel: Modules linked in: veth ebtable_filter ebtables ip6table_raw ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables iptable_raw xt_mac ipt_REJECT nf_reject_ipv4 xt_mark xt_set xt_physdev xt_addrtype xt_comment xt_multiport xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_tcpudp iptable_filter ip_set_hash_net ip_set softdog nf_tables sunrpc binfmt_misc nfnetlink_log bonding nfnetlink tls intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 aesni_intel crypto_simd cryptd ipmi_ssif rapl acpi_ipmi cmdlinepart jc42 spi_nor intel_cstate i2c_algo_bit mei_me wmi_bmof mtd ee1004 ipmi_si 8250_dw ipmi_devintf intel_pmc_core mei intel_pch_thermal ie31200_edac intel_vsec ipmi_msghandler pmt_telemetry acpi_tad pmt_class mac_hid isofs zfs(PO) spl(O) vhost_net vhost vhost_iotlb tap efi_pstore dmi_sysfs
Jun 25 11:52:38  kernel:  ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 raid1 ixgbe xhci_pci nvme xhci_pci_renesas xfrm_algo i2c_i801 nvme_core crc32_pclmul spi_intel_pci intel_lpss_pci ahci dca xhci_hcd spi_intel i2c_smbus intel_lpss mdio libahci idma64 nvme_auth video wmi pinctrl_cannonlake
Jun 25 11:52:38  kernel: CR2: 0000000000000008
Jun 25 11:52:38  kernel: ---[ end trace 0000000000000000 ]---
Jun 25 11:52:38  kernel: RIP: 0010:blk_flush_complete_seq+0x291/0x2d0
Jun 25 11:52:38  kernel: Code: 0f b6 f6 49 8d 56 01 49 c1 e6 04 4d 01 ee 48 c1 e2 04 49 8b 4e 10 4c 01 ea 48 39 ca 74 2b 48 8b 4b 50 48 8b 7b 48 48 8d 73 48 <48> 89 4f 08 48 89 39 49 8b 4e 18 49 89 76 18 48 89 53 48 48 89 4b
Jun 25 11:52:38  kernel: RSP: 0018:ffffa75b01a139c0 EFLAGS: 00010046
Jun 25 11:52:38  kernel: RAX: 0000000000000000 RBX: ffff8e539b1a0000 RCX: ffff8e539b1a0048
Jun 25 11:52:38  kernel: RDX: ffff8e539260e420 RSI: ffff8e539b1a0048 RDI: 0000000000000000
Jun 25 11:52:38  kernel: RBP: ffffa75b01a13a00 R08: 0000000000000000 R09: 0000000000000000
Jun 25 11:52:38  kernel: R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000029801
Jun 25 11:52:38  kernel: R13: ffff8e539260e400 R14: ffff8e539260e410 R15: ffff8e539a32c448
Jun 25 11:52:38  kernel: FS:  0000787fe74006c0(0000) GS:ffff8e5aceb00000(0000) knlGS:0000000000000000
Jun 25 11:52:38  kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 25 11:52:38  kernel: CR2: 0000000000000008 CR3: 0000000139aaa004 CR4: 00000000003726f0
Jun 25 11:52:38  kernel: note: kvm[1339] exited with irqs disabled
Jun 25 11:52:38  kernel: note: kvm[1339] exited with preempt_count 1
Jun 25 11:52:38  kernel: ------------[ cut here ]------------
Jun 25 11:52:38  kernel: WARNING: CPU: 6 PID: 1339 at kernel/exit.c:820 do_exit+0x8dd/0xae0
Jun 25 11:52:38  kernel: Modules linked in: veth ebtable_filter ebtables ip6table_raw ip6t_REJECT nf_reject_ipv6 ip6table_filter ip6_tables iptable_raw xt_mac ipt_REJECT nf_reject_ipv4 xt_mark xt_set xt_physdev xt_addrtype xt_comment xt_multiport xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_tcpudp iptable_filter ip_set_hash_net ip_set softdog nf_tables sunrpc binfmt_misc nfnetlink_log bonding nfnetlink tls intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul polyval_clmulni polyval_generic ghash_clmulni_intel sha256_ssse3 sha1_ssse3 aesni_intel crypto_simd cryptd ipmi_ssif rapl acpi_ipmi cmdlinepart jc42 spi_nor intel_cstate i2c_algo_bit mei_me wmi_bmof mtd ee1004 ipmi_si 8250_dw ipmi_devintf intel_pmc_core mei intel_pch_thermal ie31200_edac intel_vsec ipmi_msghandler pmt_telemetry acpi_tad pmt_class mac_hid isofs zfs(PO) spl(O) vhost_net vhost vhost_iotlb tap efi_pstore dmi_sysfs
Jun 25 11:52:38  kernel:  ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid0 raid1 ixgbe xhci_pci nvme xhci_pci_renesas xfrm_algo i2c_i801 nvme_core crc32_pclmul spi_intel_pci intel_lpss_pci ahci dca xhci_hcd spi_intel i2c_smbus intel_lpss mdio libahci idma64 nvme_auth video wmi pinctrl_cannonlake
Jun 25 11:52:38  kernel: CPU: 6 PID: 1339 Comm: kvm Tainted: P      D    O       6.8.4-3-pve #1
Jun 25 11:52:38  kernel: Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./E3C242D4U2-2T, BIOS L2.36A 05/06/2024
Jun 25 11:52:38  kernel: RIP: 0010:do_exit+0x8dd/0xae0
Jun 25 11:52:38  kernel: Code: e9 42 f8 ff ff 48 8b bb e0 09 00 00 31 f6 e8 9a e0 ff ff e9 ee fd ff ff 4c 89 ee bf 05 06 00 00 e8 08 3a 01 00 e9 6e f8 ff ff <0f> 0b e9 9c f7 ff ff 0f 0b e9 55 f7 ff ff 48 89 df e8 0d 2f 14 00
Jun 25 11:52:38  kernel: RSP: 0018:ffffa75b01a13ec8 EFLAGS: 00010282
Jun 25 11:52:38  kernel: RAX: 0000000000000000 RBX: ffff8e539cafa940 RCX: 0000000000000000
Jun 25 11:52:38  kernel: RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
Jun 25 11:52:38  kernel: RBP: ffffa75b01a13f20 R08: 0000000000000000 R09: 0000000000000000
Jun 25 11:52:38  kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff8e539a068d80
Jun 25 11:52:38  kernel: R13: 0000000000000009 R14: ffff8e539a063180 R15: 0000000000000000
Jun 25 11:52:38  kernel: FS:  0000787fe74006c0(0000) GS:ffff8e5aceb00000(0000) knlGS:0000000000000000
Jun 25 11:52:38  kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jun 25 11:52:38  kernel: CR2: 0000000000000008 CR3: 0000000139aaa004 CR4: 00000000003726f0
Jun 25 11:52:38  kernel: Call Trace:
Jun 25 11:52:38  kernel:  <TASK>
Jun 25 11:52:38  kernel:  ? show_regs+0x6d/0x80
Jun 25 11:52:38  kernel:  ? __warn+0x89/0x160
Jun 25 11:52:38  kernel:  ? do_exit+0x8dd/0xae0
Jun 25 11:52:38  kernel:  ? report_bug+0x17e/0x1b0
Jun 25 11:52:38  kernel:  ? handle_bug+0x46/0x90
Jun 25 11:52:38  kernel:  ? exc_invalid_op+0x18/0x80
Jun 25 11:52:38  kernel:  ? asm_exc_invalid_op+0x1b/0x20
Jun 25 11:52:38  kernel:  ? do_exit+0x8dd/0xae0
Jun 25 11:52:38  kernel:  ? do_exit+0x72/0xae0
Jun 25 11:52:38  kernel:  ? _printk+0x60/0x90
Jun 25 11:52:38  kernel:  make_task_dead+0x83/0x170
Jun 25 11:52:38  kernel:  rewind_stack_and_make_dead+0x17/0x20
Jun 25 11:52:38  kernel: RIP: 0033:0x787ff467cb95
Jun 25 11:52:38  kernel: Code: 00 00 00 44 89 d0 41 b9 08 00 00 00 83 c8 10 f6 87 d0 00 00 00 01 8b bf cc 00 00 00 44 0f 45 d0 45 31 c0 b8 aa 01 00 00 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 41 83 e2 02 74 c2 f0 48 83 0c 24
Jun 25 11:52:38  kernel: RSP: 002b:0000787fe73fafa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
Jun 25 11:52:38  kernel: RAX: ffffffffffffffda RBX: 0000608b718130f0 RCX: 0000787ff467cb95
Jun 25 11:52:38  kernel: RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000000001f
Jun 25 11:52:38  kernel: RBP: 0000608b718130f8 R08: 0000000000000000 R09: 0000000000000008
Jun 25 11:52:38  kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000608b718131e0
Jun 25 11:52:38  kernel: R13: 0000000000000001 R14: 0000608b716ca9b8 R15: 0000000000000000
Jun 25 11:52:38  kernel:  </TASK>
Jun 25 11:52:38  kernel: ---[ end trace 0000000000000000 ]---

leesteken · Jun 25, 2024

Probably the same issue as this: https://forum.proxmox.com/threads/b...-address-0000000000000000.102741/#post-442398
Can you try the same work-around of booting kernel version 6.5 instead of 6.8?

ctrlshifti · Jun 25, 2024

leesteken said:
Probably the same issue as this: https://forum.proxmox.com/threads/b...-address-0000000000000000.102741/#post-442398
Can you try the same work-around of booting kernel version 6.5 instead of 6.8?

I done it by:

Code:

sudo apt install proxmox-kernel-6.5.13-5-pve-signed
sudo apt install proxmox-headers-6.5.13-5-pve

sudo proxmox-boot-tool kernel pin 6.5.13-5-pve

I'll let you know if error still occurs.

fweber · Jun 25, 2024

Hi, this particular NULL pointer dereference error with RIP pointing to blk_flush_complete_seq ...

ctrlshifti said:

... should be fixed in proxmox-kernel-6.8.8-1-pve and higher, see [1] for more information.

According to the pveversion -v, the node has been running kernel 6.8.8-1 at the time you ran pveversion -v, but according to the crash message, at the time of the crash the node was still running an older affected kernel 6.8.4-3-pve:

ctrlshifti said:

So can you please try kernel 6.8.8-1 instead? If you see any crashes, please let me know and attach the crash information too.

[1] https://forum.proxmox.com/threads/random-6-8-4-2-pve-kernel-crashes.145760/page-8#post-674842
[2] https://forum.proxmox.com/threads/b...-address-0000000000000000.102741/#post-442398

ctrlshifti · Jun 25, 2024

fweber said:
Hi, this particular NULL pointer dereference error with RIP pointing to blk_flush_complete_seq ...

... should be fixed in proxmox-kernel-6.8.8-1-pve and higher, see [1] for more information.

According to the pveversion -v, the node has been running kernel 6.8.8-1 at the time you ran pveversion -v, but according to the crash message, at the time of the crash the node was still running an older affected kernel 6.8.4-3-pve:

So can you please try kernel 6.8.8-1 instead? If you see any crashes, please let me know and attach the crash information too.

[1] https://forum.proxmox.com/threads/random-6-8-4-2-pve-kernel-crashes.145760/page-8#post-674842
[2] https://forum.proxmox.com/threads/b...-address-0000000000000000.102741/#post-442398

You're correct. After the crash, I performed an apt upgrade which might have led to a newer kernel in pveversion. However, I have reverted back to version 6.8.8-1. I'll inform you if the error occurs again.

ctrlshifti · Jul 13, 2024

fweber said:
Hi, this particular NULL pointer dereference error with RIP pointing to blk_flush_complete_seq ...

... should be fixed in proxmox-kernel-6.8.8-1-pve and higher, see [1] for more information.

According to the pveversion -v, the node has been running kernel 6.8.8-1 at the time you ran pveversion -v, but according to the crash message, at the time of the crash the node was still running an older affected kernel 6.8.4-3-pve:

So can you please try kernel 6.8.8-1 instead? If you see any crashes, please let me know and attach the crash information too.

[1] https://forum.proxmox.com/threads/random-6-8-4-2-pve-kernel-crashes.145760/page-8#post-674842
[2] https://forum.proxmox.com/threads/b...-address-0000000000000000.102741/#post-442398

ctrlshifti said:
You're correct. After the crash, I performed an apt upgrade which might have led to a newer kernel in pveversion. However, I have reverted back to version 6.8.8-1. I'll inform you if the error occurs again.

It's been 18 days and everything's running smoothly now. The last time I encountered this error was happening every 3 days. But now, the problem is solved. Thanks.

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BUG: kernel NULL pointer dereference, address: 0000000000000008

ctrlshifti

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leesteken

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ctrlshifti

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fweber

Proxmox Staff Member

ctrlshifti

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ctrlshifti

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