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    #1

    Taskbar and Desktop freezing

    Hello everyone,
    I am using Kubuntu 22.04.2 LTS and receive since a week or two random freezes after 15 min, sometimes after hours. Maybe this is linked to a recent update? During these freezes I am unable to interact with the task bar or my desktop at all. Sometimes the whole system freezes, so I can't event move my mouse cursor. The only way to regain control is killing plasma and restarting it. This isn't the case if everything is stuck, since only a hard reboot enables me to regain control. I am currently using Plasma X11. In the following, I posted the output of journalctl which appeared at the moment of the crash.
    I hope someone may have a solution, since I am in need of a properly working workstation.
    I am greatful for every ideas to fix the problem!

    Code:
    Jul 06 12:17:16 PC-Johannes kernel: BUG: kernel NULL pointer dereference, address: 0000000000000008
Jul 06 12:17:16 PC-Johannes kernel: #PF: supervisor read access in kernel mode
Jul 06 12:17:16 PC-Johannes kernel: #PF: error_code(0x0000) - not-present page
Jul 06 12:17:16 PC-Johannes kernel: PGD 0 P4D 0
Jul 06 12:17:16 PC-Johannes kernel: Oops: 0000 [#1] SMP NOPTI
Jul 06 12:17:16 PC-Johannes kernel: CPU: 6 PID: 1801 Comm: plasmashell Tainted: G OE 5.15.0-76-generic #83-Ubuntu
Jul 06 12:17:16 PC-Johannes kernel: Hardware name: Micro-Star International Co., Ltd MS-7A34/B350 PC MATE (MS-7A34), BIOS A.60 07/27/2017
Jul 06 12:17:16 PC-Johannes kernel: RIP: 0010:gp100_vmm_pgt_mem+0xdb/0x1a0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: Code: ff 49 89 46 30 8b 45 c4 41 89 c5 8d 44 02 01 89 45 d0 41 0f b7 57 12 49 8b 7f 08 46 8d 24 ea 48 8b 57 08 41 83 c5 01 4c 89 e6 <48> 8b 4a 08 89 da e8 4a 39 01 fb 49
8b 7f 08 48 89 d8 49 8d 74 24
Jul 06 12:17:16 PC-Johannes kernel: RSP: 0018:ffff9d8b82dbf5c8 EFLAGS: 00010202
Jul 06 12:17:16 PC-Johannes kernel: RAX: 000000000000001c RBX: 1100000000669001 RCX: 0000000000000010
Jul 06 12:17:16 PC-Johannes kernel: RDX: 0000000000000000 RSI: 00000000000009a0 RDI: ffff888588537780
Jul 06 12:17:16 PC-Johannes kernel: RBP: ffff9d8b82dbf608 R08: ffff9d8b82dbf7e8 R09: 0000000000000014
Jul 06 12:17:16 PC-Johannes kernel: R10: 0000000000000000 R11: 1100000000000000 R12: 00000000000009a0
Jul 06 12:17:16 PC-Johannes kernel: R13: 0000000000000015 R14: ffff9d8b82dbf7e8 R15: ffff88858b769440
Jul 06 12:17:16 PC-Johannes kernel: FS: 00007fb8861c69c0(0000) GS:ffff88888ef80000(0000) knlGS:0000000000000000
Jul 06 12:17:16 PC-Johannes kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 06 12:17:16 PC-Johannes kernel: CR2: 0000000000000008 CR3: 00000001199d0000 CR4: 00000000003506e0
Jul 06 12:17:16 PC-Johannes kernel: Call Trace:
Jul 06 12:17:16 PC-Johannes kernel: <TASK>
Jul 06 12:17:16 PC-Johannes kernel: nvkm_vmm_iter.constprop.0+0x31c/0x730 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? gp100_vmm_pgt_sgl+0x1a0/0x1a0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? gp100_vmm_pgt_sgl+0x1a0/0x1a0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nvkm_vmm_ref_sptes+0x1e0/0x1e0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nvkm_ltc_dtor+0x30/0x30 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_vmm_ptes_get_map+0x31/0xa0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nvkm_vmm_ref_sptes+0x1e0/0x1e0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? gp100_vmm_pgt_sgl+0x1a0/0x1a0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_vmm_map_locked+0x1c1/0x330 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_vmm_map+0x49/0x70 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_vram_map+0x58/0x80 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_uvmm_mthd_map.isra.0+0x1ad/0x250 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_uvmm_mthd+0x54/0x410 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_object_mthd+0x1a/0x30 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_ioctl_mthd+0x65/0x80 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_ioctl+0xf6/0x1c0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvkm_client_ioctl+0xe/0x20 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvif_object_mthd+0x172/0x210 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nvkm_client_ioctl+0xe/0x20 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nvif_object_mthd+0x187/0x210 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nvif_vmm_map+0x116/0x130 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nouveau_mem_map+0x7d/0xe0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nouveau_vma_new+0x1bd/0x1e0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nouveau_gem_object_open+0xd3/0x150 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: drm_gem_handle_create_tail+0xce/0x180 [drm]
Jul 06 12:17:16 PC-Johannes kernel: drm_gem_handle_create+0x36/0x50 [drm]
Jul 06 12:17:16 PC-Johannes kernel: nouveau_gem_ioctl_new+0x9f/0x110 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: ? nouveau_gem_new+0xe0/0xe0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: drm_ioctl_kernel+0xb3/0x100 [drm]
Jul 06 12:17:16 PC-Johannes kernel: drm_ioctl+0x268/0x4b0 [drm]
Jul 06 12:17:16 PC-Johannes kernel: ? nouveau_gem_new+0xe0/0xe0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: nouveau_drm_ioctl+0x66/0xc0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: __x64_sys_ioctl+0x95/0xd0
Jul 06 12:17:16 PC-Johannes kernel: do_syscall_64+0x5c/0xc0
Jul 06 12:17:16 PC-Johannes kernel: ? do_syscall_64+0x69/0xc0
Jul 06 12:17:16 PC-Johannes kernel: ? fput+0x13/0x20
Jul 06 12:17:16 PC-Johannes kernel: ? filp_close+0x60/0x70
Jul 06 12:17:16 PC-Johannes kernel: ? exit_to_user_mode_prepare+0x37/0xb0
Jul 06 12:17:16 PC-Johannes kernel: ? syscall_exit_to_user_mode+0x27/0x50
Jul 06 12:17:16 PC-Johannes kernel: ? __x64_sys_close+0x11/0x50
Jul 06 12:17:16 PC-Johannes kernel: ? do_syscall_64+0x69/0xc0
Jul 06 12:17:16 PC-Johannes kernel: ? exc_page_fault+0x89/0x170
Jul 06 12:17:16 PC-Johannes kernel: entry_SYSCALL_64_after_hwframe+0x61/0xcb
Jul 06 12:17:16 PC-Johannes kernel: RIP: 0033:0x7fb88a615aff
Jul 06 12:17:16 PC-Johannes kernel: Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <41> 89 c0 3d 00 f0 ff ff 77 1f 48 8b
44 24 18 64 48 2b 04 25 28 00
Jul 06 12:17:16 PC-Johannes kernel: RSP: 002b:00007ffe9789e770 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Jul 06 12:17:16 PC-Johannes kernel: RAX: ffffffffffffffda RBX: 00007ffe9789e820 RCX: 00007fb88a615aff
Jul 06 12:17:16 PC-Johannes kernel: RDX: 00007ffe9789e820 RSI: 00000000c0306480 RDI: 000000000000000d
Jul 06 12:17:16 PC-Johannes kernel: RBP: 00000000c0306480 R08: 000056240dd2e010 R09: 000056240fd81530
Jul 06 12:17:16 PC-Johannes kernel: R10: 0000000000000007 R11: 0000000000000246 R12: 000056240de916d0
Jul 06 12:17:16 PC-Johannes kernel: R13: 000000000000000d R14: 00007ffe9789e820 R15: 0000000000078000
Jul 06 12:17:16 PC-Johannes kernel: </TASK>
Jul 06 12:17:16 PC-Johannes kernel: Modules linked in: rfcomm ccm vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) cmac algif_hash algif_skcipher af_alg bnep binfmt_misc snd_hda_codec_realtek snd_hda_codec_generic
ledtrig_audio snd_hda_codec_hdmi nls_iso8859_1 iwlmvm snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec snd_hda_core mac80211 snd_hwdep intel_rapl_msr snd_pcm intel_rapl_common libarc4 snd_se
q_midi snd_seq_midi_event snd_rawmidi btusb edac_mce_amd snd_seq btrtl btbcm btintel snd_seq_device kvm_amd iwlwifi snd_timer bluetooth kvm snd ecdh_generic rapl input_leds joydev ecc wmi_bmof cfg80211 k10t
emp soundcore ccp sch_fq_codel mac_hid msr parport_pc ppdev lp parport ramoops pstore_blk reed_solomon pstore_zone efi_pstore ip_tables x_tables autofs4 dm_crypt hid_generic nouveau mxm_wmi i2c_algo_bit drm
_ttm_helper ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core usbhid hid drm crct10dif_pclmul crc32_pclmul video ghash_clmulni_intel aesni_intel r8169 crypto_simd ahci
Jul 06 12:17:16 PC-Johannes kernel: gpio_amdpt xhci_pci cryptd i2c_piix4 realtek libahci xhci_pci_renesas wmi gpio_generic
Jul 06 12:17:16 PC-Johannes kernel: CR2: 0000000000000008
Jul 06 12:17:16 PC-Johannes kernel: ---[ end trace 4eb547401056e8d8 ]---
Jul 06 12:17:16 PC-Johannes kernel: RIP: 0010:gp100_vmm_pgt_mem+0xdb/0x1a0 [nouveau]
Jul 06 12:17:16 PC-Johannes kernel: Code: ff 49 89 46 30 8b 45 c4 41 89 c5 8d 44 02 01 89 45 d0 41 0f b7 57 12 49 8b 7f 08 46 8d 24 ea 48 8b 57 08 41 83 c5 01 4c 89 e6 <48> 8b 4a 08 89 da e8 4a 39 01 fb 49
8b 7f 08 48 89 d8 49 8d 74 24
Jul 06 12:17:16 PC-Johannes kernel: RSP: 0018:ffff9d8b82dbf5c8 EFLAGS: 00010202
Jul 06 12:17:16 PC-Johannes kernel: RAX: 000000000000001c RBX: 1100000000669001 RCX: 0000000000000010
Jul 06 12:17:16 PC-Johannes kernel: RDX: 0000000000000000 RSI: 00000000000009a0 RDI: ffff888588537780
Jul 06 12:17:16 PC-Johannes kernel: RBP: ffff9d8b82dbf608 R08: ffff9d8b82dbf7e8 R09: 0000000000000014
Jul 06 12:17:16 PC-Johannes kernel: R10: 0000000000000000 R11: 1100000000000000 R12: 00000000000009a0
Jul 06 12:17:16 PC-Johannes kernel: R13: 0000000000000015 R14: ffff9d8b82dbf7e8 R15: ffff88858b769440
Jul 06 12:17:16 PC-Johannes kernel: FS: 00007fb8861c69c0(0000) GS:ffff88888ef80000(0000) knlGS:0000000000000000
Jul 06 12:17:16 PC-Johannes kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jul 06 12:17:16 PC-Johannes kernel: CR2: 0000000000000008 CR3: 00000001199d0000 CR4: 00000000003506e0
​
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    #2
    Have you tried an earlier kernel to see if it's a kernel issue?

    Please Read Me
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      #3
      Originally posted by oshunluvr View Post
      Have you tried an earlier kernel to see if it's a kernel issue?
      Thanks for the suggestion. This seems to work. I haven't even thought about this. I've tested everything using the kernel 5.15.0-75-generic for the last few days and haven't encountered a problem yet.
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        #4
        You could also give the 5.19.x kernel (which is automatically installed if you use the Kubuntu 22.04.2 installation ISO or later) a try with:
        sudo apt install --install-recommends linux-generic-hwe-22.04

        You can remove it and/or go back to the 5.15.0-75-generic kernel again, if it does not work.

        PS: I think you have an Nvidia graphics card and don't seem to use the proprietary Nvidia driver from the *Ubuntu repositories but the nouveau driver.
        Is this on purpose or am I wrong?
        Last edited by Schwarzer Kater; Jul 11, 2023, 03:46 PM. Reason: added PS
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          #5
          Thanks, I'll give it a try and report back! I am indeed using the nouveau driver since I had problems with the proprietary one in the past (around a year ago).
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