Public bug reported:
"ubuntu-bug linux" was collecting the wrong information, therefore this
bug report.
While using slack, code, firefox, draw.io, I got weird behavior in Xorg
on programs reacting on user input or not. Unfortunately Xorg is still
needed for full functionality of slack (windows/screens sharing).
Gnome did not react anymore trying to either quit applications by
clicking [x] with the mouse or switching them with Alt+Tab or anything
else. After switching shells (Ctrl+Alt+F1 , Ctrl+Alt+F2 etc.), it
started working again, but I saw kernel taints and rebooted then.
It seems it was a use-after-free problem with amdgpu together with Xorg,
cut out part here. In the entire kernel.log (attached) you will also
find an earlier warning (not tainted) that seems to be related to
amdgpu.
[270789.156613] ------------[ cut here ]------------
[270789.156620] refcount_t: underflow; use-after-free.
[270789.156633] WARNING: CPU: 3 PID: 5274 at lib/refcount.c:28
refcount_warn_saturate+0xfb/0x150
[270789.156643] Modules linked in: mptcp_diag xsk_diag tcp_diag udp_diag
raw_diag inet_diag unix_diag af_packet_diag netlink_diag rfcomm snd_seq_dummy
snd_hrtimer xt_conntrack xt_MASQUERADE bridge stp llc xt_set ip_set
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_addrtype
nft_compat nf_tables xfrm_user xfrm_algo wireguard curve25519_x86_64
libchacha20poly1305 chacha_x86_64 poly1305_x86_64 libcurve25519_generic
libchacha vxlan ip6_udp_tunnel udp_tunnel ccm michael_mic snd_usb_audio
snd_usbmidi_lib snd_ump snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi
snd_seq_device overlay cmac algif_hash algif_skcipher af_alg bnep binfmt_misc
nls_iso8859_1 qrtr_mhi amdgpu snd_soc_dmic snd_ps_pdm_dma snd_soc_ps_mach
snd_sof_amd_acp70 snd_sof_amd_acp63 snd_sof_amd_vangogh snd_sof_amd_rembrandt
snd_sof_amd_renoir snd_sof_amd_acp snd_sof_pci snd_sof_xtensa_dsp snd_sof
snd_sof_utils snd_pci_ps intel_rapl_msr amd_atl snd_soc_acpi_amd_match
intel_rapl_common snd_hda_codec_realtek snd_amd_sdw_acpi qrtr soundwire_amd
[270789.156738] snd_hda_codec_generic soundwire_generic_allocation
snd_hda_scodec_component ath11k_pci soundwire_bus snd_hda_codec_hdmi
snd_soc_sdca btusb ath11k amdxcp edac_mce_amd btrtl uvcvideo
drm_panel_backlight_quirks snd_hda_intel btintel snd_soc_core qmi_helpers btbcm
drm_buddy videobuf2_vmalloc snd_intel_dspcfg kvm_amd snd_compress uvc ac97_bus
drm_ttm_helper videobuf2_memops snd_intel_sdw_acpi btmtk mac80211
snd_pcm_dmaengine ttm snd_rpl_pci_acp6x kvm videobuf2_v4l2 snd_acp_pci spd5118
drm_exec snd_hda_codec snd_acp_legacy_common videobuf2_common snd_pci_acp6x
drm_suballoc_helper snd_ctl_led bluetooth irqbypass snd_hda_core videodev
snd_pci_acp5x rapl cfg80211 drm_display_helper snd_hwdep snd_rn_pci_acp3x mc
think_lmi cec snd_pcm snd_acp_config libarc4 rc_core snd_soc_acpi amdxdna
i2c_piix4 mhi wmi_bmof thinkpad_acpi firmware_attributes_class i2c_algo_bit
snd_timer snd_pci_acp3x gpu_sched ccp k10temp i2c_smbus nvram amd_pmc
input_leds joydev mac_hid serio_raw sch_fq_codel msr parport_pc ppdev lp parport
[270789.156840] nvme_fabrics nvme_keyring efi_pstore nfnetlink dmi_sysfs
ip_tables x_tables autofs4 btrfs blake2b_generic cdc_ether usbnet r8152 mii
dm_crypt usbhid raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq raid1 raid0 linear polyval_clmulni
hid_multitouch polyval_generic snd ghash_clmulni_intel hid_generic nvme
soundcore sha256_ssse3 ucsi_acpi nvme_core sha1_ssse3 r8169 i2c_hid_acpi
typec_ucsi video psmouse thunderbolt sparse_keymap nvme_auth i2c_hid realtek
typec platform_profile wmi hid aesni_intel crypto_simd cryptd
[270789.156908] CPU: 3 UID: 1000 PID: 5274 Comm: Xorg Tainted: G W
6.14.0-35-generic #35~24.04.1-Ubuntu
[270789.156911] Tainted: [W]=WARN
[270789.156912] Hardware name: LENOVO 21K5CTO1WW/21K5CTO1WW, BIOS R2FET61W
(1.41 ) 11/15/2024
[270789.156915] RIP: 0010:refcount_warn_saturate+0xfb/0x150
[270789.156918] Code: eb 9a 0f b6 1d 28 b8 ed 01 80 fb 01 0f 87 2d 68 6f ff 83
e3 01 75 85 48 c7 c7 40 80 04 91 c6 05 0c b8 ed 01 01 e8 65 a5 84 ff <0f> 0b e9
6b ff ff ff 0f b6 1d fa b7 ed 01 80 fb 01 0f 87 ea 67 6f
[270789.156919] RSP: 0018:ffffcee84351f820 EFLAGS: 00010246
[270789.156922] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000000
[270789.156924] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[270789.156925] RBP: ffffcee84351f828 R08: 0000000000000000 R09:
0000000000000000
[270789.156926] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000000
[270789.156927] R13: ffff8d5ead600000 R14: 0000000000000000 R15:
ffff8d5ead600000
[270789.156928] FS: 00007134b1218ac0(0000) GS:ffff8d65a5b80000(0000)
knlGS:0000000000000000
[270789.156930] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[270789.156931] CR2: 00001b8d1b271000 CR3: 00000001381db000 CR4:
0000000000f50ef0
[270789.156933] PKRU: 55555554
[270789.156934] Call Trace:
[270789.156937] <TASK>
[270789.156948] dc_stream_release+0x74/0x80 [amdgpu]
[270789.157382] dc_state_destruct+0xb9/0x3f0 [amdgpu]
[270789.157612] dc_state_release.part.0+0x38/0xa0 [amdgpu]
[270789.157846] dc_state_release+0x13/0x30 [amdgpu]
[270789.158058] dm_atomic_destroy_state+0x20/0x40 [amdgpu]
[270789.158230] drm_atomic_state_default_clear+0x241/0x300
[270789.158242] __drm_atomic_state_free+0x88/0xe0
[270789.158245] drm_atomic_helper_set_config+0x8f/0xd0
[270789.158251] drm_mode_setcrtc+0x3f7/0x9c0
[270789.158256] ? __pfx_drm_connector_property_set_ioctl+0x10/0x10
[270789.158261] ? __pfx_drm_mode_setcrtc+0x10/0x10
[270789.158263] drm_ioctl_kernel+0xb6/0x120
[270789.158268] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158274] drm_ioctl+0x2f3/0x5b0
[270789.158276] ? __pfx_drm_mode_setcrtc+0x10/0x10
[270789.158281] amdgpu_drm_ioctl+0x4b/0x90 [amdgpu]
[270789.158421] __x64_sys_ioctl+0xa4/0xe0
[270789.158429] x64_sys_call+0x131e/0x2650
[270789.158435] do_syscall_64+0x7e/0x170
[270789.158444] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158446] ? drm_mode_addfb_ioctl+0xe/0x20
[270789.158449] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158451] ? drm_ioctl_kernel+0xb6/0x120
[270789.158454] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158456] ? __check_object_size.part.0+0x3a/0x150
[270789.158462] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158464] ? __check_object_size+0x23/0x30
[270789.158467] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158469] ? drm_ioctl+0x323/0x5b0
[270789.158472] ? __pfx_drm_mode_addfb_ioctl+0x10/0x10
[270789.158477] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158479] ? __pm_runtime_suspend+0x7b/0xd0
[270789.158486] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158487] ? amdgpu_drm_ioctl+0x6d/0x90 [amdgpu]
[270789.158722] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158724] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158726] ? arch_exit_to_user_mode_prepare.isra.0+0x22/0x120
[270789.158733] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158735] ? syscall_exit_to_user_mode+0x38/0x1d0
[270789.158740] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158742] ? do_syscall_64+0x8a/0x170
[270789.158745] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158747] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158749] ? ksys_write+0x9d/0xf0
[270789.158755] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158757] ? arch_exit_to_user_mode_prepare.isra.0+0x22/0x120
[270789.158759] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158761] ? syscall_exit_to_user_mode+0x38/0x1d0
[270789.158764] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158766] ? do_syscall_64+0x8a/0x170
[270789.158769] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[270789.158774] RIP: 0033:0x7134b1124e1d
[270789.158777] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0
10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d
00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[270789.158779] RSP: 002b:00007ffec10b3830 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[270789.158782] RAX: ffffffffffffffda RBX: 000055f4de875b40 RCX:
00007134b1124e1d
[270789.158784] RDX: 00007ffec10b38c0 RSI: 00000000c06864a2 RDI:
000000000000000e
[270789.158786] RBP: 00007ffec10b3880 R08: 0000000000000000 R09:
000055f4de07ccf0
[270789.158787] R10: 0000000000000000 R11: 0000000000000246 R12:
00007ffec10b38c0
[270789.158789] R13: 00000000c06864a2 R14: 000000000000000e R15:
000055f4de07ccf0
[270789.158795] </TASK>
[270789.158797] ---[ end trace 0000000000000000 ]---
$ cat /proc/version_signature
Ubuntu 6.14.0-35.35~24.04.1-generic 6.14.11
$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
Release: 24.04
Kernel log from that entire boot is attached (spanning several days
including suspend/resumes in between).
Will also attach lspci -vnvn log after.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amdgpu
** Attachment added: "kernel.log"
https://bugs.launchpad.net/bugs/2132008/+attachment/5927932/+files/kernel.log
** Description changed:
"ubuntu-bug linux" was collecting the wrong information, therefore this
bug report.
While using slack, code, firefox, draw.io, I got weird behavior in Xorg
on programs reacting on user input or not. Unfortunately Xorg is still
needed for full functionality of slack (windows/screens sharing).
Gnome did not react anymore trying to either quit applications by
clicking [x] with the mouse or switching them with Alt+Tab or anything
else. After switching shells (Ctrl+Alt+F1 , Ctrl+Alt+F2 etc.), it
started working again, but I saw kernel taints and rebooted then.
It seems it was a use-after-free problem with amdgpu together with Xorg,
cut out part here. In the entire kernel.log (attached) you will also
find an earlier warning (not tainted) that seems to be related to
amdgpu.
[270789.156613] ------------[ cut here ]------------
[270789.156620] refcount_t: underflow; use-after-free.
[270789.156633] WARNING: CPU: 3 PID: 5274 at lib/refcount.c:28
refcount_warn_saturate+0xfb/0x150
[270789.156643] Modules linked in: mptcp_diag xsk_diag tcp_diag udp_diag
raw_diag inet_diag unix_diag af_packet_diag netlink_diag rfcomm snd_seq_dummy
snd_hrtimer xt_conntrack xt_MASQUERADE bridge stp llc xt_set ip_set
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_addrtype
nft_compat nf_tables xfrm_user xfrm_algo wireguard curve25519_x86_64
libchacha20poly1305 chacha_x86_64 poly1305_x86_64 libcurve25519_generic
libchacha vxlan ip6_udp_tunnel udp_tunnel ccm michael_mic snd_usb_audio
snd_usbmidi_lib snd_ump snd_seq_midi snd_seq_midi_event snd_seq snd_rawmidi
snd_seq_device overlay cmac algif_hash algif_skcipher af_alg bnep binfmt_misc
nls_iso8859_1 qrtr_mhi amdgpu snd_soc_dmic snd_ps_pdm_dma snd_soc_ps_mach
snd_sof_amd_acp70 snd_sof_amd_acp63 snd_sof_amd_vangogh snd_sof_amd_rembrandt
snd_sof_amd_renoir snd_sof_amd_acp snd_sof_pci snd_sof_xtensa_dsp snd_sof
snd_sof_utils snd_pci_ps intel_rapl_msr amd_atl snd_soc_acpi_amd_match
intel_rapl_common snd_hda_codec_realtek snd_amd_sdw_acpi qrtr soundwire_amd
[270789.156738] snd_hda_codec_generic soundwire_generic_allocation
snd_hda_scodec_component ath11k_pci soundwire_bus snd_hda_codec_hdmi
snd_soc_sdca btusb ath11k amdxcp edac_mce_amd btrtl uvcvideo
drm_panel_backlight_quirks snd_hda_intel btintel snd_soc_core qmi_helpers btbcm
drm_buddy videobuf2_vmalloc snd_intel_dspcfg kvm_amd snd_compress uvc ac97_bus
drm_ttm_helper videobuf2_memops snd_intel_sdw_acpi btmtk mac80211
snd_pcm_dmaengine ttm snd_rpl_pci_acp6x kvm videobuf2_v4l2 snd_acp_pci spd5118
drm_exec snd_hda_codec snd_acp_legacy_common videobuf2_common snd_pci_acp6x
drm_suballoc_helper snd_ctl_led bluetooth irqbypass snd_hda_core videodev
snd_pci_acp5x rapl cfg80211 drm_display_helper snd_hwdep snd_rn_pci_acp3x mc
think_lmi cec snd_pcm snd_acp_config libarc4 rc_core snd_soc_acpi amdxdna
i2c_piix4 mhi wmi_bmof thinkpad_acpi firmware_attributes_class i2c_algo_bit
snd_timer snd_pci_acp3x gpu_sched ccp k10temp i2c_smbus nvram amd_pmc
input_leds joydev mac_hid serio_raw sch_fq_codel msr parport_pc ppdev lp parport
[270789.156840] nvme_fabrics nvme_keyring efi_pstore nfnetlink dmi_sysfs
ip_tables x_tables autofs4 btrfs blake2b_generic cdc_ether usbnet r8152 mii
dm_crypt usbhid raid10 raid456 async_raid6_recov async_memcpy async_pq
async_xor async_tx xor raid6_pq raid1 raid0 linear polyval_clmulni
hid_multitouch polyval_generic snd ghash_clmulni_intel hid_generic nvme
soundcore sha256_ssse3 ucsi_acpi nvme_core sha1_ssse3 r8169 i2c_hid_acpi
typec_ucsi video psmouse thunderbolt sparse_keymap nvme_auth i2c_hid realtek
typec platform_profile wmi hid aesni_intel crypto_simd cryptd
[270789.156908] CPU: 3 UID: 1000 PID: 5274 Comm: Xorg Tainted: G W
6.14.0-35-generic #35~24.04.1-Ubuntu
[270789.156911] Tainted: [W]=WARN
[270789.156912] Hardware name: LENOVO 21K5CTO1WW/21K5CTO1WW, BIOS R2FET61W
(1.41 ) 11/15/2024
[270789.156915] RIP: 0010:refcount_warn_saturate+0xfb/0x150
[270789.156918] Code: eb 9a 0f b6 1d 28 b8 ed 01 80 fb 01 0f 87 2d 68 6f ff
83 e3 01 75 85 48 c7 c7 40 80 04 91 c6 05 0c b8 ed 01 01 e8 65 a5 84 ff <0f> 0b
e9 6b ff ff ff 0f b6 1d fa b7 ed 01 80 fb 01 0f 87 ea 67 6f
[270789.156919] RSP: 0018:ffffcee84351f820 EFLAGS: 00010246
[270789.156922] RAX: 0000000000000000 RBX: 0000000000000000 RCX:
0000000000000000
[270789.156924] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[270789.156925] RBP: ffffcee84351f828 R08: 0000000000000000 R09:
0000000000000000
[270789.156926] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000000
[270789.156927] R13: ffff8d5ead600000 R14: 0000000000000000 R15:
ffff8d5ead600000
[270789.156928] FS: 00007134b1218ac0(0000) GS:ffff8d65a5b80000(0000)
knlGS:0000000000000000
[270789.156930] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[270789.156931] CR2: 00001b8d1b271000 CR3: 00000001381db000 CR4:
0000000000f50ef0
[270789.156933] PKRU: 55555554
[270789.156934] Call Trace:
[270789.156937] <TASK>
[270789.156948] dc_stream_release+0x74/0x80 [amdgpu]
[270789.157382] dc_state_destruct+0xb9/0x3f0 [amdgpu]
[270789.157612] dc_state_release.part.0+0x38/0xa0 [amdgpu]
[270789.157846] dc_state_release+0x13/0x30 [amdgpu]
[270789.158058] dm_atomic_destroy_state+0x20/0x40 [amdgpu]
[270789.158230] drm_atomic_state_default_clear+0x241/0x300
[270789.158242] __drm_atomic_state_free+0x88/0xe0
[270789.158245] drm_atomic_helper_set_config+0x8f/0xd0
[270789.158251] drm_mode_setcrtc+0x3f7/0x9c0
[270789.158256] ? __pfx_drm_connector_property_set_ioctl+0x10/0x10
[270789.158261] ? __pfx_drm_mode_setcrtc+0x10/0x10
[270789.158263] drm_ioctl_kernel+0xb6/0x120
[270789.158268] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158274] drm_ioctl+0x2f3/0x5b0
[270789.158276] ? __pfx_drm_mode_setcrtc+0x10/0x10
[270789.158281] amdgpu_drm_ioctl+0x4b/0x90 [amdgpu]
[270789.158421] __x64_sys_ioctl+0xa4/0xe0
[270789.158429] x64_sys_call+0x131e/0x2650
[270789.158435] do_syscall_64+0x7e/0x170
[270789.158444] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158446] ? drm_mode_addfb_ioctl+0xe/0x20
[270789.158449] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158451] ? drm_ioctl_kernel+0xb6/0x120
[270789.158454] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158456] ? __check_object_size.part.0+0x3a/0x150
[270789.158462] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158464] ? __check_object_size+0x23/0x30
[270789.158467] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158469] ? drm_ioctl+0x323/0x5b0
[270789.158472] ? __pfx_drm_mode_addfb_ioctl+0x10/0x10
[270789.158477] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158479] ? __pm_runtime_suspend+0x7b/0xd0
[270789.158486] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158487] ? amdgpu_drm_ioctl+0x6d/0x90 [amdgpu]
[270789.158722] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158724] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158726] ? arch_exit_to_user_mode_prepare.isra.0+0x22/0x120
[270789.158733] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158735] ? syscall_exit_to_user_mode+0x38/0x1d0
[270789.158740] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158742] ? do_syscall_64+0x8a/0x170
[270789.158745] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158747] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158749] ? ksys_write+0x9d/0xf0
[270789.158755] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158757] ? arch_exit_to_user_mode_prepare.isra.0+0x22/0x120
[270789.158759] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158761] ? syscall_exit_to_user_mode+0x38/0x1d0
[270789.158764] ? srso_alias_return_thunk+0x5/0xfbef5
[270789.158766] ? do_syscall_64+0x8a/0x170
[270789.158769] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[270789.158774] RIP: 0033:0x7134b1124e1d
[270789.158777] Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45
b0 10 00 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2
3d 00 f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00
[270789.158779] RSP: 002b:00007ffec10b3830 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[270789.158782] RAX: ffffffffffffffda RBX: 000055f4de875b40 RCX:
00007134b1124e1d
[270789.158784] RDX: 00007ffec10b38c0 RSI: 00000000c06864a2 RDI:
000000000000000e
[270789.158786] RBP: 00007ffec10b3880 R08: 0000000000000000 R09:
000055f4de07ccf0
[270789.158787] R10: 0000000000000000 R11: 0000000000000246 R12:
00007ffec10b38c0
[270789.158789] R13: 00000000c06864a2 R14: 000000000000000e R15:
000055f4de07ccf0
[270789.158795] </TASK>
[270789.158797] ---[ end trace 0000000000000000 ]---
$ cat /proc/version_signature
Ubuntu 6.14.0-35.35~24.04.1-generic 6.14.11
$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.3 LTS
Release: 24.04
-
- Kernel log from that entire boot is attached (spanning several days including
suspend/resumes in between).
+ Kernel log from that entire boot is attached (spanning several days
+ including suspend/resumes in between).
Will also attach lspci -vnvn log after.
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https://bugs.launchpad.net/bugs/2132008
Title:
6.14.0-35-generic - refcount_t: underflow; use-after-free seems to be
originating from amdgpu in Xorg
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