Re: [Re] kernel panic during shutdown in next-20260722

[Bert Karwatzki <spasswolf@web.de>]

Am Samstag, dem 25.07.2026 um 21:58 +0200 schrieb Bert Karwatzki:
> Am Freitag, dem 24.07.2026 um 17:08 +0200 schrieb Bert Karwatzki:
> > 
> > 
> > 2) The "scheduling while atomic" errors which occur in v7.2-rc4 and earlier, once I figure out
> > these I'll contiue here (v6.19 is free from these errors)
> > 
> > Bert Karwatzki
> 
> To figure out the "scheduling while atomic" errors when rebooting from v7.1 I first retested
> 
> commit 8bf0cb97edb ("drm/amd/display: Move dml2_destroy to non-FPU compilation unit")
> 
> which was supposed to fix "scheduling while atomic" errors introduced by these patches:
> 
> 32c1c35b6d8b drm/amd/display: Move FPU Guards From DML To DC - Part 3
> 4bb2f0721ed8 drm/amd/display: Move FPU Guards From DML To DC - Part 2
> 3539437f354b drm/amd/display: Move FPU Guards From DML To DC - Part 1
> 
> https://lore.kernel.org/lkml/20260409131411.10598-1-spasswolf@web.de/
> 
> 
> Which shows that the fix in commit 8bf0cb97edb may be incomplete.
> 
> Bert Karwatzki

I did yet another test of
commit 8bf0cb97edb ("drm/amd/display: Move dml2_destroy to non-FPU compilation unit")
this time with CONFIG_LOCKDEP=y and got a kernel panic:

T4648;netconsole: network logging started
T4648;netconsole-setup: Test log message to verify netconsole configuration.
T1508;BUG: scheduling while atomic: Xorg/1508/0x00000003
T1508;4 locks held by Xorg/1508:
T1508; #0: ffffb949cd76b9f8 (crtc_ww_class_acquire){+.+.}-{0:0}, at: set_property_atomic+0x51/0x150 [drm]
T1508; #1: ffffb949cd76ba20 (crtc_ww_class_mutex){+.+.}-{4:4}, at: set_property_atomic+0x51/0x150 [drm]
T1508; #2: ffff980422565478 (&adev->dm.dc_lock){+.+.}-{4:4}, at: amdgpu_dm_atomic_commit_tail+0x120a/0x3460 [amdgpu]
T1508; #3: ffffffff9cdbcc50 (&zone->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x261/0x19f0
T1508,ncfrag=0/979;Modules linked in: netconsole ccm snd_seq_dummy snd_hrtimer snd_seq nls_ascii nls_cp437 vfat fat mt7925e mt7925_common snd_hda_codec_atihdmi
joydev snd_usb_audio mt792x_lib snd_hda_codec_hdmi intel_rapl_msr mt76_connac_lib snd_usbmidi_lib snd_ump intel_rapl_common mt76 snd_rawmidi iosf_mbi
snd_seq_device snd_hda_intel mac80211 rapl wmi_bmof snd_hda_codec snd_hda_core libarc4 snd_intel_dspcfg spd5118 snd_hwdep cfg80211 regmap_i2c snd_pcm pcspkr
snd_timer snd rfkill soundcore evdev ccp k10temp nct6775 nct6775_core hwmon_vid efi_pstore configfs efivarfs autofs4 ext4 mbcache jbd2 amdgpu hid_generic usbhid
hid drm_client_lib i2c_algo_bit drm_buddy drm_ttm_helper ttm drm_exec drm_suballoc_helper mfd_core drm_panel_backlight_quirks gpu_sched amdxcp
drm_display_helper drm_kms_helper ahci libahci drm libata scsi_mod cec xhci_pci igc scsi_common crc16 xhci_hcd nvme nvme_core video usbcore nvme_keyring
nvme_auth hkd
T1508,ncfrag=918/979;f usb_common i2c_piix4 gpio_amdpt gpio_generic i2c_smbus wmi
T1508;CPU: 23 UID: 0 PID: 1508 Comm: Xorg Tainted: G        W           7.0.0-rc7-lockdep-01908-g8bf0cb97edb6 #1264 PREEMPT_{RT,(full)} 
T1508;Tainted: [W]=WARN
T1508;Hardware name: ASUS System Product Name/ROG STRIX B850-F GAMING WIFI, BIOS 1627 02/05/2026
T1508;Call Trace:
T1508; <TASK>
T1508; ? dump_stack_lvl+0x5b/0x80
T1508; ? __schedule_bug.cold+0x5a/0x67
T1508; ? __schedule+0x1468/0x1ae0
T1508; ? rtlock_slowlock_locked+0x281/0x1aa0
T1508; ? mark_held_locks+0x40/0x70
T1508; ? schedule_rtlock+0x15/0x30
T1508; ? rtlock_slowlock_locked+0x5b4/0x1aa0
T1508; ? lock_acquire+0xbf/0x2e0
T1508; ? rt_spin_lock+0x85/0x1b0
T1508; ? get_page_from_freelist+0x261/0x19f0
T1508; ? __lock_acquire+0x49a/0x2590
T1508; ? dc_link_get_highest_encoding_format+0x61/0xb0 [amdgpu]
T1508; ? __alloc_frozen_pages_noprof+0x158/0x370
T1508; ? ___kmalloc_large_node+0xd7/0xf0
T1508; ? __kmalloc_large_node_noprof+0x1b/0x130
T1508; ? __kvmalloc_node_noprof+0x4ad/0x730
T1508; ? dc_create_plane_state+0x24/0x80 [amdgpu]
T1508; ? dc_create_plane_state+0x24/0x80 [amdgpu]
T1508; ? dc_state_create_phantom_plane+0x15/0x50 [amdgpu]
T1508; ? dml21_handle_phantom_streams_planes+0x292/0x510 [amdgpu]
T1508; ? dml21_mode_check_and_programming+0x157/0x7e0 [amdgpu]
T1508; ? spl_set_filters_data+0xbc/0xd0 [amdgpu]
T1508; ? spl_calculate_scaler_params+0x39d/0x1c00 [amdgpu]
T1508; ? dc_state_remove_plane+0xbf/0x160 [amdgpu]
T1508; ? dcn401_validate_bandwidth+0xb8/0x1f0 [amdgpu]
T1508; ? update_planes_and_stream_state+0xeb5/0x1520 [amdgpu]
T1508; ? __lock_acquire+0x49a/0x2590
T1508; ? update_planes_and_stream_prepare_v3+0xb3/0x430 [amdgpu]
T1508; ? dc_update_planes_and_stream+0x87/0x130 [amdgpu]
T1508; ? amdgpu_dm_atomic_commit_tail+0x126b/0x3460 [amdgpu]
T1508; ? commit_tail+0x9d/0x130 [drm_kms_helper]
T1508; ? drm_atomic_helper_commit+0x15a/0x1a0 [drm_kms_helper]
T1508; ? drm_atomic_commit+0xac/0xe0 [drm]
T1508; ? __drm_universal_plane_init.cold+0x17/0x17 [drm]
T1508; ? set_property_atomic+0x82/0x150 [drm]
T1508; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
T1508; ? drm_mode_obj_set_property_ioctl+0xe6/0x150 [drm]
T1508; ? drm_ioctl_kernel+0xa7/0x100 [drm]
T1508; ? drm_ioctl+0x288/0x510 [drm]
T1508; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
T1508; ? rt_mutex_slowunlock+0x3bd/0x420
T1508; ? amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]
T1508; ? __x64_sys_ioctl+0x95/0xe0
T1508; ? do_syscall_64+0x129/0x6b0
T1508; ? kmem_cache_free+0x179/0x4c0
T1508; ? lockdep_hardirqs_on_prepare+0xd7/0x180
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? trace_hardirqs_off+0x4e/0xf0
T1508; ? exit_to_user_mode_loop+0xf8/0x460
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? vfs_writev+0x9a/0x490
T1508; ? find_held_lock+0x2b/0x80
T1508; ? __fget_files+0xbf/0x190
T1508; ? lock_release+0xd3/0x2f0
T1508; ? do_writev+0xf4/0x110
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? flush_tlb_func+0x74/0x340
T1508; ? do_writev+0xf4/0x110
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? lockdep_hardirqs_on_prepare+0xd7/0x180
T1508; ? irqentry_exit+0xbd/0x5a0
T1508; ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
T1508; </TASK>
C23;------------[ cut here ]------------
T1508;WARNING: drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/dc_fpu.c:97 at dc_fpu_begin+0x160/0x170 [amdgpu], CPU#23: Xorg/1508
T1508,ncfrag=0/979;Modules linked in: netconsole ccm snd_seq_dummy snd_hrtimer snd_seq nls_ascii nls_cp437 vfat fat mt7925e mt7925_common snd_hda_codec_atihdmi
joydev snd_usb_audio mt792x_lib snd_hda_codec_hdmi intel_rapl_msr mt76_connac_lib snd_usbmidi_lib snd_ump intel_rapl_common mt76 snd_rawmidi iosf_mbi
snd_seq_device snd_hda_intel mac80211 rapl wmi_bmof snd_hda_codec snd_hda_core libarc4 snd_intel_dspcfg spd5118 snd_hwdep cfg80211 regmap_i2c snd_pcm pcspkr
snd_timer snd rfkill soundcore evdev ccp k10temp nct6775 nct6775_core hwmon_vid efi_pstore configfs efivarfs autofs4 ext4 mbcache jbd2 amdgpu hid_generic usbhid
hid drm_client_lib i2c_algo_bit drm_buddy drm_ttm_helper ttm drm_exec drm_suballoc_helper mfd_core drm_panel_backlight_quirks gpu_sched amdxcp
drm_display_helper drm_kms_helper ahci libahci drm libata scsi_mod cec xhci_pci igc scsi_common crc16 xhci_hcd nvme nvme_core video usbcore nvme_keyring
nvme_auth hkd
T1508,ncfrag=918/979;f usb_common i2c_piix4 gpio_amdpt gpio_generic i2c_smbus wmi
T1508;CPU: 23 UID: 0 PID: 1508 Comm: Xorg Tainted: G        W           7.0.0-rc7-lockdep-01908-g8bf0cb97edb6 #1264 PREEMPT_{RT,(full)} 
T1508;Tainted: [W]=WARN
T1508;Hardware name: ASUS System Product Name/ROG STRIX B850-F GAMING WIFI, BIOS 1627 02/05/2026
T1508;RIP: 0010:dc_fpu_begin+0x160/0x170 [amdgpu]
T1508;Code: ff bf 02 00 00 00 89 4c 24 14 4c 89 4c 24 08 44 89 04 24 e8 c2 63 12 db 8b 4c 24 14 4c 8b 4c 24 08 44 8b 04 24 e9 f5 fe ff ff <0f> 0b e9 ce fe ff ff
66 0f 1f 84 00 00 00 00 00 0f 1f 40 d6 41 56
T1508;RSP: 0018:ffffb949cd76b570 EFLAGS: 00010206
T1508;RAX: 0000000000ff0000 RBX: ffff980423000000 RCX: 00000000000006c8
T1508;RDX: 0000000000ff0000 RSI: 00000000000006c8 RDI: ffffffffc11c3960
T1508;RBP: ffff980522a00000 R08: 0000000000005183 R09: ffffffffc11c3960
T1508;R10: ffffb949cd76b508 R11: 0000000000000002 R12: ffff980448140000
T1508;R13: 0000000000000001 R14: ffff980423000000 R15: ffff980566daa000
T1508;FS:  00007f93c3e6fb80(0000) GS:ffff9813a0a46000(0000) knlGS:0000000000000000
T1508;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
T1508;CR2: 00007ff941d9d000 CR3: 000000011261e000 CR4: 0000000000f50ef0
T1508;PKRU: 55555554
T1508;Call Trace:
T1508; <TASK>
T1508; ? determine_pipe_unlock_order+0x78/0xf0 [amdgpu]
T1508; ? dcn401_prepare_mcache_programming+0x2f/0x70 [amdgpu]
T1508; ? commit_planes_for_stream+0x157/0x1870 [amdgpu]
T1508; ? update_planes_and_stream_execute_v3+0x3c/0xd0 [amdgpu]
T1508; ? dc_update_planes_and_stream+0xb6/0x130 [amdgpu]
T1508; ? amdgpu_dm_atomic_commit_tail+0x126b/0x3460 [amdgpu]
T1508; ? commit_tail+0x9d/0x130 [drm_kms_helper]
T1508; ? drm_atomic_helper_commit+0x15a/0x1a0 [drm_kms_helper]
T1508; ? drm_atomic_commit+0xac/0xe0 [drm]
T1508; ? __drm_universal_plane_init.cold+0x17/0x17 [drm]
T1508; ? set_property_atomic+0x82/0x150 [drm]
T1508; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
T1508; ? drm_mode_obj_set_property_ioctl+0xe6/0x150 [drm]
T1508; ? drm_ioctl_kernel+0xa7/0x100 [drm]
T1508; ? drm_ioctl+0x288/0x510 [drm]
T1508; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
T1508; ? rt_mutex_slowunlock+0x3bd/0x420
T1508; ? amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]
T1508; ? __x64_sys_ioctl+0x95/0xe0
T1508; ? do_syscall_64+0x129/0x6b0
T1508; ? kmem_cache_free+0x179/0x4c0
T1508; ? lockdep_hardirqs_on_prepare+0xd7/0x180
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? trace_hardirqs_off+0x4e/0xf0
T1508; ? exit_to_user_mode_loop+0xf8/0x460
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? vfs_writev+0x9a/0x490
T1508; ? find_held_lock+0x2b/0x80
T1508; ? __fget_files+0xbf/0x190
T1508; ? lock_release+0xd3/0x2f0
T1508; ? do_writev+0xf4/0x110
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? flush_tlb_func+0x74/0x340
T1508; ? do_writev+0xf4/0x110
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? do_syscall_64+0x238/0x6b0
T1508; ? trace_hardirqs_on_prepare+0xdc/0x100
T1508; ? lockdep_hardirqs_on_prepare+0xd7/0x180
T1508; ? irqentry_exit+0xbd/0x5a0
T1508; ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
T1508; </TASK>
T1508;irq event stamp: 11300063
T1508;hardirqs last  enabled at (11300065): [<ffffffff9bb6683d>] vprintk_store+0x36d/0x5e0
T1508;hardirqs last disabled at (11300066): [<ffffffff9bb6685f>] vprintk_store+0x38f/0x5e0
T1508;softirqs last  enabled at (11293958): [<ffffffff9bacb56b>] __local_bh_enable_ip+0xfb/0x140
T1508;softirqs last disabled at (11293948): [<ffffffff9c49b14d>] unix_release_sock+0xfd/0x540
T1508;---[ end trace 0000000000000000 ]---
C23;------------[ cut here ]------------
C23;kernel BUG at mm/vmalloc.c:3412!
C23;Oops: invalid opcode: 0000 [#1] SMP NOPTI
C23;CPU: 23 UID: 0 PID: 1508 Comm: Xorg Tainted: G        W           7.0.0-rc7-lockdep-01908-g8bf0cb97edb6 #1264 PREEMPT_{RT,(full)} 
C23;Tainted: [W]=WARN
C23;Hardware name: ASUS System Product Name/ROG STRIX B850-F GAMING WIFI, BIOS 1627 02/05/2026
C23;RIP: 0010:vfree_atomic+0x55/0x60
C23;Code: 07 48 89 c1 f0 48 0f b1 3a 75 f3 48 85 c9 74 05 c3 cc cc cc cc 48 8b 35 a1 70 c1 00 48 83 c2 08 bf 20 00 00 00 e9 cb 29 d6 ff <0f> 0b 66 0f 1f 84 00
00 00 00 00 f3 0f 1e fa 41 56 41 54 55 53 48
C23;RSP: 0018:ffffb949cd76b5f8 EFLAGS: 00010286
C23;RAX: 0000000000ff0000 RBX: ffffb949cdfd5000 RCX: 0000000000000183
C23;RDX: 0000000000ff0000 RSI: 000000000000003d RDI: ffffb949e08ad000
C23;RBP: ffff98058f900000 R08: 0000000000000000 R09: ffffffffc11e6d50
C23;R10: 0000000000000006 R11: ffff9804480c8ad0 R12: ffff980448140000
C23;R13: ffff980423000000 R14: 0000000000000001 R15: ffff980566daa000
C23;FS:  00007f93c3e6fb80(0000) GS:ffff9813a0a46000(0000) knlGS:0000000000000000
C23;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
C23;CR2: 00007ff941d9d000 CR3: 000000011261e000 CR4: 0000000000f50ef0
C23;PKRU: 55555554
C23;Call Trace:
C23; <TASK>
C23; ? dml21_destroy+0x50/0xa0 [amdgpu]
C23; ? dml2_destroy+0x59/0x60 [amdgpu]
C23; ? dc_state_free+0x31/0x70 [amdgpu]
C23; ? update_planes_and_stream_cleanup_v3+0x4f/0x3e0 [amdgpu]
C23; ? dc_update_planes_and_stream+0xc4/0x130 [amdgpu]
C23; ? amdgpu_dm_atomic_commit_tail+0x126b/0x3460 [amdgpu]
C23; ? commit_tail+0x9d/0x130 [drm_kms_helper]
C23; ? drm_atomic_helper_commit+0x15a/0x1a0 [drm_kms_helper]
C23; ? drm_atomic_commit+0xac/0xe0 [drm]
C23; ? __drm_universal_plane_init.cold+0x17/0x17 [drm]
C23; ? set_property_atomic+0x82/0x150 [drm]
C23; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
C23; ? drm_mode_obj_set_property_ioctl+0xe6/0x150 [drm]
C23; ? drm_ioctl_kernel+0xa7/0x100 [drm]
C23; ? drm_ioctl+0x288/0x510 [drm]
C23; ? drm_mode_obj_find_prop_id+0x60/0x60 [drm]
C23; ? rt_mutex_slowunlock+0x3bd/0x420
C23; ? amdgpu_drm_ioctl+0x4b/0x80 [amdgpu]
C23; ? __x64_sys_ioctl+0x95/0xe0
C23; ? do_syscall_64+0x129/0x6b0
C23; ? kmem_cache_free+0x179/0x4c0
C23; ? lockdep_hardirqs_on_prepare+0xd7/0x180
C23; ? trace_hardirqs_on_prepare+0xdc/0x100
C23; ? do_syscall_64+0x238/0x6b0
C23; ? trace_hardirqs_off+0x4e/0xf0
C23; ? exit_to_user_mode_loop+0xf8/0x460
C23; ? trace_hardirqs_on_prepare+0xdc/0x100
C23; ? do_syscall_64+0x238/0x6b0
C23; ? vfs_writev+0x9a/0x490
C23; ? find_held_lock+0x2b/0x80
C23; ? __fget_files+0xbf/0x190
C23; ? lock_release+0xd3/0x2f0
C23; ? do_writev+0xf4/0x110
C23; ? trace_hardirqs_on_prepare+0xdc/0x100
C23; ? do_syscall_64+0x238/0x6b0
C23; ? flush_tlb_func+0x74/0x340
C23; ? do_writev+0xf4/0x110
C23; ? trace_hardirqs_on_prepare+0xdc/0x100
C23; ? do_syscall_64+0x238/0x6b0
C23; ? trace_hardirqs_on_prepare+0xdc/0x100
C23; ? lockdep_hardirqs_on_prepare+0xd7/0x180
C23; ? irqentry_exit+0xbd/0x5a0
C23; ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
C23; </TASK>
C23,ncfrag=0/979;Modules linked in: netconsole ccm snd_seq_dummy snd_hrtimer snd_seq nls_ascii nls_cp437 vfat fat mt7925e mt7925_common snd_hda_codec_atihdmi
joydev snd_usb_audio mt792x_lib snd_hda_codec_hdmi intel_rapl_msr mt76_connac_lib snd_usbmidi_lib snd_ump intel_rapl_common mt76 snd_rawmidi iosf_mbi
snd_seq_device snd_hda_intel mac80211 rapl wmi_bmof snd_hda_codec snd_hda_core libarc4 snd_intel_dspcfg spd5118 snd_hwdep cfg80211 regmap_i2c snd_pcm pcspkr
snd_timer snd rfkill soundcore evdev ccp k10temp nct6775 nct6775_core hwmon_vid efi_pstore configfs efivarfs autofs4 ext4 mbcache jbd2 amdgpu hid_generic usbhid
hid drm_client_lib i2c_algo_bit drm_buddy drm_ttm_helper ttm drm_exec drm_suballoc_helper mfd_core drm_panel_backlight_quirks gpu_sched amdxcp
drm_display_helper drm_kms_helper ahci libahci drm libata scsi_mod cec xhci_pci igc scsi_common crc16 xhci_hcd nvme nvme_core video usbcore nvme_keyring
nvme_auth hkdf 
C23,ncfrag=920/979;usb_common i2c_piix4 gpio_amdpt gpio_generic i2c_smbus wmi
C23;---[ end trace 0000000000000000 ]---
C23;RIP: 0010:vfree_atomic+0x55/0x60
C23;Code: 07 48 89 c1 f0 48 0f b1 3a 75 f3 48 85 c9 74 05 c3 cc cc cc cc 48 8b 35 a1 70 c1 00 48 83 c2 08 bf 20 00 00 00 e9 cb 29 d6 ff <0f> 0b 66 0f 1f 84 00
00 00 00 00 f3 0f 1e fa 41 56 41 54 55 53 48
C23;RSP: 0018:ffffb949cd76b5f8 EFLAGS: 00010286
C23;RAX: 0000000000ff0000 RBX: ffffb949cdfd5000 RCX: 0000000000000183
C23;RDX: 0000000000ff0000 RSI: 000000000000003d RDI: ffffb949e08ad000
C23;RBP: ffff98058f900000 R08: 0000000000000000 R09: ffffffffc11e6d50
C23;R10: 0000000000000006 R11: ffff9804480c8ad0 R12: ffff980448140000
C23;R13: ffff980423000000 R14: 0000000000000001 R15: ffff980566daa000
C23;FS:  00007f93c3e6fb80(0000) GS:ffff9813a0a46000(0000) knlGS:0000000000000000
C23;CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
C23;CR2: 00007ff941d9d000 CR3: 000000011261e000 CR4: 0000000000f50ef0
C23;PKRU: 55555554
C23;Kernel panic - not syncing: Fatal exception in interrupt
C23;Kernel Offset: 0x1a800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
C23;---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---

This BUG_ON() is triggered:

void vfree_atomic(const void *addr)
{
	struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);

	BUG_ON(in_nmi());

Bert Karwatzki