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Message-ID: <CABXGCsNAvXbOQxEWaHqf-iehX39OOOQwXBSJz7bZ6+68zn0tuA@mail.gmail.com>
Date: Sun, 28 Feb 2021 18:22:21 +0500
From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To: Hillf Danton <hdanton@...a.com>
Cc: LKML <linux-kernel@...r.kernel.org>, MM <linux-mm@...ck.org>,
Kees Cook <keescook@...omium.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: BUG: KASAN: use-after-free in __list_add_valid+0x81/0xa0 (5.11-rc4)
On Sat, 13 Feb 2021 at 08:03, Hillf Danton <hdanton@...a.com> wrote:
>
> The comment below shows a race instance, though I failed to put things
> together to see how within two hours. Cut it and see what will come up.
>
> --- a/mm/z3fold.c
> +++ b/mm/z3fold.c
> @@ -1129,19 +1129,22 @@ retry:
> page = NULL;
> if (can_sleep) {
> spin_lock(&pool->stale_lock);
> + spin_lock(&pool->lock);
> zhdr = list_first_entry_or_null(&pool->stale,
> struct z3fold_header, buddy);
> /*
> - * Before allocating a page, let's see if we can take one from
> + * Before allocating a page, lets see if we can take one from
> * the stale pages list. cancel_work_sync() can sleep so we
> * limit this case to the contexts where we can sleep
> */
> if (zhdr) {
> list_del(&zhdr->buddy);
> + spin_unlock(&pool->lock);
> spin_unlock(&pool->stale_lock);
> cancel_work_sync(&zhdr->work);
> page = virt_to_page(zhdr);
> } else {
> + spin_unlock(&pool->lock);
> spin_unlock(&pool->stale_lock);
> }
> }
Hi,
It happened again with the patch above.
Is anything cleared up now?
[32451.229358] list_add corruption. next->prev should be prev
(ffffd08fbc661cd0), but was ffffffffa7643650. (next=ffff9e4d2848f1c0).
[32451.229395] ------------[ cut here ]------------
[32451.229398] kernel BUG at lib/list_debug.c:23!
[32451.229408] invalid opcode: 0000 [#1] SMP NOPTI
[32451.229414] CPU: 4 PID: 80665 Comm: kworker/u64:0 Tainted: G
W --------- --- 5.11.0-155.fc35.x86_64+debug #1
[32451.229420] Hardware name: System manufacturer System Product
Name/ROG STRIX X570-I GAMING, BIOS 3402 01/13/2021
[32451.229424] Workqueue: zswap3 compact_page_work
[32451.229433] RIP: 0010:__list_add_valid.cold+0xf/0x3f
[32451.229439] Code: 48 c7 c6 24 26 64 a8 48 89 ef 49 c7 c7 ea ff ff
ff e8 e8 71 01 00 e9 fa 10 9e ff 4c 89 c1 48 c7 c7 f0 26 64 a8 e8 50
12 fe ff <0f> 0b 48 89 f2 4c 89 c1 48 89 fe 48 c7 c7 a0 27 64 a8 e8 39
12 fe
[32451.229444] RSP: 0018:ffffb08fd553fde0 EFLAGS: 00010286
[32451.229449] RAX: 0000000000000075 RBX: ffffe16d871550c0 RCX: 0000000000000000
[32451.229453] RDX: ffff9e53c73e9f60 RSI: ffff9e53c73db2a0 RDI: ffff9e53c73db2a0
[32451.229457] RBP: ffffd08fbc661cd0 R08: 0000000000000000 R09: ffffb08fd553fc20
[32451.229460] R10: ffffb08fd553fc18 R11: 0000000000000000 R12: ffff9e4ce4e29008
[32451.229464] R13: ffff9e4d85543010 R14: ffff9e4d2848f1c0 R15: ffff9e4d85543000
[32451.229468] FS: 0000000000000000(0000) GS:ffff9e53c7200000(0000)
knlGS:0000000000000000
[32451.229472] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[32451.229476] CR2: 00000fb21455dfe8 CR3: 0000000142968000 CR4: 0000000000350ee0
[32451.229480] Call Trace:
[32451.229485] do_compact_page+0x28d/0xb60
[32451.229492] ? debug_object_deactivate+0x55/0x140
[32451.229499] ? lock_release+0x1e9/0x400
[32451.229505] ? lock_release+0x1e9/0x400
[32451.229511] process_one_work+0x2b0/0x5e0
[32451.229519] worker_thread+0x55/0x3c0
[32451.229524] ? process_one_work+0x5e0/0x5e0
[32451.229531] kthread+0x13a/0x150
[32451.229540] ? __kthread_bind_mask+0x60/0x60
[32451.229548] ret_from_fork+0x22/0x30
[32451.229558] Modules linked in: snd_seq_dummy snd_hrtimer tun uinput
nls_utf8 isofs rfcomm netconsole nft_objref nf_conntrack_netbios_ns
nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
nf_tables nfnetlink cmac bnep zstd sunrpc xpad ff_memless vfat fat
hid_logitech_hidpp hid_logitech_dj joydev snd_hda_codec_realtek
snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi uvcvideo
videobuf2_vmalloc snd_hda_intel videobuf2_memops videobuf2_v4l2
snd_intel_dspcfg mt76x2u soundwire_intel mt76x2_common
videobuf2_common mt76x02_usb soundwire_generic_allocation mt76_usb
intel_rapl_msr intel_rapl_common iwlmvm snd_soc_core snd_usb_audio
videodev snd_compress mt76x02_lib btusb snd_usbmidi_lib
snd_pcm_dmaengine mt76 soundwire_cadence btrtl snd_rawmidi btbcm
snd_hda_codec mc btintel edac_mce_amd mac80211 kvm_amd snd_hda_core
uas bluetooth ac97_bus
[32451.229628] iwlwifi snd_hwdep usb_storage kvm snd_seq libarc4
snd_seq_device ecdh_generic cfg80211 ecc irqbypass snd_pcm rapl
eeepc_wmi asus_wmi sparse_keymap snd_timer rfkill snd video sp5100_tco
wmi_bmof i2c_piix4 k10temp soundcore acpi_cpufreq binfmt_misc
ip_tables amdgpu drm_ttm_helper ttm iommu_v2 gpu_sched
crct10dif_pclmul crc32_pclmul drm_kms_helper crc32c_intel cec drm igb
ghash_clmulni_intel nvme ccp dca nvme_core i2c_algo_bit wmi
pinctrl_amd fuse
[32451.229696] ---[ end trace 80d86d6942435514 ]---
[32451.229701] RIP: 0010:__list_add_valid.cold+0xf/0x3f
[32451.229706] Code: 48 c7 c6 24 26 64 a8 48 89 ef 49 c7 c7 ea ff ff
ff e8 e8 71 01 00 e9 fa 10 9e ff 4c 89 c1 48 c7 c7 f0 26 64 a8 e8 50
12 fe ff <0f> 0b 48 89 f2 4c 89 c1 48 89 fe 48 c7 c7 a0 27 64 a8 e8 39
12 fe
[32451.229710] RSP: 0018:ffffb08fd553fde0 EFLAGS: 00010286
[32451.229715] RAX: 0000000000000075 RBX: ffffe16d871550c0 RCX: 0000000000000000
[32451.229721] RDX: ffff9e53c73e9f60 RSI: ffff9e53c73db2a0 RDI: ffff9e53c73db2a0
[32451.229725] RBP: ffffd08fbc661cd0 R08: 0000000000000000 R09: ffffb08fd553fc20
[32451.229729] R10: ffffb08fd553fc18 R11: 0000000000000000 R12: ffff9e4ce4e29008
[32451.229732] R13: ffff9e4d85543010 R14: ffff9e4d2848f1c0 R15: ffff9e4d85543000
[32451.229736] FS: 0000000000000000(0000) GS:ffff9e53c7200000(0000)
knlGS:0000000000000000
[32451.229740] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[32451.229744] CR2: 00000fb21455dfe8 CR3: 0000000142968000 CR4: 0000000000350ee0
[32451.229748] note: kworker/u64:0[80665] exited with preempt_count 2
[32476.846645] watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
[vivaldi-bin:6991]
[32476.846658] Modules linked in: snd_seq_dummy snd_hrtimer tun uinput
nls_utf8 isofs rfcomm netconsole nft_objref nf_conntrack_netbios_ns
nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
nf_tables nfnetlink cmac bnep zstd sunrpc xpad ff_memless vfat fat
hid_logitech_hidpp hid_logitech_dj joydev snd_hda_codec_realtek
snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi uvcvideo
videobuf2_vmalloc snd_hda_intel videobuf2_memops videobuf2_v4l2
snd_intel_dspcfg mt76x2u soundwire_intel mt76x2_common
videobuf2_common mt76x02_usb soundwire_generic_allocation mt76_usb
intel_rapl_msr intel_rapl_common iwlmvm snd_soc_core snd_usb_audio
videodev snd_compress mt76x02_lib btusb snd_usbmidi_lib
snd_pcm_dmaengine mt76 soundwire_cadence btrtl snd_rawmidi btbcm
snd_hda_codec mc btintel edac_mce_amd mac80211 kvm_amd snd_hda_core
uas bluetooth ac97_bus
[32476.846704] iwlwifi snd_hwdep usb_storage kvm snd_seq libarc4
snd_seq_device ecdh_generic cfg80211 ecc irqbypass snd_pcm rapl
eeepc_wmi asus_wmi sparse_keymap snd_timer rfkill snd video sp5100_tco
wmi_bmof i2c_piix4 k10temp soundcore acpi_cpufreq binfmt_misc
ip_tables amdgpu drm_ttm_helper ttm iommu_v2 gpu_sched
crct10dif_pclmul crc32_pclmul drm_kms_helper crc32c_intel cec drm igb
ghash_clmulni_intel nvme ccp dca nvme_core i2c_algo_bit wmi
pinctrl_amd fuse
[32476.846874] irq event stamp: 0
[32476.846877] hardirqs last enabled at (0): [<0000000000000000>] 0x0
[32476.846883] hardirqs last disabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.846889] softirqs last enabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.846892] softirqs last disabled at (0): [<0000000000000000>] 0x0
[32476.846896] CPU: 0 PID: 6991 Comm: vivaldi-bin Tainted: G D W
--------- --- 5.11.0-155.fc35.x86_64+debug #1
[32476.846900] Hardware name: System manufacturer System Product
Name/ROG STRIX X570-I GAMING, BIOS 3402 01/13/2021
[32476.846904] RIP: 0010:native_queued_spin_lock_slowpath+0x1ce/0x200
[32476.846909] Code: c1 ef 12 83 e0 03 83 ef 01 48 c1 e0 05 48 63 ff
48 05 80 f1 1e 00 48 03 04 fd 00 39 6e a8 48 89 08 8b 41 08 85 c0 75
09 f3 90 <8b> 41 08 85 c0 74 f7 48 8b 39 48 85 ff 0f 84 56 ff ff ff 0f
0d 0f
[32476.846913] RSP: 0000:ffffb08fd2937c10 EFLAGS: 00000246
[32476.846917] RAX: 0000000000000000 RBX: ffffe16d9e844240 RCX: ffff9e53c6bef180
[32476.846920] RDX: ffff9e4cc11a3d28 RSI: 0000000000040000 RDI: 000000000000000d
[32476.846923] RBP: ffff9e4cc11a3d28 R08: 0000000000040000 R09: 0000000000000000
[32476.846926] R10: 0000000000000001 R11: 0000000000000000 R12: ffff9e4cc11a3d40
[32476.846929] R13: ffff9e4cc11a3d28 R14: ffff9e4cc11a3d20 R15: 0000000000ddd8d8
[32476.846932] FS: 00007f4b852a0300(0000) GS:ffff9e53c6a00000(0000)
knlGS:0000000000000000
[32476.846935] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[32476.846939] CR2: 00003d0509d83000 CR3: 000000017733a000 CR4: 0000000000350ef0
[32476.846942] Call Trace:
[32476.846946] do_raw_spin_lock+0x94/0xa0
[32476.846951] _raw_spin_lock+0x63/0x80
[32476.846955] zswap_frontswap_load+0x2f/0x2f0
[32476.846960] ? psi_group_change+0x27d/0x290
[32476.846965] __frontswap_load+0xc3/0x160
[32476.846969] swap_readpage+0x1ca/0x3a0
[32476.846974] swapin_readahead+0x2ee/0x4e0
[32476.846979] do_swap_page+0x4a4/0x900
[32476.846983] ? lock_release+0x1e9/0x400
[32476.846987] ? trace_hardirqs_on+0x1b/0xe0
[32476.846992] handle_mm_fault+0xe7d/0x19d0
[32476.846997] do_user_addr_fault+0x1c7/0x4c0
[32476.847003] exc_page_fault+0x67/0x2a0
[32476.847007] ? asm_exc_page_fault+0x8/0x30
[32476.847011] asm_exc_page_fault+0x1e/0x30
[32476.847015] RIP: 0033:0x55a5d9c33379
[32476.847018] Code: 00 00 4d 89 75 00 4c 89 f0 48 25 00 00 fc ff 48
8b 40 08 41 c7 46 03 03 00 00 00 49 8b 4d 00 44 89 61 07 49 8b 5d 00
4d 8b 37 <44> 89 73 0b a9 00 00 04 00 75 1a 83 e0 18 48 85 c0 74 12 49
8b 45
[32476.847022] RSP: 002b:00007fff34882340 EFLAGS: 00010206
[32476.847025] RAX: 0000000000000012 RBX: 00003d0509d82ff5 RCX: 00003d0509d82ff5
[32476.847028] RDX: 000055a5dbb578bb RSI: 0000000000000001 RDI: 0000000000000000
[32476.847031] RBP: 00007fff34882370 R08: 0000000000000000 R09: 0000000000000000
[32476.847034] R10: 00003d0500000000 R11: ffffffff00000000 R12: 0000000000000023
[32476.847037] R13: 0000376895df40a0 R14: 00003d0509d82f7d R15: 0000376895df4080
[32476.849645] watchdog: BUG: soft lockup - CPU#1 stuck for 22s!
[Chrome_ChildIOT:5472]
[32476.849652] Modules linked in: snd_seq_dummy snd_hrtimer tun uinput
nls_utf8 isofs rfcomm netconsole nft_objref nf_conntrack_netbios_ns
nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
nf_tables nfnetlink cmac bnep zstd sunrpc xpad ff_memless vfat fat
hid_logitech_hidpp hid_logitech_dj joydev snd_hda_codec_realtek
snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi uvcvideo
videobuf2_vmalloc snd_hda_intel videobuf2_memops videobuf2_v4l2
snd_intel_dspcfg mt76x2u soundwire_intel mt76x2_common
videobuf2_common mt76x02_usb soundwire_generic_allocation mt76_usb
intel_rapl_msr intel_rapl_common iwlmvm snd_soc_core snd_usb_audio
videodev snd_compress mt76x02_lib btusb snd_usbmidi_lib
snd_pcm_dmaengine mt76 soundwire_cadence btrtl snd_rawmidi btbcm
snd_hda_codec mc btintel edac_mce_amd mac80211 kvm_amd snd_hda_core
uas bluetooth ac97_bus
[32476.849687] iwlwifi snd_hwdep usb_storage kvm snd_seq libarc4
snd_seq_device ecdh_generic cfg80211 ecc irqbypass snd_pcm rapl
eeepc_wmi asus_wmi sparse_keymap snd_timer rfkill snd video sp5100_tco
wmi_bmof i2c_piix4 k10temp soundcore acpi_cpufreq binfmt_misc
ip_tables amdgpu drm_ttm_helper ttm iommu_v2 gpu_sched
crct10dif_pclmul crc32_pclmul drm_kms_helper crc32c_intel cec drm igb
ghash_clmulni_intel nvme ccp dca nvme_core i2c_algo_bit wmi
pinctrl_amd fuse
[32476.849713] irq event stamp: 0
[32476.849715] hardirqs last enabled at (0): [<0000000000000000>] 0x0
[32476.849719] hardirqs last disabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.849723] softirqs last enabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.849726] softirqs last disabled at (0): [<0000000000000000>] 0x0
[32476.849728] CPU: 1 PID: 5472 Comm: Chrome_ChildIOT Tainted: G
D W L --------- --- 5.11.0-155.fc35.x86_64+debug #1
[32476.849732] Hardware name: System manufacturer System Product
Name/ROG STRIX X570-I GAMING, BIOS 3402 01/13/2021
[32476.849734] RIP: 0010:native_queued_spin_lock_slowpath+0x1ce/0x200
[32476.849738] Code: c1 ef 12 83 e0 03 83 ef 01 48 c1 e0 05 48 63 ff
48 05 80 f1 1e 00 48 03 04 fd 00 39 6e a8 48 89 08 8b 41 08 85 c0 75
09 f3 90 <8b> 41 08 85 c0 74 f7 48 8b 39 48 85 ff 0f 84 56 ff ff ff 0f
0d 0f
[32476.849741] RSP: 0000:ffffb08fc6c4bc10 EFLAGS: 00000246
[32476.849744] RAX: 0000000000000000 RBX: ffffe16d96c11140 RCX: ffff9e53c6def180
[32476.849746] RDX: ffff9e4cc11a3d28 RSI: 0000000000080000 RDI: 0000000000000016
[32476.849749] RBP: ffff9e4cc11a3d28 R08: 0000000000080000 R09: 0000000000000000
[32476.849751] R10: 0000000000000001 R11: 0000000000000000 R12: ffff9e4cc11a3d40
[32476.849753] R13: ffff9e4cc11a3d28 R14: ffff9e4cc11a3d20 R15: 0000000000f89940
[32476.849756] FS: 00007f9a02233640(0000) GS:ffff9e53c6c00000(0000)
knlGS:0000000000000000
[32476.849758] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[32476.849761] CR2: 00002312fd44ecd8 CR3: 00000001618f6000 CR4: 0000000000350ee0
[32476.849763] Call Trace:
[32476.849766] do_raw_spin_lock+0x94/0xa0
[32476.849769] _raw_spin_lock+0x63/0x80
[32476.849772] zswap_frontswap_load+0x2f/0x2f0
[32476.849775] ? psi_group_change+0x27d/0x290
[32476.849779] __frontswap_load+0xc3/0x160
[32476.849782] swap_readpage+0x1ca/0x3a0
[32476.849786] swapin_readahead+0x450/0x4e0
[32476.849789] ? lock_release+0x1e9/0x400
[32476.849793] do_swap_page+0x4a4/0x900
[32476.849796] ? lock_release+0x1e9/0x400
[32476.849799] ? trace_hardirqs_on+0x1b/0xe0
[32476.849802] handle_mm_fault+0xe7d/0x19d0
[32476.849807] do_user_addr_fault+0x1c7/0x4c0
[32476.849810] exc_page_fault+0x67/0x2a0
[32476.849813] ? asm_exc_page_fault+0x8/0x30
[32476.849816] asm_exc_page_fault+0x1e/0x30
[32476.849819] RIP: 0033:0x555d3e644fe2
[32476.849822] Code: c3 cc cc cc cc cc cc cc 55 48 89 e5 41 57 41 56
53 48 83 ec 68 49 89 fe 4c 8b 3f 48 8b 05 76 4d bd 08 49 8b 1f 48 31
c3 74 67 <48> 33 43 08 49 39 c7 74 4e c7 45 b8 04 00 00 00 c7 45 c8 04
00 00
[32476.849824] RSP: 002b:00007f9a02231ab0 EFLAGS: 00010202
[32476.849827] RAX: fffffffd55160cdb RBX: 00002312fd44ecd0 RCX: 0000000000000005
[32476.850461] RDX: 0000000000000000 RSI: 0000000000000005 RDI: 00002312fcd3f2a0
[32476.850463] RBP: 00007f9a02231b30 R08: 00002312fcfa4003 R09: 00007ffd204a88d0
[32476.850465] R10: 0000000000000000 R11: 0000000000000246 R12: 0000555d3e492590
[32476.850467] R13: 0000555d3e4cd840 R14: 00002312fcd3f2a0 R15: 00002312fd2481e0
[32476.850644] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [brave:5451]
[32476.850652] Modules linked in: snd_seq_dummy snd_hrtimer tun uinput
nls_utf8 isofs rfcomm netconsole nft_objref nf_conntrack_netbios_ns
nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
nf_tables nfnetlink cmac bnep zstd sunrpc xpad ff_memless vfat fat
hid_logitech_hidpp hid_logitech_dj joydev snd_hda_codec_realtek
snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi uvcvideo
videobuf2_vmalloc snd_hda_intel videobuf2_memops videobuf2_v4l2
snd_intel_dspcfg mt76x2u soundwire_intel mt76x2_common
videobuf2_common mt76x02_usb soundwire_generic_allocation mt76_usb
intel_rapl_msr intel_rapl_common iwlmvm snd_soc_core snd_usb_audio
videodev snd_compress mt76x02_lib btusb snd_usbmidi_lib
snd_pcm_dmaengine mt76 soundwire_cadence btrtl snd_rawmidi btbcm
snd_hda_codec mc btintel edac_mce_amd mac80211 kvm_amd snd_hda_core
uas bluetooth ac97_bus
[32476.850687] iwlwifi snd_hwdep usb_storage kvm snd_seq libarc4
snd_seq_device ecdh_generic cfg80211 ecc irqbypass snd_pcm rapl
eeepc_wmi asus_wmi sparse_keymap snd_timer rfkill snd video sp5100_tco
wmi_bmof i2c_piix4 k10temp soundcore acpi_cpufreq binfmt_misc
ip_tables amdgpu drm_ttm_helper ttm iommu_v2 gpu_sched
crct10dif_pclmul crc32_pclmul drm_kms_helper crc32c_intel cec drm igb
ghash_clmulni_intel nvme ccp dca nvme_core i2c_algo_bit wmi
pinctrl_amd fuse
[32476.850714] irq event stamp: 0
[32476.850716] hardirqs last enabled at (0): [<0000000000000000>] 0x0
[32476.850719] hardirqs last disabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.850723] softirqs last enabled at (0): [<ffffffffa70ddccb>]
copy_process+0x8fb/0x1de0
[32476.850726] softirqs last disabled at (0): [<0000000000000000>] 0x0
Full kernel log is here: https://pastebin.com/4SbhNp7V
--
Best Regards,
Mike Gavrilov.
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