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linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Andrew Morton , linux-mm@kvack.org, Jakub Kicinski , Peter Zijlstra , torvalds@linux-foundation.org, x86@kernel.org, tglx@linutronix.de, bp@alien8.de Subject: (Re)boot hangs and refcount errors on next-20250829 Date: Sun, 31 Aug 2025 16:14:24 +0200 Message-ID: <20250831141426.2786-1-spasswolf@web.de> X-Mailer: git-send-email 2.47.2 In-Reply-To: aKz38QetUrDfKP8P@google.com References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:N9VWeXH/Ywm44VaLkfiHeYXYHbgqPMcH5yoloQuzS+EC3UicwwM 8EAqfHDCld52zS01oQS2DYO4wmf9grgq2Rs0rPmduSHdipol+SCfeAHy3QqJaE8xOM1N6DX FYC7XLGrx8QvbQa/cDcSLtZWWpSet9rJCELUtWUB+ghFKmBk/sE5odE5d70sbiFPDf9CCm6 d8Ikj9iKbpBbMGBwjNAoQ== UI-OutboundReport: notjunk:1;M01:P0:nQR6TZfz6h0=;RNYHEh8IN/jwqMcq43fl7Kh2CCK FebdAlAgiJA8bpwveQnmBXUbT/iSYdXv3+Gls1McZS/aNH5yP5HtDLTC6pSUt0avJLAoulfkn 9/YdfXsOb2TigWn5MqWwPXQvqaMHNGBsVBGRhIVHBFn+v0rRoB4NbpmRzIfPpasNU9QNFI8g5 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 XY4QvtAg 4EcJgg0+563yFLVa+zSxSwq1JzSDIoD3XEzxkP0Ey1u9/Nc6VSPSnaWJZLEAVDW49MhDbFzXHfCKtnaP+otX5XOaWuGVpxZFS8Qr7xmM1XqGJ5mCsNxJG/LQ/fyJJFb0ia7iybxa//BqGGePoB6GzYSS77cJzpep3deIZUMVAy73UvqAf6toP2N35zkuebwMFAfYY1i/r8+vxDTp10Gu/m4D+J7Jbn9CvC+925wJetD2ELRHhVTsanhtuMiZ/McRO62XQ3rjCL8FJiRONrb0uI9EjrIuLjn9GpR+3aBe+Tvf4zMmNbZyVg2JZMg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: I think I hit the the same error (and some more ...) when booting next-2025= 0829 on my amd64 laptop (no VMs and no kexec were used here): When I try booting next-20250829 on my debian stable(trixie) amd64 system t= he boot process hangs every few attempts (without any log messages recorded). When = the boot process succeeds the following error message appears in dmesg: [ 8.337248] [ T44] ------------[ cut here ]------------ [ 8.337250] [ T44] WARNING: kernel/futex/core.c:1604 at futex_ref_rc= u+0xe8/0x100, CPU#6: rcuc/6/44 [ 8.337257] [ T44] Modules linked in: snd_seq_dummy snd_hrtimer snd_= seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device rfcomm bnep = nls_ascii nls_cp437 vfat fat snd_hda_codec_generic snd_hda_codec_atihdmi sn= d_hda_codec_hdmi snd_hda_intel btusb snd_intel_dspcfg snd_soc_dmic snd_acp3= x_pdm_dma snd_acp3x_rn snd_hda_codec btrtl uvcvideo snd_soc_core btintel sn= d_hda_core btbcm videobuf2_vmalloc btmtk videobuf2_memops snd_hwdep uvc vid= eobuf2_v4l2 snd_pcm_oss bluetooth videodev snd_mixer_oss snd_pcm snd_rn_pci= _acp3x snd_acp_config videobuf2_common snd_soc_acpi msi_wmi ecdh_generic ec= c mc sparse_keymap snd_timer edac_mce_amd wmi_bmof snd snd_pci_acp3x k10tem= p ccp soundcore battery ac button joydev hid_sensor_gyro_3d hid_sensor_acce= l_3d hid_sensor_prox hid_sensor_als hid_sensor_magn_3d hid_sensor_trigger i= ndustrialio_triggered_buffer kfifo_buf industrialio amd_pmc hid_sensor_iio_= common evdev mt7921e mt7921_common mt792x_lib mt76_connac_lib mt76 mac80211= libarc4 cfg80211 rfkill msr fuse nvme_fabrics efi_pstore configfs [ 8.337310] [ T44] efivarfs autofs4 ext4 mbcache jbd2 usbhid amdgpu= drm_client_lib i2c_algo_bit drm_ttm_helper ttm drm_panel_backlight_quirks = drm_exec drm_suballoc_helper drm_buddy gpu_sched xhci_pci amdxcp xhci_hcd h= id_sensor_hub psmouse drm_display_helper mfd_core hid_multitouch hid_generi= c drm_kms_helper i2c_hid_acpi serio_raw usbcore amd_sfh i2c_hid r8169 cec n= vme hid crc16 nvme_core i2c_piix4 usb_common i2c_smbus i2c_designware_platf= orm i2c_designware_core [ 8.337337] [ T44] CPU: 6 UID: 0 PID: 44 Comm: rcuc/6 Not tainted 6.= 17.0-rc3-next-20250829-master #215 PREEMPT_{RT,(full)}=20 [ 8.337340] [ T44] Hardware name: Micro-Star International Co., Ltd.= Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 [ 8.337342] [ T44] RIP: 0010:futex_ref_rcu+0xe8/0x100 [ 8.337344] [ T44] Code: be ff ff ff ff ff ff ff 7f 48 89 b3 88 01 0= 0 00 c7 00 01 00 00 00 48 8d bb 78 01 00 00 5b 48 c7 c6 70 d7 b4 a5 e9 78 7= a fd ff <0f> 0b eb ab 0f 0b e9 31 ff ff ff 0f 0b eb c6 66 0f 1f 84 00 00 00 [ 8.337346] [ T44] RSP: 0018:ffffb438402dfdb0 EFLAGS: 00010286 [ 8.337348] [ T44] RAX: 7fffffffffffffff RBX: ffff8aab87fa1900 RCX: = 0000000000000010 [ 8.337350] [ T44] RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: = 000000000000000f [ 8.337351] [ T44] RBP: ffff8aab80958000 R08: 0000000000000000 R09: = 0000000000000006 [ 8.337352] [ T44] R10: 0000000000220021 R11: 0000000000000000 R12: = ffff8aae5e7a2300 [ 8.337353] [ T44] R13: ffffb438402dfdf0 R14: 0000000000000016 R15: = 0000000000000000 [ 8.337354] [ T44] FS: 0000000000000000(0000) GS:ffff8aaeb79bc000(0= 000) knlGS:0000000000000000 [ 8.337356] [ T44] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.337357] [ T44] CR2: 00007fbce40135f8 CR3: 0000000108b48000 CR4: = 0000000000750ef0 [ 8.337358] [ T44] PKRU: 55555554 [ 8.337359] [ T44] Call Trace: [ 8.337361] [ T44] [ 8.337363] [ T44] rcu_do_batch+0x1b6/0x540 [ 8.337366] [ T44] ? rcu_do_batch+0x156/0x540 [ 8.337369] [ T44] rcu_core+0x141/0x250 [ 8.337371] [ T44] ? rcu_cpu_kthread+0x22/0xe0 [ 8.337373] [ T44] rcu_cpu_kthread+0x85/0xe0 [ 8.337375] [ T44] ? sort_range+0x20/0x20 [ 8.337378] [ T44] smpboot_thread_fn+0xd8/0x1d0 [ 8.337381] [ T44] kthread+0xe9/0x1e0 [ 8.337383] [ T44] ? kthreads_online_cpu+0x100/0x100 [ 8.337385] [ T44] ? kthreads_online_cpu+0x100/0x100 [ 8.337387] [ T44] ret_from_fork+0x18e/0x1c0 [ 8.337391] [ T44] ? kthreads_online_cpu+0x100/0x100 [ 8.337392] [ T44] ret_from_fork_asm+0x11/0x20 [ 8.337398] [ T44] [ 8.337398] [ T44] ---[ end trace 0000000000000000 ]--- Rebooting (normal reboot no kexec) also hangs sometimes and using netconsol= e I could capture the following error message: T124;------------[ cut here ]------------ T124;percpu ref (css_release) <=3D 0 (-1) after switching to atomic T124;WARNING: lib/percpu-refcount.c:197 at percpu_ref_switch_to_atomic_rcu+= 0x194/0x1a0, CPU#11: rcuc/11/124 T124,ncfrag=3D0/1022;Modules linked in: netconsole ccm snd_seq_dummy snd_hr= timer snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device rf= comm bnep nls_ascii nls_cp437 vfat fat snd_hda_codec_generic snd_hda_codec_= atihdmi snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_acp3x_pdm_dma= snd_soc_dmic snd_acp3x_rn btusb snd_hda_codec btrtl uvcvideo snd_soc_core = btintel snd_hda_core btbcm videobuf2_vmalloc btmtk snd_hwdep videobuf2_memo= ps snd_pcm_oss uvc videobuf2_v4l2 bluetooth snd_mixer_oss videodev snd_pcm = snd_rn_pci_acp3x snd_acp_config videobuf2_common snd_timer msi_wmi snd_soc_= acpi ecdh_generic ecc sparse_keymap mc snd wmi_bmof edac_mce_amd soundcore = k10temp snd_pci_acp3x ccp ac battery button joydev hid_sensor_gyro_3d hid_s= ensor_accel_3d hid_sensor_magn_3d hid_sensor_als hid_sensor_prox hid_sensor= _trigger industrialio_triggered_buffer kfifo_buf industrialio amd_pmc hid_s= ensor_iio_common evdev mt7921e mt7921_common mt792x_lib mt76_connac_lib mt7= 6=20 T124,ncfrag=3D956/1022;mac80211 libarc4 cfg80211 rfkill msr fuse nvme_fabri= cs efi_pstore T124; configfs efivarfs autofs4 ext4 mbcache jbd2 usbhid amdgpu drm_client_= lib i2c_algo_bit drm_ttm_helper ttm drm_panel_backlight_quirks drm_exec drm= _suballoc_helper drm_buddy gpu_sched xhci_pci amdxcp drm_display_helper xhc= i_hcd hid_sensor_hub hid_multitouch mfd_core hid_generic usbcore i2c_hid_ac= pi psmouse amd_sfh drm_kms_helper nvme i2c_hid hid serio_raw nvme_core cec = r8169 i2c_piix4 usb_common crc16 i2c_smbus i2c_designware_platform i2c_desi= gnware_core T124;CPU: 11 UID: 0 PID: 124 Comm: rcuc/11 Tainted: G W 6.= 17.0-rc3-next-20250829-master #215 PREEMPT_{RT,(full)}=20 T124;Tainted: [W]=3DWARN T124;Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-15= 8L, BIOS E158LAMS.10F 11/11/2024 T124;RIP: 0010:percpu_ref_switch_to_atomic_rcu+0x194/0x1a0 T124;Code: c0 83 f8 03 0f 8f 12 ff ff ff e9 a8 25 ba ff 48 8b 53 e0 48 8b 7= 3 e8 48 c7 c7 f0 1c 8c 8e c6 05 ec 7c a7 00 01 e8 3c a9 c1 ff <0f> 0b eb c4= 0f 1f 84 00 00 00 00 00 41 55 41 54 55 48 89 fd 53 48 T124;RSP: 0018:ffffb86540587da0 EFLAGS: 00010282 Aug 31 12:01:07 localhost 4,1297,74466412,-,caller=3DT124;RAX: 000000000000= 0000 RBX: ffff893620a67c60 RCX: 0000000000000027 T124;RDX: ffff8938de8d6d48 RSI: 0000000000000001 RDI: ffff8938de8d6d40 T124;RBP: 8000000000000001 R08: 0000000000000f15 R09: 00000000ffffffff T124;R10: 0000000000000001 R11: 0000000000000008 R12: ffff893620a67c40 T124;R13: ffffb86540587df0 R14: 000000000000001c R15: 0000000000000000 T124;FS: 0000000000000000(0000) GS:ffff89394f8fc000(0000) knlGS:0000000000= 000000 T124;CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 T124;CR2: 00007fa2fc9b8b60 CR3: 0000000107e89000 CR4: 0000000000750ef0 T124;PKRU: 55555554 T124;Call Trace: T124; T124; rcu_do_batch+0x1b6/0x540 T124; ? rcu_do_batch+0x156/0x540 T124; rcu_core+0x141/0x250 T124; ? rcu_cpu_kthread+0x22/0xe0 T124; rcu_cpu_kthread+0x85/0xe0 T124; ? sort_range+0x20/0x20 T124; smpboot_thread_fn+0xd8/0x1d0 T124; kthread+0xe9/0x1e0 T124; ? kthreads_online_cpu+0x100/0x100 T124; ? kthreads_online_cpu+0x100/0x100 T124; ret_from_fork+0x18e/0x1c0 T124; ? kthreads_online_cpu+0x100/0x100 T124; ret_from_fork_asm+0x11/0x20 T124; T124;---[ end trace 0000000000000000 ]--- T124;percpu_ref_switch_to_atomic_rcu: percpu_ref_switch_to_atomic_rcu(): pe= rcpu_ref underflow slab kmalloc-64 start ffff893620a67c40 pointer offset 0 = size 64 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -2 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 T153;unregister_netdevice: waiting for lo to become free. Usage count =3D -1 Both errors messages occur with and without PREEMPT_RT. I bisected this (between v6.17-rc3 and next-20250829) using the first error (WARNING: kernel/futex/core.c:1604) as signal for a bad commit. During the bisection some additional and more severe errors occured, I do not know yet if or how all these errors are linked: At commit e255111fdcae a NULL pointer dereference happened: [ 8.612505] [ T159] BUG: kernel NULL pointer dereference, address: 00= 00000000000020 [ 8.612508] [ T159] #PF: supervisor read access in kernel mode [ 8.612509] [ T159] #PF: error_code(0x0000) - not-present page [ 8.612511] [ T159] PGD 0 P4D 0=20 [ 8.612513] [ T159] Oops: Oops: 0000 [#1] SMP NOPTI [ 8.612517] [ T159] CPU: 8 UID: 0 PID: 159 Comm: kworker/u64:14 Taint= ed: G W 6.17.0-rc3-bisect-00614-ge255111fdcae #219 PREEMPT= _{RT,(full)}=20 [ 8.612521] [ T159] Tainted: [W]=3DWARN [ 8.612522] [ T159] Hardware name: Micro-Star International Co., Ltd.= Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 [ 8.612523] [ T159] Workqueue: events_unbound flush_memcg_stats_dwork [ 8.612528] [ T159] RIP: 0010:css_rstat_flush+0xe7/0x510 [ 8.612532] [ T159] Code: 48 01 d0 48 89 04 24 4d 63 fc 48 8b 3c 24 e= 8 00 02 31 00 48 89 c6 48 85 c0 74 69 48 89 00 48 8b 70 08 4a 8b 0c fd 80 2= c 74 82 <48> 8b 46 20 48 8b 96 b8 00 00 00 48 83 7c 01 08 00 48 8d 3c 08 74 [ 8.612534] [ T159] RSP: 0018:ffffa8ef806abdf8 EFLAGS: 00010282 [ 8.612536] [ T159] RAX: ffffc8ef7fbde7b0 RBX: ffff9ce2c0261380 RCX: = ffff9ce61ba00000 [ 8.612537] [ T159] RDX: ffffc8ef7fbde7b0 RSI: 0000000000000000 RDI: = ffff9ce59e7e7488 [ 8.612538] [ T159] RBP: 0000000000000007 R08: ffff9ce59e7a7478 R09: = ffff9ce2dbd30d00 [ 8.612539] [ T159] R10: 0000000000000028 R11: ffff9ce59e7a6e80 R12: = 0000000000000007 [ 8.612540] [ T159] R13: ffff9ce59e7e7490 R14: ffffffffffffffff R15: = 0000000000000007 [ 8.612541] [ T159] FS: 0000000000000000(0000) GS:ffff9ce61ba40000(0= 000) knlGS:0000000000000000 [ 8.612542] [ T159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.612544] [ T159] CR2: 0000000000000020 CR3: 00000001d5e22000 CR4: = 0000000000750ef0 [ 8.612545] [ T159] PKRU: 55555554 [ 8.612545] [ T159] Call Trace: [ 8.612547] [ T159] [ 8.612550] [ T159] flush_memcg_stats_dwork+0x37/0x60 [ 8.612552] [ T159] process_one_work+0x17b/0x290 [ 8.612557] [ T159] worker_thread+0x2ca/0x400 [ 8.612560] [ T159] ? rescuer_thread+0x4f0/0x4f0 [ 8.612562] [ T159] kthread+0xe9/0x1e0 [ 8.612564] [ T159] ? kthreads_online_cpu+0x100/0x100 [ 8.612566] [ T159] ? kthreads_online_cpu+0x100/0x100 [ 8.612568] [ T159] ret_from_fork+0x18e/0x1c0 [ 8.612571] [ T159] ? kthreads_online_cpu+0x100/0x100 [ 8.612573] [ T159] ret_from_fork_asm+0x11/0x20 [ 8.612578] [ T159] [ 8.612579] [ T159] Modules linked in: snd_seq_dummy snd_hrtimer snd_= seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device rfcomm bnep = nls_ascii nls_cp437 vfat fat snd_hda_codec_generic snd_hda_codec_atihdmi sn= d_hda_codec_hdmi btusb snd_hda_intel btrtl snd_intel_dspcfg btintel uvcvide= o snd_hda_codec btbcm btmtk snd_soc_dmic snd_acp3x_pdm_dma snd_acp3x_rn vid= eobuf2_vmalloc snd_soc_core snd_hda_core videobuf2_memops uvc snd_hwdep vid= eobuf2_v4l2 bluetooth snd_pcm_oss videodev snd_mixer_oss snd_pcm snd_rn_pci= _acp3x snd_acp_config videobuf2_common snd_timer snd_soc_acpi msi_wmi ecdh_= generic ecc sparse_keymap mc snd wmi_bmof edac_mce_amd k10temp soundcore cc= p snd_pci_acp3x battery ac button hid_sensor_gyro_3d hid_sensor_accel_3d hi= d_sensor_prox hid_sensor_magn_3d hid_sensor_als joydev hid_sensor_trigger i= ndustrialio_triggered_buffer kfifo_buf industrialio amd_pmc evdev hid_senso= r_iio_common mt7921e mt7921_common mt792x_lib mt76_connac_lib mt76 mac80211= libarc4 cfg80211 rfkill msr nvme_fabrics fuse configfs efi_pstore [ 8.612632] [ T159] efivarfs autofs4 ext4 mbcache jbd2 usbhid amdgpu= drm_client_lib i2c_algo_bit drm_ttm_helper ttm drm_panel_backlight_quirks = drm_exec drm_suballoc_helper amdxcp drm_buddy xhci_pci gpu_sched xhci_hcd d= rm_display_helper hid_sensor_hub hid_multitouch mfd_core hid_generic i2c_hi= d_acpi psmouse usbcore drm_kms_helper nvme amd_sfh i2c_hid hid serio_raw ce= c i2c_piix4 nvme_core r8169 i2c_smbus usb_common crc16 i2c_designware_platf= orm i2c_designware_core [ 8.612658] [ T159] CR2: 0000000000000020 [ 8.612660] [ T159] ---[ end trace 0000000000000000 ]--- [ 8.733174] [ T159] RIP: 0010:css_rstat_flush+0xe7/0x510 [ 8.733174] [ T159] Code: 48 01 d0 48 89 04 24 4d 63 fc 48 8b 3c 24 e= 8 00 02 31 00 48 89 c6 48 85 c0 74 69 48 89 00 48 8b 70 08 4a 8b 0c fd 80 2= c 74 82 <48> 8b 46 20 48 8b 96 b8 00 00 00 48 83 7c 01 08 00 48 8d 3c 08 74 [ 8.733174] [ T159] RSP: 0018:ffffa8ef806abdf8 EFLAGS: 00010282 [ 8.733174] [ T159] RAX: ffffc8ef7fbde7b0 RBX: ffff9ce2c0261380 RCX: = ffff9ce61ba00000 [ 8.733174] [ T159] RDX: ffffc8ef7fbde7b0 RSI: 0000000000000000 RDI: = ffff9ce59e7e7488 [ 8.733174] [ T159] RBP: 0000000000000007 R08: ffff9ce59e7a7478 R09: = ffff9ce2dbd30d00 [ 8.733174] [ T159] R10: 0000000000000028 R11: ffff9ce59e7a6e80 R12: = 0000000000000007 [ 8.733174] [ T159] R13: ffff9ce59e7e7490 R14: ffffffffffffffff R15: = 0000000000000007 [ 8.733174] [ T159] FS: 0000000000000000(0000) GS:ffff9ce61ba40000(0= 000) knlGS:0000000000000000 [ 8.739103] [ T159] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.739103] [ T159] CR2: 0000000000000020 CR3: 00000001d5e22000 CR4: = 0000000000750ef0 [ 8.739103] [ T159] PKRU: 55555554 At commit 4d8bb6e8f4a2 a bad rss-counter state appeared (CCing akpm due to = the rss-counter state): [ 7.370238] [ T84] BUG: Bad rss-counter state mm:000000007094a157 ty= pe:MM_FILEPAGES val:-14 Comm:rcuc/1 Pid:84 [ 7.370244] [ T84] BUG: Bad rss-counter state mm:000000007094a157 ty= pe:MM_ANONPAGES val:1 Comm:rcuc/1 Pid:84 [ 7.384238] [ T100] BUG: Bad rss-counter state mm:000000007369ddda ty= pe:MM_FILEPAGES val:-11 Comm:rcuc/5 Pid:100 [ 7.384241] [ T100] BUG: Bad rss-counter state mm:000000007369ddda ty= pe:MM_ANONPAGES val:-28 Comm:rcuc/5 Pid:100 [ 7.396237] [ T76] BUG: Bad rss-counter state mm:0000000088a6974c ty= pe:MM_FILEPAGES val:-3 Comm:rcuc/14 Pid:76 [ 7.396241] [ T76] BUG: Bad rss-counter state mm:0000000088a6974c ty= pe:MM_SWAPENTS val:48 Comm:rcuc/14 Pid:76 [ 7.396243] [ T76] BUG: Bad rss-counter state mm:0000000088a6974c ty= pe:MM_SHMEMPAGES val:-1 Comm:rcuc/14 Pid:76 [ 7.414298] [ T108] ------------[ cut here ]------------ [ 7.414300] [ T108] percpu ref (cgroup_bpf_release_fn) <=3D 0 (-1) af= ter switching to atomic [ 7.414309] [ T108] WARNING: CPU: 7 PID: 108 at lib/percpu-refcount.c= :197 percpu_ref_switch_to_atomic_rcu+0x194/0x1a0 [ 7.414315] [ T108] Modules linked in: rfcomm bnep nls_ascii nls_cp43= 7 vfat fat snd_hda_codec_generic snd_hda_codec_atihdmi snd_hda_codec_hdmi s= nd_hda_intel snd_intel_dspcfg btusb snd_hda_codec btrtl btintel uvcvideo bt= bcm snd_acp3x_pdm_dma snd_soc_dmic snd_acp3x_rn snd_hda_core btmtk snd_soc_= core snd_hwdep videobuf2_vmalloc videobuf2_memops snd_pcm_oss uvc videobuf2= _v4l2 bluetooth snd_mixer_oss videodev snd_pcm snd_rn_pci_acp3x snd_acp_con= fig snd_timer videobuf2_common snd_soc_acpi msi_wmi ecdh_generic ecc sparse= _keymap mc wmi_bmof edac_mce_amd snd snd_pci_acp3x k10temp soundcore ccp ba= ttery ac button joydev hid_sensor_accel_3d hid_sensor_gyro_3d hid_sensor_al= s hid_sensor_prox hid_sensor_magn_3d hid_sensor_trigger industrialio_trigge= red_buffer kfifo_buf amd_pmc industrialio hid_sensor_iio_common evdev mt792= 1e mt7921_common mt792x_lib mt76_connac_lib mt76 mac80211 libarc4 cfg80211 = rfkill msr fuse nvme_fabrics efi_pstore configfs efivarfs autofs4 ext4 mbca= che jbd2 usbhid amdgpu drm_client_lib i2c_algo_bit drm_ttm_helper ttm [ 7.414370] [ T108] drm_panel_backlight_quirks drm_exec xhci_pci drm= _suballoc_helper amdxcp xhci_hcd drm_buddy hid_multitouch gpu_sched hid_sen= sor_hub mfd_core hid_generic drm_display_helper i2c_hid_acpi nvme amd_sfh i= 2c_hid drm_kms_helper usbcore psmouse hid nvme_core r8169 cec serio_raw i2c= _piix4 usb_common i2c_smbus crc16 i2c_designware_platform i2c_designware_co= re [ 7.414390] [ T108] CPU: 7 UID: 0 PID: 108 Comm: rcuc/7 Not tainted 6= .17.0-rc3-bisect-00368-g4d8bb6e8f4a2 #222 PREEMPT_{RT,(full)}=20 [ 7.414393] [ T108] Hardware name: Micro-Star International Co., Ltd.= Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 [ 7.414394] [ T108] RIP: 0010:percpu_ref_switch_to_atomic_rcu+0x194/0= x1a0 [ 7.414397] [ T108] Code: c0 83 f8 03 0f 8f 12 ff ff ff e9 08 77 ba f= f 48 8b 53 e0 48 8b 73 e8 48 c7 c7 a8 ef 2b b8 c6 05 0c cd a7 00 01 e8 fc e= b c1 ff <0f> 0b eb c4 0f 1f 84 00 00 00 00 00 41 55 41 54 55 48 89 fd 53 48 [ 7.414399] [ T108] RSP: 0018:ffff9fff804ffda0 EFLAGS: 00010282 [ 7.414401] [ T108] RAX: 0000000000000000 RBX: ffff8df6a5583660 RCX: = 0000000000000027 [ 7.414402] [ T108] RDX: ffff8df95e7d6d48 RSI: 0000000000000001 RDI: = ffff8df95e7d6d40 [ 7.414403] [ T108] RBP: 7ffffffffffffffe R08: 0000000000000dcb R09: = 00000000ffffffff [ 7.414405] [ T108] R10: 0000000000000001 R11: 0000000000000008 R12: = ffff8df6a5583640 [ 7.414406] [ T108] R13: ffff9fff804ffdf0 R14: 00000000000000b4 R15: = 0000000000000000 [ 7.414407] [ T108] FS: 0000000000000000(0000) GS:ffff8df9a5e00000(0= 000) knlGS:0000000000000000 [ 7.414408] [ T108] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 7.414409] [ T108] CR2: 000055a8070e5908 CR3: 0000000101a48000 CR4: = 0000000000750ef0 [ 7.414411] [ T108] PKRU: 55555554 [ 7.414411] [ T108] Call Trace: [ 7.414413] [ T108] [ 7.414415] [ T108] rcu_do_batch+0x1b6/0x540 [ 7.414420] [ T108] ? rcu_do_batch+0x156/0x540 [ 7.414424] [ T108] rcu_core+0x141/0x250 [ 7.414426] [ T108] ? rcu_cpu_kthread+0x22/0xe0 [ 7.414428] [ T108] rcu_cpu_kthread+0x85/0xe0 [ 7.414431] [ T108] ? sort_range+0x20/0x20 [ 7.414432] [ T108] smpboot_thread_fn+0xd8/0x1d0 [ 7.414434] [ T108] kthread+0xe9/0x1e0 [ 7.414437] [ T108] ? kthreads_online_cpu+0x100/0x100 [ 7.414438] [ T108] ? kthreads_online_cpu+0x100/0x100 [ 7.414441] [ T108] ret_from_fork+0x18e/0x1c0 [ 7.414444] [ T108] ? kthreads_online_cpu+0x100/0x100 [ 7.414446] [ T108] ret_from_fork_asm+0x11/0x20 [ 7.414451] [ T108] [ 7.414452] [ T108] ---[ end trace 0000000000000000 ]--- [ 7.414453] [ T108] percpu_ref_switch_to_atomic_rcu: percpu_ref_switc= h_to_atomic_rcu(): percpu_ref underflow slab kmalloc-64 start ffff8df6a5583= 640 pointer offset 0 size 64 [ 8.255241] [ T124] ------------[ cut here ]------------ [ 8.255243] [ T124] WARNING: CPU: 11 PID: 124 at kernel/futex/core.c:= 1604 futex_ref_rcu+0xe8/0x100 [ 8.255249] [ T124] Modules linked in: snd_hrtimer snd_seq_midi snd_s= eq_midi_event snd_rawmidi snd_seq snd_seq_device rfcomm bnep nls_ascii nls_= cp437 vfat fat snd_hda_codec_generic snd_hda_codec_atihdmi snd_hda_codec_hd= mi snd_hda_intel snd_intel_dspcfg btusb snd_hda_codec btrtl btintel uvcvide= o btbcm snd_acp3x_pdm_dma snd_soc_dmic snd_acp3x_rn snd_hda_core btmtk snd_= soc_core snd_hwdep videobuf2_vmalloc videobuf2_memops snd_pcm_oss uvc video= buf2_v4l2 bluetooth snd_mixer_oss videodev snd_pcm snd_rn_pci_acp3x snd_acp= _config snd_timer videobuf2_common snd_soc_acpi msi_wmi ecdh_generic ecc sp= arse_keymap mc wmi_bmof edac_mce_amd snd snd_pci_acp3x k10temp soundcore cc= p battery ac button joydev hid_sensor_accel_3d hid_sensor_gyro_3d hid_senso= r_als hid_sensor_prox hid_sensor_magn_3d hid_sensor_trigger industrialio_tr= iggered_buffer kfifo_buf amd_pmc industrialio hid_sensor_iio_common evdev m= t7921e mt7921_common mt792x_lib mt76_connac_lib mt76 mac80211 libarc4 cfg80= 211 rfkill msr fuse nvme_fabrics efi_pstore configfs efivarfs autofs4 [ 8.255293] [ T124] ext4 mbcache jbd2 usbhid amdgpu drm_client_lib i= 2c_algo_bit drm_ttm_helper ttm drm_panel_backlight_quirks drm_exec xhci_pci= drm_suballoc_helper amdxcp xhci_hcd drm_buddy hid_multitouch gpu_sched hid= _sensor_hub mfd_core hid_generic drm_display_helper i2c_hid_acpi nvme amd_s= fh i2c_hid drm_kms_helper usbcore psmouse hid nvme_core r8169 cec serio_raw= i2c_piix4 usb_common i2c_smbus crc16 i2c_designware_platform i2c_designwar= e_core [ 8.255314] [ T124] CPU: 11 UID: 0 PID: 124 Comm: rcuc/11 Tainted: G = W 6.17.0-rc3-bisect-00368-g4d8bb6e8f4a2 #222 PREEMPT_{RT,(= full)}=20 [ 8.255317] [ T124] Tainted: [W]=3DWARN [ 8.255317] [ T124] Hardware name: Micro-Star International Co., Ltd.= Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 [ 8.255318] [ T124] RIP: 0010:futex_ref_rcu+0xe8/0x100 [ 8.255321] [ T124] Code: be ff ff ff ff ff ff ff 7f 48 89 b3 88 01 0= 0 00 c7 00 01 00 00 00 48 8d bb 78 01 00 00 5b 48 c7 c6 f0 c5 74 b7 e9 f8 7= a fd ff <0f> 0b eb ab 0f 0b e9 31 ff ff ff 0f 0b eb c6 66 0f 1f 84 00 00 00 [ 8.255322] [ T124] RSP: 0018:ffff9fff80587db0 EFLAGS: 00010286 [ 8.255324] [ T124] RAX: 7fffffffffffffff RBX: ffff8df6a02bbe80 RCX: = 0000000000000010 [ 8.255325] [ T124] RDX: ffffffffffffffff RSI: ffffffffffffffff RDI: = 000000000000000f [ 8.255326] [ T124] RBP: ffff8df680b4a000 R08: 0000000000000000 R09: = 0000000000000005 [ 8.255327] [ T124] R10: 0000000000200017 R11: 0000000000000000 R12: = ffff8df95e8e2300 [ 8.255327] [ T124] R13: ffff9fff80587df0 R14: 0000000000000007 R15: = 0000000000000000 [ 8.255328] [ T124] FS: 0000000000000000(0000) GS:ffff8df9a5f00000(0= 000) knlGS:0000000000000000 [ 8.255330] [ T124] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.255331] [ T124] CR2: 0000561aa64a1020 CR3: 00000001209dd000 CR4: = 0000000000750ef0 [ 8.255331] [ T124] PKRU: 55555554 [ 8.255332] [ T124] Call Trace: [ 8.255334] [ T124] [ 8.255335] [ T124] rcu_do_batch+0x1b6/0x540 [ 8.255339] [ T124] ? rcu_do_batch+0x156/0x540 [ 8.255342] [ T124] rcu_core+0x141/0x250 [ 8.255344] [ T124] ? rcu_cpu_kthread+0x22/0xe0 [ 8.255345] [ T124] rcu_cpu_kthread+0x85/0xe0 [ 8.255347] [ T124] ? sort_range+0x20/0x20 [ 8.255349] [ T124] smpboot_thread_fn+0xd8/0x1d0 [ 8.255351] [ T124] kthread+0xe9/0x1e0 [ 8.255354] [ T124] ? kthreads_online_cpu+0x100/0x100 [ 8.255355] [ T124] ret_from_fork+0x18e/0x1c0 [ 8.255358] [ T124] ? kthreads_online_cpu+0x100/0x100 [ 8.255360] [ T124] ret_from_fork_asm+0x11/0x20 [ 8.255364] [ T124] [ 8.255365] [ T124] ---[ end trace 0000000000000000 ]--- The result of the bisection was this as the first bad commit: 1b708b38414d ("futex: Move futex_hash_free() back to __mmput()") I reverted commit 1b708b38414d in next-20250829 and all the errors disappea= red, but do not know yet how all these errors are linked. Bert Karwatzki