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Sun, 03 Aug 2025 15:14:44 -0700 (PDT) Date: Sun, 3 Aug 2025 23:14:42 +0100 From: Chris Bainbridge To: linux-kernel@vger.kernel.org Cc: surenb@google.com, bsegall@google.com, dietmar.eggemann@arm.com, mingo@redhat.com, hannes@cmpxchg.org, juri.lelli@redhat.com, mgorman@suse.de, peterz@infradead.org, rostedt@goodmis.org, vschneid@redhat.com, vincent.guittot@linaro.org, regressions@lists.linux.dev Subject: [REGRESSION] intermittent psi_avgs_work soft lockup Message-ID: Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hello, I'm getting intermittent soft lockups with recent kernel builds. This is a new error that I haven't seen before. An example lockup from 6.16.0-08685-g260f6f4fda93: [39389.154516] iwlwifi 0000:01:00.0: Queue 3 is stuck 4977 5129 [39400.400429] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [kworker/2= :1:1751316] [39400.400433] Modules linked in: snd_seq_dummy snd_hrtimer snd_seq xt_conn= track nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack = nf_defrag_ipv6 nf_defrag_ipv4 xfrm_user xfrm_algo xt_addrtype nft_compat x_= tables nf_tables br_netfilter bridge stp llc ccm overlay qrtr rfcomm cmac a= lgif_hash algif_skcipher af_alg bnep binfmt_misc ext4 mbcache jbd2 nls_asci= i nls_cp437 vfat fat snd_hda_codec_generic snd_hda_codec_hdmi intel_rapl_ms= r intel_rapl_common iwlmvm snd_hda_intel snd_acp3x_pdm_dma snd_soc_dmic snd= _acp3x_rn kvm_amd snd_hda_codec uvcvideo snd_soc_core mac80211 snd_usb_audi= o btusb snd_intel_dspcfg snd_compress videobuf2_vmalloc snd_usbmidi_lib btr= tl libarc4 videobuf2_memops kvm snd_rawmidi snd_hwdep snd_pci_acp6x btintel= uvc snd_seq_device snd_hda_core snd_pci_acp5x btbcm videobuf2_v4l2 irqbypa= ss snd_pcm btmtk iwlwifi snd_rn_pci_acp3x sg videodev rapl snd_timer videob= uf2_common wmi_bmof ee1004 snd_acp_config pcspkr bluetooth cfg80211 snd_soc= _acpi k10temp snd mc snd_pci_acp3x soundcore ccp rfkill ac [39400.400478] battery acpi_tad amd_pmc joydev evdev msr parport_pc ppdev = lp parport efi_pstore fuse nvme_fabrics configfs nfnetlink efivarfs autofs4= crc32c_cryptoapi btrfs blake2b_generic xor raid6_pq hid_microsoft ff_memle= ss hid_cmedia r8153_ecm cdc_ether usbnet r8152 mii libphy mdio_bus usbhid d= m_crypt dm_mod sd_mod uas usb_storage scsi_mod scsi_common amdgpu drm_clien= t_lib i2c_algo_bit drm_ttm_helper ttm drm_panel_backlight_quirks drm_exec d= rm_suballoc_helper amdxcp drm_buddy gpu_sched hid_multitouch drm_display_he= lper ucsi_acpi hid_generic drm_kms_helper typec_ucsi sp5100_tco roles xhci_= pci cec i2c_hid_acpi watchdog typec xhci_hcd amd_sfh i2c_hid rc_core nvme i= 2c_piix4 thunderbolt video usbcore ghash_clmulni_intel serio_raw hid crc16 = nvme_core fan i2c_smbus usb_common button wmi drm aesni_intel [39400.400514] irq event stamp: 28884 [39400.400515] hardirqs last enabled at (28883): [] asm_= sysvec_apic_timer_interrupt+0x16/0x20 [39400.400521] hardirqs last disabled at (28884): [] sysv= ec_apic_timer_interrupt+0xa/0xc0 [39400.400526] softirqs last enabled at (28882): [] __ir= q_exit_rcu+0xcd/0x140 [39400.400530] softirqs last disabled at (28877): [] __ir= q_exit_rcu+0xcd/0x140 [39400.400533] CPU: 2 UID: 0 PID: 1751316 Comm: kworker/2:1 Not tainted 6.1= 6.0-08685-g260f6f4fda93 #489 PREEMPT(voluntary) [39400.400535] Hardware name: HP HP Pavilion Aero Laptop 13-be0xxx/8916, BI= OS F.17 12/18/2024 [39400.400537] Workqueue: events psi_avgs_work [39400.400541] RIP: 0010:collect_percpu_times+0x2d5/0x440 [39400.400543] Code: 00 00 00 00 00 41 8b 0c 94 48 0f af c8 48 01 4c d5 00 = 48 83 c2 01 48 83 fa 06 75 e9 8d 53 01 e9 aa fd ff ff f3 90 48 8b 3c 24 <48= > 8b 14 fd 20 d0 6d b7 48 01 c2 8b 12 f6 c2 01 0f 84 ab fe ff ff [39400.400545] RSP: 0018:ffffc06b07823cf8 EFLAGS: 00000202 [39400.400546] RAX: ffffffffb82abc80 RBX: ffffe06aff48f440 RCX: 00000000000= 00006 [39400.400548] RDX: 00000000000014b7 RSI: ffffffffb76b7293 RDI: 00000000000= 0000d [39400.400548] RBP: ffffc06b07823d70 R08: 0000000000000001 R09: 00000000000= 00000 [39400.400549] R10: 0000000000000001 R11: 0000000000000003 R12: ffffc06b078= 23d50 [39400.400550] R13: ffffe06aff48f454 R14: 000000000000000d R15: ffffffffb82= abc80 [39400.400551] FS: 0000000000000000(0000) GS:ffff9d9f4e072000(0000) knlGS:= 0000000000000000 [39400.400552] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [39400.400553] CR2: 00000c2100382000 CR3: 0000000387c3b000 CR4: 00000000007= 50ef0 [39400.400554] PKRU: 55555554 [39400.400555] Call Trace: [39400.400557] [39400.400571] psi_avgs_work+0x56/0xe0 [39400.400576] process_one_work+0x22b/0x5b0 [39400.400588] worker_thread+0x1d6/0x3c0 [39400.400592] ? bh_worker+0x260/0x260 [39400.400594] kthread+0x115/0x260 [39400.400599] ? kthreads_online_cpu+0x120/0x120 [39400.400603] ret_from_fork+0x231/0x2a0 [39400.400606] ? kthreads_online_cpu+0x120/0x120 [39400.400610] ret_from_fork_asm+0x11/0x20 [39400.400621] [39400.404429] watchdog: BUG: soft lockup - CPU#4 stuck for 21s! [kworker/4= :0:1751752] It appears to happen randomly when I have been away from the laptop for some time and return, or sometimes if I leave it overnight. It also looks like it occurs on 2% of system boots. Bisecting with such a low failure probability takes a long time. I haven't identified the bad commit yet, but I think I have narrowed it down to between v6.16-rc6 (good) and v6.16-rc6-79-g44e4e0297c3c (bad). At this rate, I should have a more exact bisect result within a week. #regzbot introduced: v6.16-rc6..v6.16-rc6-79-g44e4e0297c3c