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Message-ID: <CAH2r5muJ4raSHGUh4Rk1jDuvBsEmkJ4aFd3BYGA9V5hUY9CxmA@mail.gmail.com> Date: Fri, 1 Aug 2025 14:01:22 -0500 From: Steve French <smfrench@...il.com> To: LKML <linux-kernel@...r.kernel.org> Cc: Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org Subject: [BUG] soft lockup in psi_avgs_work() / collect_percpu_times() on 6.17-rc Running xfstests against current mainline from yesterday I see the following soft lockup during xfstest generic/211 [Fri Aug 1 13:33:48 2025] watchdog: BUG: soft lockup - CPU#6 stuck for 22s! [kworker/6:5:58759] [Fri Aug 1 13:33:48 2025] Modules linked in: cifs(E) cmac(E) nls_utf8(E) cifs_arc4(E) nls_ucs2_utils(E) cifs_md4(E) rpcsec_gss_krb5(E) auth_rpcgss(E) nfsv4(E) dns_resolver(E) nfs(E) lockd(E) grace(E) netfs(E) nf_conntrack_netbios_ns(E) nf_conntrack_broadcast(E) nft_fib_inet(E) nft_fib_ipv4(E) nft_fib_ipv6(E) nft_fib(E) nft_reject_inet(E) nf_reject_ipv4(E) nf_reject_ipv6(E) nft_reject(E) nft_ct(E) nft_chain_nat(E) nf_nat(E) nf_conntrack(E) nf_defrag_ipv6(E) nf_defrag_ipv4(E) nf_tables(E) ip_set(E) sunrpc(E) kvm_intel(E) kvm(E) irqbypass(E) virtio_net(E) net_failover(E) failover(E) virtio_balloon(E) loop(E) fuse(E) dm_multipath(E) nfnetlink(E) zram(E) xfs(E) bochs(E) drm_client_lib(E) drm_shmem_helper(E) drm_kms_helper(E) virtio_blk(E) ghash_clmulni_intel(E) drm(E) floppy(E) qemu_fw_cfg(E) virtio_console(E) [last unloaded: cifs(E)] [Fri Aug 1 13:33:48 2025] irq event stamp: 275924 [Fri Aug 1 13:33:48 2025] hardirqs last enabled at (275923): [<ffffffff950015ca>] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [Fri Aug 1 13:33:48 2025] hardirqs last disabled at (275924): [<ffffffff969a7fef>] sysvec_apic_timer_interrupt+0xf/0x90 [Fri Aug 1 13:33:48 2025] softirqs last enabled at (275922): [<ffffffff95325785>] __irq_exit_rcu+0x135/0x160 [Fri Aug 1 13:33:48 2025] softirqs last disabled at (275905): [<ffffffff95325785>] __irq_exit_rcu+0x135/0x160 [Fri Aug 1 13:33:48 2025] CPU: 6 UID: 0 PID: 58759 Comm: kworker/6:5 Tainted: G E 6.16.0 #1 PREEMPT(voluntary) [Fri Aug 1 13:33:48 2025] Tainted: [E]=UNSIGNED_MODULE [Fri Aug 1 13:33:48 2025] Hardware name: Red Hat KVM, BIOS 1.16.3-4.el9 04/01/2014 [Fri Aug 1 13:33:48 2025] Workqueue: events psi_avgs_work [Fri Aug 1 13:33:48 2025] RIP: 0010:collect_percpu_times+0x4c7/0x540 [Fri Aug 1 13:33:48 2025] Code: 00 00 00 c7 40 0c 00 00 00 00 48 c7 40 14 00 00 00 00 48 81 c4 68 01 00 00 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc f3 90 <4c> 89 ef e8 91 3b 49 00 48 8b 44 24 08 4c 8b 74 24 20 e9 15 fd ff [Fri Aug 1 13:33:48 2025] RSP: 0018:ff110001370a7ae8 EFLAGS: 00000202 [Fri Aug 1 13:33:48 2025] RAX: 0000000000000000 RBX: ffd1ffffffd1f740 RCX: dffffc0000000000 [Fri Aug 1 13:33:48 2025] RDX: 0000000000000003 RSI: 0000000000000000 RDI: ff110004cb32cec0 [Fri Aug 1 13:33:48 2025] RBP: ffffffff98e09ec0 R08: ffffffff953e5db3 R09: 0000000000000001 [Fri Aug 1 13:33:48 2025] R10: ffffffff97fe80e7 R11: 0000000000000000 R12: 0000000000000006 [Fri Aug 1 13:33:48 2025] R13: ffffffff97479050 R14: 000000000001e72b R15: ff110001370a7bb0 [Fri Aug 1 13:33:48 2025] FS: 0000000000000000(0000) GS:ff11000532523000(0000) knlGS:0000000000000000 [Fri Aug 1 13:33:48 2025] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Fri Aug 1 13:33:48 2025] CR2: 00007fd174c8cc58 CR3: 0000000119668001 CR4: 0000000000373ef0 [Fri Aug 1 13:33:48 2025] Call Trace: [Fri Aug 1 13:33:48 2025] <TASK> [Fri Aug 1 13:33:48 2025] ? __pfx_collect_percpu_times+0x10/0x10 [Fri Aug 1 13:33:48 2025] psi_avgs_work+0x89/0x140 [Fri Aug 1 13:33:48 2025] ? __pfx_psi_avgs_work+0x10/0x10 [Fri Aug 1 13:33:48 2025] ? lock_release+0xc4/0x270 [Fri Aug 1 13:33:48 2025] ? rcu_is_watching+0x20/0x50 [Fri Aug 1 13:33:48 2025] process_one_work+0x4bf/0xb40 [Fri Aug 1 13:33:48 2025] ? lock_acquire+0x143/0x2d0 [Fri Aug 1 13:33:48 2025] ? __pfx_process_one_work+0x10/0x10 [Fri Aug 1 13:33:48 2025] ? assign_work+0xd6/0x110 [Fri Aug 1 13:33:48 2025] worker_thread+0x2c9/0x550 [Fri Aug 1 13:33:48 2025] ? __pfx_worker_thread+0x10/0x10 [Fri Aug 1 13:33:48 2025] kthread+0x216/0x3e0 [Fri Aug 1 13:33:48 2025] ? __pfx_kthread+0x10/0x10 [Fri Aug 1 13:33:48 2025] ? __pfx_kthread+0x10/0x10 [Fri Aug 1 13:33:48 2025] ? lock_release+0xc4/0x270 [Fri Aug 1 13:33:48 2025] ? rcu_is_watching+0x20/0x50 [Fri Aug 1 13:33:48 2025] ? __pfx_kthread+0x10/0x10 [Fri Aug 1 13:33:48 2025] ret_from_fork+0x23a/0x2e0 [Fri Aug 1 13:33:48 2025] ? __pfx_kthread+0x10/0x10 [Fri Aug 1 13:33:48 2025] ret_from_fork_asm+0x1a/0x30 [Fri Aug 1 13:33:48 2025] </TASK> -- Thanks, Steve
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