rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (7 ticks this GP) idle=cf94/1/0x4000000000000000 softirq=57386/57388 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P15056/1:b..l rcu: (detected by 1, t=10506 jiffies, g=60673, q=55 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15066 Comm: syz.5.2577 Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:advance_sched+0x51c/0xca0 net/sched/sch_taprio.c:961 Code: 00 48 89 44 24 38 44 89 e0 48 8d 6b 80 48 ff c8 48 89 84 24 90 00 00 00 45 31 ff 49 bc 00 00 00 00 00 fc ff df 4c 89 74 24 28 10 00 00 00 4c 89 fe e8 e7 23 d0 f7 49 83 ff 0f 48 89 6c 24 40 RSP: 0018:ffffc90000007c70 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffff888079207940 RCX: ffff888079207940 RDX: ffff888031f0da00 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffff8880792078c0 R08: ffffffff89ef3e6f R09: fffff52000000f7c R10: dffffc0000000000 R11: fffff52000000f7c R12: dffffc0000000000 R13: 18297f6178000000 R14: ffff888079207800 R15: 0000000000000000 FS: 00007fbd9420f6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003c80 CR3: 0000000065db6000 CR4: 00000000003526f0 DR0: 0000000000000006 DR1: 0000000000003609 DR2: 000000000000029f DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x59b/0xd30 kernel/time/hrtimer.c:1865 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:raw_spin_rq_unlock_irq+0x19/0x90 kernel/sched/sched.h:1534 Code: 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 48 89 fb eb 18 48 89 df e8 fe e7 60 0a e8 39 5e 37 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc f3 0f 1e fa 49 bf 00 00 00 00 00 fc ff RSP: 0018:ffffc90003cc7988 EFLAGS: 00000282 RAX: 5301b510b4e09400 RBX: ffff8880b863e7c0 RCX: ffffffff9a3ca903 RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: ffffffff8c5fb600 RBP: ffffc90003cc7b90 R08: ffffffff901a2877 R09: 1ffffffff203450e R10: dffffc0000000000 R11: fffffbfff203450f R12: ffff8880280782d0 R13: 1ffff110170c7ebb R14: ffff8880b863f5f0 R15: dffffc0000000000 __schedule+0x1a75/0x4c40 kernel/sched/core.c:6768 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7086 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:futex_wake+0x0/0x5c0 kernel/futex/waitwake.c:156 Code: 5d 41 5e 41 5f 5d e9 bf 15 2e 03 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc90003cc7d18 EFLAGS: 00000297 RAX: 0000000000000004 RBX: 1ffff92000798fac RCX: 00000000ffffffff RDX: 00000000000f4240 RSI: 0000000000000002 RDI: 00007fbd935a608c RBP: ffffc90003cc7de8 R08: 0000000000000005 R09: ffffffff81b23582 R10: 000000000000000d R11: ffff888031f0da00 R12: 0000000000000001 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000002 do_futex+0x392/0x560 kernel/futex/syscalls.c:107 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbd9338cde9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbd9420f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fbd935a6088 RCX: 00007fbd9338cde9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbd935a608c RBP: 00007fbd935a6080 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd935a608c R13: 0000000000000000 R14: 00007ffcb736ff00 R15: 00007ffcb736ffe8 task:syz.0.2574 state:R running task stack:23392 pid:15056 tgid:15047 ppid:5828 task_flags:0x400040 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7086 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707 RIP: 0010:pmdp_get include/linux/pgtable.h:345 [inline] RIP: 0010:pmdp_get_lockless include/linux/pgtable.h:622 [inline] RIP: 0010:___pte_offset_map+0x13c/0x380 mm/pgtable-generic.c:289 Code: c2 e0 c2 15 8c e8 e4 63 8b ff 48 8d 5c 24 40 4c 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 ef e8 59 b3 13 00 4c 89 6c 24 10 <4d> 8b 6d 00 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 RSP: 0000:ffffc9000baa7140 EFLAGS: 00000246 RAX: 1ffff1100ca1e202 RBX: ffffc9000baa7180 RCX: 0000000000080000 RDX: ffffc9000bd41000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000baa71f0 R08: ffffffff820fbb12 R09: 1ffffffff2858708 R10: dffffc0000000000 R11: fffffbfff2858709 R12: 1ffff92001754e2c R13: ffff8880650f1010 R14: dffffc0000000000 R15: ffffc9000baa7280 __pte_offset_map include/linux/mm.h:3032 [inline] __pte_offset_map_lock+0xc7/0x300 mm/pgtable-generic.c:398 pte_offset_map_lock include/linux/mm.h:3047 [inline] finish_fault+0x707/0x11d0 mm/memory.c:5239 do_read_fault mm/memory.c:5396 [inline] do_fault mm/memory.c:5526 [inline] do_pte_missing mm/memory.c:4047 [inline] handle_pte_fault mm/memory.c:5889 [inline] __handle_mm_fault+0x4c6f/0x70f0 mm/memory.c:6032 handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6201 faultin_page mm/gup.c:1196 [inline] __get_user_pages+0x1a92/0x4140 mm/gup.c:1491 populate_vma_page_range+0x264/0x330 mm/gup.c:1929 __mm_populate+0x27a/0x460 mm/gup.c:2032 mm_populate include/linux/mm.h:3386 [inline] vm_mmap_pgoff+0x303/0x430 mm/util.c:580 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f613198cde9 RSP: 002b:00007f61327a8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f6131ba5fa0 RCX: 00007f613198cde9 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f6131a0e2a0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6131ba5fa0 R15: 00007ffd2904d398 rcu: rcu_preempt kthread starved for 10506 jiffies! g60673 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:25104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0x18bc/0x4c40 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6856 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 7506 Comm: kworker/u8:13 Not tainted 6.14.0-rc1-syzkaller-00081-gbb066fe812d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x1ba4/0x2d30 kernel/smp.c:885 Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b0 e8 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 60 e4 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00 RSP: 0018:ffffc9000b1cf640 EFLAGS: 00000293 RAX: ffffffff81b37985 RBX: 1ffff110170c8c75 RCX: ffff888058195a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000b1cf840 R08: ffffffff81b37950 R09: 1ffffffff2858708 R10: dffffc0000000000 R11: fffffbfff2858709 R12: ffff8880b873f9c8 R13: ffff8880b86463a8 R14: ffff8880b873f9c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c28e6a2 CR3: 000000000e738000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2118 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2328 text_poke_flush arch/x86/kernel/alternative.c:2519 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2526 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xbc/0x260 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317 worker_thread+0x870/0xd30 kernel/workqueue.c:3398 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244