rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=c2fc/1/0x4000000000000000 softirq=93852/93853 fqs=0 (detected by 1, t=10504 jiffies, g=129469, q=26 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 32751 Comm: syz-executor.4 Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:kasan_check_range+0x134/0x180 mm/kasan/generic.c:190 Code: 85 d2 75 0b 48 89 da 48 29 c2 e9 55 ff ff ff 49 39 d2 75 17 49 0f be 02 41 83 e1 07 49 39 c1 7d 0a 5b b8 01 00 00 00 5d 41 5c 44 89 c2 e8 c3 ee ff ff 5b 83 f0 01 5d 41 5c c3 b8 01 00 00 00 RSP: 0018:ffffc90000007cd8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffff92000000f9e RCX: ffffffff815f9058 RDX: fffffbfff1bbf743 RSI: 0000000000000008 RDI: ffffffff8ddfba10 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8ddfba17 R10: fffffbfff1bbf742 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8bf89d00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ee22000 CR3: 000000000bc8e000 CR4: 00000000003526f0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] cpumask_test_cpu include/linux/cpumask.h:390 [inline] cpu_online include/linux/cpumask.h:965 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0xb8/0x570 kernel/locking/lockdep.c:5637 rcu_lock_acquire include/linux/rcupdate.h:280 [inline] rcu_read_lock include/linux/rcupdate.h:706 [inline] advance_sched+0x4a5/0x9a0 net/sched/sch_taprio.c:769 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x5fa/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:360 [inline] RIP: 0010:unwind_next_frame+0x12e4/0x1cc0 arch/x86/kernel/unwind_orc.c:605 Code: 0f 84 d7 f0 ff ff 4c 89 f7 e8 88 e6 ff ff 49 8d 7d 40 48 89 fa 48 89 c5 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 84 86 fc ff ff e8 c1 91 92 00 e9 7c fc ff ff 49 8d 6d 40 48 b8 RSP: 0018:ffffc90005a9f568 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 1ffff92000b53ecd RSI: ffffc90005a9f5f8 RDI: ffffc90005a9f668 RBP: ffffc90005a9f6b0 R08: ffffffff8e5e2992 R09: ffffc90005a9f65c R10: fffff52000b53ed0 R11: ffffc90005a9f620 R12: ffffc90005a9f65d R13: ffffc90005a9f628 R14: ffffc90005a9f5f8 R15: ffffffff8e5e2996 __unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:717 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 save_stack+0x151/0x1e0 mm/page_owner.c:127 __reset_page_owner+0x59/0x180 mm/page_owner.c:148 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 tlb_batch_list_free mm/mmu_gather.c:74 [inline] tlb_finish_mmu+0x1a3/0x7e0 mm/mmu_gather.c:356 exit_mmap+0x1fe/0x720 mm/mmap.c:3102 __mmput+0x128/0x4c0 kernel/fork.c:1186 mmput+0x5c/0x70 kernel/fork.c:1208 exit_mm kernel/exit.c:515 [inline] do_exit+0xb4c/0x2b60 kernel/exit.c:805 do_group_exit+0xd0/0x2a0 kernel/exit.c:948 get_signal+0x238c/0x2610 kernel/signal.c:2858 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe230e89279 Code: Unable to access opcode bytes at RIP 0x7fe230e8924f. RSP: 002b:00007fe2320b6218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fe230f9bf88 RCX: 00007fe230e89279 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe230f9bf88 RBP: 00007fe230f9bf80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe230f9bf8c R13: 00007ffcfd99567f R14: 00007fe2320b6300 R15: 0000000000022000 rcu: rcu_preempt kthread starved for 10504 jiffies! g129469 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:29088 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5197 [inline] __schedule+0xae5/0x52c0 kernel/sched/core.c:6509 schedule+0xda/0x1b0 kernel/sched/core.c:6585 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 1 CPU: 1 PID: 5804 Comm: kworker/u4:23 Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: events_unbound toggle_allocation_gate Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:514 print_other_cpu_stall kernel/rcu/tree_stall.h:619 [inline] check_cpu_stall kernel/rcu/tree_stall.h:762 [inline] rcu_pending kernel/rcu/tree.c:3660 [inline] rcu_sched_clock_irq+0x2404/0x2530 kernel/rcu/tree.c:2342 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline] RIP: 0010:smp_call_function_many_cond+0x5c3/0x1430 kernel/smp.c:988 Code: 89 ee e8 e0 a8 0a 00 85 ed 74 48 48 8b 44 24 08 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 ef ab 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 b5 0b 00 00 8b 43 08 31 RSP: 0018:ffffc90005aef948 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9a42800 RCX: 0000000000000000 RDX: ffff88802566d7c0 RSI: ffffffff81714e91 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffffed1017348501 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1302 [inline] text_poke_bp_batch+0x233/0x6c0 arch/x86/kernel/alternative.c:1490 text_poke_flush arch/x86/kernel/alternative.c:1660 [inline] text_poke_flush arch/x86/kernel/alternative.c:1657 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:801 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:811 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:803 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306