INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 1, t=120002 jiffies, g=62376, c=62375, q=124) All QSes seen, last rcu_sched kthread activity 120002 (4295144828-4295024826), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor7 R running task 60240 19155 4529 0x0000000a Call Trace: sched_show_task+0x610/0x740 kernel/sched/core.c:5346 print_other_cpu_stall kernel/rcu/tree.c:1481 [inline] check_cpu_stall kernel/rcu/tree.c:1599 [inline] __rcu_pending kernel/rcu/tree.c:3356 [inline] rcu_pending kernel/rcu/tree.c:3401 [inline] rcu_check_callbacks+0x277a/0x2ae0 kernel/rcu/tree.c:2763 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3ba/0x520 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xc54/0x1630 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x451/0x13c0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1025 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1053 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:866 RIP: 0010:rep_nop arch/x86/include/asm/processor.h:667 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/processor.h:672 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x357/0x4e0 kernel/smp.c:302 RSP: 0000:ffff88010b05f680 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81539215 RBX: 0000000000000001 RCX: ffff88011d75d7c0 RDX: 0000000000000000 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 RBP: ffff88010b05f748 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174e40 R12: ffff88010b05f6f8 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88011d75e098 smp_call_function_many+0x662/0xdf0 kernel/smp.c:434 native_flush_tlb_others+0x4e8/0x500 arch/x86/mm/tlb.c:595 flush_tlb_mm_range+0x32f/0x450 arch/x86/mm/tlb.c:644 flush_tlb_page arch/x86/include/asm/tlbflush.h:526 [inline] ptep_clear_flush+0x11c/0x1f0 mm/pgtable-generic.c:87 wp_page_copy+0x1608/0x2470 mm/memory.c:2529 do_wp_page+0xe83/0x2fa0 include/linux/spinlock_api_smp.h:152 handle_pte_fault mm/memory.c:3981 [inline] __handle_mm_fault mm/memory.c:4089 [inline] handle_mm_fault+0x33a9/0x7ed0 mm/memory.c:4126 __do_page_fault+0xec6/0x1a10 arch/x86/mm/fault.c:1400 do_page_fault+0xb7/0x250 arch/x86/mm/fault.c:1477 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1163 RIP: 0033:0x4074ea RSP: 002b:0000000000a3e8f0 EFLAGS: 00010246 RAX: 0000000000000002 RBX: 000000000072bff0 RCX: ffffffffffffffff RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000072bff0 RBP: 000000000000055a R08: 0000000000000005 R09: 0000000000a3ea30 R10: 0000000000a3e940 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000a3ea30 R14: 000000000072c014 R15: 0000000000000002 rcu_sched kthread starved for 120002 jiffies! g62376 c62375 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 61960 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2880 [inline] __schedule+0x651/0x770 kernel/sched/core.c:3524 schedule+0x1cc/0x2f0 kernel/sched/core.c:3568 schedule_timeout+0x3ef/0x580 kernel/time/timer.c:1801 rcu_gp_kthread+0x21e1/0x38d0 kernel/rcu/tree.c:2231 kthread+0x4db/0x6c0 kernel/kthread.c:241 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:413