rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=234997, q=45) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295112425-4295101923), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 25944 8271 9825 0x8000400c Call Trace: sched_show_task kernel/sched/core.c:5952 [inline] sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5927 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline] check_cpu_stall kernel/rcu/tree_stall.h:558 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq.cold+0xb23/0xc37 kernel/rcu/tree.c:2276 update_process_times+0x2d/0x70 kernel/time/timer.c:1726 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x90/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 b8 b0 b3 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d ff 6f c3 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 c1 93 60 f9 65 8b 05 b2 dd 11 78 RSP: 0018:ffffc90000da8bc8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1367617 RBX: 0000000000000286 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc90000da8bd8 R08: 1ffffffff16a3585 R09: fffffbfff16a3586 R10: fffffbfff16a3585 R11: ffffffff8b51ac2f R12: ffff8880ae927400 R13: ffff8880ae927400 R14: ffff8880ae927400 R15: ffff8880ae927400 __mod_timer kernel/time/timer.c:1057 [inline] mod_timer+0x507/0xc10 kernel/time/timer.c:1100 mrp_join_timer_arm+0x5e/0x80 net/802/mrp.c:583 mrp_join_timer+0x79/0x80 net/802/mrp.c:596 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:kmem_cache_free+0xab/0x320 mm/slab.c:3695 Code: e8 4a 29 00 00 84 c0 74 77 41 f7 c6 00 02 00 00 74 4f e8 08 40 c7 ff 48 83 3d e8 ce ff 07 00 0f 84 fa 01 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 70 d1 4d 7e 83 RSP: 0018:ffffc9000c3e7a90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff88809647d2c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000286 RBP: ffffc9000c3e7ab0 R08: ffff8880326be080 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a94758c0 R13: ffffffff81b8eb3b R14: 0000000000000286 R15: ffff88809647d2d8 free_mm_slot mm/khugepaged.c:381 [inline] __khugepaged_exit+0x2eb/0x410 mm/khugepaged.c:500 khugepaged_exit include/linux/khugepaged.h:51 [inline] __mmput kernel/fork.c:1081 [inline] mmput+0x402/0x4d0 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0xac2/0x2f50 kernel/exit.c:788 do_group_exit+0x135/0x360 kernel/exit.c:899 get_signal+0x47c/0x24f0 kernel/signal.c:2734 do_signal+0x87/0x1700 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x286/0x380 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c429 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbb60eb4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: 000000000000fe7a RBX: 00007fbb60eb56d4 RCX: 000000000045c429 RDX: 000000000000fe7a RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 00000000200001c0 R09: 0000000000000010 R10: 6800000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a03 R14: 00000000004cc764 R15: 000000000076bf2c