rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=96421, q=1267) rcu: All QSes seen, last rcu_preempt kthread activity 10489 (4295004739-4294994250), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 27008 19562 8821 0x80004008 Call Trace: sched_show_task+0x408/0x560 kernel/sched/core.c:5952 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+0x147c/0x1970 kernel/rcu/tree.c:2276 update_process_times+0x12c/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3cf/0x7d0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x109/0x280 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:759 [inline] RIP: 0010:lock_acquire+0x1b0/0x250 kernel/locking/lockdep.c:4487 Code: e8 03 42 80 3c 28 00 74 0c 48 c7 c7 18 d4 0a 89 e8 85 f5 56 00 48 83 3d b5 e4 b0 07 00 0f 84 9d 00 00 00 48 8b 7c 24 10 57 9d <0f> 1f 44 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 44 89 RSP: 0018:ffffc90000da8ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215a83 RBX: ffffc90000da8d58 RCX: ffffffff815ac4d5 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff15db93d R10: fffffbfff15db93d R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000 call_timer_fn+0x7c/0x160 kernel/time/timer.c:1401 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786 __do_softirq+0x268/0x7c5 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:balance_callback kernel/sched/core.c:3285 [inline] RIP: 0010:__schedule+0x7db/0xc50 kernel/sched/core.c:4086 Code: 20 84 c0 0f 85 58 03 00 00 8a 03 48 8b 7c 24 10 4c 89 fe e8 87 24 06 00 48 89 c7 e8 5f f3 57 f9 49 89 c6 49 8d ae 80 0a 00 00 <48> 89 eb 48 c1 eb 03 42 80 3c 23 00 74 08 48 89 ef e8 1f 08 b7 f9 RSP: 0018:ffffc900018875c8 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 RAX: ffff8880ae937180 RBX: ffffc90000d7fd60 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8880ae937c00 R08: ffffffff817a3210 R09: ffffed1015d26e31 R10: ffffed1015d26e31 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880a33c04b0 R14: ffff8880ae937180 R15: ffff8880a9a3a440 preempt_schedule_irq+0xca/0x150 kernel/sched/core.c:4337 retint_kernel+0x1b/0x2b RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:need_resched include/linux/sched.h:1820 [inline] RIP: 0010:preempt_schedule_common kernel/sched/core.c:4243 [inline] RIP: 0010:preempt_schedule+0xd0/0x110 kernel/sched/core.c:4260 Code: 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 b5 00 b7 f9 4d 89 37 bf 01 00 00 00 e8 18 f0 ff ff 65 83 05 0c 39 08 78 ff <65> 4c 8b 34 25 c0 1d 02 00 4c 89 f7 be 08 00 00 00 e8 ca ce b6 f9 RSP: 0018:ffffc90001887738 EFLAGS: 00000257 ORIG_RAX: ffffffffffffff13 RAX: 7d29ada07e56e400 RBX: dffffc0000000000 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc900018877a0 R08: ffffffff817a3210 R09: ffffed1015d26e31 R10: ffffed1015d26e31 R11: 0000000000000000 R12: 1ffff110109b5ac1 R13: dffffc0000000000 R14: ffffffff81005f40 R15: ffff8880a33c12d8 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50 __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183 spin_unlock include/linux/spinlock.h:378 [inline] zap_pte_range+0x1742/0x1c00 mm/memory.c:1136 zap_pmd_range mm/memory.c:1184 [inline] zap_pud_range mm/memory.c:1213 [inline] zap_p4d_range mm/memory.c:1234 [inline] unmap_page_range+0x9a0/0xb00 mm/memory.c:1255 unmap_vmas+0x15d/0x2c0 mm/memory.c:1332 exit_mmap+0x276/0x530 mm/mmap.c:3126 __mmput+0x113/0x350 kernel/fork.c:1082 exit_mm+0x4cd/0x550 kernel/exit.c:485 do_exit+0x56e/0x1f80 kernel/exit.c:788 do_group_exit+0x15e/0x2c0 kernel/exit.c:899 get_signal+0x13cf/0x1d60 kernel/signal.c:2739 do_signal+0x33/0x610 arch/x86/kernel/signal.c:813 exit_to_usermode_loop arch/x86/entry/common.c:160 [inline] prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:195 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45f68a Code: Bad RIP value. RSP: 002b:00007f422c7d2c58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045f68a RDX: 0000000000005207 RSI: 00007f422c7d2c60 RDI: 0000000000000001 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000000c5 R14: 00000000004c351f R15: 000000000076bf0c rcu: rcu_preempt kthread starved for 10489 jiffies! g96421 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29072 10 2 0x80004000 Call Trace: