INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=37509, c=37508, q=189) All QSes seen, last rcu_preempt kthread activity 10500 (4295067409-4295056909), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 28016 20159 6375 0x8000000c Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:299 [inline] RIP: 0010:rcu_read_lock_sched_held+0x6a/0x130 kernel/rcu/update.c:109 RSP: 0018:ffff8880aea07d68 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffffffff8813cda0 RCX: 0000000000000002 RDX: 0000000000000004 RSI: ffff88809079aa08 RDI: ffff88809079aa04 RBP: 0000000000000100 R08: 0000000000001d76 R09: ffffffff8a06e3f0 R10: ffff88809079aa08 R11: ffff88809079a180 R12: ffff8880aea07db0 R13: 1ffff11015d40fb2 R14: ffff88809ecbcac0 R15: 0000000000000000 trace_timer_expire_entry include/trace/events/timer.h:90 [inline] call_timer_fn+0x550/0x650 kernel/time/timer.c:1278 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:is_swap_pmd include/linux/huge_mm.h:185 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1428 [inline] RIP: 0010:zap_pud_range mm/memory.c:1473 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1494 [inline] RIP: 0010:unmap_page_range+0x4f4/0x1930 mm/memory.c:1515 RSP: 0018:ffff8880677e7810 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: ffff8880984f2eb8 RBX: dffffc0000000000 RCX: 00007f417ae00000 RDX: 0000000000000000 RSI: 00007f417ae95000 RDI: ffff88809079a1a4 RBP: ffff8880677e7910 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88809079aa30 R11: ffff88809079a180 R12: 000000004501b067 R13: ffff8880677e7910 R14: 00007f417ae00000 R15: ffffea0001bee3c0 unmap_single_vma+0x147/0x2b0 mm/memory.c:1560 unmap_vmas+0x9d/0x160 mm/memory.c:1590 exit_mmap+0x26d/0x4b0 mm/mmap.c:3056 __mmput kernel/fork.c:930 [inline] mmput+0x103/0x420 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x933/0x2b00 kernel/exit.c:845 do_group_exit+0x100/0x310 kernel/exit.c:955 get_signal+0x385/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x159/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode+0x1af/0x210 arch/x86/entry/common.c:199 retint_user+0x8/0x18 RIP: 0033:0x4035a5 RSP: 002b:00007f4179293c60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: 000000000078bf08 RCX: 000000000045f66a RDX: 0000000000000000 RSI: 00007f4179293c60 RDI: 0000000000000001 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 00000000000003c0 R14: 00000000004c6499 R15: 000000000078bf0c rcu_preempt kthread starved for 10500 jiffies! g37509 c37508 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29296 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404