INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=100002 jiffies, g=24055, c=24054, q=289) All QSes seen, last rcu_sched kthread activity 100002 (4294989982-4294889980), jiffies_till_next_fqs=3, root ->qsmask 0x0 syz-executor1 R running task 58592 8175 4507 0x00000008 Call Trace: sched_show_task+0x600/0x730 kernel/sched/core.c:5332 print_other_cpu_stall kernel/rcu/tree.c:1441 [inline] check_cpu_stall kernel/rcu/tree.c:1559 [inline] __rcu_pending kernel/rcu/tree.c:3244 [inline] rcu_pending kernel/rcu/tree.c:3291 [inline] rcu_check_callbacks+0x2627/0x2990 kernel/rcu/tree.c:2646 update_process_times+0x132/0x1a0 kernel/time/timer.c:1636 tick_sched_handle kernel/time/tick-sched.c:164 [inline] tick_sched_timer+0x3a6/0x500 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0xbfc/0x15b0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x458/0x13d0 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt+0x6b/0x250 arch/x86/kernel/apic/apic.c:1028 smp_apic_timer_interrupt+0x5a/0x90 arch/x86/kernel/apic/apic.c:1056 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:868 RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x36b/0x4e0 kernel/smp.c:302 Code: 3a e8 59 8e 6b 00 45 85 f6 0f 84 6d ff ff ff 41 89 de eb 10 90 66 2e 0f 1f 84 00 00 00 00 00 e8 3b 32 12 00 f3 90 8b 5c 24 78 <4c> 89 e7 e8 bd 84 6b 00 8b 00 83 e0 01 83 e3 01 85 c0 74 06 f7 d0 RSP: 0018:ffff8801a8d8f300 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81535185 RBX: 0000000000000003 RCX: 0000000000040000 RDX: ffffc90005129000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffff8801a8d8f3d8 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffffffff81174df0 R12: ffff8801a8d8f378 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801322488f8 smp_call_function_many+0x658/0xdb0 kernel/smp.c:434 native_flush_tlb_others+0x4e8/0x500 arch/x86/mm/tlb.c:595 flush_tlb_mm_range+0x32b/0x450 arch/x86/mm/tlb.c:644 tlb_flush_mmu_tlbonly+0x1c1/0x5f0 mm/memory.c:247 tlb_flush_mmu mm/memory.c:268 [inline] arch_tlb_finish_mmu mm/memory.c:284 [inline] tlb_finish_mmu+0x1fd/0x590 mm/memory.c:434 unmap_region+0x544/0x5a0 mm/mmap.c:2573 do_munmap+0x1b56/0x2650 mm/mmap.c:2780 mmap_region+0x1540/0x3630 mm/mmap.c:1705 do_mmap+0x17cd/0x1e70 mm/mmap.c:1535 do_mmap_pgoff include/linux/mm.h:2306 [inline] vm_mmap_pgoff+0x30a/0x410 mm/util.c:357 ksys_mmap_pgoff+0xa56/0xaf0 mm/mmap.c:1585 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0x1f1/0x260 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x15b/0x220 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457089 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9305aa5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f9305aa66d4 RCX: 0000000000457089 RDX: 000000000200000d RSI: 0000000000e7e000 RDI: 0000000020000000 RBP: 0000000000930320 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000012 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d2250 R14: 00000000004c79cb R15: 0000000000000004 rcu_sched kthread starved for 100002 jiffies! g24055 c24054 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 RCU grace-period kthread stack dump: rcu_sched R running task 61848 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2857 [inline] __schedule+0x667/0x770 kernel/sched/core.c:3507 schedule+0x1bc/0x2d0 kernel/sched/core.c:3551 schedule_timeout+0x3f0/0x580 kernel/time/timer.c:1801 rcu_gp_kthread+0x1da1/0x3850 kernel/rcu/tree.c:2179 kthread+0x44d/0x480 kernel/kthread.c:247 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415