rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=167809, q=31) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295052784-4295042281), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 24408 29086 5406 0x00004008 Call Trace: sched_show_task kernel/sched/core.c:5961 [inline] sched_show_task.cold+0x2ed/0x34e kernel/sched/core.c:5936 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2795 [inline] rcu_sched_clock_irq.cold+0xafc/0xc12 kernel/rcu/tree.c:2244 update_process_times+0x2d/0x70 kernel/time/timer.c:1726 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1299 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:div_u64_rem include/linux/math64.h:27 [inline] RIP: 0010:div_u64 include/linux/math64.h:126 [inline] RIP: 0010:calculate_probability net/sched/sch_pie.c:373 [inline] RIP: 0010:pie_timer+0x338/0x830 net/sched/sch_pie.c:450 Code: 00 4c 89 bd 78 ff ff ff 89 c3 e8 23 58 a5 fb 47 8d 24 a4 31 d2 4c 89 f7 43 8d 0c 24 48 c7 c0 ff ff ff ff 49 c1 ed 02 48 f7 f1 <49> 89 c7 48 89 c6 49 89 cc 48 c1 6d b0 02 e8 15 59 a5 fb 4d 39 fe RSP: 0018:ffff8880ae809c78 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 000010c6f7a0b5ed RBX: 0000000000000002 RCX: 00000000000f4240 RDX: 0000000000086abf RSI: ffffffff85cd79bd RDI: 0000000000000000 RBP: ffff8880ae809d00 R08: ffff88806232e040 R09: ffffed1015d0137d R10: ffffed1015d0137c R11: 0000000000000003 R12: 000000000007a120 R13: 00000000112e0be8 R14: 0000000000000000 R15: 0000a7c5ac471b47 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:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4490 Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d a1 01 9a 07 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b RSP: 0018:ffff888036ca7c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11e61a4 RBX: ffff88806232e040 RCX: ffffffff8158bee2 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffff888036ca7c80 R08: 0000000000001d16 R09: fffffbfff14ed73d R10: ffff88806232e8d8 R11: ffff88806232e040 R12: ffff88803dd47190 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 __might_fault mm/memory.c:4450 [inline] __might_fault+0x15e/0x1e0 mm/memory.c:4435 __sys_sendmmsg+0x1ee/0x4d0 net/socket.c:2418 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg net/socket.c:2439 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2439 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fbd46aadc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459a29 RDX: 04000000000000d7 RSI: 00000000200002c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd46aae6d4 R13: 00000000004c7225 R14: 00000000004dca68 R15: 00000000ffffffff