rcu: INFO: rcu_sched self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=ce2/1/0x4000000000000004 softirq=11301/11304 fqs=7 (t=10500 jiffies g=9549 q=274) rcu: rcu_sched kthread starved for 10470 jiffies! g9549 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_sched R running task 28800 10 2 0x80084000 Call Trace: schedule+0xc1/0x2b0 kernel/sched/core.c:4155 schedule_timeout+0x4a9/0xe20 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0x8de/0x12e0 kernel/rcu/tree.c:1821 kthread+0x352/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 5806 Comm: syz-executor.5 Not tainted 5.5.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xee/0x16e lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x38/0x3d lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1dd/0x209 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x201/0x24f kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq.cold.108+0x51d/0xbd8 kernel/rcu/tree.c:2271 update_process_times+0x24/0x70 kernel/time/timer.c:1726 tick_sched_handle+0x99/0x180 kernel/time/tick-sched.c:171 tick_sched_timer+0x40/0x120 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x334/0xd50 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x2e6/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x101/0x560 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:div_u64_rem include/linux/math64.h:27 [inline] RIP: 0010:div_u64 include/linux/math64.h:126 [inline] RIP: 0010:pie_calculate_probability+0x25d/0x830 net/sched/sch_pie.c:357 Code: 24 30 41 89 c6 4c 89 6c 24 38 e8 5e 9a c4 fd 8d 6c ad 00 31 d2 4c 89 ff 8d 4c 2d 00 48 c7 c0 ff ff ff ff 49 c1 ec 02 48 f7 f1 <49> 89 c5 48 89 c6 48 c1 eb 02 48 89 cd e8 41 9b c4 fd 4d 39 ef 73 RSP: 0018:ffffc90000140c68 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: 000010c6f7a0b5ed RBX: 00000002af31dc46 RCX: 00000000000f4240 RDX: 0000000000086abf RSI: ffffffff8394db42 RDI: 0000000000000000 RBP: 000000000007a120 R08: ffff8881d1290000 R09: fffff5200002818f R10: fffff5200002818f R11: 0000000000000003 R12: 00000000112e0be8 R13: 0000a7c5ac471b47 R14: 0000000000000002 R15: 0000000000000000 fq_pie_timer+0x184/0x2b0 net/sched/sch_fq_pie.c:377 call_timer_fn+0x1b9/0x7b0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] run_timer_softirq+0x7b6/0x1380 kernel/time/timer.c:1786 __do_softirq+0x22a/0xa19 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x131/0x160 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x144/0x560 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:__raw_callee_save___kvm_vcpu_is_preempted+0xf/0x20 Code: d7 58 21 01 8b 0c 24 8b 44 24 08 e9 07 fc ff ff cc cc cc cc cc cc cc cc cc cc cc 48 8b 04 fd 80 db 69 85 80 b8 d0 19 02 00 00 <0f> 95 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 c3 66 66 2e 0f RSP: 0018:ffffc900005bf538 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8881f6e00000 RBX: ffff8881d5fa3200 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 RBP: ffffc900005bf580 R08: ffffed103a252001 R09: ffffed103a252001 R10: ffffed103a252000 R11: ffff8881d1290007 R12: 0000000000000000 R13: fffffbfff0b2f32a R14: ffff8881d1290000 R15: dffffc0000000000 pv_vcpu_is_preempted arch/x86/include/asm/paravirt.h:658 [inline] vcpu_is_preempted arch/x86/include/asm/qspinlock.h:61 [inline] mutex_spin_on_owner+0x15d/0x370 kernel/locking/mutex.c:569 mutex_optimistic_spin kernel/locking/mutex.c:673 [inline] __mutex_lock_common kernel/locking/mutex.c:959 [inline] __mutex_lock+0x33c/0x13c0 kernel/locking/mutex.c:1103 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x442/0xb90 net/core/rtnetlink.c:5426 netlink_rcv_skb+0x14c/0x400 net/netlink/af_netlink.c:2477 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x550/0x750 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x900/0xe00 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcd/0x130 net/socket.c:672 ____sys_sendmsg+0x6bb/0x7f0 net/socket.c:2343 ___sys_sendmsg+0x10a/0x180 net/socket.c:2397 __sys_sendmsg+0xfe/0x1d0 net/socket.c:2430 do_syscall_64+0xd4/0x660 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7618badb29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f76187300c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7618cccf80 RCX: 00007f7618badb29 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 RBP: 00007f7618bf947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f7618cccf80 R15: 00007ffed6dc1ad8