rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (0 ticks this GP) idle=8f2/1/0x4000000000000000 softirq=8267/8268 fqs=5250 (detected by 1, t=10502 jiffies, g=8905, q=3585) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6861 Comm: syz-executor955 Not tainted 5.8.0-next-20200812-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:div64_u64 include/linux/math64.h:68 [inline] RIP: 0010:taprio_set_budget net/sched/sch_taprio.c:518 [inline] RIP: 0010:advance_sched+0x402/0x990 net/sched/sch_taprio.c:744 Code: 38 d0 7c 08 84 d2 0f 85 2b 05 00 00 41 8b 44 24 2c 4d 8d 74 24 20 31 d2 be 04 00 00 00 4c 89 f7 48 69 c0 e8 03 00 00 48 f7 f5 <48> 89 c5 e8 a6 8e 47 fb 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 RSP: 0018:ffffc90000007d78 EFLAGS: 00000006 RAX: 0000000140000002 RBX: ffff8880a8ed6340 RCX: ffff8880a65c282c RDX: 00000000000000c8 RSI: 0000000000000004 RDI: ffff8880a65c2820 RBP: 0000000000000190 R08: 0000000000000000 R09: ffff8880a8ed62e7 R10: ffffed10151dac5c R11: 0000000000000000 R12: ffff8880a65c2800 R13: 17755e622eeabcc4 R14: ffff8880a65c2820 R15: 17755e622eeabcc4 FS: 0000000000b01880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006d50a0 CR3: 00000000a801e000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:on_each_cpu+0x149/0x240 kernel/smp.c:701 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d ef b7 4c 08 00 0f 84 af 00 00 00 e8 9c f3 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 8d f3 0a 00 bf 01 00 00 00 e8 f3 35 e6 ff 31 ff RSP: 0018:ffffc900015b7b70 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000293 RCX: 1ffffffff1575fd9 RDX: ffff8880a1078100 RSI: ffffffff81697d24 RDI: 0000000000000293 RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0009dadc546d6acc R14: 003b9aca00000000 R15: 0000000000000000 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:876 timekeeping_inject_offset+0x436/0x570 kernel/time/timekeeping.c:1308 do_adjtimex+0x28f/0xa30 kernel/time/timekeeping.c:2335 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline] __do_sys_clock_adjtime+0x155/0x250 kernel/time/posix-timers.c:1121 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443709 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe40169038 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443709 RDX: 0000000000443709 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 00007ffe40169050 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 00007ffe40169060 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs