rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (0 ticks this GP) idle=b3e/1/0x4000000000000000 softirq=8208/8208 fqs=5249 (detected by 1, t=10502 jiffies, g=7773, q=3572) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7020 Comm: syz-executor052 Not tainted 5.8.0-rc5-next-20200716-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xe3d/0x56e0 kernel/locking/lockdep.c:4238 Code: ff e9 d3 f2 ff ff 48 8b 6c 24 70 e8 6d fe 92 06 85 c0 0f 85 10 05 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df 48 8b 5c 24 20 <48> c7 04 03 00 00 00 00 48 8b 84 24 e8 00 00 00 65 48 2b 04 25 28 RSP: 0018:ffffc90000007b20 EFLAGS: 00000083 RAX: dffffc0000000000 RBX: 1ffff92000000f76 RCX: 0000000000000001 RDX: 1ffff110113dc152 RSI: 0000000000000008 RDI: ffffffff8c061398 RBP: ffff888089ee0a98 R08: 0000000000000000 R09: ffffffff8c654abf R10: fffffbfff18ca957 R11: 0000000000000000 R12: ffff888089ee01c0 R13: dffffc0000000000 R14: a518158209ab17b1 R15: 0000000000000001 FS: 00007f43ad2fc700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 00000000a35e6000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] advance_sched+0x4f/0x990 net/sched/sch_taprio.c:699 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1096 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+0xe0/0x120 arch/x86/kernel/apic/apic.c:1090 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline] RIP: 0010:on_each_cpu+0x149/0x240 kernel/smp.c:840 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d 87 c1 4b 08 00 0f 84 af 00 00 00 e8 5c ef 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 4d ef 0a 00 bf 01 00 00 00 e8 f3 57 e6 ff 31 ff RSP: 0018:ffffc90001d57d70 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000293 RCX: 0000000000000000 RDX: ffff888089ee01c0 RSI: ffffffff81694084 RDI: 0000000000000293 RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc90001d57ed0 R15: ffffffffa0eac704 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:872 do_settimeofday64 kernel/time/timekeeping.c:1257 [inline] do_settimeofday64+0x350/0x4e0 kernel/time/timekeeping.c:1223 do_sys_settimeofday64 kernel/time/time.c:195 [inline] do_sys_settimeofday64+0x1de/0x260 kernel/time/time.c:169 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline] __x64_sys_clock_settime+0x197/0x260 kernel/time/posix-timers.c:1067 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x448e99 Code: Bad RIP value. RSP: 002b:00007f43ad2fbda8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00000000006dec48 RCX: 0000000000448e99 RDX: 0000000000448e99 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 00000000006dec40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dec4c R13: 0000000000000000 R14: 000000306d616574 R15: 00000000006dec4c