rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...0: (1 GPs behind) idle=a6e/1/0x4000000000000000 softirq=8506/8507 fqs=5249 (detected by 1, t=10502 jiffies, g=9261, q=3451) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6842 Comm: syz-executor787 Not tainted 5.8.0-rc7-next-20200731-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_off+0x27/0x210 kernel/trace/trace_preemptirq.c:78 Code: 00 00 00 41 56 41 55 41 54 55 53 e8 63 3c fa ff 48 8b 7c 24 28 e8 d9 58 77 06 65 8b 1d 02 04 89 7e 31 ff 89 de e8 c9 38 fa ff <85> db 75 2a e8 40 3c fa ff 65 c7 05 e5 03 89 7e 01 00 00 00 65 8b RSP: 0018:ffffc90000007da0 EFLAGS: 00000046 RAX: 0000000080010002 RBX: 0000000000000001 RCX: ffffffff817a03c7 RDX: 0000000000000001 RSI: ffff88809478a440 RDI: 0000000000000005 RBP: ffff8880ae627700 R08: 0000000000000000 R09: ffff8880ae627703 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae627700 R13: ffff8880ae627800 R14: ffff8880a85d9b40 R15: dffffc0000000000 FS: 0000000001012880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000610 CR3: 000000009e5c5000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x5b/0xe0 kernel/locking/spinlock.c:191 __run_hrtimer kernel/time/hrtimer.c:1516 [inline] __hrtimer_run_queues+0x5d1/0xfc0 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+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1090 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:835 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d ef a1 4b 08 00 0f 84 af 00 00 00 e8 2c ee 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 1d ee 0a 00 bf 01 00 00 00 e8 53 40 e6 ff 31 ff RSP: 0018:ffffc900057a7d78 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000293 RCX: 1ffffffff1572ba1 RDX: ffff88809478a440 RSI: ffffffff816951e4 RDI: 0000000000000293 RBP: 0000000000000200 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc900057a7ed8 R15: ffffffffa0d7d240 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+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x443849 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:00007ffce6321fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443849 RDX: 0000000000443849 RSI: 0000000020000380 RDI: 0000000000000000 RBP: 00007ffce6321ff0 R08: 0000000001bbbbbb R09: 0000000001bbbbbb R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007ffce6322000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000