rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=49e/1/0x4000000000000000 softirq=91747/91747 fqs=416 (detected by 1, t=10502 jiffies, g=130813, q=6699) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 30981 Comm: syz-executor.2 Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:enqueue_hrtimer kernel/time/hrtimer.c:967 [inline] RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1537 [inline] RIP: 0010:__hrtimer_run_queues+0x51f/0x930 kernel/time/hrtimer.c:1584 Code: db 0f 85 d4 00 00 00 e8 ff 92 0f 00 4c 89 e7 48 c7 c6 00 ed 4e 89 e8 e0 c9 3b 02 4c 89 e7 31 f6 e8 36 3c 00 00 48 8b 54 24 10 <48> 89 d0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 ae 02 00 00 0f b6 RSP: 0018:ffffc90000007dc0 EFLAGS: 00000046 RAX: ffffffff816573ea RBX: 0000000000000000 RCX: ffff88809e8a6380 RDX: ffff8880ae827688 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 1ffff11015d04ed8 R08: ffffffff816573e1 R09: fffffbfff131af3e R10: fffffbfff131af3e R11: 0000000000000000 R12: ffff888091adfb40 R13: 1ffff11015d04ed2 R14: dffffc0000000000 R15: 1ffff1101235bf6f FS: 00007fd3ee50d700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30723000 CR3: 0000000065875000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __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+0x94/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:592 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0xd0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 b8 d8 4b 89 e8 2a 16 92 f9 48 83 3d 2a 04 2a 01 00 74 2c 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 5c ec 2e f9 65 8b 05 61 29 e0 77 RSP: 0018:ffffc900017a7ca8 EFLAGS: 00000286 RAX: 1ffffffff1297b17 RBX: ffffffff894ef548 RCX: dffffc0000000000 RDX: ffffc9000dda7000 RSI: 0000000000000088 RDI: 0000000000000286 RBP: ffffffff8165dcc3 R08: ffffffff817a69e0 R09: fffffbfff129deaa R10: fffffbfff129deaa R11: 0000000000000000 R12: 0000000080000000 R13: 0000000000000286 R14: 0000000000000286 R15: ffffc900017a7d98 timekeeping_inject_offset+0x69d/0x700 kernel/time/timekeeping.c:1302 do_adjtimex+0x3b3/0x9a0 kernel/time/timekeeping.c:2332 do_clock_adjtime kernel/time/posix-timers.c:1109 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1121 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1112 [inline] __x64_sys_clock_adjtime+0x17e/0x210 kernel/time/posix-timers.c:1112 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cce9 Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd3ee50cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 0000000000001dc0 RCX: 000000000045cce9 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000000 RBP: 000000000078bfd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffe682c0f2f R14: 00007fd3ee50d9c0 R15: 000000000078bfac rcu: rcu_preempt kthread starved for 9669 jiffies! g130813 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28896 10 2 0x00004000 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x979/0xce0 kernel/sched/core.c:4527