INFO: rcu_preempt self-detected stall on CPU 1-...: (10499 ticks this GP) idle=87a/140000000000001/0 softirq=46889/46889 fqs=5135 (t=10500 jiffies g=13557 c=13556 q=4219) NMI backtrace for cpu 1 CPU: 1 PID: 20636 Comm: syz-executor4 Not tainted 4.14.78+ #26 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline] rcu_dump_cpu_stacks+0x171/0x1bf kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3373 [inline] rcu_pending kernel/rcu/tree.c:3435 [inline] rcu_check_callbacks.cold.56+0x478/0xd99 kernel/rcu/tree.c:2775 update_process_times+0x24/0x60 kernel/time/timer.c:1588 tick_sched_handle.isra.8+0x73/0x150 kernel/time/tick-sched.c:161 tick_sched_timer+0x7e/0x160 kernel/time/tick-sched.c:1321 __run_hrtimer kernel/time/hrtimer.c:1259 [inline] __hrtimer_run_queues+0x2d0/0xc10 kernel/time/hrtimer.c:1323 hrtimer_interrupt+0x19a/0x440 kernel/time/hrtimer.c:1357 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] smp_apic_timer_interrupt+0x13a/0x5f0 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787 RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:91 [inline] RIP: 0010:kvm_clock_read+0x26/0x30 arch/x86/kernel/kvmclock.c:95 RSP: 0018:ffff8801d2fdf280 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000006ddac7d931 RBX: ffff8801c471b300 RCX: 0000000000000001 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff8801c471b300 R08: 0000000000000006 R09: 000000000f131159 R10: ffffed0043fffe09 R11: 0000006ddac7d931 R12: ffffffffa511cc80 R13: 0000000000000008 R14: ffff8801d2fdf3c8 R15: dffffc0000000000 kvm_sched_clock_read+0x5/0x10 arch/x86/kernel/kvmclock.c:106 paravirt_sched_clock arch/x86/include/asm/paravirt.h:175 [inline] sched_clock+0x5/0x10 arch/x86/kernel/tsc.c:228 sched_clock_cpu+0x143/0x1c0 kernel/sched/clock.c:363 local_clock include/linux/sched/clock.h:84 [inline] cpu_clock_event_update kernel/events/core.c:8795 [inline] cpu_clock_event_read+0x15/0x30 kernel/events/core.c:8828 perf_output_read_group kernel/events/core.c:5870 [inline] perf_output_read+0x811/0xfb0 kernel/events/core.c:5909 perf_output_sample+0x10dd/0x1780 kernel/events/core.c:5951 __perf_event_output kernel/events/core.c:6261 [inline] perf_event_output_forward+0x121/0x230 kernel/events/core.c:6274 __perf_event_overflow+0x116/0x320 kernel/events/core.c:7510 perf_swevent_overflow+0x166/0x1f0 kernel/events/core.c:7586 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7619 do_perf_sw_event kernel/events/core.c:7727 [inline] ___perf_sw_event+0x296/0x480 kernel/events/core.c:7758 __perf_sw_event+0x3f/0x70 kernel/events/core.c:7770 perf_sw_event include/linux/perf_event.h:1041 [inline] __do_page_fault+0x77f/0xb60 arch/x86/mm/fault.c:1466 page_fault+0x22/0x50 arch/x86/entry/entry_64.S:1104 RIP: 0010:copy_user_enhanced_fast_string+0x7/0x10 arch/x86/lib/copy_user_64.S:180 RSP: 0018:ffff8801d2fdfb98 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000001000 RCX: 00000000000001c0 RDX: 0000000000001000 RSI: 00000000205fd000 RDI: ffff8801c17bde40 RBP: 00000000205fc1c0 R08: 0000000000000000 R09: 0000000000000040 R10: ffffed00382f7bff R11: ffff8801c17bdfff R12: ffff8801c17bd000 R13: 00007ffffffff000 R14: 00000000205fd1c0 R15: ffff8801c17bd000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 copy_page_from_iter_iovec lib/iov_iter.c:290 [inline] copy_page_from_iter+0x320/0x7a0 lib/iov_iter.c:731 pipe_write+0x21a/0xd30 fs/pipe.c:434 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x417/0x5c0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_write fs/read_write.c:593 [inline] SyS_write+0xc2/0x1a0 fs/read_write.c:585 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007f8fc077dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 00000000fffffef3 RSI: 00000000200001c0 RDI: 0000000000000008 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8fc077e6d4 R13: 00000000004c2883 R14: 00000000004d8568 R15: 00000000ffffffff INFO: rcu_sched detected stalls on CPUs/tasks: 1-...: (1 GPs behind) idle=87a/140000000000000/0 softirq=46887/46889 fqs=5132 (detected by 0, t=10545 jiffies, g=10948, c=10947, q=205) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 20636 Comm: syz-executor4 Not tainted 4.14.78+ #26 task: ffff8801c3eac680 task.stack: ffff8801d2fd8000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] RIP: 0010:atomic_long_read include/asm-generic/atomic-long.h:45 [inline] RIP: 0010:perf_event_count kernel/events/core.c:3720 [inline] RIP: 0010:perf_output_read_group kernel/events/core.c:5872 [inline] RIP: 0010:perf_output_read+0x55a/0xfb0 kernel/events/core.c:5909 RSP: 0018:ffff8801d2fdf2f0 EFLAGS: 00000246 RAX: 1ffff100382a8efc RBX: ffff8801d2fdf5f8 RCX: 0000000000040000 RDX: ffffffff813e60a7 RSI: ffffc90005b9c000 RDI: ffff8801c15477e0 RBP: ffff8801c1547750 R08: ffffed003a3b8658 R09: ffffed003a3b8657 R10: ffffed003a3b8657 R11: ffff8801d1dc32bf R12: 0000000000000000 R13: 0000000000000008 R14: ffff8801d2fdf3c8 R15: dffffc0000000000 FS: 00007f8fc077e700(0000) GS:ffff8801d7700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000205fd000 CR3: 00000001c2f98001 CR4: 00000000001606a0 Call Trace: perf_output_sample+0x10dd/0x1780 kernel/events/core.c:5951 __perf_event_output kernel/events/core.c:6261 [inline] perf_event_output_forward+0x121/0x230 kernel/events/core.c:6274 __perf_event_overflow+0x116/0x320 kernel/events/core.c:7510 perf_swevent_overflow+0x166/0x1f0 kernel/events/core.c:7586 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7619 do_perf_sw_event kernel/events/core.c:7727 [inline] ___perf_sw_event+0x296/0x480 kernel/events/core.c:7758 __perf_sw_event+0x3f/0x70 kernel/events/core.c:7770 perf_sw_event include/linux/perf_event.h:1041 [inline] __do_page_fault+0x77f/0xb60 arch/x86/mm/fault.c:1466 page_fault+0x22/0x50 arch/x86/entry/entry_64.S:1104 RIP: 0010:copy_user_enhanced_fast_string+0x7/0x10 arch/x86/lib/copy_user_64.S:180 RSP: 0018:ffff8801d2fdfb98 EFLAGS: 00010206 RAX: 0000000000000000 RBX: 0000000000001000 RCX: 00000000000001c0 RDX: 0000000000001000 RSI: 00000000205fd000 RDI: ffff8801c17bde40 RBP: 00000000205fc1c0 R08: 0000000000000000 R09: 0000000000000040 R10: ffffed00382f7bff R11: ffff8801c17bdfff R12: ffff8801c17bd000 R13: 00007ffffffff000 R14: 00000000205fd1c0 R15: ffff8801c17bd000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 copy_page_from_iter_iovec lib/iov_iter.c:290 [inline] copy_page_from_iter+0x320/0x7a0 lib/iov_iter.c:731 pipe_write+0x21a/0xd30 fs/pipe.c:434 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x417/0x5c0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_write fs/read_write.c:593 [inline] SyS_write+0xc2/0x1a0 fs/read_write.c:585 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457569 RSP: 002b:00007f8fc077dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 00000000fffffef3 RSI: 00000000200001c0 RDI: 0000000000000008 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8fc077e6d4 R13: 00000000004c2883 R14: 00000000004d8568 R15: 00000000ffffffff Code: 0f 8e 4f 08 00 00 83 bd 88 00 00 00 01 0f 84 86 02 00 00 e8 b9 5c f2 ff 48 8d bd 90 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 38 00 <0f> 85 10 08 00 00 48 8d bd 98 00 00 00 4c 8b a5 90 00 00 00 48