INFO: rcu_preempt self-detected stall on CPU
	0-...: (10499 ticks this GP) idle=b56/140000000000001/0 softirq=200900/200901 fqs=5141 
	 (t=10500 jiffies g=62068 c=62067 q=5181)
NMI backtrace for cpu 0
CPU: 0 PID: 12715 Comm: syz-executor5 Not tainted 4.14.90+ #29
Call Trace:
 <IRQ>
 __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:158 [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:3382 [inline]
 rcu_pending kernel/rcu/tree.c:3444 [inline]
 rcu_check_callbacks.cold.56+0x478/0xd99 kernel/rcu/tree.c:2784
 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/0x600 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787
 </IRQ>
RIP: 0010:memcpy+0x3e/0x50 mm/kasan/kasan.c:306
RSP: 0018:ffff88817db1f2d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffffed1038d774d7 RBX: ffff88817db1f5f8 RCX: ffffffff981e9338
RDX: 0000000000000008 RSI: ffff88817db1f3c0 RDI: ffff8881c6bba6b0
RBP: ffff8881c6bba6b0 R08: ffffed1038d774d7 R09: ffffed1038d774d6
R10: ffffed1038d774d6 R11: ffff8881c6bba6b7 R12: ffff88817db1f3c0
R13: 0000000000000008 R14: ffff88817db1f3c8 R15: dffffc0000000000
 memcpy include/linux/string.h:344 [inline]
 memcpy_common kernel/events/internal.h:172 [inline]
 __output_copy kernel/events/internal.h:176 [inline]
 perf_output_read_group kernel/events/core.c:5876 [inline]
 perf_output_read+0x688/0xfb0 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:181
RSP: 0018:ffff88817db1fb98 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000100
RDX: 0000000000001000 RSI: 0000000020e70000 RDI: ffff888177764f00
RBP: 0000000020e6f100 R08: 0000000000000000 R09: 0000000000000040
R10: ffffed102eeec9ff R11: ffff888177764fff R12: ffff888177764000
R13: 00007ffffffff000 R14: 0000000020e70100 R15: ffff888177764000
 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:1784 [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: 0033:0x4579b9
RSP: 002b:00007f0be254bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9
RDX: 00000000fffffdbc RSI: 0000000020000100 RDI: 0000000000000007
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0be254c6d4
R13: 00000000004c367d R14: 00000000004db550 R15: 00000000ffffffff
INFO: rcu_sched self-detected stall on CPU
	0-...: (10473 ticks this GP) idle=b56/140000000000001/0 softirq=200901/200901 fqs=5128 
INFO: rcu_sched detected stalls on CPUs/tasks:
	 (t=10522 jiffies g=46873 c=46872 q=373)
	0-...: (10473 ticks this GP) idle=b56/140000000000001/0 softirq=200901/200901 fqs=5128 
	
NMI backtrace for cpu 0
CPU: 0 PID: 12715 Comm: syz-executor5 Not tainted 4.14.90+ #29
(detected by 1, t=10522 jiffies, g=46873, c=46872, q=373)
Call Trace:
 <IRQ>
 __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:158 [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:3382 [inline]
 rcu_pending kernel/rcu/tree.c:3444 [inline]
 rcu_check_callbacks.cold.56+0x478/0xd99 kernel/rcu/tree.c:2784
 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/0x600 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787
 </IRQ>
RIP: 0010:memcpy+0x3e/0x50 mm/kasan/kasan.c:306
RSP: 0018:ffff88817db1f2d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffffed1038d774d7 RBX: ffff88817db1f5f8 RCX: ffffffff981e9338
RDX: 0000000000000008 RSI: ffff88817db1f3c0 RDI: ffff8881c6bba6b0
RBP: ffff8881c6bba6b0 R08: ffffed1038d774d7 R09: ffffed1038d774d6
R10: ffffed1038d774d6 R11: ffff8881c6bba6b7 R12: ffff88817db1f3c0
R13: 0000000000000008 R14: ffff88817db1f3c8 R15: dffffc0000000000
 memcpy include/linux/string.h:344 [inline]
 memcpy_common kernel/events/internal.h:172 [inline]
 __output_copy kernel/events/internal.h:176 [inline]
 perf_output_read_group kernel/events/core.c:5876 [inline]
 perf_output_read+0x688/0xfb0 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:181
RSP: 0018:ffff88817db1fb98 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000100
RDX: 0000000000001000 RSI: 0000000020e70000 RDI: ffff888177764f00
RBP: 0000000020e6f100 R08: 0000000000000000 R09: 0000000000000040
R10: ffffed102eeec9ff R11: ffff888177764fff R12: ffff888177764000
R13: 00007ffffffff000 R14: 0000000020e70100 R15: ffff888177764000
 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:1784 [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: 0033:0x4579b9
RSP: 002b:00007f0be254bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9
RDX: 00000000fffffdbc RSI: 0000000020000100 RDI: 0000000000000007
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0be254c6d4
R13: 00000000004c367d R14: 00000000004db550 R15: 00000000ffffffff
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12715 Comm: syz-executor5 Not tainted 4.14.90+ #29
task: ffff88819677af00 task.stack: ffff88817db18000
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:86 [inline]
RIP: 0010:native_queued_spin_lock_slowpath+0x99/0x760 kernel/locking/qspinlock.c:313
RSP: 0018:ffff8881db807cd8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffffffff9a2d8440 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 1ffffffff34c7101
RBP: 0000000000000003 R08: 0000000000002d28 R09: ffffffff9b2e3120
R10: ffff88819677b7d0 R11: 0000000000000001 R12: fffffbfff345b088
R13: 0000000000000001 R14: ffffffff9a2d8440 R15: ffffffff9a2d8440
FS:  00007f0be254c700(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e70000 CR3: 00000001d45d8001 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:669 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:52 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:90 [inline]
 do_raw_spin_lock+0x139/0x1c0 kernel/locking/spinlock_debug.c:113
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline]
 _raw_spin_lock_irqsave+0x49/0x50 kernel/locking/spinlock.c:160
 print_cpu_stall kernel/rcu/tree.c:1544 [inline]
 check_cpu_stall kernel/rcu/tree.c:1610 [inline]
 __rcu_pending kernel/rcu/tree.c:3382 [inline]
 rcu_pending kernel/rcu/tree.c:3444 [inline]
 rcu_check_callbacks.cold.56+0x480/0xd99 kernel/rcu/tree.c:2784
 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/0x600 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0x84/0x90 arch/x86/entry/entry_64.S:787
 </IRQ>
RIP: 0010:memcpy+0x3e/0x50 mm/kasan/kasan.c:306
RSP: 0018:ffff88817db1f2d8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffffed1038d774d7 RBX: ffff88817db1f5f8 RCX: ffffffff981e9338
RDX: 0000000000000008 RSI: ffff88817db1f3c0 RDI: ffff8881c6bba6b0
RBP: ffff8881c6bba6b0 R08: ffffed1038d774d7 R09: ffffed1038d774d6
R10: ffffed1038d774d6 R11: ffff8881c6bba6b7 R12: ffff88817db1f3c0
R13: 0000000000000008 R14: ffff88817db1f3c8 R15: dffffc0000000000
 memcpy include/linux/string.h:344 [inline]
 memcpy_common kernel/events/internal.h:172 [inline]
 __output_copy kernel/events/internal.h:176 [inline]
 perf_output_read_group kernel/events/core.c:5876 [inline]
 perf_output_read+0x688/0xfb0 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:181
RSP: 0018:ffff88817db1fb98 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000100
RDX: 0000000000001000 RSI: 0000000020e70000 RDI: ffff888177764f00
RBP: 0000000020e6f100 R08: 0000000000000000 R09: 0000000000000040
R10: ffffed102eeec9ff R11: ffff888177764fff R12: ffff888177764000
R13: 00007ffffffff000 R14: 0000000020e70100 R15: ffff888177764000
 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:1784 [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: 0033:0x4579b9
RSP: 002b:00007f0be254bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004579b9
RDX: 00000000fffffdbc RSI: 0000000020000100 RDI: 0000000000000007
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0be254c6d4
R13: 00000000004c367d R14: 00000000004db550 R15: 00000000ffffffff
Code: 02 a9 00 00 00 80 74 53 49 89 dc 48 89 dd 41 bd 01 00 00 00 49 c1 ec 03 83 e5 07 48 b8 00 00 00 00 00 fc ff df 49 01 c4 83 c5 03 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 91 05 00 00 8b 03 85