rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=f3a/1/0x4000000000000002 softirq=17007/17007 fqs=5226 
rcu: 	 (t=10500 jiffies g=21209 q=17664)
NMI backtrace for cpu 0
CPU: 0 PID: 12341 Comm: syz-executor281 Not tainted 4.19.172-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace syzkaller/managers/linux-4-19/kernel/./include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:1340
 print_cpu_stall syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:1550 [inline]
 __rcu_pending syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:3293 [inline]
 rcu_pending syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 syzkaller/managers/linux-4-19/kernel/kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 syzkaller/managers/linux-4-19/kernel/kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 syzkaller/managers/linux-4-19/kernel/kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 syzkaller/managers/linux-4-19/kernel/kernel/time/tick-sched.c:1278
 __run_hrtimer syzkaller/managers/linux-4-19/kernel/kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 syzkaller/managers/linux-4-19/kernel/kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 syzkaller/managers/linux-4-19/kernel/kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt syzkaller/managers/linux-4-19/kernel/arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 syzkaller/managers/linux-4-19/kernel/arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:memcpy_erms+0x8/0x10 syzkaller/managers/linux-4-19/kernel/arch/x86/lib/memcpy_64.S:56
Code: 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 <c3> 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35
RSP: 0018:ffff8880a67cf150 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8880aa9b6148 RBX: ffff8880a67cf4a0 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff8880a67cf2a0 RDI: ffff8880aa9b6158
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1015536c2a
R10: ffff8880aa9b6157 R11: ffffffff8c65d01b R12: ffff8880a67cf290
R13: dffffc0000000000 R14: 1ffff11014cf9e99 R15: 0000000000000010
 memcpy syzkaller/managers/linux-4-19/kernel/./include/linux/string.h:373 [inline]
 memcpy_common syzkaller/managers/linux-4-19/kernel/kernel/events/internal.h:172 [inline]
 __output_copy syzkaller/managers/linux-4-19/kernel/kernel/events/internal.h:176 [inline]
 perf_output_read_group syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:6197 [inline]
 perf_output_read+0xd2e/0x1270 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:6230
 perf_output_sample+0xc1b/0x18f0 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:6272
 __perf_event_output syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:6597 [inline]
 perf_event_output_forward+0x12f/0x270 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:6610
 __perf_event_overflow+0x13c/0x370 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:7883
 perf_swevent_overflow syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:7959 [inline]
 perf_swevent_event+0x347/0x550 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:7987
 do_perf_sw_event syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:8100 [inline]
 ___perf_sw_event+0x309/0x570 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:8131
 __perf_sw_event+0x58/0x120 syzkaller/managers/linux-4-19/kernel/kernel/events/core.c:8143
 perf_sw_event syzkaller/managers/linux-4-19/kernel/./include/linux/perf_event.h:1069 [inline]
 __do_page_fault+0x80e/0xd60 syzkaller/managers/linux-4-19/kernel/arch/x86/mm/fault.c:1453
 page_fault+0x1e/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:1205
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 syzkaller/managers/linux-4-19/kernel/arch/x86/lib/copy_user_64.S:181
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 83
RSP: 0018:ffff8880a67cfa50 EFLAGS: 00010206
RAX: ffffed1013a63ea0 RBX: 0000000000007500 RCX: 0000000000005fcb
RDX: 0000000000007500 RSI: 0000000020ef7000 RDI: ffff88809d319535
RBP: 0000000020ef5acb R08: 0000000000000001 R09: ffffed1013a63e9f
R10: ffff88809d31f4ff R11: 0000000000000000 R12: ffff88809d318000
R13: 0000000020efcfcb R14: 00007ffffffff000 R15: 0000000000000000
 copy_user_generic syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/uaccess_64.h:71 [inline]
 copyin+0xcd/0xf0 syzkaller/managers/linux-4-19/kernel/lib/iov_iter.c:146
 _copy_from_iter_full+0x1df/0x7c0 syzkaller/managers/linux-4-19/kernel/lib/iov_iter.c:724
 copy_from_iter_full syzkaller/managers/linux-4-19/kernel/./include/linux/uio.h:124 [inline]
 skb_do_copy_data_nocache syzkaller/managers/linux-4-19/kernel/./include/net/sock.h:1968 [inline]
 skb_copy_to_page_nocache syzkaller/managers/linux-4-19/kernel/./include/net/sock.h:1994 [inline]
 tcp_sendmsg_locked+0x1261/0x2f60 syzkaller/managers/linux-4-19/kernel/net/ipv4/tcp.c:1364
 tcp_sendmsg+0x2b/0x40 syzkaller/managers/linux-4-19/kernel/net/ipv4/tcp.c:1462
 inet_sendmsg+0x132/0x5a0 syzkaller/managers/linux-4-19/kernel/net/ipv4/af_inet.c:798
 sock_sendmsg_nosec syzkaller/managers/linux-4-19/kernel/net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 syzkaller/managers/linux-4-19/kernel/net/socket.c:632
 __sys_sendto+0x21a/0x320 syzkaller/managers/linux-4-19/kernel/net/socket.c:1787
 __do_sys_sendto syzkaller/managers/linux-4-19/kernel/net/socket.c:1799 [inline]
 __se_sys_sendto syzkaller/managers/linux-4-19/kernel/net/socket.c:1795 [inline]
 __x64_sys_sendto+0xdd/0x1b0 syzkaller/managers/linux-4-19/kernel/net/socket.c:1795
 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4491a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe1b46f1308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000004ce508 RCX: 00000000004491a9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00000000004ce500 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049d484
R13: 00007ffd5740d98f R14: 00007fe1b46f1400 R15: 0000000000022000