syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=f26/1/0x4000000000000002 softirq=22656/22656 fqs=4687 
rcu: 	 (t=10500 jiffies g=14577 q=17721)
NMI backtrace for cpu 1
CPU: 1 PID: 10893 Comm: syz-executor650 Not tainted 4.19.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:bytes_is_nonzero mm/kasan/kasan.c:169 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/kasan.c:184 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/kasan.c:210 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/kasan.c:241 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:257 [inline]
RIP: 0010:check_memory_region+0xbf/0x170 mm/kasan/kasan.c:267
Code: 50 08 eb 09 48 83 c0 01 48 39 d0 74 0e 80 38 00 74 f2 48 85 c0 0f 85 9c 00 00 00 5b 5d 41 5c c3 48 85 d2 74 f6 48 01 ea eb 09 <48> 83 c0 01 48 39 d0 74 e8 80 38 00 74 f2 eb d8 41 bc 08 00 00 00
RSP: 0018:ffff888096c2f118 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffffed1012d85e53 RBX: ffffed1012d85e54 RCX: ffffffff81760a6e
RDX: ffffed1012d85e54 RSI: 0000000000000010 RDI: ffff888096c2f290
RBP: ffffed1012d85e52 R08: 0000000000000000 R09: ffffed1012d85e53
R10: ffff888096c2f29f R11: ffffffff8c65e05b R12: 0000000000000010
R13: ffff888096c2f290 R14: 1ffff11012d85e99 R15: 0000000000000010
 memcpy+0x20/0x50 mm/kasan/kasan.c:302
 memcpy include/linux/string.h:377 [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:6197 [inline]
 perf_output_read+0xd2e/0x1270 kernel/events/core.c:6230
 perf_output_sample+0xc1b/0x18f0 kernel/events/core.c:6272
 __perf_event_output kernel/events/core.c:6597 [inline]
 perf_event_output_forward+0x12f/0x270 kernel/events/core.c:6610
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7883
 perf_swevent_overflow kernel/events/core.c:7959 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:7987
 do_perf_sw_event kernel/events/core.c:8100 [inline]
 ___perf_sw_event+0x309/0x570 kernel/events/core.c:8131
 __perf_sw_event+0x58/0x120 kernel/events/core.c:8143
 perf_sw_event include/linux/perf_event.h:1069 [inline]
 __do_page_fault+0x80e/0xd60 arch/x86/mm/fault.c:1453
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 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:ffff888096c2fa50 EFLAGS: 00010202
RAX: ffffed1012a88f50 RBX: 0000000000007a80 RCX: 0000000000004fcb
RDX: 0000000000007a80 RSI: 0000000020f00000 RDI: ffff888095442ab5
RBP: 0000000020efd54b R08: 0000000000000001 R09: ffffed1012a88f4f
R10: ffff888095447a7f R11: 0000000000000000 R12: ffff888095440000
R13: 0000000020f04fcb R14: 00007ffffffff000 R15: 0000000000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:71 [inline]
 copyin+0xcd/0xf0 lib/iov_iter.c:146
 _copy_from_iter_full+0x1df/0x7c0 lib/iov_iter.c:724
 copy_from_iter_full include/linux/uio.h:124 [inline]
 skb_do_copy_data_nocache include/net/sock.h:1968 [inline]
 skb_copy_to_page_nocache include/net/sock.h:1994 [inline]
 tcp_sendmsg_locked+0x1261/0x2f60 net/ipv4/tcp.c:1364
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1462
 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xc3/0x120 net/socket.c:632
 __sys_sendto+0x21a/0x320 net/socket.c:1787
 __do_sys_sendto net/socket.c:1799 [inline]
 __se_sys_sendto net/socket.c:1795 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x449289
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:00007f1d7629f308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000004cf508 RCX: 0000000000449289
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00000000004cf500 R08: 0000000000000000 R09: 0000000000000053
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000049e484
R13: 00007ffed34c40df R14: 00007f1d7629f400 R15: 0000000000022000