rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=5f2/1/0x4000000000000000 softirq=20380/20380 fqs=5248 
	(t=10502 jiffies g=29485 q=1155)
NMI backtrace for cpu 0
CPU: 0 PID: 14100 Comm: syz-executor.0 Not tainted 5.11.0-rc6-next-20210205-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/nmi.h:165 [inline]
 rcu_dump_cpu_stacks+0x222/0x2a7 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/rcu/tree_stall.h:341
 print_cpu_stall syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/rcu/tree.c:3787 [inline]
 rcu_sched_clock_irq.cold+0x522/0x1252 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/rcu/tree.c:2598
 update_process_times+0x16d/0x200 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/tick-sched.c:1369
 __run_hrtimer syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/kernel/apic/apic.c:1102
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xbd/0x100 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/idtentry.h:629
RIP: 0010:bytes_is_nonzero syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:177 [inline]
RIP: 0010:kasan_check_range+0xd0/0x180 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/kasan/generic.c:186
Code: eb 09 48 83 c0 01 48 39 d0 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea <eb> 09 48 83 c0 01 48 39 d0 74 50 80 38 00 74 f2 eb d4 41 bc 08 00
RSP: 0018:ffffc9000b6d7078 EFLAGS: 00000286
RAX: ffffed100ccfd817 RBX: ffffed100ccfd818 RCX: ffffffff818f85ba
RDX: ffffed100ccfd818 RSI: 0000000000000008 RDI: ffff8880667ec0b8
RBP: ffffed100ccfd817 R08: 0000000000000000 R09: ffff8880667ec0bf
R10: ffffed100ccfd817 R11: 0000000000000001 R12: ffff8880667ec0b8
R13: dffffc0000000000 R14: ffff8880667ec000 R15: 0000000000000010
 instrument_atomic_read syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/instrumented.h:71 [inline]
 atomic64_read syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/asm-generic/atomic-instrumented.h:837 [inline]
 perf_event_count syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:4263 [inline]
 perf_output_read_group syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:6729 [inline]
 perf_output_read+0xc5a/0x1310 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:6766
 perf_output_sample+0xd12/0x1be0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:6813
 __perf_event_output syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:7298 [inline]
 perf_event_output_forward+0x132/0x270 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:7312
 __perf_event_overflow+0x13c/0x370 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:8986
 perf_swevent_overflow syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9062 [inline]
 perf_swevent_event+0x347/0x550 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9090
 do_perf_sw_event syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9203 [inline]
 ___perf_sw_event+0x31a/0x570 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9234
 __perf_sw_event+0x54/0x130 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/kernel/events/core.c:9246
 perf_sw_event syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/perf_event.h:1167 [inline]
 mm_account_fault syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:4516 [inline]
 handle_mm_fault+0x5da/0x7e0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/mm/memory.c:4567
 do_user_addr_fault+0x458/0xc60 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/mm/fault.c:1371
 handle_page_fault syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/mm/fault.c:1426 [inline]
 exc_page_fault+0x9e/0x180 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/mm/fault.c:1482
 asm_exc_page_fault+0x1e/0x30 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/idtentry.h:580
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/lib/copy_user_64.S:206
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 89 d1 83 f8
RSP: 0018:ffffc9000b6d7918 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000006fcb
RDX: 0000000000008000 RSI: 0000000020f3e000 RDI: ffff888066459035
RBP: ffff888066458000 R08: 0000000000000001 R09: ffff88806645ffff
R10: ffffed100cc8bfff R11: 0000000000000000 R12: 0000000020f3cfcb
R13: 0000000020f44fcb R14: 0000000000000000 R15: 0000000000008000
 copy_user_generic syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./arch/x86/include/asm/uaccess_64.h:52 [inline]
 copyin.part.0+0xe4/0x110 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/iov_iter.c:200
 copyin syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/iov_iter.c:850 [inline]
 _copy_from_iter_full+0x2a6/0x1120 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/lib/iov_iter.c:850
 copy_from_iter_full syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/linux/uio.h:164 [inline]
 skb_do_copy_data_nocache+0x145/0x2c0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/net/sock.h:2067
 skb_copy_to_page_nocache syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/./include/net/sock.h:2093 [inline]
 tcp_sendmsg_locked+0x1360/0x2e40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/ipv4/tcp.c:1368
 tcp_sendmsg+0x2b/0x40 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/ipv4/tcp.c:1465
 inet_sendmsg+0x99/0xe0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/ipv4/af_inet.c:821
 sock_sendmsg_nosec syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:674
 __sys_sendto+0x21c/0x320 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:1977
 __do_sys_sendto syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:1989 [inline]
 __se_sys_sendto syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:1985 [inline]
 __x64_sys_sendto+0xdd/0x1b0 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/net/socket.c:1985
 do_syscall_64+0x2d/0x70 syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0d9ec19188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000004
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff175056cf R14: 00007f0d9ec19300 R15: 0000000000022000