rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=bd2/1/0x4000000000000000 softirq=18627/18628 fqs=5077 
	(t=10500 jiffies g=28013 q=3136)
NMI backtrace for cpu 0
CPU: 0 PID: 12168 Comm: syz-executor.1 Not tainted 5.11.0-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:79 [inline]
 dump_stack+0xfa/0x151 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x222/0x2a7 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:622 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:697 [inline]
 rcu_pending kernel/rcu/tree.c:3830 [inline]
 rcu_sched_clock_irq.cold+0x4f7/0x11dd kernel/rcu/tree.c:2650
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 cc 14 00 00 85 c0 74 2b 8b 82 a8 14 00 00 <83> f8 02 75 20 48 8b 8a b0 14 00 00 8b 92 ac 14 00 00 48 8b 01 48
RSP: 0018:ffffc900021c7110 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffc900021c7460 RCX: 0000000000000000
RDX: ffff8880276641c0 RSI: ffffffff81901401 RDI: 0000000000000003
RBP: 0000000000000008 R08: 0000000000000000 R09: ffff88805cb3f0bf
R10: ffffffff81901352 R11: 0000000000000001 R12: ffffc900021c7250
R13: dffffc0000000000 R14: 1ffff92000438e91 R15: ffff88805cb3f000
 __output_copy kernel/events/internal.h:178 [inline]
 perf_output_read_group kernel/events/core.c:6733 [inline]
 perf_output_read+0xd41/0x1310 kernel/events/core.c:6766
 perf_output_sample+0xd12/0x1be0 kernel/events/core.c:6813
 __perf_event_output kernel/events/core.c:7298 [inline]
 perf_event_output_forward+0x132/0x270 kernel/events/core.c:7312
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:8986
 perf_swevent_overflow kernel/events/core.c:9062 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9090
 do_perf_sw_event kernel/events/core.c:9203 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9234
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9246
 perf_sw_event include/linux/perf_event.h:1167 [inline]
 mm_account_fault mm/memory.c:4516 [inline]
 handle_mm_fault+0x5da/0x7e0 mm/memory.c:4567
 do_user_addr_fault+0x483/0x1210 arch/x86/mm/fault.c:1384
 handle_page_fault arch/x86/mm/fault.c:1469 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1525
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 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:ffffc900021c79c8 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000002fcb
RDX: 0000000000008000 RSI: 0000000020f9a000 RDI: ffff88805b2b5035
RBP: ffff88805b2b0000 R08: 0000000000000001 R09: ffff88805b2b7fff
R10: ffffed100b656fff R11: 0000000000000000 R12: 0000000020f94fcb
R13: 0000000020f9cfcb R14: 0000000000000000 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:52 [inline]
 copyin.part.0+0xe4/0x110 lib/iov_iter.c:157
 copyin lib/iov_iter.c:795 [inline]
 _copy_from_iter_full+0x22c/0x850 lib/iov_iter.c:795
 copy_from_iter_full include/linux/uio.h:155 [inline]
 skb_do_copy_data_nocache+0x145/0x2c0 include/net/sock.h:2067
 skb_copy_to_page_nocache include/net/sock.h:2093 [inline]
 tcp_sendmsg_locked+0x1360/0x2e40 net/ipv4/tcp.c:1360
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 __sys_sendto+0x21c/0x320 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465ef9
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:00007f09ff0b6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000053
R10: 00000000000d91e0 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffff3ef2fbf R14: 00007f09ff0b6300 R15: 0000000000022000