rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=942/1/0x4000000000000002 softirq=73888/73888 fqs=4802 (t=10500 jiffies g=107557 q=98491) NMI backtrace for cpu 1 CPU: 1 PID: 21920 Comm: syz-executor.4 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:165 [inline] rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq.cold+0x55d/0xd00 kernel/rcu/tree.c:2296 update_process_times+0x25/0x60 kernel/time/timer.c:1727 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:28 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:184 [inline] RIP: 0010:check_memory_region+0x33/0x190 mm/kasan/generic.c:193 Code: 49 89 fa 41 54 0f b6 d2 49 01 f2 55 53 0f 82 20 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 0d 01 00 00 49 83 ea 01 <48> 89 fb 48 b8 00 00 00 00 00 fc ff df 4d 89 d3 48 c1 eb 03 49 c1 RSP: 0018:ffffc900065ef120 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: ffff7fffffffffff RBX: 00000000000001c7 RCX: ffffffff818c0969 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880988e80b8 RBP: ffff8880988e80b8 R08: ffff88808903a5c0 R09: ffffed101311d017 R10: ffff8880988e80bf R11: ffffed101311d016 R12: dffffc0000000000 R13: ffff8880988e8000 R14: ffffc900065ef298 R15: ffffc900065ef498 instrument_atomic_read include/linux/instrumented.h:56 [inline] atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline] perf_event_count kernel/events/core.c:4229 [inline] perf_output_read_group kernel/events/core.c:6692 [inline] perf_output_read+0xbe9/0x11f0 kernel/events/core.c:6729 perf_output_sample+0xe17/0x1c20 kernel/events/core.c:6776 __perf_event_output kernel/events/core.c:7157 [inline] perf_event_output_forward+0x12f/0x270 kernel/events/core.c:7171 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:8736 perf_swevent_overflow+0xac/0x150 kernel/events/core.c:8812 perf_swevent_event+0x1e9/0x2e0 kernel/events/core.c:8845 do_perf_sw_event kernel/events/core.c:8953 [inline] ___perf_sw_event+0x31c/0x570 kernel/events/core.c:8984 __perf_sw_event+0x4b/0xa0 kernel/events/core.c:8996 perf_sw_event include/linux/perf_event.h:1158 [inline] do_user_addr_fault arch/x86/mm/fault.c:1501 [inline] do_page_fault+0xb07/0x13da arch/x86/mm/fault.c:1535 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:205 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 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4 RSP: 0018:ffffc900065efa58 EFLAGS: 00010206 RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000007fcb RDX: 0000000000008000 RSI: 0000000020fc5000 RDI: ffff8880a1d60035 RBP: ffff8880a1d60000 R08: ffffed10143ad000 R09: 0000000000000000 R10: ffff8880a1d67fff R11: ffffed10143acfff R12: 0000000020fc4fcb R13: 0000000020fccfcb 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:68 [inline] copyin+0x107/0x140 lib/iov_iter.c:152 _copy_from_iter_full+0x20a/0x870 lib/iov_iter.c:790 copy_from_iter_full include/linux/uio.h:156 [inline] skb_do_copy_data_nocache include/net/sock.h:2036 [inline] skb_copy_to_page_nocache include/net/sock.h:2062 [inline] tcp_sendmsg_locked+0x131a/0x3210 net/ipv4/tcp.c:1335 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1433 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:807 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 __sys_sendto+0x220/0x330 net/socket.c:2000 __do_sys_sendto net/socket.c:2012 [inline] __se_sys_sendto net/socket.c:2008 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2008 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7259766c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000005011c0 RCX: 000000000045ca29 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0f0000000000e803 R10: 0000000000000240 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a0e R14: 00000000004cce56 R15: 00007f72597676d4