INFO: rcu_preempt self-detected stall on CPU 0-...: (10499 ticks this GP) idle=176/140000000000001/0 softirq=15476/15477 fqs=5234 (t=10501 jiffies g=4384 c=4383 q=28604) NMI backtrace for cpu 0 CPU: 0 PID: 9987 Comm: syz-executor212 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x464/0xd99 kernel/rcu/tree.c:2792 update_process_times+0x28/0xa0 kernel/time/timer.c:1591 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x92/0x200 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:251 [inline] RIP: 0010:check_memory_region+0x17/0x170 mm/kasan/kasan.c:267 RSP: 0018:ffff8880a0727268 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: ffff7fffffffffff RBX: 0000000000000000 RCX: ffffffff8169efd9 RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffff8880a0727360 RBP: ffff88808f2041b0 R08: 0000000000000000 R09: ffff88821fff700f R10: ffff88821fff7017 R11: 0000003efa49bf0a R12: 0000000000000010 R13: ffff8880a0727360 R14: ffff8880a0727528 R15: 0000000000000010 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:372 [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:5895 [inline] perf_output_read+0x6c9/0x1090 kernel/events/core.c:5928 perf_output_sample+0xa28/0x16f0 kernel/events/core.c:5970 __perf_event_output kernel/events/core.c:6283 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6296 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7541 perf_swevent_overflow kernel/events/core.c:7617 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7645 do_perf_sw_event kernel/events/core.c:7758 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7789 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7801 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x6c1/0xb50 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff8880a0727a78 EFLAGS: 00010206 RAX: ffffed1013b0a000 RBX: 0000000000008000 RCX: 0000000000000acb RDX: 0000000000008000 RSI: 0000000020e6d000 RDI: ffff88809d84f535 RBP: 0000000020e65acb R08: 0000000000000001 R09: ffffed1013b09fff R10: ffff88809d84ffff R11: 0000000000000000 R12: ffff88809d848000 R13: 00007ffffffff000 R14: 0000000020e6dacb R15: ffff88809d848000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x197/0x690 lib/iov_iter.c:608 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1889 [inline] skb_copy_to_page_nocache include/net/sock.h:1915 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4498a9 RSP: 002b:00007f919d024da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000006dec48 RCX: 00000000004498a9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000004 RBP: 00000000006dec40 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dec4c R13: 00007ffc0d5347ff R14: 00007f919d0259c0 R15: 0000000000000064 INFO: rcu_sched detected stalls on CPUs/tasks: 0-...: (10497 ticks this GP) idle=176/140000000000000/0 softirq=15477/15477 fqs=5233 (detected by 1, t=10548 jiffies, g=2309, c=2308, q=1238) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9987 Comm: syz-executor212 Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88808974e540 task.stack: ffff8880a0720000 RIP: 0010:__pvclock_read_cycles arch/x86/include/asm/pvclock.h:87 [inline] RIP: 0010:pvclock_clocksource_read+0x1e1/0x4f0 arch/x86/kernel/pvclock.c:87 RSP: 0018:ffff8880a0727190 EFLAGS: 00000246 RAX: 0000003f07a621c1 RBX: ffff88821fff7000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: dffffc0000000000 R08: ffff88821fff7018 R09: ffff88821fff700f R10: ffff88821fff7017 R11: ffff88821fff701b R12: ffff88821fff7003 R13: ffffed1043ffee01 R14: ffff88821fff701d R15: ffff88821fff7010 FS: 00007f919d025700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000800000001 CR3: 000000008ddc0000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_clock_read+0x1f/0x30 arch/x86/kernel/kvmclock.c:88 kvm_sched_clock_read+0x5/0x10 arch/x86/kernel/kvmclock.c:100 paravirt_sched_clock arch/x86/include/asm/paravirt.h:175 [inline] sched_clock+0x2a/0x40 arch/x86/kernel/tsc.c:228 sched_clock_cpu+0x18/0x1b0 kernel/sched/clock.c:363 local_clock include/linux/sched/clock.h:84 [inline] cpu_clock_event_update kernel/events/core.c:8828 [inline] cpu_clock_event_read+0x15/0x30 kernel/events/core.c:8861 perf_output_read_group kernel/events/core.c:5889 [inline] perf_output_read+0xc28/0x1090 kernel/events/core.c:5928 perf_output_sample+0xa28/0x16f0 kernel/events/core.c:5970 __perf_event_output kernel/events/core.c:6283 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6296 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7541 perf_swevent_overflow kernel/events/core.c:7617 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7645 do_perf_sw_event kernel/events/core.c:7758 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7789 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7801 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x6c1/0xb50 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff8880a0727a78 EFLAGS: 00010206 RAX: ffffed1013b0a000 RBX: 0000000000008000 RCX: 0000000000000acb RDX: 0000000000008000 RSI: 0000000020e6d000 RDI: ffff88809d84f535 RBP: 0000000020e65acb R08: 0000000000000001 R09: ffffed1013b09fff R10: ffff88809d84ffff R11: 0000000000000000 R12: ffff88809d848000 R13: 00007ffffffff000 R14: 0000000020e6dacb R15: ffff88809d848000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x197/0x690 lib/iov_iter.c:608 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1889 [inline] skb_copy_to_page_nocache include/net/sock.h:1915 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4498a9 RSP: 002b:00007f919d024da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000006dec48 RCX: 00000000004498a9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000004 RBP: 00000000006dec40 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dec4c R13: 00007ffc0d5347ff R14: 00007f919d0259c0 R15: 0000000000000064 Code: 03 0f b6 14 2a 40 38 f2 40 0f 9e c6 84 d2 0f 95 c2 40 84 d6 0f 85 c1 01 00 00 4c 89 d2 83 e2 07 38 d1 40 0f 9e c6 84 c9 0f 95 c2 <40> 84 d6 0f 85 a7 01 00 00 4c 89 f2 48 8b 7b 10 4c 89 f1 48 c1