rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (10499 ticks this GP) idle=7df/1/0x4000000000000000 softirq=17501/17501 fqs=5115
(t=10500 jiffies g=23885 q=2394)
NMI backtrace for cpu 1
CPU: 1 PID: 6354 Comm: syz-executor.3 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x22d/0x390 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
rcu_pending kernel/rcu/tree.c:3919 [inline]
rcu_sched_clock_irq+0x1e33/0x2bc0 kernel/rcu/tree.c:2617
update_process_times+0x197/0x200 kernel/time/timer.c:1785
tick_sched_handle kernel/time/tick-sched.c:226 [inline]
tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:memcpy_erms+0x8/0x10
Code: cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35
RSP: 0018:ffffc90004316bf8 EFLAGS: 00000202
RAX: ffff88801a06a5e0 RBX: 0000000000000010 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffffc90004316cf0 RDI: ffff88801a06a5f0
RBP: ffffc90004316d90 R08: dffffc0000000000 R09: ffffed100340d4be
R10: ffffed100340d4be R11: 0000000000000000 R12: ffffc900043170a8
R13: 0000000000000010 R14: dffffc0000000000 R15: ffffc90004317098
memcpy_common kernel/events/internal.h:174 [inline]
__output_copy kernel/events/internal.h:178 [inline]
perf_output_read_group kernel/events/core.c:6932 [inline]
perf_output_read+0x1150/0x1480 kernel/events/core.c:6965
perf_output_sample+0x338/0x23e0 kernel/events/core.c:7012
__perf_event_output kernel/events/core.c:7497 [inline]
perf_event_output_forward+0x1e1/0x2c0 kernel/events/core.c:7511
__perf_event_overflow+0x1f8/0x380 kernel/events/core.c:9211
do_perf_sw_event kernel/events/core.c:9428 [inline]
___perf_sw_event+0x465/0x640 kernel/events/core.c:9459
__perf_sw_event+0x13f/0x270 kernel/events/core.c:9471
handle_mm_fault+0x2eef/0x39e0 mm/memory.c:4819
do_user_addr_fault+0x8cc/0x10c0 arch/x86/mm/fault.c:1397
handle_page_fault arch/x86/mm/fault.c:1485 [inline]
exc_page_fault+0xa1/0x1e0 arch/x86/mm/fault.c:1541
asm_exc_page_fault+0x1e/0x30
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 83 f8 12 74
RSP: 0018:ffffc900043178b8 EFLAGS: 00050206
RAX: ffffffff840fa101 RBX: ffff888073498000 RCX: 0000000000003fcb
RDX: 0000000000008000 RSI: 0000000020e91000 RDI: ffff88807349c035
RBP: ffffc90004317a10 R08: dffffc0000000000 R09: ffffed100e694000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000
R13: 00007ffffffff000 R14: 0000000020e8cfcb R15: ffffc90004317e68
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 lib/iov_iter.c:166 [inline]
_copy_from_iter+0x33c/0x1170 lib/iov_iter.c:765
copy_from_iter include/linux/uio.h:171 [inline]
copy_from_iter_full include/linux/uio.h:177 [inline]
skb_do_copy_data_nocache include/net/sock.h:2189 [inline]
skb_copy_to_page_nocache include/net/sock.h:2215 [inline]
tcp_sendmsg_locked+0x1bed/0x48a0 net/ipv4/tcp.c:1334
tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1440
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg net/socket.c:725 [inline]
__sys_sendto+0x42e/0x5b0 net/socket.c:2040
__do_sys_sendto net/socket.c:2052 [inline]
__se_sys_sendto net/socket.c:2048 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2048
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8580a1aeb9
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:00007f857f390168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f8580b2df60 RCX: 00007f8580a1aeb9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000012
RBP: 00007f8580a7508d R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3e6ff52f R14: 00007f857f390300 R15: 0000000000022000
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: cc int3
1: cc int3
2: eb 1e jmp 0x22
4: 0f 1f 00 nopl (%rax)
7: 48 89 f8 mov %rdi,%rax
a: 48 89 d1 mov %rdx,%rcx
d: 48 c1 e9 03 shr $0x3,%rcx
11: 83 e2 07 and $0x7,%edx
14: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi)
17: 89 d1 mov %edx,%ecx
19: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
1b: c3 retq
1c: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
22: 48 89 f8 mov %rdi,%rax
25: 48 89 d1 mov %rdx,%rcx
28: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
* 2a: c3 retq <-- trapping instruction
2b: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
32: 48 89 f8 mov %rdi,%rax
35: 48 83 fa 20 cmp $0x20,%rdx
39: 72 7e jb 0xb9
3b: 40 38 fe cmp %dil,%sil
3e: 7c 35 jl 0x75