rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (10500 ticks this GP) idle=fdd/1/0x4000000000000000 softirq=35851/35851 fqs=5234
(t=10502 jiffies g=59973 q=3287)
NMI backtrace for cpu 1
CPU: 1 PID: 19144 Comm: syz-executor.4 Not tainted 5.14.0-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+0xcd/0x134 lib/dump_stack.c:105
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3880 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2599
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:perf_output_read_group kernel/events/core.c:6894 [inline]
RIP: 0010:perf_output_read+0xbfa/0x1310 kernel/events/core.c:6935
Code: 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 74 08 3c 03 0f 8e b3 05 00 00 48 8b 44 24 10 bf 01 00 00 00 8b a8 a8 00 00 00 <89> ee e8 9f 5e e2 ff 83 fd 01 0f 84 a5 02 00 00 e8 e1 55 e2 ff 48
RSP: 0018:ffffc90002047098 EFLAGS: 00000246
RAX: ffff88802d468040 RBX: ffffc900020473e0 RCX: ffffc900123d0000
RDX: 0000000000040000 RSI: ffffffff8192f42b RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: ffff888017e16a97
R10: ffffffff8192f6c4 R11: 0000000000000001 R12: ffffc900020471e0
R13: dffffc0000000000 R14: ffff88802d468040 R15: 0000000000000010
perf_output_sample+0xd12/0x1d80 kernel/events/core.c:6982
__perf_event_output kernel/events/core.c:7467 [inline]
perf_event_output_forward+0x119/0x280 kernel/events/core.c:7481
__perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9153
perf_swevent_overflow kernel/events/core.c:9229 [inline]
perf_swevent_event+0x347/0x550 kernel/events/core.c:9257
do_perf_sw_event kernel/events/core.c:9370 [inline]
___perf_sw_event+0x31a/0x570 kernel/events/core.c:9401
__perf_sw_event+0x54/0x130 kernel/events/core.c:9413
perf_sw_event include/linux/perf_event.h:1171 [inline]
mm_account_fault mm/memory.c:4754 [inline]
handle_mm_fault+0x5ef/0x790 mm/memory.c:4805
do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
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 a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 83 f8
RSP: 0018:ffffc90002047910 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000004fcb
RDX: 0000000000008000 RSI: 0000000020fd0000 RDI: ffff888030663035
RBP: ffff888030660000 R08: 0000000000000001 R09: ffff888030667fff
R10: ffffed10060ccfff R11: 0000000000000000 R12: 0000000020fccfcb
R13: 0000000020fd4fcb R14: 0000000000000000 R15: ffffc90002047d70
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:168
copyin lib/iov_iter.c:718 [inline]
_copy_from_iter+0x2a3/0x1320 lib/iov_iter.c:718
copy_from_iter include/linux/uio.h:148 [inline]
copy_from_iter_full include/linux/uio.h:154 [inline]
skb_do_copy_data_nocache+0x145/0x310 include/net/sock.h:2080
skb_copy_to_page_nocache include/net/sock.h:2106 [inline]
tcp_sendmsg_locked+0x1239/0x2f10 net/ipv4/tcp.c:1361
tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1461
inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
__sys_sendto+0x21c/0x320 net/socket.c:2036
__do_sys_sendto net/socket.c:2048 [inline]
__se_sys_sendto net/socket.c:2044 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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:00007f100ecd6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000007
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fffb02195df R14: 00007f100ecd6300 R15: 0000000000022000
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 48 89 f8 mov %rdi,%rax
5: 48 c1 e8 03 shr $0x3,%rax
9: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
e: 84 c0 test %al,%al
10: 74 08 je 0x1a
12: 3c 03 cmp $0x3,%al
14: 0f 8e b3 05 00 00 jle 0x5cd
1a: 48 8b 44 24 10 mov 0x10(%rsp),%rax
1f: bf 01 00 00 00 mov $0x1,%edi
24: 8b a8 a8 00 00 00 mov 0xa8(%rax),%ebp
* 2a: 89 ee mov %ebp,%esi <-- trapping instruction
2c: e8 9f 5e e2 ff callq 0xffe25ed0
31: 83 fd 01 cmp $0x1,%ebp
34: 0f 84 a5 02 00 00 je 0x2df
3a: e8 e1 55 e2 ff callq 0xffe25620
3f: 48 rex.W