rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 4250 jiffies s: 4465 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4861 Comm: syz.5.75 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:strlen+0x3b/0x60 lib/string.c:502
Code: 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 ad 69
RSP: 0018:ffffc90000006b18 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffffffff8a8e07a1 RCX: dffffc0000000000
RDX: ffffffff8172b431 RSI: ffffffff8cb46c48 RDI: ffffffff8a8e07a0
RBP: ffffc90000006c30 R08: ffffffff8e1fc32f R09: 1ffffffff1c3f865
R10: dffffc0000000000 R11: fffffbfff1c3f866 R12: dffffc0000000000
R13: 1ffff92000000d70 R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007f656a6d76c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005000 CR3: 000000002b4fe000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __fortify_strlen include/linux/fortify-string.h:196 [inline]
 trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline]
 perf_trace_lock+0xd1/0x390 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x8ad/0x920 kernel/locking/lockdep.c:5673
 seqcount_lockdep_reader_access+0xe0/0x1d0 include/linux/seqlock.h:103
 ktime_get+0x31/0x270 kernel/time/timekeeping.c:846
 clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326
 hrtimer_interrupt+0x59d/0x9c0 kernel/time/hrtimer.c:1886
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:deref_stack_regs arch/x86/kernel/unwind_orc.c:376 [inline]
RIP: 0010:unwind_next_frame+0x104e/0x20b0 arch/x86/kernel/unwind_orc.c:551
Code: 74 08 4c 89 f7 e8 d2 34 9a 00 4d 89 3e 48 8b 04 24 48 8d b8 98 00 00 00 e8 df 19 00 00 49 89 c7 48 8b 44 24 50 42 80 3c 28 00 <4c> 8b 74 24 58 4c 8b a4 24 80 00 00 00 48 8b 6c 24 30 74 08 4c 89
RSP: 0018:ffffc900000070b0 EFLAGS: 00000246
RAX: 1ffff92000000e38 RBX: ffffc90000007188 RCX: 1ffff92000000e01
RDX: ffffc90003b87f58 RSI: ffffffff8e96f070 RDI: ffffc90003b87ff0
RBP: ffffc90003b88000 R08: 0000000000000004 R09: 0000000000000020
R10: dffffc0000000000 R11: fffff52000000e3d R12: ffffc90003b80000
R13: dffffc0000000000 R14: ffffc900000071d0 R15: 00007f656a6d7028
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 ref_tracker_alloc+0x14e/0x4b0 lib/ref_tracker.c:85
 __netdev_tracker_alloc include/linux/netdevice.h:4051 [inline]
 netdev_hold include/linux/netdevice.h:4080 [inline]
 ___neigh_create+0xc96/0x24c0 net/core/neighbour.c:658
 ip6_finish_output2+0x1525/0x15d0 net/ipv6/ip6_output.c:129
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ndisc_send_skb+0xbf1/0x14e0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d1/0x630 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x53e/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:put_recursion_context kernel/events/internal.h:228 [inline]
RIP: 0010:perf_swevent_put_recursion_context kernel/events/core.c:9733 [inline]
RIP: 0010:perf_tp_event+0xada/0xc00 kernel/events/core.c:10062
Code: 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 94 b7 2d 00 48 8b 03 49 63 ce 48 8d 9c 88 94 54 03 00 <48> 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 30
RSP: 0018:ffffc90003b87040 EFLAGS: 00000246
RAX: ffff8880b8e00000 RBX: ffff8880b8e35494 RCX: 0000000000000000
RDX: ffffc9001c946000 RSI: 000000000000db67 RDI: 000000000000db68
RBP: ffffc90003b872a8 R08: ffff88802acebb87 R09: 1ffff1100559d770
R10: dffffc0000000000 R11: ffffed100559d771 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
 perf_trace_lock+0x301/0x390 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x8ad/0x920 kernel/locking/lockdep.c:5673
 rcu_lock_release include/linux/rcupdate.h:355 [inline]
 rcu_read_unlock_sched include/linux/rcupdate.h:904 [inline]
 pfn_valid+0x3c5/0x420 include/linux/mmzone.h:1867
 page_table_check_set+0x25/0x6d0 mm/page_table_check.c:108
 page_table_check_pte_set include/linux/page_table_check.h:83 [inline]
 set_pte_at arch/x86/include/asm/pgtable.h:1009 [inline]
 do_anonymous_page mm/memory.c:4231 [inline]
 handle_pte_fault mm/memory.c:5027 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x3d65/0x3ee0 mm/memory.c:5292
 do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003b87958 EFLAGS: 00050206
RAX: ffffffff840eb701 RBX: ffffc90004669000 RCX: 000000000000ae33
RDX: 000000000000fe33 RSI: 0000200000005000 RDI: ffffc9000466e000
RBP: ffffc90003b87a90 R08: ffffc90004678e32 R09: 1ffff920008cf1c6
R10: dffffc0000000000 R11: fffff520008cf1c7 R12: 1ffff92000770f83
R13: 0000200000000000 R14: 000000000000fe33 R15: 00007ffffffef1cd
 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:183 [inline]
 _copy_from_iter+0x2a9/0x1130 lib/iov_iter.c:631
 copy_from_iter include/linux/uio.h:187 [inline]
 copy_from_iter_full include/linux/uio.h:194 [inline]
 memcpy_from_msg include/linux/skbuff.h:4044 [inline]
 netlink_sendmsg+0x755/0xbd0 net/netlink/af_netlink.c:1857
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 sock_write_iter+0x2d9/0x3e0 net/socket.c:1143
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x4b1/0xa30 fs/read_write.c:584
 ksys_write+0x14c/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f656979aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f656a6d7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6569a15fa0 RCX: 00007f656979aeb9
RDX: 000000000000fe33 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007f6569808c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6569a16038 R14: 00007f6569a15fa0 R15: 00007ffd346efe78
 </TASK>