rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=83d/1/0x4000000000000000 softirq=10913/10915 fqs=4226
(t=10500 jiffies g=14585 q=987)
NMI backtrace for cpu 0
CPU: 0 PID: 5947 Comm: syz.2.462 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
rcu_pending kernel/rcu/tree.c:3936 [inline]
rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619
update_process_times+0x193/0x200 kernel/time/timer.c:1818
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_next_frame+0x8ef/0x1d90 arch/x86/kernel/unwind_orc.c:-1
Code: c0 0f 85 20 0f 00 00 4c 89 fa 48 c1 ea 03 42 0f b6 04 2a 84 c0 0f 85 2c 0f 00 00 41 0f b6 46 01 83 e0 03 ff 24 c5 10 80 08 8a <48> 89 54 24 50 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 80 3c 28 00 74
RSP: 0018:ffffc90000006e48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000006f08 RCX: ffffffff8dd7461c
RDX: 1ffffffff1ce4fe3 RSI: ffffffff8e727f16 RDI: ffffc900000074e8
RBP: ffffc90000006f50 R08: 0000000000000001 R09: 0000000000000005
R10: fffff52000000ded R11: 1ffff92000000deb R12: 1ffffffff1ce4fe3
R13: dffffc0000000000 R14: ffffffff8e727f1a R15: ffffffff8e727f1b
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kmem_cache_free+0x8f/0x210 mm/slub.c:3520
kfree_skb include/linux/skbuff.h:1118 [inline]
batadv_interface_tx+0x82a/0x1410 net/batman-adv/soft-interface.c:388
__netdev_start_xmit include/linux/netdevice.h:5036 [inline]
netdev_start_xmit include/linux/netdevice.h:5050 [inline]
xmit_one net/core/dev.c:3649 [inline]
dev_hard_start_xmit+0x2a5/0x7e0 net/core/dev.c:3665
__dev_queue_xmit+0x19df/0x2ed0 net/core/dev.c:4288
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip6_finish_output2+0x1035/0x1500 net/ipv6/ip6_output.c:130
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xbea/0x14a0 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3956
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_schedule_irq+0xac/0x150 kernel/sched/core.c:6799
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 70 bf 01 00 00 00 e8 af 44 a7 f7 e8 fa bd d3 f7 fb bf 01 00 00 00 ef b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc900025ef700 EFLAGS: 00000286
RAX: 72c20c9650cb5200 RBX: 0000000000000000 RCX: 72c20c9650cb5200
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: 0000000000000001
RBP: ffffc900025ef7a0 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920004bdee0
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:ex_to_insn lib/extable.c:20 [inline]
RIP: 0010:cmp_ex_search+0x3f/0x70 lib/extable.c:97
Code: e8 c6 35 7c fd 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 50 9e c0 fd 4d 8b 36 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 17 48 63 03 48 01 d8 49 39 c6 0f 97 c0 1c 00 0f be c0 5b
RSP: 0018:ffffc900025ef860 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffffffff8bd2e8ec RCX: ffff88805cb95940
RDX: 0000000000000000 RSI: ffffffff8bd2e8ec RDI: ffffc900025ef8e0
RBP: ffffffff8bd2e8ec R08: ffffffff83fb9630 R09: ffffed1008ba07f8
R10: ffffed1008ba07f8 R11: 1ffff11008ba07f7 R12: ffffffff8bd2b7c0
R13: ffffc900025ef8e0 R14: ffffffff84005b59 R15: dffffc0000000000
__inline_bsearch include/linux/bsearch.h:15 [inline]
bsearch+0x45/0xb0 lib/bsearch.c:33
search_extable+0x8c/0xd0 lib/extable.c:116
search_kernel_exception_table kernel/extable.c:48 [inline]
search_exception_tables+0x36/0x60 kernel/extable.c:57
fixup_exception+0x4a/0x14a0 arch/x86/mm/extable.c:156
kernelmode_fixup_or_oops+0x6c/0xd0 arch/x86/mm/fault.c:719
__bad_area_nosemaphore+0x11c/0x5a0 arch/x86/mm/fault.c:766
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:92
Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a
RSP: 0018:ffffc900025efc00 EFLAGS: 00050203
RAX: ffffffff83dae101 RBX: 0000000000000014 RCX: 0000000000000002
RDX: 0000000000000004 RSI: ffffffff8bc513d0 RDI: 0000000000000040
RBP: 0000000000000000 R08: 7a616c5f34747865 R09: fffffbfff178a27d
R10: fffffbfff178a27d R11: 1ffffffff178a27a R12: 00007ffffffff000
R13: 0000000000000054 R14: ffffffff8bc513d0 R15: 0000000000000040
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
_copy_to_user+0xf0/0x130 lib/usercopy.c:40
copy_to_user include/linux/uaccess.h:200 [inline]
bpf_task_fd_query_copy+0x1d0/0x410 kernel/bpf/syscall.c:4107
bpf_task_fd_query+0x566/0x620 kernel/bpf/syscall.c:-1
__sys_bpf+0x4a4/0x670 kernel/bpf/syscall.c:4708
__do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fde06d7d749
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fde04fe4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fde06fd3fa0 RCX: 00007fde06d7d749
RDX: 0000000000000011 RSI: 0000200000000380 RDI: 0000000000000014
RBP: 00007fde06e01f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fde06fd4038 R14: 00007fde06fd3fa0 R15: 00007ffdb0f1f208