rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (1 GPs behind) idle=4804/1/0x4000000000000000 softirq=34280/34281 fqs=4705
rcu: hardirqs softirqs csw/system
rcu: number: 1294757 0 0
rcu: cputime: 17615 34863 71 ==> 52510(ms)
rcu: (t=10503 jiffies g=43169 q=2208 ncpus=2)
CPU: 0 PID: 10895 Comm: syz.4.1406 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:413
Code: 8a e8 3e fa 15 09 65 66 8b 05 86 22 b2 7e 66 85 c0 75 54 bf 01 00 00 00 e8 67 db 09 00 e8 62 60 3a 00 fb 65 8b 05 52 22 b2 7e <85> c0 75 05 e8 31 08 af ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc90000007400 EFLAGS: 00000286
RAX: 0000000000000101 RBX: 0000000000000200 RCX: 64ca8045e1047800
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80
RBP: ffffc90000007490 R08: ffffffff90d945cf R09: 1ffffffff21b28b9
R10: dffffc0000000000 R11: fffffbfff21b28ba R12: ffffffff893843e5
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000000e80
FS: 00007f06ac3f66c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000005bd5f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
local_bh_enable include/linux/bottom_half.h:33 [inline]
ip6t_do_table+0x1344/0x1500 net/ipv6/netfilter/ip6_tables.c:375
ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:49 [inline]
ip6table_mangle_hook+0x258/0x6e0 net/ipv6/netfilter/ip6table_mangle.c:71
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0x136a/0x14b0 net/ipv6/ndisc.c:513
ndisc_send_ns net/ipv6/ndisc.c:671 [inline]
ndisc_solicit+0x43f/0x610 net/ipv6/ndisc.c:-1
neigh_probe net/core/neighbour.c:1080 [inline]
neigh_timer_handler+0xaad/0xff0 net/core/neighbour.c:1162
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_acquire+0x1f2/0x410 kernel/locking/lockdep.c:5758
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00
RSP: 0018:ffffc9001a6cf920 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 64ca8045e1047800
RDX: 0000000000000000 RSI: ffffffff8aaace60 RDI: ffffffff8afc6f80
RBP: ffffc9001a6cfa40 R08: dffffc0000000000 R09: 1ffffffff21b28bb
R10: dffffc0000000000 R11: fffffbfff21b28bc R12: 1ffff920034d9f30
R13: ffffc90000a2eca0 R14: 0000000000000246 R15: dffffc0000000000
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:351 [inline]
futex_q_lock+0x1aa/0x250 kernel/futex/core.c:542
futex_wait_setup+0xdd/0x260 kernel/futex/waitwake.c:607
futex_wait+0x172/0x530 kernel/futex/waitwake.c:651
do_futex+0x2ff/0x3e0 kernel/futex/syscalls.c:134
__do_sys_futex kernel/futex/syscalls.c:211 [inline]
__se_sys_futex+0x36f/0x3f0 kernel/futex/syscalls.c:192
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f06ae18f749
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:00007f06ac3f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f06ae3e5fa8 RCX: 00007f06ae18f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f06ae3e5fa8
RBP: 00007f06ae3e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06ae3e6038 R14: 00007ffe893ad690 R15: 00007ffe893ad778