rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2686 jiffies s: 2513 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4486 Comm: syz.1.32 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:memset+0x1/0x40 mm/kasan/shadow.c:43
Code: 08 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 31 d2 e9 c3 ec ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9 b0 ec ff ff 55 <41> 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00
RSP: 0018:ffffc900001e0270 EFLAGS: 00000046
RAX: ffffffff81a55f7f RBX: ffffc900001e0300 RCX: ffff88805bb5bc00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffffc900001e0300
RBP: ffffc900001e0508 R08: ffff8880b8f35518 R09: ffffe8ffffd34a38
R10: dffffc0000000000 R11: ffffed10171e6afa R12: dffffc0000000000
R13: 0000000000000014 R14: ffffe8ffffd34a38 R15: ffffc900001e0440
FS:  000055556c603500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000030ee2000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 perf_tp_event+0x195/0xc10 kernel/events/core.c:10051
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10042
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 12 7c 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0740 EFLAGS: 00000206
RAX: f3e32ff48e9f0e00 RBX: 1ffff9200003c0f0 RCX: f3e32ff48e9f0e00
RDX: dffffc0000000000 RSI: ffffffff8a8c1820 RDI: ffffffff8adf6220
RBP: ffffc900001e0828 R08: ffffffff90b132cf R09: 1ffffffff2162659
R10: dffffc0000000000 R11: fffffbfff216265a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 __ip_queue_xmit+0x117b/0x1c10 net/ipv4/ip_output.c:539
 __tcp_transmit_skb+0x1cc4/0x31e0 net/ipv4/tcp_output.c:1407
 tcp_delack_timer_handler+0x29d/0x440 net/ipv4/tcp_timer.c:322
 tcp_delack_timer+0x18d/0x2f0 net/ipv4/tcp_timer.c:345
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 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:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
RIP: 0010:queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline]
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline]
RIP: 0010:do_raw_spin_unlock+0x55/0x230 kernel/locking/spinlock_debug.c:140
Code: 7e 01 00 00 41 81 3e ad 4e ad de 0f 85 ed 00 00 00 48 89 df be 04 00 00 00 e8 a7 29 6e 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 <84> c0 0f 85 6e 01 00 00 83 3b 00 0f 84 e4 00 00 00 4c 8d 73 10 4d
RSP: 0018:ffffc90003537c98 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffffffff97056e00 RCX: ffffffff81654319
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff97056e00
RBP: 1ffff1100ddb9483 R08: ffffffff97056e03 R09: 1ffffffff2e0adc0
R10: dffffc0000000000 R11: fffffbfff2e0adc1 R12: dffffc0000000000
R13: 1ffff11003d514e5 R14: ffffffff97056e04 R15: ffffffff8de21178
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x1a/0x40 kernel/locking/spinlock.c:186
 sk_common_release+0xa0/0x310 net/core/sock.c:3716
 inet_release+0x139/0x180 net/ipv4/af_inet.c:430
 __sock_release net/socket.c:654 [inline]
 sock_close+0xbf/0x210 net/socket.c:1400
 __fput+0x20a/0x8b0 fs/file_table.c:320
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5df5d9e159
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:00007fff76813068 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff76813150 RCX: 00007f5df5d9e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000019193 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2e620000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5df6025fac R14: 00007f5df6025fa8 R15: 00007f5df6025fa0
 </TASK>