rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2691 jiffies s: 24793 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: 8186 Comm: syz.4.3496 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lockdep_hardirqs_on_prepare+0x62/0x770 kernel/locking/lockdep.c:4269
Code: 41 48 c7 44 24 28 0b b0 5e 8c 48 c7 44 24 30 40 ea 63 81 48 8d 5c 24 20 48 c1 eb 03 48 b8 f1 f1 f1 f1 f8 f3 f3 f3 48 89 04 13 <48> c7 c0 e4 7c 1f 8e 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 37 05 00
RSP: 0018:ffffc900000075c0 EFLAGS: 00000802
RAX: f3f3f3f8f1f1f1f1 RBX: 1ffff92000000ebc RCX: dffffc0000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffffffff8cb71fa0
RBP: ffffc90000007680 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00005555757d9500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000029336000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49
 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 92 50 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:ffffc90000007740 EFLAGS: 00000206
RAX: 423a676f752e5f00 RBX: 1ffff92000000ef0 RCX: 423a676f752e5f00
RDX: dffffc0000000000 RSI: ffffffff8a8c0620 RDI: ffffffff8adf0020
RBP: ffffc90000007828 R08: ffffffff90ad82cf R09: 1ffffffff215b059
R10: dffffc0000000000 R11: fffffbfff215b05a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 __ip_queue_xmit+0x1174/0x1c10 net/ipv4/ip_output.c:539
 __tcp_transmit_skb+0x1c92/0x31a0 net/ipv4/tcp_output.c:1405
 tcp_delack_timer_handler+0x2a9/0x440 net/ipv4/tcp_timer.c:322
 tcp_delack_timer+0x188/0x2e0 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+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:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 d4 12 5e f7 e8 4f 11 5e f7 fb 65 48 8b 05 36 c5 d7 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 91 74 44 f7 48
RSP: 0018:ffffc90003287f08 EFLAGS: 00000286
RAX: ffff888057d41dc0 RBX: 0000000000000029 RCX: 423a676f752e5f00
RDX: dffffc0000000000 RSI: ffffffff8a8c0620 RDI: ffffffff8adf0020
RBP: ffffc90003287f48 R08: ffff8880b8e3580b R09: 1ffff110171c6b01
R10: dffffc0000000000 R11: ffffed10171c6b02 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003287f58 R15: 0000000000000000
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc1d319acb9
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:00007ffc9c0c01b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fc1d3415fa0 RCX: 00007fc1d319acb9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000010
RBP: 00007fc1d3208bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1d3415fac R14: 00007fc1d3415fa0 R15: 00007fc1d3415fa0
 </TASK>