rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2677 jiffies s: 14785 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: 6905 Comm: syz.3.713 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:215
Code: 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d d0 80 9d 0c 48 89 de 5b e9 b7 42 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 <65> 48 8b 0d e4 f9 7f 7e 65 8b 15 e5 f9 7f 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000006cf8 EFLAGS: 00000002
RAX: ffffffff81a51cc7 RBX: 1ffff92000000da4 RCX: 603ed7e04f327200
RDX: ffff88802f6f1dc0 RSI: ffffffff8adf1300 RDI: ffffffff8adf12c0
RBP: ffffc90000006e10 R08: dffffc0000000000 R09: 1ffffffff215f248
R10: dffffc0000000000 R11: fffffbfff215f249 R12: ffffc90000007040
R13: ffffc90000006da0 R14: 0000000000000001 R15: ffff88807a9b5400
FS:  00007f588f28d6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a065456b8 CR3: 0000000056a17000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 rcu_read_lock include/linux/rcupdate.h:792 [inline]
 __perf_event_output kernel/events/core.c:7728 [inline]
 perf_event_output_forward+0x107/0x2f0 kernel/events/core.c:7750
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_swevent_overflow+0x19b/0x230 kernel/events/core.c:9579
 perf_swevent_event+0x458/0x570 kernel/events/core.c:-1
 perf_tp_event+0x3e7/0xc30 kernel/events/core.c:10064
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10032
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish+0x13f/0x180 kernel/trace/trace_preemptirq.c:67
 irqentry_enter+0x33/0x50 kernel/entry/common.c:382
 sysvec_irq_work+0xa/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:unwind_next_frame+0x981/0x20b0 arch/x86/kernel/unwind_orc.c:-1
Code: 11 00 00 4d 89 f7 49 c1 ef 03 43 0f b6 04 2f 84 c0 0f 85 7d 11 00 00 0f b6 45 01 83 e0 03 ff 24 c5 10 80 89 8a 4c 89 74 24 70 <4c> 89 64 24 20 4c 8d 73 08 4d 89 f4 49 c1 ec 03 43 80 3c 2c 00 74
RSP: 0018:ffffc90000007490 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000007568 RCX: ffffffff8e2fafcc
RDX: ffffc90000007ff8 RSI: ffffffff8e2fafb4 RDI: 0000000000000001
RBP: ffffffff8e9f6e4e R08: 0000000000000009 R09: 0000000000000010
R10: dffffc0000000000 R11: fffff52000000eb9 R12: ffffffff8e9f6e4a
R13: dffffc0000000000 R14: ffffffff8e9f6e4f R15: 1ffffffff1d3edc9
 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_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
 skb_free_head net/core/skbuff.c:762 [inline]
 skb_release_data+0x5db/0x7c0 net/core/skbuff.c:791
 skb_release_all net/core/skbuff.c:856 [inline]
 __kfree_skb+0x4c/0x60 net/core/skbuff.c:870
 tcp_write_queue_purge+0x13f/0x2f0 net/ipv4/tcp.c:3123
 tcp_done_with_error+0x3f/0xc0 net/ipv4/tcp_input.c:4408
 tcp_write_err net/ipv4/tcp_timer.c:70 [inline]
 tcp_write_timeout net/ipv4/tcp_timer.c:273 [inline]
 tcp_retransmit_timer+0x1270/0x2790 net/ipv4/tcp_timer.c:547
 tcp_write_timer+0x126/0x280 net/ipv4/tcp_timer.c:676
 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_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:finish_task_switch+0x26a/0x8f0 kernel/sched/core.c:5124
Code: 0f 84 3b 01 00 00 48 85 db 0f 85 5a 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 b0 4c de 08 e8 4b 2d 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900051578b8 EFLAGS: 00000286
RAX: 603ed7e04f327200 RBX: 0000000000000000 RCX: 603ed7e04f327200
RDX: dffffc0000000000 RSI: ffffffff8a8c1120 RDI: ffffffff8adf1320
RBP: ffffc90005157910 R08: ffffffff90af927f R09: 1ffffffff215f24f
R10: dffffc0000000000 R11: fffffbfff215f250 R12: ffff88802f6f1dc0
R13: dffffc0000000000 R14: ffff888040e51dc0 R15: ffff8880b8e3b5d0
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x11d9/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6874
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:perf_trace_init+0x9e/0x2d0 kernel/trace/trace_event_perf.c:223
Code: 00 27 b8 8c 0f 84 75 01 00 00 4c 89 24 24 4c 8d 63 40 4c 89 e0 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 17 01 00 00 4d 63 24 24 <4c> 89 ff 4c 89 e6 e8 67 00 f8 ff 4d 39 e7 0f 85 a9 00 00 00 4c 8d
RSP: 0018:ffffc90005157c20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8cc02120 RCX: ffff88802f6f1dc0
RDX: 0000000000000000 RSI: 0000000000000195 RDI: 000000000000011c
RBP: 0000000000000002 R08: ffffffff8e1ff3ef R09: 1ffffffff1c3fe7d
R10: dffffc0000000000 R11: fffffbfff1c3fe7e R12: 0000000000000194
R13: 0000000000000000 R14: dffffc0000000000 R15: 000000000000011c
 perf_tp_event_init+0x89/0x110 kernel/events/core.c:10119
 perf_try_init_event+0x12b/0x3d0 kernel/events/core.c:11634
 perf_init_event kernel/events/core.c:11698 [inline]
 perf_event_alloc+0xf5c/0x21b0 kernel/events/core.c:11990
 __do_sys_perf_event_open kernel/events/core.c:12526 [inline]
 __se_sys_perf_event_open+0x6fd/0x1ec0 kernel/events/core.c:12418
 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: 0033:0x7f588e39cdd9
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:00007f588f28d028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f588e616090 RCX: 00007f588e39cdd9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f588e432d69 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f588e616128 R14: 00007f588e616090 R15: 00007ffe70fc4588
 </TASK>