rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2683 jiffies s: 2345 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: 4524 Comm: syz.3.41 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 2e 0f 1f 84 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d 70 77 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 84 e8 7f 7e 65 8b 15 85 e8 7f 7e 81 e2 00
RSP: 0018:ffffc90000007138 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffc900000072e0 RCX: ffff88807a989dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007230 R08: ffffc900000072b7 R09: ffffc90000007280
R10: dffffc0000000000 R11: fffff52000000e57 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc90000007580
FS:  00007f55660736c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fba795456b8 CR3: 00000000247bd000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 perf_prepare_sample+0x9bd/0x2020 kernel/events/core.c:7593
 __perf_event_output kernel/events/core.c:7730 [inline]
 perf_event_output_forward+0x197/0x2f0 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_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 82 22 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:ffffc900000079c0 EFLAGS: 00000206
RAX: ab0d3cdc8af36500 RBX: 1ffff92000000f40 RCX: ab0d3cdc8af36500
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1ba0
RBP: ffffc90000007ac0 R08: ffffffff90afa2ef R09: 1ffffffff215f45d
R10: dffffc0000000000 R11: fffffbfff215f45e 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]
 process_backlog+0x410/0x6f0 net/core/dev.c:6062
 __napi_poll+0xc0/0x460 net/core/dev.c:6628
 napi_poll net/core/dev.c:6695 [inline]
 net_rx_action+0x5dd/0xb20 net/core/dev.c:6809
 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: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 60 5b de 08 e8 5b 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:ffffc900054c7258 EFLAGS: 00000282
RAX: ab0d3cdc8af36500 RBX: 0000000000000000 RCX: ab0d3cdc8af36500
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1ba0
RBP: ffffc900054c72b0 R08: ffffffff90afa2ef R09: 1ffffffff215f45d
R10: dffffc0000000000 R11: fffffbfff215f45e R12: ffff88807a989dc0
R13: dffffc0000000000 R14: ffff88807e539dc0 R15: ffff8880b8e3b5d0
 context_switch kernel/sched/core.c:5248 [inline]
 __schedule+0x11d9/0x40e0 kernel/sched/core.c:6562
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6731
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6755
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x10d/0x120 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __unfreeze_partials+0x161/0x200 mm/slub.c:2584
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
 anon_vma_alloc mm/rmap.c:93 [inline]
 anon_vma_fork+0xda/0x4f0 mm/rmap.c:359
 dup_mmap kernel/fork.c:668 [inline]
 dup_mm kernel/fork.c:1546 [inline]
 copy_mm+0xc32/0x1690 kernel/fork.c:1595
 copy_process+0x1979/0x4030 kernel/fork.c:2356
 kernel_clone+0x24b/0x900 kernel/fork.c:2762
 __do_sys_clone kernel/fork.c:2903 [inline]
 __se_sys_clone kernel/fork.c:2887 [inline]
 __x64_sys_clone+0x1a7/0x220 kernel/fork.c:2887
 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: 0033:0x7f556519ce59
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:00007f5566072fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f5565415fa0 RCX: 00007f556519ce59
RDX: 0000200000000400 RSI: 00002000000003f0 RDI: 0000000028000000
RBP: 00007f5565232d6f R08: 0000200000000680 R09: 0000200000000680
R10: 0000200000000440 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f5565416038 R14: 00007f5565415fa0 R15: 00007ffebaffdfb8
 </TASK>