rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2689 jiffies s: 49621 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: 11568 Comm: syz.5.1711 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:preempt_count_add+0x5d/0x190 kernel/sched/core.c:5713
Code: e1 b8 aa 7e 65 01 3d da b8 aa 7e 48 c7 c0 40 91 be 96 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e6 00 00 00 83 3d b3 da 66 15 00 <75> 11 65 8b 05 b2 b8 aa 7e 0f b6 c0 3d f5 00 00 00 73 58 65 8b 05
RSP: 0018:ffffc900001dfa28 EFLAGS: 00000046
RAX: 0000000000000004 RBX: ffffc900001dfb80 RCX: ffffffff96be9103
RDX: 0000000000000022 RSI: 000000000000007f RDI: 0000000000000001
RBP: ffffc900001dfbc8 R08: ffffc90005abf7f0 R09: ffffc900001dfbd0
R10: fffff5200003bf7c R11: 1ffff9200003bf7a R12: ffffffff8a21ea16
R13: ffffc90005abf800 R14: dffffc0000000000 R15: dffffc0000000000
FS:  00007f5aded8e6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000005eef9000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 unwind_next_frame+0xaf/0x20b0 arch/x86/kernel/unwind_orc.c:433
 perf_callchain_kernel+0x461/0x5c0 arch/x86/events/core.c:2805
 get_perf_callchain+0x376/0x480 kernel/events/callchain.c:200
 perf_callchain kernel/events/core.c:7512 [inline]
 perf_prepare_sample+0x399/0x2040 kernel/events/core.c:7545
 __perf_event_output kernel/events/core.c:7730 [inline]
 perf_event_output_forward+0x163/0x2a0 kernel/events/core.c:7750
 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496
 perf_tp_event+0x335/0xb60 kernel/events/core.c:10029
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10002
 perf_trace_preemptirq_template+0x287/0x330 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:on_stack arch/x86/include/asm/stacktrace.h:-1 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:347 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline]
RIP: 0010:unwind_next_frame+0x9aa/0x20b0 arch/x86/kernel/unwind_orc.c:539
Code: 70 4c 89 64 24 20 4c 8d 73 08 4d 89 f4 49 c1 ec 03 43 80 3c 2c 00 74 08 4c 89 f7 e8 10 97 98 00 4c 89 74 24 60 4c 89 7c 24 40 <48> 89 6c 24 30 4c 8b 73 08 4c 8d 7b 10 4d 89 fd 49 c1 ed 03 48 b8
RSP: 0018:ffffc900001e0470 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900001e0548 RCX: 1ffff9200003c001
RDX: ffffc90005abf2e8 RSI: ffffffff8e94c538 RDI: ffffc900001e0ff8
RBP: ffffffff8f3763b6 R08: 000000000000000e R09: 000000000000000e
R10: fffff5200003c0b5 R11: 1ffff9200003c0b3 R12: 1ffff9200003c0aa
R13: dffffc0000000000 R14: ffffc900001e0550 R15: 1ffffffff1e6ec76
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328
 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]
 kmem_cache_alloc_node+0x14d/0x320 mm/slub.c:3404
 __alloc_skb+0xfc/0x7e0 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1271 [inline]
 ndisc_alloc_skb+0xa6/0x450 net/ipv6/ndisc.c:423
 ndisc_send_rs+0x2a2/0x610 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3979
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x529/0x7d0 kernel/time/timer.c:2022
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2035
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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:5123
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 e0 6d c9 08 e8 6b b7 2e 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:ffffc90005abf398 EFLAGS: 00000282
RAX: e348043123060c00 RBX: 0000000000000000 RCX: e348043123060c00
RDX: dffffc0000000000 RSI: ffffffff8a8c0580 RDI: ffffffff8adef760
RBP: ffffc90005abf3f0 R08: dffffc0000000000 R09: ffffed10171e6afa
R10: ffffed10171e6afa R11: 1ffff110171e6af9 R12: ffff88802b628000
R13: dffffc0000000000 R14: ffff888017749dc0 R15: ffff8880b8f3b590
 context_switch kernel/sched/core.c:5247 [inline]
 __schedule+0x10f4/0x40b0 kernel/sched/core.c:6561
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
 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:instrument_atomic_read include/linux/instrumented.h:72 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline]
RIP: 0010:need_resched include/linux/sched.h:2230 [inline]
RIP: 0010:preempt_schedule_common+0xa0/0xd0 kernel/sched/core.c:6738
Code: 89 1e bf 01 00 00 00 e8 ee bb ff ff 65 8b 05 1f fd e1 75 65 ff 0d 18 fd e1 75 65 48 8b 1d 08 fd e1 75 48 89 df be 08 00 00 00 <e8> ab 94 b0 f7 48 89 d8 48 c1 e8 03 42 80 3c 38 00 0f 84 5a ff ff
RSP: 0018:ffffc90005abf700 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88802b628000 RCX: ffffffff81587bca
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88802b628000
RBP: ffffc90005abf798 R08: dffffc0000000000 R09: ffffed100357e1f3
R10: ffffed100357e1f3 R11: 1ffff1100357e1f2 R12: dffffc0000000000
R13: ffffffff8cb30200 R14: ffff88802b6294d8 R15: dffffc0000000000
 preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754
 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+0xf6/0x100 kernel/locking/spinlock.c:194
 rcu_report_exp_rnp kernel/rcu/tree_exp.h:224 [inline]
 rcu_preempt_deferred_qs_irqrestore+0x853/0xc00 kernel/rcu/tree_plugin.h:567
 rcu_read_unlock_special+0x419/0x500 kernel/rcu/tree_plugin.h:684
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 cgroup_freezing+0x287/0x340 kernel/cgroup/legacy_freezer.c:72
 freezing_slow_path+0xb7/0x150 kernel/freezer.c:46
 freezing include/linux/freezer.h:37 [inline]
 try_to_freeze include/linux/freezer.h:54 [inline]
 get_signal+0x12ba/0x1350 kernel/signal.c:2661
 arch_do_signal_or_restart+0xb7/0x1240 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 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:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5addf8f749
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:00007f5aded8e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5ade1e5fa8 RCX: 00007f5addf8f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5ade1e5fa8
RBP: 00007f5ade1e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5ade1e6038 R14: 00007fff54fadc10 R15: 00007fff54fadcf8
 </TASK>