watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.0.2602:19500] Modules linked in: irq event stamp: 7240021 hardirqs last enabled at (7240020): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (7240021): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (6830874): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (6830874): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (6830874): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (6830883): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (6830883): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (6830883): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 19500 Comm: syz.0.2602 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__do_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0x28a/0x2e0 kernel/locking/lockdep.c:5831 Code: c7 00 ee 7b 8e be 04 00 00 00 e8 c1 aa 08 00 48 8b 1d 7a 70 da 0c 65 48 ff 03 48 8b 05 b7 35 5a 0e 48 85 c0 74 22 48 8b 78 08 <4c> 89 ee 8b 54 24 04 89 e9 45 89 e0 45 89 f9 ff 74 24 70 41 56 e8 RSP: 0018:ffffc90000a08160 EFLAGS: 00000282 RAX: ffff888059050f10 RBX: ffffffff931c2150 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8e62c240 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000a082f8 R11: ffffffff81b0b0d0 R12: 0000000000000002 R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f56976886c0(0000) GS:ffff888125567000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000032626000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 refdst_drop include/net/dst.h:272 [inline] skb_dst_drop include/net/dst.h:284 [inline] __dev_queue_xmit+0x482/0x38a0 net/core/dev.c:4791 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:246 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4041 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:perf_trace_buf_alloc+0x187/0x280 kernel/trace/trace_event_perf.c:416 Code: 33 60 00 4d 8b 36 e8 28 b4 dd 09 89 c5 41 89 c7 bf 08 00 00 00 89 c6 e8 37 17 f6 ff 83 fd 07 0f 87 a8 00 00 00 e8 e9 12 f6 ff <4e> 8d 3c fd 90 a7 1a 8e 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 RSP: 0018:ffffc9000511efc0 EFLAGS: 00000293 RAX: ffffffff81cf7897 RBX: 000000000000002c RCX: ffff88802db5dac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 0000000000000001 R08: 0000000000000002 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffffff81b0b0d0 R12: ffffffff8e1aa798 R13: dffffc0000000000 R14: 0000607eda877000 R15: 0000000000000001 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x1a5/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x158d/0x5340 kernel/sched/core.c:6907 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7234 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:mod_memcg_state+0x0/0x310 mm/memcontrol.c:700 Code: 07 38 c1 7c ea 48 89 df e8 cd cb f7 ff eb e0 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 55 41 57 41 56 41 55 41 54 53 50 89 d5 89 f3 49 89 fe RSP: 0018:ffffc9000511f9a0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880797f4240 RCX: 25ad880c4ca43400 RDX: 0000000000000001 RSI: 0000000000000037 RDI: ffff8880797f4240 RBP: 0000000000000000 R08: ffffffff8238fd8a R09: ffff8880b873c1c0 R10: ffffc9000511f3c8 R11: fffff52000a23e7b R12: 0000000000000005 R13: ffff8880b873c2f0 R14: 0000000000000001 R15: 0000000000000180 account_kmem_nmi_safe mm/memcontrol.c:2817 [inline] obj_cgroup_charge_pages+0x34/0xa0 mm/memcontrol.c:2861 obj_cgroup_charge_account+0xcf/0x650 mm/memcontrol.c:3160 __memcg_slab_post_alloc_hook+0x5f8/0xa80 mm/memcontrol.c:3249 memcg_slab_post_alloc_hook mm/slub.c:2459 [inline] slab_post_alloc_hook mm/slub.c:4512 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_lru_noprof+0x346/0x640 mm/slub.c:4849 __d_alloc+0x37/0x6f0 fs/dcache.c:1740 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1871 alloc_path_pseudo fs/file_table.c:364 [inline] alloc_file_pseudo+0xdd/0x240 fs/file_table.c:380 __anon_inode_getfile fs/anon_inodes.c:166 [inline] anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:204 __do_sys_perf_event_open kernel/events/core.c:14065 [inline] __se_sys_perf_event_open+0xf05/0x1d60 kernel/events/core.c:13767 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f569679c799 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:00007f5697688028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f5696a15fa0 RCX: 00007f569679c799 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007f5696832bd9 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5696a16038 R14: 00007f5696a15fa0 R15: 00007ffd47ee7828 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6841 Comm: kworker/u8:13 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 74 e2 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 1f de 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 03 de RSP: 0018:ffffc90002fb7720 EFLAGS: 00000293 RAX: ffffffff81b9ad7d RBX: 1ffff110170e812d RCX: ffff8880323fdac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002fb7860 R08: ffffffff90117db7 R09: 1ffffffff2022fb6 R10: dffffc0000000000 R11: fffffbfff2022fb7 R12: ffff8880b8740968 R13: dffffc0000000000 R14: ffff8880b863bf80 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125467000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd753c16038 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:899 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245