watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.4.6401:530] Modules linked in: irq event stamp: 6773049 hardirqs last enabled at (6773048): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (6773049): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (5011106): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (5011106): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (5011106): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (5011109): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (5011109): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (5011109): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 530 Comm: syz.4.6401 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:in_exception_stack arch/x86/kernel/dumpstack_64.c:108 [inline] RIP: 0010:get_stack_info_noinstr+0x4d/0x130 arch/x86/kernel/dumpstack_64.c:179 Code: 00 00 65 48 8b 05 fb c2 6e 07 49 39 c4 74 07 31 db e9 bb 00 00 00 48 c7 c7 52 62 f5 8d e8 9b 50 00 00 65 4c 8b 2d db 03 6f 07 <4d> 85 ed 74 66 4d 39 fd 0f 97 c0 49 8d 8d 00 f0 01 00 4c 39 f9 0f RSP: 0018:ffffc90000006aa8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffc90000006b01 RCX: 0000000000000302 RDX: ffffc90000006b68 RSI: ffffffff8df56252 RDI: ffffffff8c27a480 RBP: ffffc90000006b01 R08: ffffc90000006b00 R09: 0000000000000000 R10: ffffc90000006b68 R11: fffff52000000d79 R12: ffff888064de1e40 R13: fffffe0000008000 R14: ffffc90000006b68 R15: ffffc90000006b08 FS: 000055557ea80500(0000) GS:ffff888125466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb0795e9078 CR3: 00000000551c0000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: get_stack_info+0x3a/0xf0 arch/x86/kernel/dumpstack_64.c:199 __unwind_start+0x43e/0x760 arch/x86/kernel/unwind_orc.c:742 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5219 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5231 kmalloc_noprof include/linux/slab.h:966 [inline] kzalloc_noprof include/linux/slab.h:1204 [inline] ieee802_11_parse_elems_full+0x159/0x2ab0 net/mac80211/parse.c:1051 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2480 [inline] ieee80211_inform_bss+0x161/0x1160 net/mac80211/scan.c:79 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd08/0x1b70 net/wireless/scan.c:2373 cfg80211_inform_bss_data+0x266/0x3c40 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x760 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364 __ieee80211_rx_handle_packet net/mac80211/rx.c:5305 [inline] ieee80211_rx_list+0x29e5/0x3710 net/mac80211/rx.c:5588 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5611 ieee80211_rx include/net/mac80211.h:5267 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 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:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:tracing_generic_entry_update include/linux/trace_events.h:179 [inline] RIP: 0010:perf_trace_buf_update+0x5a/0x190 kernel/trace/trace_event_perf.c:429 Code: 31 ff e8 09 16 f6 ff 44 89 f7 e8 11 4d fa ff 4c 8d 73 03 4c 89 f1 48 c1 e9 03 42 0f b6 0c 39 84 c9 0f 85 87 00 00 00 41 88 06 <65> 4c 8b 35 76 24 4c 11 49 81 c6 f8 05 00 00 4c 89 f1 48 c1 e9 03 RSP: 0018:ffffc90004e4f050 EFLAGS: 00000246 RAX: 0000000000240001 RBX: ffffe8ffff624000 RCX: 0000000000000000 RDX: ffff888064de1e40 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 00000000000000eb R08: ffffc90004e4f28f R09: 0000000000000000 R10: ffffc90004e4f280 R11: fffff520009c9e52 R12: ffffe8ffff624000 R13: dffffc0000000000 R14: ffffe8ffff624003 R15: dffffc0000000000 perf_tp_event+0x157/0x29b0 kernel/events/core.c:11368 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11306 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x345/0x440 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 __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2687 [inline] slab_free mm/slub.c:6124 [inline] kfree+0x1c1/0x630 mm/slub.c:6442 ref_tracker_free+0x522/0x840 lib/ref_tracker.c:340 __netns_tracker_free include/net/net_namespace.h:384 [inline] put_net_track include/net/net_namespace.h:399 [inline] __sk_destruct+0x3c7/0x880 net/core/sock.c:2379 sock_put include/net/sock.h:2007 [inline] packet_release+0xb9b/0xcc0 net/packet/af_packet.c:3181 __sock_release net/socket.c:662 [inline] sock_close+0xc3/0x240 net/socket.c:1455 __fput+0x44f/0xa70 fs/file_table.c:469 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7fc619c629 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:00007fff28b44348 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fff28b44430 RCX: 00007f7fc619c629 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000012113a R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2d020000 R11: 0000000000000246 R12: 00007fff28b44470 R13: 00007f7fc6415fac R14: 0000000000121b69 R15: 00007f7fc6415fa0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7307 Comm: kworker/u8:11 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 24 e3 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cf 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 b3 de RSP: 0018:ffffc90005d9f720 EFLAGS: 00000293 RAX: ffffffff81b9addd RBX: 1ffff110170c8515 RCX: ffff888030f85ac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90005d9f860 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff8880b86428a8 R13: dffffc0000000000 R14: ffff8880b873bf80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125566000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc2dd816038 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 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