watchdog: BUG: soft lockup - CPU#0 stuck for 128s! [syz.2.25:6044] Modules linked in: irq event stamp: 20294867 hardirqs last enabled at (20294866): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (20294867): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (20210300): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (20210300): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (20210300): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (20210303): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (20210303): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (20210303): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 6044 Comm: syz.2.25 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__alloc_skb+0x25e/0x430 net/core/skbuff.c:-1 Code: 24 10 eb 2e e8 f3 60 90 f8 4d 89 e5 4c 8b 64 24 10 44 89 f6 83 e6 fe 4c 89 e7 89 da e8 eb 48 eb f8 48 85 c0 0f 84 45 01 00 00 <49> 89 c7 e8 ca 60 90 f8 41 0f 0d 0f 48 8d 7c 24 1c 48 8d 4c 24 1b RSP: 0018:ffffc90000007880 EFLAGS: 00000282 RAX: ffff88805bce6c80 RBX: 00000000ffffffff RCX: 8f8da6283d928100 RDX: ffff88801da81a00 RSI: ffffffff8bc08340 RDI: ffffffff8bc08300 RBP: ffffc90000007930 R08: 00000000ffffffff R09: 0000000000000000 R10: ffff88805bce6c80 R11: fffff52000000e03 R12: ffff88801da81a00 R13: dffffc0000000000 R14: 0000000000020820 R15: 0000000000000000 FS: 00007f44d41926c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d01f843908 CR3: 0000000076a84000 CR4: 00000000003526f0 Call Trace: __netdev_alloc_skb+0x108/0x960 net/core/skbuff.c:754 netdev_alloc_skb include/linux/skbuff.h:3484 [inline] dev_alloc_skb include/linux/skbuff.h:3497 [inline] __ieee80211_beacon_get+0xc06/0x1880 net/mac80211/tx.c:5654 ieee80211_beacon_get_tim+0xb4/0x2b0 net/mac80211/tx.c:5776 ieee80211_beacon_get include/net/mac80211.h:5669 [inline] mac80211_hwsim_beacon_tx+0x3c5/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2361 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 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:check_preemption_disabled+0x35/0x120 lib/smp_processor_id.c:53 Code: 48 8b 05 be e1 22 07 48 89 44 24 08 65 8b 05 c6 e1 22 07 65 8b 0d bb e1 22 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 9b e1 22 07 <48> 3b 4c 24 08 0f 85 cc 00 00 00 48 83 c4 10 5b 41 5e 41 5f 5d e9 RSP: 0018:ffffc900051eee58 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff81743f85 RCX: 8f8da6283d928100 RDX: ffffc9000cb12000 RSI: ffffffff8bc08340 RDI: ffffffff8bc08300 RBP: dffffc0000000000 R08: ffffc900051eeb57 R09: 0000000000000000 R10: ffffc900051eeb48 R11: fffff52000a3dd6b R12: ffffc900051efee0 R13: ffffffff81743f85 R14: ffffffff8df41a20 R15: ffffffff8df41a20 rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:751 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x4b/0x3b0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:memset_orig+0x3a/0xb0 arch/x86/lib/memset_64.S:71 Code: 01 48 0f af c1 41 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84 00 00 00 00 00 48 ff c9 48 89 07 48 89 47 08 <48> 89 47 10 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 RSP: 0018:ffffc900051ef8a8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 000000000000adc0 RCX: 0000000000000004 RDX: 0000000000000200 RSI: 0000000000000000 RDI: ffffc900051ef970 RBP: ffffc900051efad8 R08: dffffc0000000000 R09: 0000000000000000 R10: ffffc900051ef8b0 R11: fffff52000a3deeb R12: 00000000000ddc00 R13: 0000000000000020 R14: ffff888077d27a20 R15: ffffc900051ef8b0 kasan_save_stack mm/kasan/common.c:53 [inline] kasan_save_track+0x2f/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5776 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:271 __netns_tracker_alloc include/net/net_namespace.h:362 [inline] netns_tracker_alloc include/net/net_namespace.h:371 [inline] get_net_track+0x16e/0x230 include/net/net_namespace.h:388 sk_alloc+0x1d6/0x390 net/core/sock.c:2318 __netlink_create+0x65/0x260 net/netlink/af_netlink.c:626 netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:684 __sock_create+0x4b3/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f44d338f749 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:00007f44d4192038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f44d35e5fa0 RCX: 00007f44d338f749 RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f44d3413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f44d35e6038 R14: 00007f44d35e5fa0 R15: 00007ffca79f0f38 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 154 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce0/0x12b0 kernel/smp.c:877 Code: 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f5 95 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 d9 95 0b 00 eb e4 44 89 e1 80 e1 07 80 c1 03 38 c1 7c e2 RSP: 0000:ffffc90002fa7620 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 1ffff110170c856d RCX: ffff88801db39e80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90002fa77a0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: ffff8880b8642b68 R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f39fc568160 CR3: 000000000dd3a000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2711 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2921 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:879 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246