watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.4.427:7215] Modules linked in: irq event stamp: 27296095 hardirqs last enabled at (27296094): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (27296095): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (26762210): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (26762210): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (26762210): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (26762213): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (26762213): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (26762213): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 7215 Comm: syz.4.427 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:perf_tp_event+0x4c/0x1380 kernel/events/core.c:11056 Code: 24 08 41 89 cc 49 89 d5 48 89 74 24 10 89 3c 24 65 48 8b 05 c6 a0 8b 10 48 89 84 24 00 02 00 00 49 bf 00 00 00 00 00 fc ff df <4c> 8d b4 24 80 00 00 00 48 c7 44 24 40 b3 8a b5 41 48 c7 44 24 48 RSP: 0018:ffffc900000073c0 EFLAGS: 00000286 RAX: 69f0a66bba61e300 RBX: ffffe8ffffc3e0a8 RCX: 000000000000002c RDX: ffffe8ffffcb8000 RSI: 0000000000000001 RDI: 00000000000000ec RBP: ffffc90000007628 R08: ffff8880b8633198 R09: ffffe8ffffc3e0a8 R10: dffffc0000000000 R11: fffff91ffff97005 R12: 000000000000002c R13: ffffe8ffffcb8000 R14: ffff8880b8633198 R15: dffffc0000000000 FS: 00007fc7da2ce6c0(0000) GS:ffff888125e32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeb3396e8c CR3: 0000000076b94000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11005 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x389/0x3b0 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 ref_tracker_free+0xef/0x7d0 lib/ref_tracker.c:307 netdev_tracker_free include/linux/netdevice.h:4420 [inline] netdev_put include/linux/netdevice.h:4437 [inline] dst_destroy+0x10f/0x350 net/core/dst.c:114 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xd70/0x1870 kernel/rcu/tree.c:2857 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:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7190 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 8b c6 33 f6 e8 26 44 6c f6 fb bf 01 00 00 00 1b a8 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90003667740 EFLAGS: 00000286 RAX: 69f0a66bba61e300 RBX: 0000000000000000 RCX: 69f0a66bba61e300 RDX: 0000000000000007 RSI: ffffffff8d792e98 RDI: 0000000000000001 RBP: ffffc900036677e0 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006ccee8 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:arch_try_cmpxchg128 arch/x86/include/asm/cmpxchg_64.h:83 [inline] RIP: 0010:__update_freelist_fast mm/slub.c:767 [inline] RIP: 0010:slab_update_freelist+0x54/0x100 mm/slub.c:832 Code: 8f 04 24 4c 8b 24 24 fa 41 f7 c4 00 02 00 00 75 36 48 89 f7 4c 89 f6 48 89 ca e8 e7 fe ff ff 89 c3 eb 44 48 8b 19 48 8b 49 08 <49> 8b 06 49 8b 56 08 f0 48 0f c7 4e 20 48 89 c1 b0 01 74 4e 49 89 RSP: 0018:ffffc900036678f8 EFLAGS: 00000202 RAX: 69f0a66bba61e300 RBX: ffff88803267e000 RCX: 0000000000040003 RDX: ffffc90003667960 RSI: ffffea0000c99e00 RDI: ffff88813ffb0500 RBP: ffffc900036679b0 R08: 0000000000000001 R09: ffffffff822876bc R10: dffffc0000000000 R11: fffffbfff1f0448f R12: 0000000000000001 R13: ffff88803267e000 R14: ffffc90003667960 R15: 0000000000040004 __slab_free+0x104/0x2a0 mm/slub.c:5937 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x37c/0x700 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] bpf_prog_alloc_no_stats+0xdb/0x500 kernel/bpf/core.c:110 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:155 bpf_prog_load+0x735/0x1a10 kernel/bpf/syscall.c:2990 __sys_bpf+0x5c3/0x8a0 kernel/bpf/syscall.c:6205 __do_sys_bpf kernel/bpf/syscall.c:6318 [inline] __se_sys_bpf kernel/bpf/syscall.c:6316 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6316 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: 0033:0x7fc7d938f749 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:00007fc7da2ce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc7d95e5fa0 RCX: 00007fc7d938f749 RDX: 0000000000000094 RSI: 00002000000013c0 RDI: 0000000000000005 RBP: 00007fc7d9413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc7d95e6038 R14: 00007fc7d95e5fa0 R15: 00007ffda6231558 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6184 Comm: kworker/u8:15 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+0xccf/0x12b0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 4a 9a 0b 00 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 RSP: 0000:ffffc9000524f620 EFLAGS: 00000293 RAX: ffffffff81b61c57 RBX: 1ffff110170c856d RCX: ffff8880310bbd00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000524f7a0 R08: ffffffff8f822477 R09: 1ffffffff1f0448e R10: dffffc0000000000 R11: fffffbfff1f0448f R12: ffff8880b8642b68 R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125f32000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2a96537080 CR3: 000000000dd3a000 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: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_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:874 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