watchdog: BUG: soft lockup - CPU#0 stuck for 141s! [syz.0.158:6460] Modules linked in: irq event stamp: 14438247 hardirqs last enabled at (14438246): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (14438247): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (93628): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (93628): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (93628): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (93631): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (93631): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (93631): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6460 Comm: syz.0.158 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:kasan_check_byte include/linux/kasan.h:399 [inline] RIP: 0010:lock_acquire+0x85/0x360 kernel/locking/lockdep.c:5842 Code: 61 02 09 00 84 c0 75 0d f6 05 54 29 f0 0d 01 0f 84 d7 01 00 00 83 3d b9 75 06 0e 00 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 <4c> 89 ef e8 53 46 86 00 83 3d 9c 75 06 0e 00 0f 84 fa 00 00 00 65 RSP: 0018:ffffc900000072d8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: d9228a882cca3700 RDX: 0000000000000000 RSI: ffffffff8172d1b2 RDI: ffffffff8be34420 RBP: ffffffff8172d195 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000006f88 R11: ffffffff81ac4d00 R12: 0000000000000002 R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f054f6596c0(0000) GS:ffff888125c12000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33012ff8 CR3: 0000000074f54000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4407 kmalloc_noprof include/linux/slab.h:905 [inline] dst_cow_metrics_generic+0x56/0x1c0 net/core/dst.c:193 dst_metrics_write_ptr include/net/dst.h:133 [inline] dst_metric_set include/net/dst.h:194 [inline] icmp6_dst_alloc+0x264/0x420 net/ipv6/route.c:3337 ndisc_send_skb+0x41f/0x1440 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7288 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 ab ea 13 f6 e8 76 47 4b f6 fb bf 01 00 00 00 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90006037140 EFLAGS: 00000286 RAX: d9228a882cca3700 RBX: 0000000000000000 RCX: d9228a882cca3700 RDX: 0000000000000000 RSI: ffffffff8d9bad9d RDI: 0000000000000001 RBP: ffffc900060371f0 R08: ffffffff8fa3b437 R09: 1ffffffff1f47686 R10: dffffc0000000000 R11: fffffbfff1f47687 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000c06e28 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 7b 6f 03 11 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc900060372b8 EFLAGS: 00000206 RAX: d9228a882cca3700 RBX: 0000000000000000 RCX: d9228a882cca3700 RDX: 0000000000000001 RSI: ffffffff8dbaa451 RDI: ffffffff8be34480 RBP: ffffffff8172d195 R08: 0000000000000000 R09: ffffffff8172d195 R10: dffffc0000000000 R11: ffffffff81ac4d00 R12: 0000000000000002 R13: ffffffff8e13a120 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_node_noprof+0x234/0x3d0 mm/slub.c:4419 kmalloc_node_noprof include/linux/slab.h:928 [inline] __get_vm_area_node+0x13f/0x300 mm/vmalloc.c:3176 __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3853 __vmalloc_node_noprof mm/vmalloc.c:3956 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3970 bpf_prog_alloc_no_stats+0x4a/0x4d0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:153 bpf_prog_load+0x735/0x19e0 kernel/bpf/syscall.c:2964 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6132 __do_sys_bpf kernel/bpf/syscall.c:6242 [inline] __se_sys_bpf kernel/bpf/syscall.c:6240 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6240 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f054e78eec9 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:00007f054f659038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f054e9e5fa0 RCX: 00007f054e78eec9 RDX: 0000000000000094 RSI: 0000200000000180 RDI: 0000000000000005 RBP: 00007f054e811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f054e9e6038 R14: 00007f054e9e5fa0 R15: 00007fff77183578 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6061 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 b6 63 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 5f 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 45 5f RSP: 0018:ffffc90004b2f660 EFLAGS: 00000293 RAX: ffffffff81b4621b RBX: 1ffff110170c8341 RCX: ffff88802c81bc00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004b2f7e0 R08: ffffffff8fa3b437 R09: 1ffffffff1f47686 R10: dffffc0000000000 R11: fffffbfff1f47687 R12: ffff8880b8641a08 R13: dffffc0000000000 R14: ffff8880b873b1c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d12000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556b12f5c8 CR3: 000000000df36000 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:1044 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2653 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245