watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.4.1427:11959] Modules linked in: irq event stamp: 9619397 hardirqs last enabled at (9619396): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (9619397): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (4914132): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (4914132): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (4914132): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (4914157): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (4914157): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (4914157): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 11959 Comm: syz.4.1427 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:lock_acquire+0xaf/0x330 kernel/locking/lockdep.c:5844 Code: 3d f5 68 4f 0e 00 0f 84 ce 00 00 00 65 8b 05 e8 a0 54 11 85 c0 0f 85 bf 00 00 00 65 48 8b 05 30 5b 54 11 83 b8 0c 0b 00 00 00 <0f> 85 aa 00 00 00 4c 89 74 24 10 4d 89 fe 9c 41 5f fa 48 c7 c7 22 RSP: 0018:ffffc90000006bd8 EFLAGS: 00000246 RAX: ffff88802a7a9e40 RBX: 0000000000000000 RCX: 0000000000000303 RDX: 0000000000000000 RSI: ffffffff8175a1b2 RDI: 1ffffffff1caaffc RBP: ffffffff8175a195 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000006d98 R11: ffffffff81af8c70 R12: 0000000000000002 R13: ffffffff8e557fe0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fcf785d36c0(0000) GS:ffff8881256d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000003 CR3: 000000007c6fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:302 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] class_rcu_constructor include/linux/rcupdate.h:1166 [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 kvfree_call_rcu+0x106/0x440 mm/slab_common.c:1994 cfg80211_update_known_bss+0x830/0x1590 net/wireless/scan.c:1944 __cfg80211_bss_update+0x147/0x2110 net/wireless/scan.c:1989 cfg80211_inform_single_bss_data+0xbc4/0x1ab0 net/wireless/scan.c:2369 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 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:5287 [inline] ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 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:rcu_read_unlock_special+0x1d/0x480 kernel/rcu/tree_plugin.h:773 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 8b 2d 8b 90 4a 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 89 RSP: 0018:ffffc9000bbaf280 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccf6b3 RDI: ffffffff8c075280 RBP: ffff8881256d3000 R08: ffffffff8fefab77 R09: 1ffffffff1fdf56e R10: dffffc0000000000 R11: fffffbfff1fdf56f R12: ffffffff8e55db78 R13: dffffc0000000000 R14: ffff8880b863b958 R15: 1ffff110170c772b __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:870 [inline] class_rcu_destructor include/linux/rcupdate.h:1166 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 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:5263 [inline] __schedule+0x152a/0x51d0 kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0x164/0x360 kernel/sched/core.c:6964 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0x1ee/0x420 kernel/futex/waitwake.c:687 futex_wait+0x119/0x380 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcf7a79bf79 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:00007fcf785d30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fcf7aa16278 RCX: 00007fcf7a79bf79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcf7aa16278 RBP: 00007fcf7aa16270 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcf7aa16308 R14: 00007ffe14bbe8f0 R15: 00007ffe14bbe9d8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 10875 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x1270 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 14 fa 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 bf f5 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 a3 f5 RSP: 0018:ffffc9000ad17720 EFLAGS: 00000293 RAX: ffffffff81b87a6d RBX: 1ffff110170c8579 RCX: ffff88802e325ac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000ad17860 R08: ffffffff8fefab77 R09: 1ffffffff1fdf56e R10: dffffc0000000000 R11: fffffbfff1fdf56f R12: ffff8880b8642bc8 R13: dffffc0000000000 R14: ffff8880b873bb40 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881257d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e734a1ba38 CR3: 000000000e344000 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+0x5f5/0x1160 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+0xab/0x290 mm/kfence/core.c:894 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340 worker_thread+0xda6/0x1360 kernel/workqueue.c:3421 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=5f74/1/0x4000000000000000 softirq=60573/60585 fqs=2808 rcu: hardirqs softirqs csw/system rcu: number: 1642160 0 0 rcu: cputime: 44288 8181 37 ==> 52470(ms) rcu: (t=10500 jiffies g=50937 q=13800 ncpus=2) CPU: 0 UID: 0 PID: 11959 Comm: syz.4.1427 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194 Code: f7 e8 ad 0e 03 f6 f7 c3 00 02 00 00 74 05 e8 30 3e 2e f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 64 d7 f4 f5 65 8b 05 4d c5 56 07 85 c0 74 18 5b 41 5e c3 cc cc RSP: 0018:ffffc90000007570 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000303 RDX: 0000000000000002 RSI: ffffffff8dccf6b3 RDI: 0000000000000001 RBP: 0000000000000246 R08: ffffffff8fefab77 R09: 1ffffffff1fdf56e R10: dffffc0000000000 R11: fffffbfff1fdf56f R12: ffff88805c9a1a08 R13: dffffc0000000000 R14: ffff8880336106d0 R15: ffff8880336106d0 FS: 00007fcf785d36c0(0000) GS:ffff8881256d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000003 CR3: 000000007c6fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] wiphy_work_queue+0x1d2/0x360 net/wireless/core.c:1715 __ieee80211_queue_skb_to_iface+0xf1/0x280 net/mac80211/rx.c:239 ieee80211_queue_skb_to_iface net/mac80211/rx.c:261 [inline] ieee80211_rx_h_mgmt+0x493/0x650 net/mac80211/rx.c:4157 ieee80211_rx_handlers+0x8fe1/0xc5b0 net/mac80211/rx.c:4232 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4262 [inline] ieee80211_prepare_and_rx_handle+0x25a1/0x67e0 net/mac80211/rx.c:5132 __ieee80211_rx_handle_packet net/mac80211/rx.c:5405 [inline] ieee80211_rx_list+0x266e/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 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:rcu_read_unlock_special+0x1d/0x480 kernel/rcu/tree_plugin.h:773 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 8b 2d 8b 90 4a 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 49 89 RSP: 0018:ffffc9000bbaf280 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccf6b3 RDI: ffffffff8c075280 RBP: ffff8881256d3000 R08: ffffffff8fefab77 R09: 1ffffffff1fdf56e R10: dffffc0000000000 R11: fffffbfff1fdf56f R12: ffffffff8e55db78 R13: dffffc0000000000 R14: ffff8880b863b958 R15: 1ffff110170c772b __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:870 [inline] class_rcu_destructor include/linux/rcupdate.h:1166 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 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:5263 [inline] __schedule+0x152a/0x51d0 kernel/sched/core.c:6867 __schedule_loop kernel/sched/core.c:6949 [inline] schedule+0x164/0x360 kernel/sched/core.c:6964 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0x1ee/0x420 kernel/futex/waitwake.c:687 futex_wait+0x119/0x380 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcf7a79bf79 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:00007fcf785d30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fcf7aa16278 RCX: 00007fcf7a79bf79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcf7aa16278 RBP: 00007fcf7aa16270 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcf7aa16308 R14: 00007ffe14bbe8f0 R15: 00007ffe14bbe9d8