watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.3.6074:27336] Modules linked in: irq event stamp: 13237369 hardirqs last enabled at (13237368): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (13237368): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:550 [inline] hardirqs last enabled at (13237368): [] irqentry_exit+0x218/0x730 kernel/entry/common.c:164 hardirqs last disabled at (13237369): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (101274): [] do_softirq+0x76/0xd0 kernel/softirq.c:523 softirqs last disabled at (101277): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (101277): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (101277): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 27336 Comm: syz.3.6074 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:strlen+0x32/0x70 lib/string.c:420 Code: 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 <48> ff c3 49 8d 47 01 42 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07 RSP: 0018:ffffc90000a08498 EFLAGS: 00000297 RAX: 0000000000000006 RBX: ffffffff8bcdfa8d RCX: 000000008bcdfa05 RDX: ffffffff81770256 RSI: ffffffff8e95cce0 RDI: ffffffff8bcdfa80 RBP: ffffc90000a085c0 R08: 0000000000000022 R09: ffffffff8e95cce0 R10: ffffc90000a08758 R11: ffffffff81b0f560 R12: dffffc0000000000 R13: ffffffff81770256 R14: dffffc0000000000 R15: 000000000000000c FS: 00007fa4638296c0(0000) GS:ffff888125325000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 0000000032ed8000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: __fortify_strlen include/linux/fortify-string.h:266 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline] do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0xd5/0x410 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+0x38e/0x3c0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] class_rcu_destructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0x1bba/0x2550 arch/x86/kernel/unwind_orc.c:709 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 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:2689 [inline] slab_free mm/slub.c:6246 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6373 __ieee80211_rx_handle_packet net/mac80211/rx.c:-1 [inline] ieee80211_rx_list+0x2b89/0x3730 net/mac80211/rx.c:5636 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5659 ieee80211_rx include/net/mac80211.h:5395 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:938 handle_softirqs+0x22a/0x840 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline] RIP: 0010:__local_bh_enable_ip+0xd8/0x130 kernel/softirq.c:457 Code: 8b e8 3c 57 2e 0a 65 66 8b 05 0c c6 b7 11 66 85 c0 75 32 bf 01 00 00 00 e8 a5 f9 0b 00 e8 00 00 46 00 fb 65 8b 05 e8 c5 b7 11 <85> c0 75 05 e8 df d0 ab ff 5b 41 5e e9 47 2b 31 0a cc 90 0f 0b 90 RSP: 0018:ffffc90004f07268 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000046 RDX: 0000000000000006 RSI: ffffffff8dfd1f72 RDI: ffffffff8c2892e0 RBP: ffffc90004f07528 R08: ffffffff903339f7 R09: 1ffffffff206673e R10: dffffc0000000000 R11: fffffbfff206673f R12: ffff88805625e000 R13: 1ffff920009e0e70 R14: ffffffff898240b6 R15: 0000000000000000 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:912 [inline] __dev_queue_xmit+0x1fe5/0x3950 net/core/dev.c:4905 neigh_output include/net/neighbour.h:556 [inline] ip_finish_output2+0xca9/0x1070 net/ipv4/ip_output.c:237 ip_do_fragment+0x87c/0x1770 net/ipv4/ip_output.c:915 ip_send_skb net/ipv4/ip_output.c:1508 [inline] ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1528 raw_sendmsg+0x1547/0x1a50 net/ipv4/raw.c:659 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x80a/0x9f0 net/socket.c:2698 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa46299cdd9 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:00007fa463829028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa462c16090 RCX: 00007fa46299cdd9 RDX: 0000000000000004 RSI: 0000200000001ec0 RDI: 000000000000000f RBP: 00007fa462a32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa462c16128 R14: 00007fa462c16090 R15: 00007ffc549416f8 Sending NMI from CPU 1 to CPUs 0: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15882 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235 Code: a8 16 00 00 83 fa 02 75 21 48 8b 91 b0 16 00 00 48 8b 32 48 8d 7e 01 8b 89 ac 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 8f 56 f3 09 cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc90000007330 EFLAGS: 00000006 RAX: ffffffff81a61a05 RBX: 0000000100000492 RCX: ffff88802fb81ec0 RDX: 0000000000010000 RSI: ffffffff8e953380 RDI: 0000000000000002 RBP: ffffffff8e83dc50 R08: ffff88802fb81ec0 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000010000 R12: ffffc90000007480 R13: 0000000000000002 R14: 0000000000019230 R15: 8000000100000492 FS: 0000000000000000(0000) GS:ffff888125225000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffe7554ba0 CR3: 000000000e74a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: desc_read+0x1f5/0x3f0 kernel/printk/printk_ringbuffer.c:496 desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1931 [inline] prb_read kernel/printk/printk_ringbuffer.c:1999 [inline] _prb_read_valid+0x766/0xa80 kernel/printk/printk_ringbuffer.c:2170 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2242 printk_get_next_message+0x18b/0x880 kernel/printk/printk.c:3052 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x501/0xb20 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479 _printk+0xdd/0x130 kernel/printk/printk.c:2504 print_other_cpu_stall+0x1a9/0x1380 kernel/rcu/tree_stall.h:656 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline] rcu_pending kernel/rcu/tree.c:3679 [inline] rcu_sched_clock_irq+0x939/0x1050 kernel/rcu/tree.c:2716 update_process_times+0x23b/0x2f0 kernel/time/timer.c:2475 tick_sched_handle kernel/time/tick-sched.c:298 [inline] tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319 __run_hrtimer kernel/time/hrtimer.c:1930 [inline] __hrtimer_run_queues+0x375/0xa20 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xfcf/0x13d0 kernel/smp.c:892 Code: 79 45 8b 2e 44 89 ee 83 e6 01 31 ff e8 ea fc 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 95 f8 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 06 01 00 00 00 74 1e e8 7a f8 0b RSP: 0018:ffffc900059cf700 EFLAGS: 00000293 RAX: ffffffff81b9c636 RBX: ffff8880b863c108 RCX: ffff88802fb81ec0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900059cf840 R08: ffffffff903339f7 R09: 1ffffffff206673e R10: dffffc0000000000 R11: fffffbfff206673f R12: 1ffff110170e8161 R13: dffffc0000000000 R14: ffff8880b8740b08 R15: 0000000000000001 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2773 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2983 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+0x1fe/0x290 mm/kfence/core.c:913 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245