watchdog: BUG: soft lockup - CPU#0 stuck for 128s! [syz.8.592:8310] Modules linked in: irq event stamp: 20353657 hardirqs last enabled at (20353656): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (20353657): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (20150972): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (20150972): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (20150972): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (20150975): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (20150975): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (20150975): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 8310 Comm: syz.8.592 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__kernel_text_address+0xf/0x40 kernel/extable.c:79 Code: ed 9a 00 eb b3 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 53 48 89 fb e8 43 00 00 00 85 c0 <0f> 95 c0 48 81 fb 00 50 ea 90 0f 93 c1 48 81 fb 00 22 01 91 0f 92 RSP: 0018:ffffc90000007738 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8b5ce555 RCX: 82a807cc5bdade01 RDX: 0000000000000001 RSI: ffffffff8d978ff2 RDI: ffffffff8b5ce555 RBP: ffffc900000077f0 R08: ffffc900000072d7 R09: 0000000000000000 R10: ffffc900000072c8 R11: fffff52000000e5b R12: ffff88801e370000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000000ef6 FS: 00007f4c1b6156c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005622dc2dece8 CR3: 0000000055374000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6668 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6779 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __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:__call_rcu_common kernel/rcu/tree.c:3118 [inline] RIP: 0010:call_rcu+0x13e/0x9c0 kernel/rcu/tree.c:3239 Code: 06 00 00 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 02 55 80 00 4c 89 73 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 e8 54 80 00 48 c7 03 00 00 00 00 48 89 df e8 f9 RSP: 0018:ffffc9000b3ef4a0 EFLAGS: 00000246 RAX: 1ffff920005fc000 RBX: ffffc90002fe0000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8d7922ac RDI: ffffc90002fe0008 RBP: ffffc9000b3ef5d0 R08: ffffffff8f821f77 R09: 1ffffffff1f043ee R10: dffffc0000000000 R11: fffffbfff1f043ef R12: dffffc0000000000 R13: 1ffff9200167dea4 R14: ffffffff8183c160 R15: 0000000000000000 thread_stack_delayed_free kernel/fork.c:287 [inline] free_thread_stack kernel/fork.c:379 [inline] release_task_stack kernel/fork.c:517 [inline] put_task_stack+0x133/0x1c0 kernel/fork.c:524 finish_task_switch+0x4b9/0x940 kernel/sched/core.c:5155 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+0x52/0xb0 arch/x86/lib/memset_64.S:77 Code: 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 47 38 <48> 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 RSP: 0018:ffffc9000b3efa58 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000d40 RCX: 0000000000000005 RDX: 0000000000000200 RSI: 0000000000000000 RDI: ffffc9000b3efae0 RBP: ffffc9000b3efc88 R08: ffffffff8f821f77 R09: 0000000000000000 R10: ffffc9000b3efa60 R11: fffffbfff1f043ef R12: 0000000000000050 R13: ffff88807858a700 R14: ffff88807858a750 R15: ffffc9000b3efa60 kasan_save_stack mm/kasan/common.c:53 [inline] kasan_save_track+0x2f/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 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] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270 lsm_inode_alloc security/security.c:228 [inline] security_inode_alloc+0x39/0x330 security/security.c:1189 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306 inode_init_always include/linux/fs.h:2883 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode_pseudo include/linux/fs.h:2964 [inline] sock_alloc net/socket.c:637 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1569 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: 0033:0x7f4c1a78f749 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:00007f4c1b615038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f4c1a9e5fa0 RCX: 00007f4c1a78f749 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000026 RBP: 00007f4c1a813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4c1a9e6038 R14: 00007f4c1a9e5fa0 R15: 00007ffff0e47b38 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7332 Comm: kworker/u8:18 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:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217 Code: 08 b0 7e 92 65 8b 15 c8 fd bc 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 74 2c 8b 91 48 16 00 00 <83> fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c RSP: 0018:ffffc90004f97618 EFLAGS: 00000246 RAX: ffffffff81b61c77 RBX: 1ffff110170c856d RCX: ffff88802e428000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90004f977a0 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: 00007f1ca59e6038 CR3: 000000000dd3a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xce7/0x12b0 kernel/smp.c:877 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 rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: