watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.8.1716:13030] Modules linked in: irq event stamp: 13349023 hardirqs last enabled at (13349022): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (13349023): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (4623954): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (4623954): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (4623954): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (4623957): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (4623957): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (4623957): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 13030 Comm: syz.8.1716 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:lock_acquire+0x274/0x340 kernel/locking/lockdep.c:-1 Code: 83 3d 7f 5d e2 0d 00 0f 85 1d fe ff ff e9 08 ff ff ff e8 5f 13 ab 09 f3 0f 1e fa 4c 89 6c 24 18 4c 89 64 24 20 4c 89 7c 24 28 <4c> 89 74 24 10 89 5c 24 08 65 8b 05 f0 c2 d8 10 83 f8 08 0f 83 a9 RSP: 0018:ffffc90000006a78 EFLAGS: 00000286 RAX: 40ea20511e141500 RBX: 0000000000000000 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df41cc0 RBP: ffffffff8173ef25 R08: 0000000000000000 R09: 0000000000000000 R10: ffffc90000006c38 R11: ffffffff81ad4bf0 R12: 0000000000000002 R13: ffffffff8df41cc0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fa45e4516c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d616ff8 CR3: 00000000620d2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559 kvfree_call_rcu+0x11b/0x480 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+0xbc8/0x1ad0 net/wireless/scan.c:2369 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5282 [inline] ieee80211_rx_list+0x2485/0x2f90 net/mac80211/rx.c:5539 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5562 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x358/0x550 kernel/softirq.c:925 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:perf_swevent_event+0xc/0x5e0 kernel/events/core.c:10553 Code: cb 34 00 e9 0f ff ff ff e8 e1 d7 56 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 e4 e0 48 81 ec a0 00 00 00 49 89 ce 48 89 54 RSP: 0018:ffffc9000b1b7360 EFLAGS: 00000287 RAX: ffffffff81f257cd RBX: 0000000000000000 RCX: ffff8880b8832fb0 RDX: ffffc9000b1b7400 RSI: 0000000000000001 RDI: ffff88807c433888 RBP: ffffc9000b1b7370 R08: ffffc9000b1b7417 R09: 0000000000000000 R10: ffffc9000b1b7408 R11: fffff52001636e83 R12: ffff88807c433888 R13: ffffc9000b1b7408 R14: ffff8880b8833038 R15: dffffc0000000000 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:11083 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11007 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2fb/0x340 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 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:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_noprof+0x367/0x6f0 mm/slub.c:5265 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:2884 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode_pseudo include/linux/fs.h:2965 [inline] sock_alloc net/socket.c:628 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1560 sock_create net/socket.c:1654 [inline] __sys_socket_create net/socket.c:1691 [inline] __sys_socket+0xd7/0x320 net/socket.c:1738 __do_sys_socket net/socket.c:1752 [inline] __se_sys_socket net/socket.c:1750 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1750 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: 0033:0x7fa45d58f749 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:00007fa45e451038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fa45d7e5fa0 RCX: 00007fa45d58f749 RDX: 0000000000000073 RSI: 0000000000000002 RDI: 000000000000000a RBP: 00007fa45d613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa45d7e6038 R14: 00007fa45d7e5fa0 R15: 00007ffd88433368 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8262 Comm: kworker/u8:42 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 94 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f5 8f 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 8f RSP: 0018:ffffc90003517620 EFLAGS: 00000293 RAX: ffffffff81b5bba7 RBX: 1ffff11017108545 RCX: ffff88802eb35b80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900035177a0 R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: ffff8880b8842a28 R13: dffffc0000000000 R14: ffff8880b893b9c0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7b0f59e80 CR3: 000000000dd3a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 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:854 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