watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.9.524:8062] Modules linked in: irq event stamp: 8130945 hardirqs last enabled at (8130944): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (8130945): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (3173542): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (3173542): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (3173542): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (3173545): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (3173545): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (3173545): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 8062 Comm: syz.9.524 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:_compound_head include/linux/page-flags.h:286 [inline] RIP: 0010:virt_to_folio include/linux/mm.h:1247 [inline] RIP: 0010:virt_to_slab mm/slab.h:191 [inline] RIP: 0010:check_slab_allocation+0x2c/0x130 mm/kasan/common.c:228 Code: 41 56 41 54 53 48 89 d3 49 89 f6 49 89 ff 4c 8b 25 a9 58 4e 0b 48 89 f7 e8 51 3f 50 ff 48 c1 e8 06 48 83 e0 c0 49 8b 4c 04 08 c1 01 0f 85 91 00 00 00 49 01 c4 0f 1f 44 00 00 41 0f b6 44 24 RSP: 0018:ffffc90000007018 EFLAGS: 00000206 RAX: 0000000000a0f2c0 RBX: ffffffff8aaf25b9 RCX: ffffea0000a0f201 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000212008 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: ffffea0000000000 R13: 0000000000000000 R14: ffff8880283cb000 R15: ffff88813fe26dc0 FS: 00007fdf2deec6c0(0000) GS:ffff88812638a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2db20ff8 CR3: 00000000281e4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kasan_slab_pre_free include/linux/kasan.h:198 [inline] slab_free_hook mm/slub.c:2459 [inline] slab_free mm/slub.c:6566 [inline] kfree+0x148/0x6d0 mm/slub.c:6773 ieee80211_inform_bss+0xbd9/0x10a0 net/mac80211/scan.c:160 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd02/0x1ac0 net/wireless/scan.c:2385 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3240 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3331 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:226 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:355 __ieee80211_rx_handle_packet net/mac80211/rx.c:5194 [inline] ieee80211_rx_list+0x20d5/0x2b40 net/mac80211/rx.c:5447 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5470 ieee80211_rx include/net/mac80211.h:5214 [inline] ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:453 tasklet_action_common+0x369/0x580 kernel/softirq.c:925 handle_softirqs+0x283/0x870 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:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:generic_exec_single+0x481/0x500 kernel/smp.c:453 Code: 75 11 e8 b2 7f 0b 00 48 85 db 75 16 e8 a8 7f 0b 00 eb 15 e8 a1 7f 0b 00 e8 fc cd 81 09 48 85 db 74 ea e8 92 7f 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 66 43 c7 44 2c RSP: 0018:ffffc900030979c0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88802075dac0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003097a90 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: 1ffff92000612f3c R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000612f5d smp_call_function_single+0x351/0x590 kernel/smp.c:684 task_function_call kernel/events/core.c:121 [inline] perf_install_in_context+0x593/0x8f0 kernel/events/core.c:3107 __do_sys_perf_event_open kernel/events/core.c:13735 [inline] __se_sys_perf_event_open+0x193a/0x1d70 kernel/events/core.c:13377 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: 0033:0x7fdf2cf8eec9 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:00007fdf2deec038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fdf2d1e5fa0 RCX: 00007fdf2cf8eec9 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007fdf2d011f91 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdf2d1e6038 R14: 00007fdf2d1e5fa0 R15: 00007ffcbd302638 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8106 Comm: kworker/u8:16 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+0xd38/0x12d0 kernel/smp.c:877 Code: 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 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 25 6f 0b 00 eb e4 44 RSP: 0018:ffffc9000b517660 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff11017108439 RCX: ffff88802e773c80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000b5177e0 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: ffff8880b88421c8 R13: dffffc0000000000 R14: ffff8880b893b200 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88812648a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb5c117d60 CR3: 000000000db36000 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: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:852 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 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