watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [kworker/u8:32:7191] Modules linked in: irq event stamp: 9751080 hardirqs last enabled at (9751079): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (9751079): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:550 [inline] hardirqs last enabled at (9751079): [] irqentry_exit+0x246/0x790 kernel/entry/common.c:164 hardirqs last disabled at (9751080): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (9751078): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (9751078): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (9751078): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (9750825): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (9750825): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (9750825): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 7191 Comm: kworker/u8:32 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x58e/0x1700 kernel/smp.c:892 Code: 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 c9 7f 0c 00 f3 90 41 0f b6 45 00 <41> 38 c4 7c 08 84 c0 0f 85 63 0f 00 00 8b 45 08 31 ff 83 e0 01 41 RSP: 0018:ffffc90004f67870 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fcd87d RDX: ffff8880360e9ec0 RSI: ffffffff81fcd857 RDI: ffff8880360e9ec0 RBP: ffff8880b8443140 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed1017088629 R14: 0000000000000001 R15: ffff8880b853c6c0 FS: 0000000000000000(0000) GS:ffff8881243f0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2d20fdc270 CR3: 000000000e596000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 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+0x337/0xc60 arch/x86/kernel/alternative.c:2983 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x37a/0x550 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:906 [inline] toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:898 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 27214 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:find_held_lock+0x6f/0x80 kernel/locking/lockdep.c:5373 Code: 37 a3 b1 09 85 c0 75 19 83 ed 01 48 83 eb 28 83 fd ff 74 0b 0f b6 43 49 32 43 21 a8 60 74 da 31 db 41 89 6d 00 48 89 d8 5b 5d <41> 5c 41 5d 41 5e e9 11 74 2b ff 66 0f 1f 44 00 00 90 90 90 90 90 RSP: 0018:ffffc90000007d60 EFLAGS: 00000002 RAX: ffff88809129c988 RBX: ffff88805578b2c0 RCX: ffffc90000007d8c RDX: 0000000000000004 RSI: ffff88805578b2c0 RDI: ffff88809129c988 RBP: ffffffff899ee0fb R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88805578b2c0 R13: ffffc90000007d8c R14: 0000000000000004 R15: 0000000000000004 FS: 000055556e237500(0000) GS:ffff8881242f0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8cfefdb6b0 CR3: 00000000a486e000 CR4: 0000000000350ef0 Call Trace: __lock_release kernel/locking/lockdep.c:5535 [inline] lock_release kernel/locking/lockdep.c:5889 [inline] lock_release+0xdb/0x310 kernel/locking/lockdep.c:5875 __raw_spin_unlock include/linux/spinlock_api_smp.h:167 [inline] _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:190 spin_unlock include/linux/spinlock.h:390 [inline] advance_sched+0x62b/0xc80 net/sched/sch_taprio.c:987 __run_hrtimer kernel/time/hrtimer.c:1930 [inline] __hrtimer_run_queues+0x470/0xa00 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:229 [inline] RIP: 0010:unwind_next_frame+0x23d/0x2090 arch/x86/kernel/unwind_orc.c:510 Code: 89 74 24 20 89 44 24 18 e8 a0 aa bc 00 48 8b 4c 24 30 48 8b 44 24 28 8b 74 24 20 44 8b 5c 24 18 8d 50 01 8b 0c 8d ec d3 37 92 <48> b8 00 00 00 00 00 fc ff df 48 8d 3c 95 ec d3 37 92 49 89 f8 49 RSP: 0018:ffffc90004d1ec50 EFLAGS: 00000246 RAX: 000000000000b894 RBX: 0000000000000001 RCX: 0000000000019484 RDX: 000000000000b895 RSI: 00000000000a9a91 RDI: ffffffff923ab63c RBP: ffffc90004d1ed08 R08: 0000000000000000 R09: 0000000000000007 R10: 0000000000000200 R11: 000000000000b894 R12: ffffc90004d1ed10 R13: ffffc90004d1ecc0 R14: ffffc90004d1ecf5 R15: ffffffff81b894e9 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/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+0x127/0x6c0 mm/slub.c:6373 mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch.isra.0+0xb0e/0x1010 kernel/sched/core.c:5269 context_switch kernel/sched/core.c:5390 [inline] __schedule+0x10f1/0x6820 kernel/sched/core.c:7188 preempt_schedule_notrace+0x5f/0xd0 kernel/sched/core.c:7462 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 rcu_is_watching+0x8e/0xc0 kernel/rcu/tree.c:753 rcu_read_lock include/linux/rcupdate.h:839 [inline] class_rcu_constructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0x6fa/0x2090 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 save_stack+0x162/0x1e0 mm/page_owner.c:165 __reset_page_owner+0x84/0x190 mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1394 [inline] free_unref_folios+0xa0d/0x16f0 mm/page_alloc.c:2996 folios_put_refs+0x53c/0x840 mm/swap.c:1002 folio_batch_release include/linux/folio_batch.h:101 [inline] shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1149 shmem_truncate_range mm/shmem.c:1277 [inline] shmem_evict_inode+0x3f3/0xc40 mm/shmem.c:1407 evict+0x3c2/0xad0 fs/inode.c:841 iput_final fs/inode.c:1960 [inline] iput.part.0+0x605/0xf50 fs/inode.c:2009 iput+0x35/0x40 fs/inode.c:1975 filename_unlinkat+0x466/0x730 fs/namei.c:5572 __do_sys_unlink fs/namei.c:5603 [inline] __se_sys_unlink fs/namei.c:5600 [inline] __x64_sys_unlink+0x46/0x70 fs/namei.c:5600 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f742139b907 Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff637ddbc8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f742139b907 RDX: 00007fff637ddbf0 RSI: 00007fff637ddc80 RDI: 00007fff637ddc80 RBP: 00007fff637ddc80 R08: 00007fff637dec80 R09: 00000000ffffffff R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff637ded10 R13: 00007f7421432048 R14: 00000000001c9a1d R15: 00007fff637ded50