watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [kworker/u8:23:5776] Modules linked in: irq event stamp: 477428 hardirqs last enabled at (477427): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (477427): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (477428): [] __el1_irq arch/arm64/kernel/entry-common.c:510 [inline] hardirqs last disabled at (477428): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:526 softirqs last enabled at (477426): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (477426): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (477369): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 5776 Comm: kworker/u8:23 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_unbound toggle_allocation_gate pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:342 [inline] pc : smp_call_function_many_cond+0xfa4/0x1614 kernel/smp.c:892 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xfbc/0x1614 kernel/smp.c:892 sp : ffff8000994e7780 x29: ffff8000994e7890 x28: dfff800000000000 x27: ffff0001ae10b5c0 x26: 0000000000000011 x25: 0000000000000001 x24: ffff8000888ef688 x23: ffffffffffffffff x22: 1fffe00035c216b8 x21: 1fffe00035c216b9 x20: ffff0001ae134ee8 x19: ffff0001ae10b5c8 x18: 1fffe00035c1ea20 x17: ffff8000888eb000 x16: ffff80008899dba0 x15: ffff0001ae0f510c x14: 000000008037a9bc x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a3760 x2 : 0000000000000000 x1 : ffff0000cce45700 x0 : 0000000000000000 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:342 [inline] (P) smp_call_function_many_cond+0xfa4/0x1614 kernel/smp.c:892 (P) smp_call_function_many kernel/smp.c:915 [inline] smp_call_function+0x58/0xbc kernel/smp.c:935 kick_all_cpus_sync+0x28/0x34 kernel/smp.c:1081 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x314/0x33c kernel/jump_label.c:521 jump_label_update+0x41c/0x4a8 kernel/jump_label.c:910 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:210 static_key_enable+0x24/0x38 kernel/jump_label.c:223 toggle_allocation_gate+0xb8/0x28c mm/kfence/core.c:906 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x79c/0x1098 kernel/workqueue.c:3397 worker_thread+0x754/0xba0 kernel/workqueue.c:3478 kthread+0x2f8/0x3c8 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7508 Comm: syz.9.507 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : handle_softirqs+0x1d0/0xd34 kernel/softirq.c:610 lr : handle_softirqs+0x1cc/0xd34 kernel/softirq.c:606 sp : ffff80008e8f7ee0 x29: ffff80008e8f7f80 x28: ffff0000c7de8010 x27: 0000000000000186 x26: ffff0000c7de8008 x25: 1fffe00018fbd001 x24: fffffdffc46e7308 x23: ffff0000c7de8000 x22: dfff800000000000 x21: ffff0001ae12e2c0 x20: ffff80008888fecc x19: ffff0001ae12e2c0 x18: 0000000000000000 x17: ffff80012588a000 x16: ffff80008e8f0000 x15: 0000000000000000 x14: 00005082206d3b00 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a356d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000002cfe x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080154bd4 x2 : 0000000000000003 x1 : ffff0000c7de8000 x0 : ffff80012588a000 Call trace: __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P) handle_softirqs+0x1d0/0xd34 kernel/softirq.c:606 (P) __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:514 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:526 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:531 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) memcg1_commit_charge+0xcc/0x12c mm/memcontrol-v1.c:603 (P) charge_memcg+0x1e4/0x27c mm/memcontrol.c:5021 __mem_cgroup_charge+0x38/0xa0 mm/memcontrol.c:5032 mem_cgroup_charge include/linux/memcontrol.h:644 [inline] shmem_alloc_and_add_folio+0x63c/0xec8 mm/shmem.c:1985 shmem_get_folio_gfp+0x4c8/0x1494 mm/shmem.c:2564 shmem_fault+0x15c/0x32c mm/shmem.c:2765 __do_fault+0xf4/0x4a0 mm/memory.c:5458 do_read_fault mm/memory.c:5893 [inline] do_fault mm/memory.c:6027 [inline] do_pte_missing+0x1918/0x28a4 mm/memory.c:4550 handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault mm/memory.c:6549 [inline] handle_mm_fault+0x1564/0x245c mm/memory.c:6718 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x678/0x20f0 mm/gup.c:1428 populate_vma_page_range+0x260/0x358 mm/gup.c:1860 __mm_populate+0x200/0x324 mm/gup.c:1963 mm_populate include/linux/mm.h:4137 [inline] vm_mmap_pgoff+0x3a4/0x470 mm/util.c:586 ksys_mmap_pgoff+0xd0/0x5b4 mm/mmap.c:606 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594