watchdog: BUG: soft lockup - CPU#1 stuck for 25s! [kworker/u8:23:9978] Modules linked in: irq event stamp: 151014 hardirqs last enabled at (151013): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (151013): [] arm64_exit_to_kernel_mode+0x7c/0x90 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (151014): [] __el1_irq arch/arm64/kernel/entry-common.c:493 [inline] hardirqs last disabled at (151014): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:509 softirqs last enabled at (151008): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (151008): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (150979): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 9978 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 : ffff800092987720 x29: ffff800092987830 x28: dfff800000000000 x27: ffff0001ae1425c0 x26: 0000000000000011 x25: 0000000000000000 x24: ffff8000888df688 x23: ffffffffffffffff x22: 1fffe00035c284b8 x21: 1fffe00035c284b9 x20: ffff0001ae1239a8 x19: ffff0001ae1425c8 x18: 00000000969c44a2 x17: 00000000f936f77e x16: dfff800000000000 x15: 00000000dd700263 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a2f6c x2 : 0000000000000000 x1 : ffff00010405ba00 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+0x3f0/0x47c 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+0x78c/0x173c kernel/workqueue.c:3302 process_scheduled_works+0xdc/0x13c kernel/workqueue.c:3385 worker_thread+0x770/0xbd0 kernel/workqueue.c:3466 kthread+0x2f0/0x3c0 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 10202 Comm: syz.7.1256 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 : ffff80008e8d7ee0 x29: ffff80008e8d7f80 x28: ffff0000c7ecd710 x27: 0000000000000386 x26: ffff0000c7ecd708 x25: 1fffe00018fd9ae1 x24: 0068000141cb8bc3 x23: ffff0000c7ecd700 x22: dfff800000000000 x21: ffff0001ae11b2c0 x20: ffff80008887fecc x19: ffff0001ae11b2c0 x18: 1fffe00035c20e20 x17: ffff800125887000 x16: ffff80008e8d0000 x15: 0000000000000000 x14: 00005088996f9100 x13: 0000000000000001 x12: f5ff80008063e7b0 x11: ffff80008a343d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 000000000001b956 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080153db0 x2 : 0000000000000002 x1 : ffff0000c7ecd700 x0 : ffff800125887000 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:68 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:73 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:497 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:509 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:514 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 check_kcov_mode+0x4c/0x58 kernel/kcov.c:185 (P) __sanitizer_cov_trace_const_cmp8+0x24/0x30 kernel/kcov.c:321 pfn_valid+0x1f0/0x450 include/linux/mmzone.h:2290 page_table_check_clear+0x34/0x4e4 mm/page_table_check.c:70 __page_table_check_pte_clear+0xa0/0xc0 mm/page_table_check.c:155 page_table_check_pte_clear include/linux/page_table_check.h:55 [inline] __ptep_get_and_clear_anysz arch/arm64/include/asm/pgtable.h:1361 [inline] __ptep_get_and_clear arch/arm64/include/asm/pgtable.h:1381 [inline] __get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1402 [inline] get_and_clear_full_ptes arch/arm64/include/asm/pgtable.h:1817 [inline] zap_present_folio_ptes mm/memory.c:1632 [inline] zap_present_ptes mm/memory.c:1714 [inline] do_zap_pte_range mm/memory.c:1816 [inline] zap_pte_range mm/memory.c:1918 [inline] zap_pmd_range mm/memory.c:2004 [inline] zap_pud_range mm/memory.c:2032 [inline] zap_p4d_range mm/memory.c:2053 [inline] __zap_vma_range+0x29c0/0x4040 mm/memory.c:2093 unmap_vmas+0x254/0x3b8 mm/memory.c:2162 exit_mmap+0x1e8/0xaf8 mm/mmap.c:1300 __mmput+0xe4/0x2f0 kernel/fork.c:1178 mmput+0x70/0xa8 kernel/fork.c:1201 exit_mm+0x134/0x1e8 kernel/exit.c:581 do_exit+0x518/0x1a6c kernel/exit.c:963 do_group_exit+0x194/0x22c kernel/exit.c:1117 get_signal+0xfb0/0x1094 kernel/signal.c:3037 arch_do_signal_or_restart+0x284/0x43bc arch/arm64/kernel/signal.c:1665 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x70/0x17c kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:224 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:86 [inline] el0_svc+0x180/0x25c arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594