watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [kworker/u8:6:2926] Modules linked in: irq event stamp: 1010720 hardirqs last enabled at (1010719): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:515 [inline] hardirqs last enabled at (1010719): [] arm64_exit_to_kernel_mode+0x7c/0x90 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (1010720): [] __el1_irq arch/arm64/kernel/entry-common.c:493 [inline] hardirqs last disabled at (1010720): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:509 softirqs last enabled at (1010718): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (1010718): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (1010605): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 0 UID: 0 PID: 2926 Comm: kworker/u8:6 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 : ffff800099a17720 x29: ffff800099a17830 x28: dfff800000000000 x27: ffff0001ae11d5c0 x26: 0000000000000011 x25: 0000000000000001 x24: ffff8000888df688 x23: ffffffffffffffff x22: 1fffe00035c23ab8 x21: 1fffe00035c23ab9 x20: ffff0001ae146ee8 x19: ffff0001ae11d5c8 x18: 00000000214b7df4 x17: 000000005616b110 x16: dfff800000000000 x15: 00000000c0f58265 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 : ffff0000cfe5d700 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11563 Comm: syz.0.1636 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 : ffff80008e8e7ee0 x29: ffff80008e8e7f80 x28: ffff0000c4c9ba10 x27: 0000000000000386 x26: ffff0000c4c9ba08 x25: 1fffe00018993741 x24: ffff0000efbd4bb8 x23: ffff0000c4c9ba00 x22: dfff800000000000 x21: ffff0001ae1402c0 x20: ffff80008887fecc x19: ffff0001ae1402c0 x18: 1fffe00035c20e20 x17: ffff8001258ac000 x16: ffff80008e8e0000 x15: 0000000000000000 x14: 0000507ed59df400 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a343d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 000000000001635e x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080153db0 x2 : 0000000000000002 x1 : ffff0000c4c9ba00 x0 : ffff8001258ac000 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 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:167 [inline] (P) fault_in_readable+0x110/0x1bc mm/gup.c:2161 (P) fault_in_iov_iter_readable+0x1d0/0x22c lib/iov_iter.c:106 generic_perform_write+0x670/0x7b8 mm/filemap.c:4374 shmem_file_write_iter+0x10c/0x134 mm/shmem.c:3478 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x52c/0xa14 fs/read_write.c:688 ksys_write+0x12c/0x224 fs/read_write.c:740 __do_sys_write fs/read_write.c:751 [inline] __se_sys_write fs/read_write.c:748 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:748 __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+0x60/0x25c arch/arm64/kernel/entry-common.c:723 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:742 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594