watchdog: BUG: soft lockup - CPU#1 stuck for 21s! [kworker/u8:0:12] Modules linked in: irq event stamp: 279918 hardirqs last enabled at (279917): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (279917): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (279918): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (279918): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (279910): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (279910): [] handle_softirqs+0xbc4/0xd34 kernel/softirq.c:650 softirqs last disabled at (279873): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 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 : ffff80008eab7780 x29: ffff80008eab7890 x28: dfff800000000000 x27: ffff0001a5ff5780 x26: 0000000000000011 x25: 0000000000000000 x24: ffff80008897f680 x23: ffffffffffffffff x22: 1fffe00034bfeaf0 x21: 1fffe00034bfeaf1 x20: ffff0001a5fd6b68 x19: ffff0001a5ff5788 x18: 000000003d9af656 x17: 000000006f4e3624 x16: dfff800000000000 x15: 00000000fb2e2f99 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000805a47c4 x2 : 0000000000000000 x1 : ffff0000c19e8000 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7483 Comm: syz.4.481 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 : ffff80008e987ee0 x29: ffff80008e987f80 x28: ffff0000deab8010 x27: 0000000000000386 x26: ffff0000deab8008 x25: 1fffe0001bd57001 x24: 1fffe00018d2ac2a x23: ffff0000deab8000 x22: dfff800000000000 x21: ffff0001a5fce480 x20: ffff80008891febc x19: ffff0001a5fce480 x18: 1fffe00034bfbe20 x17: ffff80011d69a000 x16: ffff80008e980000 x15: 0000000000000000 x14: 0000508a3bdc4400 x13: 0000000000000001 x12: 0000000000000000 x11: ffff80008a3f4d08 x10: 0000000000000003 x9 : 0000000000000000 x8 : 0000000000002774 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff800080155224 x2 : 0000000000000002 x1 : ffff0000deab8000 x0 : ffff80011d69a000 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:510 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:522 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:527 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 __raw_writew arch/arm64/include/asm/io.h:36 [inline] (P) writew include/asm-generic/io.h:279 [inline] (P) iowrite16 include/asm-generic/io.h:932 [inline] (P) vp_notify+0x70/0x8c drivers/virtio/virtio_pci_common.c:55 (P) virtqueue_notify drivers/virtio/virtio_ring.c:3036 [inline] virtqueue_kick+0x6c/0xec drivers/virtio/virtio_ring.c:3059 request_entropy+0x110/0x190 drivers/char/hw_random/virtio-rng.c:66 copy_data+0x118/0x248 drivers/char/hw_random/virtio-rng.c:77 virtio_read+0xc0/0x1b8 drivers/char/hw_random/virtio-rng.c:95 rng_get_data drivers/char/hw_random/core.c:225 [inline] rng_dev_read+0x194/0x650 drivers/char/hw_random/core.c:264 vfs_read+0x230/0x8e4 fs/read_write.c:572 ksys_read+0x12c/0x224 fs/read_write.c:717 __do_sys_read fs/read_write.c:726 [inline] __se_sys_read fs/read_write.c:724 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:724 __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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 IPVS: lc: UDP 224.0.0.2:0 - no destination available IPVS: lc: UDP 224.0.0.2:0 - no destination available