watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.8.1178:11369] Modules linked in: irq event stamp: 12202019 hardirqs last enabled at (12202018): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (12202019): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (12183312): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (12183312): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (12183312): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (12183315): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (12183315): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (12183315): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 11369 Comm: syz.8.1178 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:103 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:238 [inline] RIP: 0010:unwind_next_frame+0x51d/0x23c0 arch/x86/kernel/unwind_orc.c:510 Code: 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 4c 01 f8 <49> 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8 4d 0f 46 RSP: 0018:ffffc90000a08578 EFLAGS: 00000297 RAX: ffffffff822f83b2 RBX: ffffffff9032fe64 RCX: dffffc0000000000 RDX: ffffffff9032fe2c RSI: ffffffff90b3a9a8 RDI: ffffffff8c27a420 RBP: ffffffff9032fe2c R08: 000000000000000f R09: ffffffff8e7602e0 R10: ffffc90000a08300 R11: ffffffffa02019d0 R12: ffffffff822f8371 R13: ffffffff9032fe2c R14: ffffc90000a08648 R15: ffffffff9032fe48 FS: 00007ff48dbd56c0(0000) GS:ffff888125566000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff48dbb4d58 CR3: 000000007d93e000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_mempool_poison_object+0x172/0x1e0 mm/kasan/common.c:539 kasan_mempool_poison_object include/linux/kasan.h:363 [inline] napi_skb_cache_put+0x7b/0x6f0 net/core/skbuff.c:1473 __free_old_xmit+0x2cd/0x680 drivers/net/virtio_net.c:-1 virtnet_free_old_xmit drivers/net/virtio_net.c:636 [inline] free_old_xmit drivers/net/virtio_net.c:1081 [inline] virtnet_poll_tx+0x457/0x16a0 drivers/net/virtio_net.c:3230 __napi_poll+0xae/0x340 net/core/dev.c:7685 napi_poll net/core/dev.c:7748 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7900 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__schedule+0x158d/0x5340 kernel/sched/core.c:6864 Code: d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 09 b0 81 f6 4c 89 2b 4c 89 e7 4c 89 ee e8 3b 52 85 f5 48 89 c7 e8 a3 ee e6 f5 <31> ff 4d 39 ec 40 0f 95 c7 e8 c5 f7 e6 f5 48 8b 84 24 d8 00 00 00 RSP: 0018:ffffc90004106a40 EFLAGS: 00000202 RAX: 00000000000419e5 RBX: ffff8880b873adc8 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8def196a RDI: ffffffff8c27a480 RBP: ffffc90004106c40 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff88802c238000 R13: ffff88802c238000 R14: dffffc0000000000 R15: 1ffff110170e75b3 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7184 preempt_schedule_notrace_thunk+0x16/0x30 arch/x86/entry/thunk.S:13 class_preempt_notrace_destructor include/linux/preempt.h:469 [inline] perf_trace_lock_acquire+0x3a3/0x440 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x2a4/0x2e0 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 save_stack+0x122/0x230 mm/page_owner.c:165 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2485 alloc_frozen_pages_noprof mm/mempolicy.c:2556 [inline] alloc_pages_noprof+0xa8/0x190 mm/mempolicy.c:2576 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5309 __kasan_populate_vmalloc_do mm/kasan/shadow.c:364 [inline] __kasan_populate_vmalloc+0x38/0x1d0 mm/kasan/shadow.c:424 kasan_populate_vmalloc include/linux/kasan.h:580 [inline] alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232 __vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline] __vmalloc_noprof+0xd2/0x120 mm/vmalloc.c:4140 bpf_prog_alloc_no_stats+0x4a/0x4f0 kernel/bpf/core.c:107 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:156 bpf_prog_load+0x7ba/0x1ae0 kernel/bpf/syscall.c:2993 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6229 __do_sys_bpf kernel/bpf/syscall.c:6342 [inline] __se_sys_bpf kernel/bpf/syscall.c:6340 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6340 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff48f99c629 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff48dbd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff48fc16090 RCX: 00007ff48f99c629 RDX: 0000000000000048 RSI: 000020000000e000 RDI: 0000000000000005 RBP: 00007ff48fa32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff48fc16128 R14: 00007ff48fc16090 R15: 00007ffe7fa15788 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 11381 Comm: kworker/u8:11 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x17/0x70 kernel/kcov.c:217 Code: cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 68 13 56 11 65 8b 15 89 13 56 11 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 54 16 00 00 RSP: 0018:ffffc900045f7718 EFLAGS: 00000202 RAX: ffffffff81b9addd RBX: 1ffff110170e812d RCX: ffff888028358000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900045f7860 R08: ffffffff901172b7 R09: 1ffffffff2022e56 R10: dffffc0000000000 R11: fffffbfff2022e57 R12: ffff8880b8740968 R13: dffffc0000000000 R14: ffff8880b863bf80 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125466000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fca0e4504e0 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:342 [inline] smp_call_function_many_cond+0xcfd/0x12c0 kernel/smp.c:877 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:72 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2746 [inline] smp_text_poke_batch_finish+0x5f5/0x1160 arch/x86/kernel/alternative.c:2956 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:899 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358 worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245