watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.9.8515:10308] Modules linked in: irq event stamp: 15284571 hardirqs last enabled at (15284570): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (15284571): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13796712): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13796712): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13796712): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13796715): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13796715): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13796715): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 10308 Comm: syz.9.8515 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:unwind_next_frame+0xc7d/0x23c0 arch/x86/kernel/unwind_orc.c:-1 Code: 48 89 d0 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 99 15 00 00 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 b0 15 00 00 48 0f bf 02 <49> 01 c4 48 8d 5e 01 48 8b 44 24 40 0f b6 04 28 84 c0 0f 85 68 11 RSP: 0018:ffffc90000a084b8 EFLAGS: 00000246 RAX: 0000000000000060 RBX: ffffffff90a5ec55 RCX: ffffffff9029d938 RDX: ffffffff90a5ec54 RSI: ffffffff90a5ec58 RDI: ffffffff8c27b320 RBP: dffffc0000000000 R08: 0000000000000009 R09: ffffffff8e75e3e0 R10: ffffc90000a085e8 R11: fffff520001410c9 R12: ffffc90000a08588 R13: ffffc90000a08638 R14: ffffc90000a085e8 R15: ffffc90000a08620 FS: 00007f56f073a6c0(0000) GS:ffff888125563000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe6fce11700 CR3: 0000000046f58000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __unwind_start+0x5b8/0x760 arch/x86/kernel/unwind_orc.c:773 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24 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_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2692 [inline] slab_free mm/slub.c:6168 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6298 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] ip6_mc_input+0x8de/0xbd0 net/ipv6/ip6_input.c:593 NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318 __netif_receive_skb_one_core net/core/dev.c:6164 [inline] __netif_receive_skb net/core/dev.c:6277 [inline] process_backlog+0x7dd/0x1950 net/core/dev.c:6628 __napi_poll+0xae/0x340 net/core/dev.c:7692 napi_poll net/core/dev.c:7755 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7912 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:stack_depot_save_flags+0x3f3/0x810 lib/stackdepot.c:730 Code: 48 83 3d ef 5a 71 15 00 75 0a 4c 89 35 e6 5a 71 15 45 31 f6 e8 8e 90 ba fc 48 c7 c7 f0 ad f1 8e 48 8b 74 24 10 e8 dd f6 c5 06 <4d> 85 f6 74 16 41 f7 c5 00 0c 00 00 74 2a 4c 89 f7 be 02 00 00 00 RSP: 0018:ffffc900035d6808 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880596fe190 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8def4b2d RDI: 00000000ffffffff RBP: 00000000118d0629 R08: ffffffff90118bb7 R09: 1ffffffff2023176 R10: dffffc0000000000 R11: fffffbfff2023177 R12: ffff88823bb06290 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888043be9f00 kasan_save_stack+0x4d/0x60 mm/kasan/common.c:58 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5298 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6908 preempt_schedule_notrace+0x57/0x90 kernel/sched/core.c:7185 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+0x38b/0x410 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 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_noprof mm/page_alloc.c:5284 [inline] alloc_pages_bulk_noprof+0x558/0x700 mm/page_alloc.c:5204 alloc_pages_bulk_mempolicy_noprof+0x34e/0x1680 mm/mempolicy.c:2792 vm_area_alloc_pages mm/vmalloc.c:3706 [inline] __vmalloc_area_node mm/vmalloc.c:3876 [inline] __vmalloc_node_range_noprof+0xa32/0x1730 mm/vmalloc.c:4064 __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:6228 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339 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: 0033:0x7f56ef79c799 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:00007f56f073a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f56efa15fa0 RCX: 00007f56ef79c799 RDX: 0000000000000094 RSI: 0000200000000f80 RDI: 0000000000000005 RBP: 00007f56ef832bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f56efa16038 R14: 00007f56efa15fa0 R15: 00007ffd7bb20f08 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:lookup_object lib/debugobjects.c:440 [inline] RIP: 0010:debug_object_deactivate+0xc0/0x3a0 lib/debugobjects.c:892 Code: 00 00 00 4d 85 ed 74 49 45 31 e4 eb 0c 4d 8b 6d 00 41 ff c4 4d 85 ed 74 38 49 8d 5d 18 48 89 dd 48 c1 ed 03 42 80 7c 35 00 00 <74> 08 48 89 df e8 26 45 77 fd 4c 39 3b 74 41 4c 89 e8 48 c1 e8 03 RSP: 0018:ffffc90000007ce8 EFLAGS: 00000046 RAX: 1ffffffff34a4662 RBX: ffff88805fa83a28 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007c40 RBP: 1ffff1100bf50745 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000000f88 R12: 0000000000000000 R13: ffff88805fa83a10 R14: dffffc0000000000 R15: ffff8880b8628be0 FS: 0000000000000000(0000) GS:ffff888125463000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005600389f3168 CR3: 00000000b2d2c000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: debug_hrtimer_deactivate kernel/time/hrtimer.c:451 [inline] __run_hrtimer kernel/time/hrtimer.c:1753 [inline] __hrtimer_run_queues+0x2c5/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline] RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478 Code: 0f 84 44 ff ff ff e8 42 2d 21 00 fb eb 44 e8 3a 2d 21 00 e8 15 72 09 0a 4d 85 f6 74 94 e8 2b 2d 21 00 fb 48 c7 c7 20 08 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 16 RSP: 0018:ffffc90000a77ba0 EFLAGS: 00000293 RAX: ffffffff81a47085 RBX: ffffffff81a46eff RCX: ffff88801dea9e80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e750820 RBP: ffffc90000a77c50 R08: ffffffff90118bb7 R09: 1ffffffff2023176 R10: dffffc0000000000 R11: fffffbfff2023177 R12: 0000000000000000 R13: 000000000000001e R14: 0000000000000200 R15: 1ffff9200014ef78 _printk+0xdd/0x130 kernel/printk/printk.c:2504 check_hung_task kernel/hung_task.c:257 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:331 [inline] watchdog+0xb7f/0x1030 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245