watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.0.1384:11365] Modules linked in: irq event stamp: 12345415 hardirqs last enabled at (12345414): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (12345415): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (10642482): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (10642482): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (10642482): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (10642485): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (10642485): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (10642485): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 11365 Comm: syz.0.1384 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:bpf_prog_inc_misses_counter+0x5d/0xb0 kernel/bpf/syscall.c:2458 Code: 80 55 00 4c 8b 3b 4d 85 ff 74 51 e8 0d 61 76 09 89 c5 89 c3 bf 08 00 00 00 89 c6 e8 1d 71 ef ff 83 fd 07 77 3e e8 d3 6c ef ff <48> 8d 1c dd d0 ed 92 8d 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 RSP: 0018:ffffc90000006e78 EFLAGS: 00000246 RAX: ffffffff81d09a0d RBX: 0000000000000000 RCX: ffff888025828000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81cb7417 R10: dffffc0000000000 R11: fffff91ffff9c205 R12: 0000000000000001 R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000607ed9b07290 FS: 00007fd6f02ee6c0(0000) GS:ffff888126138000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e020ff8 CR3: 00000000311ce000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: bpf_prog_inc_misses_counters include/linux/bpf.h:3451 [inline] trace_call_bpf+0x9c2/0xb60 kernel/trace/bpf_trace.c:123 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10931 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 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+0x311/0x360 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] ref_tracker_alloc+0x133/0x460 lib/ref_tracker.c:271 __netdev_tracker_alloc include/linux/netdevice.h:4375 [inline] netdev_hold include/linux/netdevice.h:4404 [inline] dst_init+0xd9/0x450 net/core/dst.c:52 dst_alloc+0x12a/0x170 net/core/dst.c:93 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3322 ndisc_send_skb+0x3f1/0x1510 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_count_add+0x6/0x1a0 kernel/sched/core.c:5784 Code: 24 e8 ae 27 96 00 eb 8c e9 f1 fe ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 <41> 56 53 49 bf 00 00 00 00 00 fc ff df 48 c7 c0 60 c3 79 99 48 c1 RSP: 0018:ffffc90003cdea50 EFLAGS: 00000246 RAX: ffffffff81cb7920 RBX: 0000000000000001 RCX: 0000000000000002 RDX: ffff888025828000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc90003cdeb78 R08: ffffc90003cdeb0f R09: 0000000000000000 R10: ffffc90003cdeb00 R11: ffffffffa0201694 R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff888025828480 class_preempt_constructor include/linux/preempt.h:470 [inline] __migrate_enable include/linux/sched.h:2366 [inline] migrate_enable include/linux/sched.h:2417 [inline] bpf_prog_run_array include/linux/bpf.h:2359 [inline] trace_call_bpf+0x5e4/0xb60 kernel/trace/bpf_trace.c:145 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10931 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 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+0x311/0x360 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 __unwind_start+0x5b9/0x760 arch/x86/kernel/unwind_orc.c:758 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe4/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 __alloc_pages_noprof mm/page_alloc.c:5217 [inline] alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5137 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline] __kasan_populate_vmalloc mm/kasan/shadow.c:370 [inline] kasan_populate_vmalloc+0xd1/0x270 mm/kasan/shadow.c:435 alloc_vmap_area+0xd7a/0x14c0 mm/vmalloc.c:2098 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3193 __vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3974 bpf_prog_alloc_no_stats+0x4a/0x4d0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:153 bpf_prog_load+0x735/0x1a10 kernel/bpf/syscall.c:2991 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6163 __do_sys_bpf kernel/bpf/syscall.c:6273 [inline] __se_sys_bpf kernel/bpf/syscall.c:6271 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6271 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd6ef38f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd6f02ee038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd6ef5e5fa0 RCX: 00007fd6ef38f749 RDX: 0000000000000094 RSI: 0000200000000740 RDI: 0000000000000005 RBP: 00007fd6ef413f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd6ef5e6038 R14: 00007fd6ef5e5fa0 R15: 00007ffe7f69d518 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:15 [inline] RIP: 0010:raw_atomic64_read include/linux/atomic/atomic-arch-fallback.h:2583 [inline] RIP: 0010:raw_atomic_long_read include/linux/atomic/atomic-long.h:38 [inline] RIP: 0010:atomic_long_read include/linux/atomic/atomic-instrumented.h:3189 [inline] RIP: 0010:desc_read+0x12a/0x3f0 kernel/printk/printk_ringbuffer.c:444 Code: 8d 2c c4 48 89 ef be 08 00 00 00 e8 d0 bf 84 00 48 89 e9 48 c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 89 4c 24 28 80 3c 01 00 <74> 08 48 89 ef e8 3c bd 84 00 48 b8 ff ff ff ff ff ff ff 3f 4c 8b RSP: 0018:ffffc90000a77478 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffffffff1bcaa88 RCX: 1ffffffff1bc64c2 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8de32610 RBP: ffffffff8de32610 R08: ffffffff8de32617 R09: 1ffffffff1bc64c2 R10: dffffc0000000000 R11: fffffbfff1bc64c3 R12: ffffffff8de19440 R13: 00000000ffffffff R14: 00000000ffffe000 R15: 000000000000000d FS: 0000000000000000(0000) GS:ffff888126238000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000066738000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1892 [inline] prb_read kernel/printk/printk_ringbuffer.c:1960 [inline] _prb_read_valid+0x608/0xa90 kernel/printk/printk_ringbuffer.c:2131 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2203 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:2978 console_emit_next_record kernel/printk/printk.c:3065 [inline] console_flush_all+0x4ca/0xb10 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3298 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423 _printk+0xcf/0x120 kernel/printk/printk.c:2448 check_hung_task kernel/hung_task.c:247 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:323 [inline] watchdog+0xaf8/0xfa0 kernel/hung_task.c:495 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245