watchdog: BUG: soft lockup - CPU#1 stuck for 128s! [syz.0.218:6670] Modules linked in: irq event stamp: 21298269 hardirqs last enabled at (21298268): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (21298269): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (20545054): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (20545054): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (20545054): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (20545057): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (20545057): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (20545057): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6670 Comm: syz.0.218 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:read_seqbegin arch/x86/include/asm/irqflags.h:-1 [inline] RIP: 0010:neigh_hh_output include/net/neighbour.h:510 [inline] RIP: 0010:neigh_output include/net/neighbour.h:554 [inline] RIP: 0010:ip_finish_output2+0x9ed/0x1160 net/ipv4/ip_output.c:237 Code: d9 f6 0a f8 4d 85 f6 75 16 e8 cf f6 0a f8 eb 15 e8 c8 f6 0a f8 e8 13 ee 92 01 4d 85 f6 74 ea e8 b9 f6 0a f8 fb 48 8b 5c 24 20 <48> 8b 44 24 50 42 0f b6 04 28 84 c0 0f 85 9b 01 00 00 48 8b 44 24 RSP: 0018:ffffc90000a07840 EFLAGS: 00000246 RAX: ffffffff89b653a7 RBX: ffff88805359fad8 RCX: ffff888056711e80 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000a07980 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: ffff88802391d1f0 R13: dffffc0000000000 R14: 0000000000000200 R15: ffff88802391d1e0 FS: 00007f46d798b6c0(0000) GS:ffff8881261b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8b28872b60 CR3: 0000000028580000 CR4: 00000000003526f0 Call Trace: NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x118d/0x1c30 net/ipv4/ip_output.c:534 __tcp_transmit_skb+0x24f6/0x3aa0 net/ipv4/tcp_output.c:1631 tcp_rcv_established+0x18ae/0x2580 net/ipv4/tcp_input.c:6435 tcp_v4_do_rcv+0xa90/0x1430 net/ipv4/tcp_ipv4.c:1881 tcp_v4_rcv+0x2675/0x2f20 net/ipv4/tcp_ipv4.c:2324 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:207 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:241 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 dst_input include/net/dst.h:474 [inline] ip_sublist_rcv_finish+0x221/0x2a0 net/ipv4/ip_input.c:584 ip_list_rcv_finish net/ipv4/ip_input.c:636 [inline] ip_sublist_rcv+0x74c/0xa10 net/ipv4/ip_input.c:644 ip_list_rcv+0x3e2/0x430 net/ipv4/ip_input.c:678 __netif_receive_skb_list_ptype net/core/dev.c:6180 [inline] __netif_receive_skb_list_core+0x7d2/0x800 net/core/dev.c:6227 __netif_receive_skb_list net/core/dev.c:6279 [inline] netif_receive_skb_list_internal+0x96f/0xcb0 net/core/dev.c:6370 gro_normal_list include/net/gro.h:524 [inline] gro_normal_one include/net/gro.h:544 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x632/0xca0 net/core/gro.c:633 receive_buf+0xb01/0x17e0 drivers/net/virtio_net.c:2675 virtnet_receive_packets drivers/net/virtio_net.c:3023 [inline] virtnet_receive drivers/net/virtio_net.c:3047 [inline] virtnet_poll+0x2087/0x2e70 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 handle_softirqs+0x27d/0x850 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: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:strlen+0x3f/0x70 lib/string.c:420 Code: 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 e9 4e RSP: 0018:ffffc90003e2eb98 EFLAGS: 00000202 RAX: 0000000000000006 RBX: ffffffff8b6c1147 RCX: ec5cf98bf195f000 RDX: ffffffff8173ef25 RSI: ffffffff8df41cc0 RDI: ffffffff8b6c1140 RBP: ffffc90003e2ecc0 R08: ffffc90003e2f700 R09: 0000000000000000 R10: ffffc90003e2ee58 R11: fffff520007c5dcd R12: 1ffff920007c5d80 R13: ffffffff8173ef25 R14: dffffc0000000000 R15: 0000000000000005 __fortify_strlen include/linux/fortify-string.h:268 [inline] trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline] do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0xc2/0x3b0 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+0x389/0x3b0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:put_cpu_partial+0x234/0x2d0 mm/slub.c:3960 Code: 41 5c 41 5d 41 5e 41 5f 5d e9 48 5c 2f 09 cc 90 0f 0b 90 e9 e7 fe ff ff e8 49 74 2c 09 41 f7 c5 00 02 00 00 74 b2 fb 4d 85 ff <75> b1 eb ba e8 33 74 2c 09 e9 4f fe ff ff 90 0f 0b 90 e9 66 ff ff RSP: 0018:ffffc90003e2f6c8 EFLAGS: 00000246 RAX: ec5cf98bf195f000 RBX: ffff88801def4c80 RCX: ec5cf98bf195f000 RDX: 0000000000000007 RSI: ffffffff8d76bea1 RDI: ffffffff8bbfc660 RBP: 0000000000000001 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6f R12: 0000000000000001 R13: 0000000000000282 R14: ffff8880b8943340 R15: 0000000000000000 __slab_free+0x288/0x2a0 mm/slub.c:5947 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] __do_kmalloc_node mm/slub.c:5651 [inline] __kmalloc_node_noprof+0x522/0x810 mm/slub.c:5658 kmalloc_node_noprof include/linux/slab.h:987 [inline] __vmalloc_area_node mm/vmalloc.c:3702 [inline] __vmalloc_node_range_noprof+0x5bb/0x12d0 mm/vmalloc.c:3897 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3974 bpf_prog_alloc_no_stats+0x4a/0x500 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:154 bpf_prog_load+0x735/0x1a10 kernel/bpf/syscall.c:2992 __sys_bpf+0x5c3/0x8a0 kernel/bpf/syscall.c:6207 __do_sys_bpf kernel/bpf/syscall.c:6320 [inline] __se_sys_bpf kernel/bpf/syscall.c:6318 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6318 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f46d6b8f749 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:00007f46d798b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f46d6de5fa0 RCX: 00007f46d6b8f749 RDX: 0000000000000094 RSI: 0000200000000680 RDI: 0000000000000005 RBP: 00007f46d6c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f46d6de6038 R14: 00007f46d6de5fa0 R15: 00007fffb52aeff8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 18 Comm: rcu_exp_gp_kthr Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x9f/0x2c0 mm/kasan/generic.c:200 Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 de 01 00 00 49 ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd RSP: 0018:ffffc90000177630 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff81c90817 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8f805b70 RBP: ffffc900001777d0 R08: ffffffff8f805b77 R09: 1ffffffff1f00b6e R10: dffffc0000000000 R11: fffffbfff1f00b6e R12: 0000000000000001 R13: 0000000000000001 R14: fffffbfff1f00b6f R15: 1ffffffff1f00b6e FS: 0000000000000000(0000) GS:ffff8881260b0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe70a7cf80 CR3: 0000000032a6e000 CR4: 00000000003526f0 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] cpumask_test_cpu include/linux/cpumask.h:647 [inline] cpu_online include/linux/cpumask.h:1229 [inline] __do_trace_irq_disable include/trace/events/preemptirq.h:36 [inline] trace_irq_disable+0x87/0x100 include/trace/events/preemptirq.h:36 console_emit_next_record kernel/printk/printk.c:3122 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x685/0xb60 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3359 vprintk_emit+0x4f8/0x5f0 kernel/printk/printk.c:2426 _printk+0xcf/0x120 kernel/printk/printk.c:2451 synchronize_rcu_expedited_stall+0x61/0x1170 kernel/rcu/tree_exp.h:570 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:668 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:687 [inline] rcu_exp_sel_wait_wake+0x867/0xe20 kernel/rcu/tree_exp.h:721 kthread_worker_fn+0x4f0/0xb20 kernel/kthread.c:1005 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246