watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.7.3923:25110] Modules linked in: irq event stamp: 7177961 hardirqs last enabled at (7177960): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (7177961): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (746312): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (746312): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (746312): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (746315): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (746315): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (746315): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 25110 Comm: syz.7.3923 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:perf_trace_lock_acquire+0x1a5/0x440 include/trace/events/lock.h:24 Code: 48 83 3b 00 0f 84 c4 01 00 00 48 8d 74 24 60 48 8d 94 24 80 00 00 00 41 8d 7d 24 83 e7 f8 83 c7 fc 89 7c 24 14 e8 8b b4 2e 00 <48> 85 c0 0f 84 9b 01 00 00 48 89 c3 4c 89 64 24 28 4c 8b 64 24 60 RSP: 0018:ffffc90000a08160 EFLAGS: 00000286 RAX: ffffe8ffffdd7000 RBX: ffffffff8e62c2a8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffe8ffffdd702c RBP: ffffc90000a08260 R08: 0000000000000004 R09: 0000000000000004 R10: ffffe8ffffdd7024 R11: fffff91ffffbae06 R12: ffffffff8e62c240 R13: 000000000000000d R14: dffffc0000000000 R15: 1ffff92000141034 FS: 00007f8e547cd6c0(0000) GS:ffff888125567000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055966a5e4fd8 CR3: 0000000060756000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __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 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837 __build_skb+0x62/0x440 net/core/skbuff.c:492 build_skb+0x23/0x250 net/core/skbuff.c:508 virtnet_build_skb drivers/net/virtio_net.c:834 [inline] page_to_skb+0x161/0x870 drivers/net/virtio_net.c:876 receive_mergeable drivers/net/virtio_net.c:2497 [inline] receive_buf+0x546/0x1900 drivers/net/virtio_net.c:2643 virtnet_receive_packets drivers/net/virtio_net.c:2970 [inline] virtnet_receive drivers/net/virtio_net.c:2994 [inline] virtnet_poll+0x21f0/0x2fe0 drivers/net/virtio_net.c:3083 __napi_poll+0xae/0x340 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7899 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:__kasan_check_byte+0x4/0x40 mm/kasan/common.c:572 Code: 4c 89 f6 5b 41 5c 41 5e 41 5f e9 17 fa 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 0f 1f 40 d6 <41> 56 53 48 89 f3 49 89 fe e8 8e 15 00 00 84 c0 75 16 be 01 00 00 RSP: 0018:ffffc9000213ece0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff931c2150 RCX: 0000000080000002 RDX: ffffc90010a19000 RSI: ffffffff81d14a73 RDI: ffffffff8e7602e0 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff91ffffbaa05 R12: 0000000000000002 R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x79/0x2e0 kernel/locking/lockdep.c:5842 rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] trace_call_bpf+0xe3/0xb70 kernel/trace/bpf_trace.c:-1 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11301 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x32d/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] is_bpf_text_address+0x28d/0x2b0 kernel/bpf/core.c:750 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26 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:2687 [inline] slab_free mm/slub.c:6124 [inline] kfree+0x1c1/0x630 mm/slub.c:6442 free_func_state kernel/bpf/verifier.c:1678 [inline] free_verifier_state+0xaf/0x230 kernel/bpf/verifier.c:1694 pop_stack kernel/bpf/verifier.c:2103 [inline] free_states kernel/bpf/verifier.c:24388 [inline] do_check_common+0x1ae9/0x25b0 kernel/bpf/verifier.c:24548 do_check_main kernel/bpf/verifier.c:24627 [inline] bpf_check+0x5f3e/0x1ce00 kernel/bpf/verifier.c:25951 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3089 __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: 0033:0x7f8e5659c799 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:00007f8e547cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f8e56816090 RCX: 00007f8e5659c799 RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005 RBP: 00007f8e56632bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8e56816128 R14: 00007f8e56816090 R15: 00007ffe0313b708 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 25108 Comm: syz.2.3922 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:kasan_check_range+0x1ca/0x2c0 mm/kasan/generic.c:200 Code: dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 5b 41 5c <41> 5d 41 5e 41 5f 5d e9 ca 63 80 09 cc 45 84 ff 0f 85 a1 00 00 00 RSP: 0018:ffffc90000006cb0 EFLAGS: 00000293 RAX: 0000000000000001 RBX: 000000000000000d RCX: ffffffff81a0c3b6 RDX: 0000000000000000 RSI: 000000000000000d RDI: ffffffff8bce0080 RBP: ffffc90000006e00 R08: 0000000000000004 R09: 0000000000000006 R10: dffffc0000000000 R11: fffffbfff179c011 R12: ffffffff81a0c3b6 R13: 000000000000000e R14: fffffbfff179c012 R15: 1ffffffff179c010 FS: 00007f0381dcd6c0(0000) GS:ffff888125467000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555863174e8 CR3: 00000000820fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x2d6/0x440 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 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:2687 [inline] slab_free mm/slub.c:6124 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6254 skb_kfree_head net/core/skbuff.c:1087 [inline] skb_free_head net/core/skbuff.c:1101 [inline] skb_release_data+0x6c3/0x940 net/core/skbuff.c:1128 skb_release_all net/core/skbuff.c:1203 [inline] __kfree_skb+0x5d/0x210 net/core/skbuff.c:1217 arp_process+0xfb2/0x18a0 net/ipv4/arp.c:943 NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1 __netif_receive_skb_list_ptype net/core/dev.c:6204 [inline] __netif_receive_skb_list_core+0x765/0x810 net/core/dev.c:6246 __netif_receive_skb_list net/core/dev.c:6298 [inline] netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6389 gro_normal_list include/net/gro.h:523 [inline] gro_normal_one include/net/gro.h:543 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x632/0xd40 net/core/gro.c:633 receive_buf+0xb09/0x1900 drivers/net/virtio_net.c:2658 virtnet_receive_packets drivers/net/virtio_net.c:2970 [inline] virtnet_receive drivers/net/virtio_net.c:2994 [inline] virtnet_poll+0x21f0/0x2fe0 drivers/net/virtio_net.c:3083 __napi_poll+0xae/0x340 net/core/dev.c:7684 napi_poll net/core/dev.c:7747 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7899 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:__sanitizer_cov_trace_pc+0x49/0x70 kernel/kcov.c:223 Code: 81 fa 00 01 00 00 75 35 83 b9 54 16 00 00 00 74 2c 8b 91 30 16 00 00 83 fa 02 75 21 48 8b 91 38 16 00 00 48 8b 32 48 8d 7e 01 <8b> 89 34 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 e9 3f 6d RSP: 0018:ffffc90000a462d8 EFLAGS: 00000246 RAX: ffffffff81d14ee7 RBX: ffff88802b3ef598 RCX: ffff88807dee8000 RDX: ffffc90017f47000 RSI: 00000000000518a7 RDI: 00000000000518a8 RBP: ffffc90000a463f8 R08: ffffc90000a4638f R09: 0000000000000000 R10: ffffc90000a46380 R11: ffffffffa020348c R12: ffff88802b3ef5a8 R13: 00000000000002e5 R14: 0000000000000001 R15: 0000000000000000 bpf_prog_run_array include/linux/bpf.h:2469 [inline] trace_call_bpf+0x557/0xb70 kernel/trace/bpf_trace.c:145 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11301 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x32d/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 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:2687 [inline] slab_free mm/slub.c:6124 [inline] kfree+0x1c1/0x630 mm/slub.c:6442 free_slab_obj_exts mm/slub.c:2259 [inline] unaccount_slab mm/slub.c:3412 [inline] __free_slab+0x149/0x290 mm/slub.c:3516 __slab_free+0x263/0x2b0 mm/slub.c:5532 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:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4501 [inline] slab_alloc_node mm/slub.c:4830 [inline] __do_kmalloc_node mm/slub.c:5218 [inline] __kmalloc_noprof+0x316/0x760 mm/slub.c:5231 fq_init include/net/fq_impl.h:365 [inline] ieee80211_txq_setup_flows+0x1c1/0xef0 net/mac80211/tx.c:1588 ieee80211_register_hw+0x30e4/0x4220 net/mac80211/main.c:1539 mac80211_hwsim_new_radio+0x2f97/0x5330 drivers/net/wireless/virtual/mac80211_hwsim.c:5810 hwsim_new_radio_nl+0xf35/0x1bd0 drivers/net/wireless/virtual/mac80211_hwsim.c:6504 genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x61c/0x7a0 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 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: 0033:0x7f0383b9c799 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:00007f0381dcd028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0383e16090 RCX: 00007f0383b9c799 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 000000000000000d RBP: 00007f0383c32bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0383e16128 R14: 00007f0383e16090 R15: 00007ffc0b6b8e88