watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.4.397:7633] Modules linked in: irq event stamp: 15089033 hardirqs last enabled at (15089032): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (15089033): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (13656240): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (13656240): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (13656240): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (13656243): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (13656243): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (13656243): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 7633 Comm: syz.4.397 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:memcmp lib/string.c:-1 [inline] RIP: 0010:bcmp+0x17c/0x230 lib/string.c:715 Code: 08 00 00 00 48 89 fd 48 89 c7 49 89 d5 e8 5c d9 cf f6 48 89 ef 48 8b 34 24 4c 89 ea e9 0d ff ff ff 48 85 d2 0f 84 95 00 00 00 <31> db 48 8d 04 1f 48 89 c1 48 c1 e9 03 42 0f b6 0c 39 84 c9 75 2b RSP: 0018:ffffc90000007030 EFLAGS: 00000206 RAX: ffffffff8944723e RBX: ffff88807caee756 RCX: ffff88803131bc00 RDX: 0000000000000006 RSI: ffff8880296ee9c0 RDI: ffff88807caee756 RBP: 0000000000000004 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000000dfc R12: ffff8880296ee800 R13: 0000000000000006 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f88e7e056c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000001 CR3: 00000000692fa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000200 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: _Z6memcmpPKvU25pass_dynamic_object_size0S0_U25pass_dynamic_object_size0m include/linux/fortify-string.h:727 [inline] __neigh_update+0x4db/0x25a0 net/core/neighbour.c:1307 neigh_update net/core/neighbour.c:1437 [inline] neigh_event_ns+0xb5/0x170 net/core/neighbour.c:1466 arp_process+0x134a/0x17a0 net/ipv4/arp.c:852 NF_HOOK+0x30d/0x3a0 include/linux/netfilter.h:314 __netif_receive_skb_list_ptype net/core/dev.c:5935 [inline] __netif_receive_skb_list_core+0x436/0x800 net/core/dev.c:5967 __netif_receive_skb_list net/core/dev.c:6029 [inline] netif_receive_skb_list_internal+0x975/0xcc0 net/core/dev.c:6120 gro_normal_list include/net/gro.h:532 [inline] gro_normal_one include/net/gro.h:546 [inline] gro_skb_finish net/core/gro.c:601 [inline] gro_receive_skb+0x5dc/0xc10 net/core/gro.c:631 napi_gro_receive include/linux/netdevice.h:4149 [inline] virtnet_receive_done+0xd1f/0x1af0 drivers/net/virtio_net.c:2534 receive_buf+0xa40/0x1580 drivers/net/virtio_net.c:2578 virtnet_receive_packets drivers/net/virtio_net.c:2926 [inline] virtnet_receive drivers/net/virtio_net.c:2950 [inline] virtnet_poll+0x1f9b/0x2d70 drivers/net/virtio_net.c:3045 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__schedule+0x15a/0x4cd0 kernel/sched/core.c:6664 Code: e8 03 42 80 3c 28 00 74 08 48 89 df e8 8f 0e cb f6 4c 8b 3b 4d 8d a7 40 e6 76 92 4c 89 e0 48 c1 e8 03 48 89 84 24 d0 00 00 00 <42> 80 3c 28 00 74 08 4c 89 e7 e8 67 0e cb f6 4d 8b 34 24 49 8d 5e RSP: 0018:ffffc900036266c0 EFLAGS: 00000a02 RAX: 1ffff110171074c8 RBX: ffffffff8d96dc10 RCX: 5afd9356d5bbd700 RDX: 0000000000000000 RSI: ffffffff8bc1cdc0 RDI: ffffffff8bc1cd80 RBP: ffffc900036268d0 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffff8880b883a640 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff8881260cc000 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5891 Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 7b 20 d7 10 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90003626a50 EFLAGS: 00000206 RAX: 5afd9356d5bbd700 RBX: 0000000000000206 RCX: 5afd9356d5bbd700 RDX: 0000000000000000 RSI: ffffffff8d9350da RDI: ffffffff8bc1cde0 RBP: ffff88803131c6f0 R08: ffffc90003627f48 R09: 0000000000000000 R10: ffffc90003626bd8 R11: fffff520006c4d7d R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8df3b860 R15: ffff88803131bc00 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [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 mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4341 [inline] __kmalloc_node_noprof+0x276/0x4e0 mm/slub.c:4347 kmalloc_node_noprof include/linux/slab.h:932 [inline] __vmalloc_area_node mm/vmalloc.c:3647 [inline] __vmalloc_node_range_noprof+0x51a/0x12c0 mm/vmalloc.c:3844 __vmalloc_node_noprof mm/vmalloc.c:3907 [inline] vmalloc_noprof+0x79/0x90 mm/vmalloc.c:3940 bpf_prog_calc_tag+0xb9/0x620 kernel/bpf/core.c:303 resolve_pseudo_ldimm64+0xbc/0xc60 kernel/bpf/verifier.c:20086 bpf_check+0x1bfd/0x19a70 kernel/bpf/verifier.c:24007 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2971 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5834 __do_sys_bpf kernel/bpf/syscall.c:5941 [inline] __se_sys_bpf kernel/bpf/syscall.c:5939 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5939 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f88e6f8e969 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:00007f88e7e05038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f88e71b6080 RCX: 00007f88e6f8e969 RDX: 0000000000000080 RSI: 0000200000000140 RDI: 0000000000000005 RBP: 00007f88e7010ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f88e71b6080 R15: 00007ffff13f2df8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5838 Comm: kworker/u9:4 Not tainted 6.15.0-rc4-syzkaller-gb4432656b36e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: hci4 hci_cmd_timeout RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:409 Code: e8 1e 40 82 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ff 34 e4 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07 RSP: 0000:ffffc9000540f3b8 EFLAGS: 00000006 RAX: 1ffffffff3369705 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc9000540f590 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff853d7e60 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff99b4bbc0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1cfb64a009 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: serial_port_in include/linux/serial_core.h:791 [inline] serial8250_console_write+0x581/0x1ba0 drivers/tty/serial/8250/8250_port.c:3420 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x725/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 bt_err+0x10b/0x160 net/bluetooth/lib.c:296 hci_cmd_timeout+0xff/0x1e0 net/bluetooth/hci_core.c:1457 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245