watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz.4.757:9646] Modules linked in: irq event stamp: 7219 hardirqs last enabled at (7218): [<ffff8000869882e4>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (7218): [<ffff8000869882e4>] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (7219): [<ffff8000869842b8>] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (7219): [<ffff8000869842b8>] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (512): [<ffff800084c58d00>] spin_unlock_bh include/linux/spinlock.h:407 [inline] softirqs last enabled at (512): [<ffff800084c58d00>] release_sock+0x150/0x228 net/core/sock.c:3869 softirqs last disabled at (534): [<ffff800084c6cefc>] spin_lock_bh include/linux/spinlock.h:353 [inline] softirqs last disabled at (534): [<ffff800084c6cefc>] lock_sock_nested+0x70/0x110 net/core/sock.c:3846 CPU: 1 UID: 0 PID: 9646 Comm: syz.4.757 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xd04 kernel/locking/qspinlock.c:219 lr : queued_spin_lock_slowpath+0x144/0xd04 kernel/locking/qspinlock.c:219 sp : ffff800092e27820 x29: ffff800092e278c0 x28: ffff0000c661bb10 x27: 1fffe00018b3e03b x26: 1fffe00018cc3762 x25: ffff0000c661bb00 x24: dfff800000000000 x23: ffff7000125c4f08 x22: ffff7000125c4f28 x21: ffff0000c59f01d8 x20: ffff0000c59f01e0 x19: ffff0000c59f01d0 x18: 1fffe00035ba3828 x17: 0000000000000003 x16: ffff800088bf7000 x15: ffff800084c4c414 x14: ffff800084c4c310 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600018b3e03b x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff800084c6cefc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000869aa754 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:231 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) queued_spin_lock_slowpath+0x138/0xd04 kernel/locking/qspinlock.c:219 (P) queued_spin_lock include/asm-generic/qspinlock.h:115 [inline] do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:183 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:205 spin_lock_bh include/linux/spinlock.h:353 [inline] lock_sock_nested+0x70/0x110 net/core/sock.c:3846 lock_sock include/net/sock.h:1713 [inline] llc_ui_wait_for_conn net/llc/af_llc.c:607 [inline] llc_ui_connect+0x4c0/0xa04 net/llc/af_llc.c:519 connect_socket net/socket.c:2141 [inline] __sys_connect_file+0x13c/0x184 net/socket.c:2166 __sys_connect+0x114/0x194 net/socket.c:2183 __do_sys_connect net/socket.c:2189 [inline] __se_sys_connect net/socket.c:2186 [inline] __arm64_sys_connect+0x84/0x9c net/socket.c:2186 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 41 Comm: pr/ttyAMA-1 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __sanitizer_cov_trace_pc+0x10/0x5c kernel/kcov.c:209 lr : bond_select_queue+0xc0/0x12c drivers/net/bonding/bond_main.c:5410 sp : ffff80008ec376f0 x29: ffff80008ec376f0 x28: 1fffe0001906c800 x27: dfff800000000000 x26: 1fffe0001906c805 x25: ffff0000c8364028 x24: dfff800000000000 x23: ffff0000d8d90320 x22: ffff800082b98c4c x21: 0000000000000000 x20: 0000000000000000 x19: 0000000000000000 x18: 1fffe00035b9ec28 x17: ffff800084e8340c x16: ffff800084e7f75c x15: ffff800084e82c48 x14: ffff80008b0df2b0 x13: 000000000000000e x12: 0000000000000000 x11: 0000000000000000 x10: 1fffe0001906c805 x9 : 0000000000000302 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800082b98ce0 x2 : 0000000000000000 x1 : ffff0000c24b9d80 x0 : 0000000000000000 Call trace: __sanitizer_cov_trace_pc+0x10/0x5c kernel/kcov.c:206 (P) bond_select_queue+0xc0/0x12c drivers/net/bonding/bond_main.c:5410 netdev_core_pick_tx+0x128/0x318 net/core/dev.c:4787 __dev_queue_xmit+0x458/0x2bc0 net/core/dev.c:4878 dev_queue_xmit include/linux/netdevice.h:3461 [inline] llc_conn_send_pdus+0x120/0x1b0 net/llc/llc_conn.c:338 llc_conn_send_pdu+0x30/0x40 net/llc/llc_conn.c:176 llc_conn_ac_send_sabme_cmd_p_set_x+0x244/0x35c net/llc/llc_c_ac.c:788 llc_exec_conn_trans_actions net/llc/llc_conn.c:437 [inline] llc_conn_service net/llc/llc_conn.c:362 [inline] llc_conn_state_process+0x430/0x115c net/llc/llc_conn.c:66 llc_process_tmr_ev net/llc/llc_c_ac.c:1442 [inline] llc_conn_tmr_common_cb+0x2c0/0x6c4 net/llc/llc_c_ac.c:1325 llc_conn_ack_tmr_cb+0x24/0x34 net/llc/llc_c_ac.c:1350 call_timer_fn+0x194/0xa4c kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2374 [inline] __run_timer_base+0x530/0x744 kernel/time/timer.c:2386 run_timer_base+0x84/0x1b8 kernel/time/timer.c:2395 run_timer_softirq+0x20/0x48 kernel/time/timer.c:2405 handle_softirqs+0x2ec/0xd98 kernel/softirq.c:645 __do_softirq+0x14/0x20 kernel/softirq.c:679 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:885 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:526 [inline] __irq_exit_rcu+0x1c0/0x458 kernel/softirq.c:767 irq_exit_rcu+0x14/0x84 kernel/softirq.c:784 __el1_irq arch/arm64/kernel/entry-common.c:531 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:543 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:548 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:586 __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] (P) _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:221 (P) spin_unlock_irqrestore include/linux/spinlock.h:425 [inline] __uart_port_unlock_irqrestore include/linux/serial_core.h:622 [inline] pl011_console_device_unlock+0x94/0xcc drivers/tty/serial/amba-pl011.c:2721 nbcon_emit_one+0x160/0x1e4 kernel/printk/nbcon.c:1165 nbcon_kthread_func+0x56c/0x6c0 kernel/printk/nbcon.c:1271 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [pr/ttyAMA-1:41] Modules linked in: irq event stamp: 118491 hardirqs last enabled at (118490): [<ffff8000869882e4>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (118490): [<ffff8000869882e4>] __arm64_exit_to_kernel_mode+0x64/0x78 arch/arm64/kernel/entry-common.c:60 hardirqs last disabled at (118491): [<ffff8000869842b8>] __el1_irq arch/arm64/kernel/entry-common.c:527 [inline] hardirqs last disabled at (118491): [<ffff8000869842b8>] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:543 softirqs last enabled at (113040): [<ffff800080311114>] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (113040): [<ffff800080311114>] handle_softirqs+0xc28/0xd98 kernel/softirq.c:673 softirqs last disabled at (113061): [<ffff8000800204c0>] __do_softirq+0x14/0x20 kernel/softirq.c:679