watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz.1.346:6289] Modules linked in: irq event stamp: 6167 hardirqs last enabled at (6166): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (6166): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (6167): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (6167): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (1984): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (1984): [] release_sock+0x150/0x228 net/core/sock.c:3870 softirqs last disabled at (1992): [] spin_lock_bh include/linux/spinlock.h:348 [inline] softirqs last disabled at (1992): [] lock_sock_nested+0x70/0x110 net/core/sock.c:3847 CPU: 0 UID: 0 PID: 6289 Comm: syz.1.346 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xd04 kernel/locking/qspinlock.c:197 lr : queued_spin_lock_slowpath+0x144/0xd04 kernel/locking/qspinlock.c:197 sp : ffff800095b87820 x29: ffff800095b878c0 x28: ffff0000c7121d50 x27: 1fffe0001e38cc3b x26: 1fffe00018e243aa x25: ffff0000c7121d40 x24: dfff800000000000 x23: ffff700012b70f08 x22: ffff700012b70f28 x21: ffff0000f1c661d8 x20: ffff0000f1c661e0 x19: ffff0000f1c661d0 x18: 1fffe00035bc5428 x17: 0000000000000003 x16: ffff800088b07000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff60001e38cc3b x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff800084c0e0f0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008690b44c 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:197 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x21c/0x2d0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:182 spin_lock_bh include/linux/spinlock.h:348 [inline] lock_sock_nested+0x70/0x110 net/core/sock.c:3847 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 __sys_connect_file+0x13c/0x184 net/socket.c:2135 __sys_connect+0x114/0x194 net/socket.c:2154 __do_sys_connect net/socket.c:2160 [inline] __se_sys_connect net/socket.c:2157 [inline] __arm64_sys_connect+0x7c/0x94 net/socket.c:2157 __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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6319 Comm: syz.4.350 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 43400005 (nZcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : in_softirq_really kernel/kcov.c:171 [inline] pc : check_kcov_mode+0x2c/0x54 kernel/kcov.c:183 lr : __sanitizer_cov_trace_pc+0x28/0x5c kernel/kcov.c:217 sp : ffff80008eb376f0 x29: ffff80008eb376f0 x28: 1fffe00018e17800 x27: dfff800000000000 x26: 1fffe00018e17805 x25: ffff0000c70bc028 x24: dfff800000000000 x23: ffff0000d9919aa0 x22: ffff800082b54914 x21: 0000000000000000 x20: ffff0000c68657c0 x19: ffff800082b549d4 x18: 00000000ffffffff x17: ffff80008a791000 x16: 0000000000000003 x15: ffff80008a31ada0 x14: ffff80008a590e28 x13: 000000000000000e x12: 0000000000000000 x11: 0000000000000000 x10: 1fffe00018e17805 x9 : 0000000000000301 x8 : 0000000000000301 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800082b549a8 x2 : 0000000000000000 x1 : ffff0000c68657c0 x0 : 0000000000000002 Call trace: preempt_count arch/arm64/include/asm/preempt.h:12 [inline] (P) in_softirq_really kernel/kcov.c:171 [inline] (P) check_kcov_mode+0x2c/0x54 kernel/kcov.c:183 (P) bond_select_queue+0xc0/0x12c drivers/net/bonding/bond_main.c:5416 netdev_core_pick_tx+0x128/0x318 net/core/dev.c:4739 __dev_queue_xmit+0x458/0x2bc0 net/core/dev.c:4830 dev_queue_xmit include/linux/netdevice.h:3446 [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:622 __do_softirq+0x14/0x20 kernel/softirq.c:656 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:78 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:889 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:83 invoke_softirq kernel/softirq.c:503 [inline] __irq_exit_rcu+0x1ac/0x428 kernel/softirq.c:735 irq_exit_rcu+0x14/0x84 kernel/softirq.c:752 __el1_irq arch/arm64/kernel/entry-common.c:510 [inline] el1_interrupt+0x40/0x60 arch/arm64/kernel/entry-common.c:522 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:527 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:590 __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) lock_acquire+0x16c/0x364 kernel/locking/lockdep.c:5871 (P) __might_fault+0xc0/0x114 mm/memory.c:7292 _inline_copy_from_user+0x38/0x174 include/linux/uaccess.h:169 copy_from_user include/linux/uaccess.h:222 [inline] copy_msghdr_from_user+0xb8/0x194 net/socket.c:2614 recvmsg_copy_msghdr net/socket.c:2870 [inline] ___sys_recvmsg+0x11c/0x1f4 net/socket.c:2942 do_recvmmsg+0x288/0x7d4 net/socket.c:3041 __sys_recvmmsg+0x1e0/0x270 net/socket.c:3115 __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __arm64_sys_recvmmsg+0xdc/0x104 net/socket.c:3131 __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:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz.4.350:6319] Modules linked in: irq event stamp: 300665 hardirqs last enabled at (300664): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (300664): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (300665): [] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline] hardirqs last disabled at (300665): [] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522 softirqs last enabled at (288146): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (288146): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (293961): [] __do_softirq+0x14/0x20 kernel/softirq.c:656