watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz.8.229:6176]
Modules linked in:
irq event stamp: 404495
hardirqs last  enabled at (404494): [<ffff8000868e94fc>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (404494): [<ffff8000868e94fc>] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62
hardirqs last disabled at (404495): [<ffff8000868e550c>] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline]
hardirqs last disabled at (404495): [<ffff8000868e550c>] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522
softirqs last  enabled at (373932): [<ffff80008030ff18>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last  enabled at (373932): [<ffff80008030ff18>] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650
softirqs last disabled at (399707): [<ffff8000800204c0>] __do_softirq+0x14/0x20 kernel/softirq.c:656
CPU: 0 UID: 0 PID: 6176 Comm: syz.8.229 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __sanitizer_cov_trace_pc+0x4/0x5c kernel/kcov.c:210
lr : bond_select_queue+0xc0/0x12c drivers/net/bonding/bond_main.c:5416
sp : ffff80008eb27710
x29: ffff80008eb27720 x28: 1fffe00018d6f800 x27: dfff800000000000
x26: 1fffe00018d6f805 x25: ffff0000c6b7c028 x24: dfff800000000000
x23: ffff0000d5ecf5a0 x22: ffff800082b54914 x21: 0000000000000000
x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff
x17: ffff80008a791000 x16: 0000000000000003 x15: ffff80008a31ada0
x14: ffff80008a590e28 x13: 000000000000000e x12: 0000000000000000
x11: 0000000000000000 x10: 1fffe00018d6f805 x9 : 0000000000000302
x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800082b549a8
x2 : 0000000000000000 x1 : ffff0000d623ba80 x0 : 0000000000000000
Call trace:
 __sanitizer_cov_trace_pc+0x4/0x5c kernel/kcov.c:210 (P)
 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)
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] (P)
 _raw_spin_unlock_irqrestore+0x44/0x98 kernel/locking/spinlock.c:198 (P)
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 __wake_up_common_lock+0x5c/0x78 kernel/sched/wait.c:127
 __wake_up_sync_key+0x20/0x2c kernel/sched/wait.c:192
 __unix_dgram_recvmsg+0x2b0/0x85c net/unix/af_unix.c:2607
 unix_dgram_recvmsg+0xcc/0xe4 net/unix/af_unix.c:2681
 sock_recvmsg_nosec+0x94/0x130 net/socket.c:1126
 ____sys_recvmsg+0x4fc/0x608 net/socket.c:2902
 ___sys_recvmsg+0x16c/0x1f4 net/socket.c:2946
 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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6145 Comm: syz.6.227 Not tainted syzkaller #0 PREEMPT 
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 : ffff800096ae7820
x29: ffff800096ae78c0 x28: ffff0000f44b8010 x27: 1fffe0001b5be83b
x26: 1fffe0001e897002 x25: ffff0000f44b8000 x24: dfff800000000000
x23: ffff700012d5cf08 x22: ffff700012d5cf28 x21: ffff0000dadf41d8
x20: ffff0000dadf41e0 x19: ffff0000dadf41d0 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: ffff60001b5be83b 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
watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz.6.227:6145]
Modules linked in:
irq event stamp: 7955
hardirqs last  enabled at (7954): [<ffff8000868e94fc>] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline]
hardirqs last  enabled at (7954): [<ffff8000868e94fc>] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62
hardirqs last disabled at (7955): [<ffff8000868e550c>] __el1_irq arch/arm64/kernel/entry-common.c:506 [inline]
hardirqs last disabled at (7955): [<ffff8000868e550c>] el1_interrupt+0x28/0x60 arch/arm64/kernel/entry-common.c:522
softirqs last  enabled at (328): [<ffff800084bf9d0c>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (328): [<ffff800084bf9d0c>] release_sock+0x150/0x228 net/core/sock.c:3870
softirqs last disabled at (332): [<ffff800084c0e0f0>] spin_lock_bh include/linux/spinlock.h:348 [inline]
softirqs last disabled at (332): [<ffff800084c0e0f0>] lock_sock_nested+0x70/0x110 net/core/sock.c:3847