watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.0:6840] Modules linked in: irq event stamp: 5211 hardirqs last enabled at (5210): [] irqentry_exit+0xd8/0x108 kernel/entry/common.c:214 hardirqs last disabled at (5211): [] __enter_from_kernel_mode arch/arm64/kernel/entry-common.c:43 [inline] hardirqs last disabled at (5211): [] enter_from_kernel_mode+0x14/0x34 arch/arm64/kernel/entry-common.c:50 softirqs last enabled at (300): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (300): [] release_sock+0x14c/0x1ac net/core/sock.c:3735 softirqs last disabled at (306): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (306): [] lock_sock_nested+0x70/0x118 net/core/sock.c:3714 CPU: 0 UID: 0 PID: 6840 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 03400005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 lr : queued_spin_lock_slowpath+0x144/0xaec kernel/locking/qspinlock.c:197 sp : ffff8000a05e7600 x29: ffff8000a05e76a0 x28: 1fffe0001902a861 x27: 1fffe0001a64a002 x26: ffff0000d3250000 x25: dfff800000000000 x24: ffff7000140bcec4 x23: 0000000000000001 x22: ffff0000d3250010 x21: ffff0000c8154308 x20: ffff0000c8154310 x19: ffff0000c8154300 x18: 0000000000000000 x17: 0000000000000000 x16: ffff800080537d14 x15: 0000000000000001 x14: 1fffe0001902a860 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001902a861 x10: dfff800000000000 x9 : 0000000000000000 x8 : 0000000000000001 x7 : ffff8000892f4c84 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b0885f8 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000001 Call trace: __cmpwait_case_8 arch/arm64/include/asm/cmpxchg.h:229 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:257 [inline] (P) queued_spin_lock_slowpath+0x138/0xaec kernel/locking/qspinlock.c:197 (P) queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x2a8/0x2cc kernel/locking/spinlock_debug.c:116 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x70/0x118 net/core/sock.c:3714 lock_sock include/net/sock.h:1669 [inline] tipc_sendstream+0x50/0x84 net/tipc/socket.c:1545 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2614 ___sys_sendmsg+0x204/0x278 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2703 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6841 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x178/0x2e0 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x158/0x2e0 kernel/locking/lockdep.c:5870 sp : ffff8000a2a160c0 x29: ffff8000a2a16110 x28: 0000000000000000 x27: 0000000000000000 x26: ffff80008f7a6570 x25: 0000000000000000 x24: 0000000000000000 x23: 0000000000000002 x22: ffff80008fa49aa0 x21: ffff80008ab4aee0 x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff x17: ffff800093605000 x16: ffff80008b065ce0 x15: 0000000000000001 x14: 1ffff00014542cef x13: 0000000000000000 x12: 0000000000000000 x11: 0000000087f1bc96 x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : ffff80008ab4aee0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002 x2 : 0000000000000008 x1 : ffff80008f13ae05 x0 : 0000000000000001 Call trace: __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+0x178/0x2e0 kernel/locking/lockdep.c:5871 (P) rcu_lock_acquire+0x40/0x4c include/linux/rcupdate.h:331 rcu_read_lock include/linux/rcupdate.h:841 [inline] tipc_sk_lookup+0xb4/0x87c net/tipc/socket.c:2997 tipc_sk_rcv+0x2e4/0x2294 net/tipc/socket.c:2490 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701 tipc_node_xmit_skb net/tipc/node.c:1766 [inline] tipc_node_distr_xmit+0x248/0x33c net/tipc/node.c:1781 tipc_sk_rcv+0x1df0/0x2294 net/tipc/socket.c:2499 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701 tipc_sk_push_backlog+0x398/0x744 net/tipc/socket.c:1312 tipc_sk_conn_proto_rcv net/tipc/socket.c:1366 [inline] tipc_sk_proto_rcv+0x704/0x12ec net/tipc/socket.c:2156 tipc_sk_filter_rcv+0x2524/0x277c net/tipc/socket.c:2350 tipc_sk_enqueue net/tipc/socket.c:2443 [inline] tipc_sk_rcv+0x628/0x2294 net/tipc/socket.c:2495 tipc_node_xmit+0x18c/0xc9c net/tipc/node.c:1701 tipc_node_xmit_skb net/tipc/node.c:1766 [inline] tipc_node_distr_xmit+0x248/0x33c net/tipc/node.c:1781 tipc_sk_backlog_rcv+0x164/0x214 net/tipc/socket.c:2410 sk_backlog_rcv include/net/sock.h:1150 [inline] __release_sock+0x19c/0x39c net/core/sock.c:3172 release_sock+0x60/0x1ac net/core/sock.c:3726 sockopt_release_sock net/core/sock.c:1155 [inline] sk_setsockopt+0x2354/0x28ec net/core/sock.c:1668 sock_setsockopt+0x68/0x80 net/core/sock.c:1675 do_sock_setsockopt+0x19c/0x328 net/socket.c:2340 __sys_setsockopt net/socket.c:2369 [inline] __do_sys_setsockopt net/socket.c:2375 [inline] __se_sys_setsockopt net/socket.c:2372 [inline] __arm64_sys_setsockopt+0x170/0x1e0 net/socket.c:2372 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596