watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.0.68:6590] Modules linked in: irq event stamp: 407959825 hardirqs last enabled at (407959824): [] __local_bh_enable_ip+0x9e/0x120 kernel/softirq.c:455 hardirqs last disabled at (407959825): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (58): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (58): [] tipc_skb_peek_port net/tipc/msg.h:1235 [inline] softirqs last enabled at (58): [] tipc_sk_rcv+0x2e1/0x1c80 net/tipc/socket.c:2496 softirqs last disabled at (60): [] spin_trylock_bh include/linux/spinlock.h:414 [inline] softirqs last disabled at (60): [] tipc_sk_rcv+0x318/0x1c80 net/tipc/socket.c:2501 CPU: 0 UID: 0 PID: 6590 Comm: syz.0.68 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:121 [inline] RIP: 0010:lock_release+0x5d/0x310 kernel/locking/lockdep.c:5881 Code: 87 07 02 00 00 48 0f a3 05 a0 51 36 0f 0f 82 02 02 00 00 44 8b 05 47 85 36 0f 45 85 c0 0f 84 48 01 00 00 65 8b 05 c3 6c 6f 12 <85> c0 0f 85 39 01 00 00 65 4c 8b 25 fb 25 6f 12 41 8b bc 24 9c 0b RSP: 0018:ffffc90002e96b60 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff8ebe6200 RCX: ffffffff8b3ea8cc RDX: 0000000000000000 RSI: ffffffff8c3e9500 RDI: ffffffff8e420920 RBP: ffffffff8b3ea81a R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888030e0d800 R13: 0000000000000001 R14: 00000000240a719c R15: dffffc0000000000 FS: 00007f80f2b016c0(0000) GS:ffff888123edd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80f2b00ff8 CR3: 000000007840d000 CR4: 0000000000350ef0 Call Trace: rcu_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] net_generic+0xef/0x2a0 include/net/netns/generic.h:48 tipc_sk_lookup+0xa2/0xa00 net/tipc/socket.c:3001 tipc_sk_rcv+0x2ee/0x1c80 net/tipc/socket.c:2497 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701 tipc_node_xmit_skb net/tipc/node.c:1766 [inline] tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781 tipc_sk_rcv+0xaab/0x1c80 net/tipc/socket.c:2506 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701 tipc_sk_push_backlog+0x318/0xa00 net/tipc/socket.c:1314 tipc_sk_conn_proto_rcv net/tipc/socket.c:1371 [inline] tipc_sk_proto_rcv net/tipc/socket.c:2161 [inline] tipc_sk_filter_rcv+0x248f/0x3250 net/tipc/socket.c:2357 tipc_sk_enqueue net/tipc/socket.c:2450 [inline] tipc_sk_rcv+0xe90/0x1c80 net/tipc/socket.c:2502 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701 tipc_node_xmit_skb net/tipc/node.c:1766 [inline] tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781 tipc_sk_backlog_rcv+0x16f/0x1e0 net/tipc/socket.c:2417 sk_backlog_rcv include/net/sock.h:1190 [inline] __release_sock+0x3a2/0x440 net/core/sock.c:3260 release_sock+0x1e5/0x280 net/core/sock.c:3859 sockopt_release_sock net/core/sock.c:1162 [inline] sk_setsockopt+0x46b/0x5d80 net/core/sock.c:1680 do_sock_setsockopt+0x193/0x1d0 net/socket.c:2364 __sys_setsockopt+0x195/0x220 net/socket.c:2393 __do_sys_setsockopt net/socket.c:2399 [inline] __se_sys_setsockopt net/socket.c:2396 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x860 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f80f1b9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f80f2b01028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f80f1e16090 RCX: 00007f80f1b9c819 RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f80f1c32c91 R08: 0000000000000004 R09: 0000000000000000 R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f80f1e16128 R14: 00007f80f1e16090 R15: 00007ffff6021578 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6589 Comm: syz.0.68 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: 86 a4 02 e9 6e b8 72 f5 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 03 fa 2d 00 fb f4 47 b8 72 f5 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc90002e378d8 EFLAGS: 00000246 RAX: 000000000001931e RBX: 0000000000000003 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffff8e168355 RDI: ffffffff8c3e9580 RBP: ffff8880799cca50 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000003 R14: ffff8880b853c5c0 R15: 0000000000000000 FS: 00007f80f2b226c0(0000) GS:ffff888123fdd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000007840d000 CR4: 0000000000350ef0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] kvm_wait arch/x86/kernel/kvm.c:1096 [inline] kvm_wait+0x124/0x160 arch/x86/kernel/kvm.c:1078 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline] __pv_queued_spin_lock_slowpath+0x4b0/0xc00 kernel/locking/qspinlock.c:325 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:348 [inline] lock_sock_nested+0x5f/0xf0 net/core/sock.c:3846 lock_sock include/net/sock.h:1713 [inline] tipc_sendstream+0x41/0x70 net/tipc/socket.c:1550 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738 __sys_sendmsg+0x160/0x210 net/socket.c:2770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x860 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f80f1b9c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f80f2b22028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f80f1e15fa0 RCX: 00007f80f1b9c819 RDX: 0000000000000000 RSI: 0000200000000780 RDI: 0000000000000004 RBP: 00007f80f1c32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f80f1e16038 R14: 00007f80f1e15fa0 R15: 00007ffff6021578