watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.1.321:7541] Modules linked in: irq event stamp: 48991 hardirqs last enabled at (48990): [] kvm_wait arch/x86/kernel/kvm.c:1124 [inline] hardirqs last enabled at (48990): [] kvm_wait+0x122/0x160 arch/x86/kernel/kvm.c:1106 hardirqs last disabled at (48991): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (1058): [] tipc_sendstream+0x59/0x70 net/tipc/socket.c:1552 softirqs last disabled at (1070): [] spin_lock_bh include/linux/spinlock.h:353 [inline] softirqs last disabled at (1070): [] lock_sock_nested+0x5a/0xf0 net/core/sock.c:3925 CPU: 0 UID: 0 PID: 7541 Comm: syz.1.321 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: 07 a1 02 e9 6e d9 21 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 c3 3d 1d 00 fb f4 47 d9 21 f5 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffc900047df8e0 EFLAGS: 00000242 RAX: 000000000000bf5e RBX: 0000000000000003 RCX: 0000000000000004 RDX: 0000000000000201 RSI: ffffffff8e627b68 RDI: ffffffff8c836180 RBP: ffff88805ac96e90 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: 0000000000000003 R14: ffff8880b803da40 R15: 0000000000000000 FS: 00007f84135876c0(0000) GS:ffff888122472000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0c96fde2f8 CR3: 0000000070584000 CR4: 0000000000350ef0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] kvm_wait arch/x86/kernel/kvm.c:1124 [inline] kvm_wait+0x127/0x160 arch/x86/kernel/kvm.c:1106 pv_wait arch/x86/include/asm/paravirt-spinlock.h:88 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline] __pv_queued_spin_lock_slowpath+0x4b0/0xc00 kernel/locking/qspinlock.c:347 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:37 [inline] queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:71 [inline] queued_spin_lock include/asm-generic/qspinlock.h:115 [inline] do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116 spin_lock_bh include/linux/spinlock.h:353 [inline] lock_sock_nested+0x5a/0xf0 net/core/sock.c:3925 lock_sock include/net/sock.h:1717 [inline] tipc_sendstream+0x41/0x70 net/tipc/socket.c:1550 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg net/socket.c:818 [inline] ____sys_sendmsg+0xa99/0xc30 net/socket.c:2715 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2769 __sys_sendmsg+0x160/0x210 net/socket.c:2801 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f841279aeb9 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:00007f8413587028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8412a16090 RCX: 00007f841279aeb9 RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000004 RBP: 00007f8412808c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8412a16128 R14: 00007f8412a16090 R15: 00007fff5ccd5d48 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7539 Comm: syz.1.321 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline] RIP: 0010:lock_acquire kernel/locking/lockdep.c:5943 [inline] RIP: 0010:lock_acquire+0x1b2/0x380 kernel/locking/lockdep.c:5899 Code: ff 05 5a e6 d1 13 8b 88 a8 0b 00 00 4c 8b 14 24 8d 51 01 41 81 e2 00 02 00 00 44 89 e1 4c 89 14 24 4d 89 d1 89 90 a8 0b 00 00 <49> c1 e9 09 52 41 83 f1 01 89 da 6a 00 6a 00 6a 00 ff b4 24 90 00 RSP: 0018:ffffc90004d26c38 EFLAGS: 00000006 RAX: ffff88805adaddc0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 000000000a13a902 RSI: 0000000000000000 RDI: ffffc90004d27070 RBP: ffffc90004d27070 R08: 0000000000000001 R09: 0000000000000200 R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f84135a86c0(0000) GS:ffff888122572000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8ef5615fa4 CR3: 0000000070584000 CR4: 0000000000350ef0 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:182 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:205 spin_lock_bh include/linux/spinlock.h:353 [inline] tipc_skb_peek_port net/tipc/msg.h:1225 [inline] tipc_sk_rcv+0x15a/0x1c80 net/tipc/socket.c:2506 tipc_node_xmit+0x23e/0xf00 net/tipc/node.c:1708 tipc_node_xmit_skb net/tipc/node.c:1773 [inline] tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1788 tipc_sk_rcv+0xaab/0x1c80 net/tipc/socket.c:2516 tipc_node_xmit+0x23e/0xf00 net/tipc/node.c:1708 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+0x25fd/0x3320 net/tipc/socket.c:2357 tipc_sk_enqueue net/tipc/socket.c:2460 [inline] tipc_sk_rcv+0xe90/0x1c80 net/tipc/socket.c:2512 tipc_node_xmit+0x23e/0xf00 net/tipc/node.c:1708 tipc_node_xmit_skb net/tipc/node.c:1773 [inline] tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1788 tipc_sk_backlog_rcv+0x16f/0x1e0 net/tipc/socket.c:2427 sk_backlog_rcv include/net/sock.h:1194 [inline] __release_sock+0x39d/0x440 net/core/sock.c:3341 release_sock+0x1e5/0x280 net/core/sock.c:3938 sockopt_release_sock net/core/sock.c:1164 [inline] sk_setsockopt+0x46b/0x5fc0 net/core/sock.c:1689 do_sock_setsockopt+0x193/0x1d0 net/socket.c:2395 __sys_setsockopt+0x195/0x220 net/socket.c:2424 __do_sys_setsockopt net/socket.c:2430 [inline] __se_sys_setsockopt net/socket.c:2427 [inline] __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2427 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f841279aeb9 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:00007f84135a8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f8412a15fa0 RCX: 00007f841279aeb9 RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f8412808c1f R08: 0000000000000004 R09: 0000000000000000 R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8412a16038 R14: 00007f8412a15fa0 R15: 00007fff5ccd5d48