watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.7.1102:4467] Modules linked in: CPU: 0 PID: 4467 Comm: syz.7.1102 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] RIP: 0010:kvm_wait+0xf2/0x140 arch/x86/kernel/kvm.c:1064 Code: 96 13 04 f4 eb 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07 40 38 f0 75 10 66 90 0f 00 2d 30 96 13 04 fb f4 71 ff ff ff fb e9 6b ff ff ff e8 de 16 b9 03 89 f9 80 e1 07 38 RSP: 0018:ffffc90000ab7680 EFLAGS: 00000246 RAX: 0000000000000003 RBX: ffff88810e465e98 RCX: ffffffff84f48de2 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88810e465e98 RBP: ffffc90000ab7710 R08: dffffc0000000000 R09: ffffed1021c8cbd4 R10: ffffed1021c8cbd4 R11: 1ffff11021c8cbd3 R12: 1ffff1103ee00001 R13: ffff8881f7038cd4 R14: dffffc0000000000 R15: 1ffff92000156ed0 FS: 00007f5dbefd96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5dbefb8d58 CR3: 0000000123996000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000602 Call Trace: pv_wait arch/x86/include/asm/paravirt.h:603 [inline] pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline] __pv_queued_spin_lock_slowpath+0x690/0xc40 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock include/linux/spinlock.h:187 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0xd8/0xe0 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x92/0x280 net/core/sock.c:3512 lock_sock include/net/sock.h:1805 [inline] tipc_sendstream+0x47/0x70 net/tipc/socket.c:1549 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5a9/0x990 net/socket.c:2509 ___sys_sendmsg+0x21c/0x290 net/socket.c:2563 __sys_sendmsg net/socket.c:2592 [inline] __do_sys_sendmsg net/socket.c:2601 [inline] __se_sys_sendmsg net/socket.c:2599 [inline] __x64_sys_sendmsg+0x1f0/0x2c0 net/socket.c:2599 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5dbe18f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5dbefd9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5dbe3e6090 RCX: 00007f5dbe18f749 RDX: 0000000000008010 RSI: 0000200000000240 RDI: 0000000000000006 RBP: 00007f5dbe213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5dbe3e6128 R14: 00007f5dbe3e6090 R15: 00007ffc9a00ff88 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4469 Comm: syz.7.1102 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:tipc_sk_rcv+0x1b0b/0x2cc0 include/linux/refcount.h:-1 Code: 89 e7 e8 48 8a 14 ff eb 19 bf 01 00 00 00 89 de e8 2a b2 a2 fc 85 db 0f 8e 46 02 00 00 e8 fd ad a2 fc 4c 8b a4 24 d8 00 00 00 <48> 8b 84 24 f0 00 00 00 42 0f b6 04 28 84 c0 48 8b 54 24 60 0f 85 RSP: 0018:ffffc90000ac64c0 EFLAGS: 00000293 RAX: ffffffff84cd7a73 RBX: 0000000000000005 RCX: ffff88811c82e540 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001 RBP: ffffc90000ac6750 R08: dffffc0000000000 R09: ffffed1021c8cbd1 R10: ffffed1021c8cbd1 R11: 1ffff11021c8cbd0 R12: ffff88811fcb9180 R13: dffffc0000000000 R14: ffffc90000ac6940 R15: 00000000a14007e8 FS: 00007f5dbefb86c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5dbefb7f98 CR3: 0000000123996000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: tipc_node_xmit+0x257/0xd00 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1783 tipc_sk_rcv+0x1aa3/0x2cc0 net/tipc/socket.c:2501 tipc_node_xmit+0x257/0xd00 net/tipc/node.c:1703 tipc_sk_push_backlog+0x4dd/0x790 net/tipc/socket.c:1316 tipc_sk_conn_proto_rcv net/tipc/socket.c:1370 [inline] tipc_sk_proto_rcv+0x98d/0x1580 net/tipc/socket.c:2158 tipc_sk_filter_rcv+0x2a93/0x2c80 net/tipc/socket.c:2352 tipc_sk_enqueue net/tipc/socket.c:2445 [inline] tipc_sk_rcv+0x7d9/0x2cc0 net/tipc/socket.c:2497 tipc_node_xmit+0x257/0xd00 net/tipc/node.c:1703 tipc_node_xmit_skb net/tipc/node.c:1768 [inline] tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1783 tipc_sk_backlog_rcv+0x16f/0x1f0 net/tipc/socket.c:2412 sk_backlog_rcv include/net/sock.h:1137 [inline] __release_sock+0x154/0x380 net/core/sock.c:2950 release_sock+0x60/0x1c0 net/core/sock.c:3524 tipc_recvstream+0xd16/0xe80 net/tipc/socket.c:2105 ____sys_recvmsg+0x2a0/0x590 net/socket.c:-1 ___sys_recvmsg+0x1b2/0x510 net/socket.c:2770 __sys_recvmsg net/socket.c:2800 [inline] __do_sys_recvmsg net/socket.c:2810 [inline] __se_sys_recvmsg net/socket.c:2807 [inline] __x64_sys_recvmsg+0x1ed/0x2c0 net/socket.c:2807 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:48 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5dbe18f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5dbefb8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007f5dbe3e6180 RCX: 00007f5dbe18f749 RDX: 0000000000000000 RSI: 0000200000000900 RDI: 0000000000000005 RBP: 00007f5dbe213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5dbe3e6218 R14: 00007f5dbe3e6180 R15: 00007ffc9a00ff88