watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.2.370:1537]
Modules linked in:
CPU: 0 PID: 1537 Comm: syz.2.370 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__refcount_add include/linux/refcount.h:198 [inline]
RIP: 0010:__refcount_inc include/linux/refcount.h:250 [inline]
RIP: 0010:refcount_inc include/linux/refcount.h:267 [inline]
RIP: 0010:sock_hold include/net/sock.h:791 [inline]
RIP: 0010:tipc_sk_lookup+0x506/0x620 net/tipc/socket.c:3003
Code: 49 29 c4 74 62 49 8d 9c 24 80 00 00 00 48 89 df be 04 00 00 00 e8 4a f3 e6 fc 41 be 01 00 00 00 f0 45 0f c1 b4 24 80 00 00 00 <31> ff 44 89 f6 e8 c0 71 a2 fc 45 85 f6 74 7d bf fe ff ff 7f 44 89
RSP: 0018:ffffc9000391e640 EFLAGS: 00000206
RAX: 0000000000000301 RBX: ffff888121b44080 RCX: ffffffff84cdbc46
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888121b44080
RBP: ffffc9000391e730 R08: dffffc0000000000 R09: ffffed1024368811
R10: ffffed1024368811 R11: 1ffff11024368810 R12: ffff888121b44000
R13: 00000000000003f0 R14: 0000000000000004 R15: ffff88811af650de
FS:  00007f9b819ac6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b819abf98 CR3: 000000011528e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tipc_sk_rcv+0x419/0x2cc0 net/tipc/socket.c:2492
 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 net/core/sock.c:3524 [inline]
 sockopt_release_sock+0x95/0x1f0 net/core/sock.c:1067
 sk_setsockopt+0x1355/0x2590 net/core/sock.c:-1
 sock_setsockopt+0x5a/0x70 net/core/sock.c:1552
 __sys_setsockopt+0x270/0x4e0 net/socket.c:2274
 __do_sys_setsockopt net/socket.c:2289 [inline]
 __se_sys_setsockopt net/socket.c:2286 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2286
 x64_sys_call+0x124/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 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: 0033:0x7f9b80b8cde9
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:00007f9b819ac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f9b80da6080 RCX: 00007f9b80b8cde9
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f9b80c0e2a0 R08: 0000000000000004 R09: 0000000000000000
R10: 0000400000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f9b80da6080 R15: 00007ffe55fd6de8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1536 Comm: syz.2.370 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 70 96 13 04 fb f4 <e9> 71 ff ff ff fb e9 6b ff ff ff e8 de 36 b9 03 89 f9 80 e1 07 38
RSP: 0018:ffffc900038d7680 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff888121b44098 RCX: ffffffff84f4ade2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff888121b44098
RBP: ffffc900038d7710 R08: dffffc0000000000 R09: ffffed1024368814
R10: ffffed1024368814 R11: 1ffff11024368813 R12: 1ffff1103ee20001
R13: ffff8881f7138cd4 R14: dffffc0000000000 R15: 1ffff9200071aed0
FS:  00007f9b819cd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000000000 CR3: 000000011528e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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: 0033:0x7f9b80b8cde9
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:00007f9b819cd038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9b80da5fa0 RCX: 00007f9b80b8cde9
RDX: 0000000000000000 RSI: 0000400000000500 RDI: 0000000000000004
RBP: 00007f9b80c0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9b80da5fa0 R15: 00007ffe55fd6de8
 </TASK>