syzbot

RBP: 00007fc6e9edd320 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000003c0 R11: 0000000000000246 R12: 00007fc6e9eaa44c
R13: 00002000000026c0 R14: 0000200000009150 R15: 0000200000008fc0
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [syz-executor277:308]
Modules linked in:
CPU: 1 PID: 308 Comm: syz-executor277 Not tainted 5.15.185-syzkaller-00207-g32c443bd6d40 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__refcount_add include/linux/refcount.h:200 [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:747 [inline]
RIP: 0010:tipc_sk_lookup+0x51a/0x5f0 net/tipc/socket.c:3001
Code: f6 e8 5a 40 de fc 45 85 f6 0f 84 80 00 00 00 bf fe ff ff 7f 44 89 f6 e8 44 40 de fc 41 81 fe fe ff ff 7f 77 76 e8 86 3c de fc <eb> 23 e8 7f 3c de fc 45 31 ed 49 bc 00 00 00 00 00 fc ff df eb 0f
RSP: 0018:ffffc900009567e0 EFLAGS: 00000293
RAX: ffffffff848a6baa RBX: ffff888123357280 RCX: ffff888103f813c0
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000007ffffffe
RBP: ffffc900009568d0 R08: dffffc0000000000 R09: ffffed102466ae51
R10: ffffed102466ae51 R11: 1ffff1102466ae50 R12: dffffc0000000000
R13: ffff888123357200 R14: 0000000000000004 R15: fffffffffffffc08
FS:  00007fc6e9e126c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc615f2750 CR3: 00000001240d3000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tipc_sk_rcv+0x3fe/0x2c60 net/tipc/socket.c:2492
 tipc_node_xmit+0x256/0xce0 net/tipc/node.c:1703
 tipc_node_xmit_skb+0xe9/0x130 net/tipc/node.c:1768
 tipc_sk_rcv+0x1d5d/0x2c60 net/tipc/socket.c:2522
 tipc_node_xmit+0x256/0xce0 net/tipc/node.c:1703
 tipc_sk_push_backlog net/tipc/socket.c:1316 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2255 [inline]
 tipc_sk_filter_rcv+0x151b/0x2c40 net/tipc/socket.c:2364
 tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
 tipc_sk_rcv+0x7b7/0x2c60 net/tipc/socket.c:2497
 tipc_node_xmit+0x256/0xce0 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:1071 [inline]
 __release_sock+0x143/0x350 net/core/sock.c:2731
 release_sock+0x60/0x1b0 net/core/sock.c:3282
 tipc_release+0xd0b/0x1630 net/tipc/socket.c:652
 __sock_release net/socket.c:649 [inline]
 sock_close+0xe0/0x270 net/socket.c:1336
 __fput+0x20b/0x8b0 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 ptrace_notify+0x212/0x250 kernel/signal.c:2391
 ptrace_report_syscall include/linux/tracehook.h:66 [inline]
 tracehook_report_syscall_exit include/linux/tracehook.h:130 [inline]
 arch_syscall_exit_tracehook include/linux/entry-common.h:297 [inline]
 syscall_exit_work+0x87/0x160 kernel/entry/common.c:262
 syscall_exit_to_user_mode_prepare+0x1c/0x20 kernel/entry/common.c:289
 __syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
 syscall_exit_to_user_mode+0xd/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc6e9e51a69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc6e9e12218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fc6e9edd328 RCX: 00007fc6e9e51a69
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000003
RBP: 00007fc6e9edd320 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000003c0 R11: 0000000000000246 R12: 00007fc6e9eaa44c
R13: 00002000000026c0 R14: 0000200000009150 R15: 0000200000008fc0
 </TASK>