RBP: 00007fc4e0b67c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4e0d4b038 R14: 00007fc4e0d4afa0 R15: 00007ffc04387888
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.4.53:536]
Modules linked in:
CPU: 0 PID: 536 Comm: syz.4.53 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:tipc_sk_lookup+0x54d/0x5f0 net/tipc/socket.c:3004
Code: ed 49 bc 00 00 00 00 00 fc ff df eb 0f e8 7b 48 d1 fc eb 05 e8 74 48 d1 fc 45 31 ed e8 8c 26 bf fc 48 c7 44 24 60 0e 36 e0 45 <48> 8b 44 24 40 4a c7 04 20 00 00 00 00 65 48 8b 04 25 28 00 00 00
RSP: 0018:ffffc900010768e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888127448580 RCX: 0000000000080000
RDX: ffffc90003323000 RSI: 000000000007ffff RDI: ffff888118f14f00
RBP: ffffc900010769d0 R08: ffff888127448583 R09: 1ffff11024e890b0
R10: dffffc0000000000 R11: ffffed1024e890b1 R12: dffffc0000000000
R13: ffff888127448500 R14: 0000000000000004 R15: fffffffffffffc08
FS:  00007fc4df52c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000009000 CR3: 0000000132deb000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tipc_sk_rcv+0x3aa/0x2c20 net/tipc/socket.c:2492
 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1703
 tipc_node_xmit_skb+0xf7/0x150 net/tipc/node.c:1768
 tipc_sk_rcv+0x1d30/0x2c20 net/tipc/socket.c:2522
 tipc_node_xmit+0x26c/0xd80 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+0x154a/0x2cb0 net/tipc/socket.c:2364
 tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
 tipc_sk_rcv+0x794/0x2c20 net/tipc/socket.c:2497
 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1703
 tipc_node_xmit_skb net/tipc/node.c:1768 [inline]
 tipc_node_distr_xmit+0x2a3/0x3b0 net/tipc/node.c:1783
 tipc_sk_backlog_rcv+0x17d/0x210 net/tipc/socket.c:2412
 sk_backlog_rcv include/net/sock.h:1090 [inline]
 __release_sock+0x17c/0x3f0 net/core/sock.c:2737
 release_sock+0x60/0x1b0 net/core/sock.c:3290
 tipc_release+0xd23/0x1640 net/tipc/socket.c:652
 __sock_release net/socket.c:649 [inline]
 sock_close+0xe0/0x270 net/socket.c:1335
 __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
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/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: 0033:0x7fc4e0ad1819
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:00007fc4df52c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000203a0 RBX: 00007fc4e0d4afa0 RCX: 00007fc4e0ad1819
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: 0000000000000004
RBP: 00007fc4e0b67c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4e0d4b038 R14: 00007fc4e0d4afa0 R15: 00007ffc04387888
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 537 Comm: syz.4.53 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x527/0x9c0 kernel/locking/qspinlock.c:508
Code: 00 41 c6 45 00 00 48 8b 44 24 10 42 0f b6 04 38 84 c0 0f 85 1c 01 00 00 48 8b 44 24 08 c6 00 01 41 bd 00 80 ff ff eb 07 f3 90 <41> ff c5 74 47 43 0f b6 04 3e 84 c0 75 2b 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc90001087760 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff888127448588 RCX: ffffffff81500419
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff888127448588
RBP: ffffc90001087850 R08: ffff888127448588 R09: 1ffff11024e890b1
R10: dffffc0000000000 R11: ffffed1024e890b2 R12: 1ffff1103ee20001
R13: 00000000ffffe621 R14: 1ffff11024e890b1 R15: dffffc0000000000
FS:  00007fc4df50b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4df50aff8 CR3: 0000000132deb000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:188 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0xe4/0xf0 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:369 [inline]
 lock_sock_nested+0x95/0x2a0 net/core/sock.c:3278
 lock_sock include/net/sock.h:1743 [inline]
 tipc_sendstream+0x47/0x70 net/tipc/socket.c:1549
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489
 __sys_sendmsg net/socket.c:2518 [inline]
 __do_sys_sendmsg net/socket.c:2527 [inline]
 __se_sys_sendmsg net/socket.c:2525 [inline]
 __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525
 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc4e0ad1819
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:00007fc4df50b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc4e0d4b090 RCX: 00007fc4e0ad1819
RDX: 0000000000044040 RSI: 0000200000000400 RDI: 0000000000000004
RBP: 00007fc4e0b67c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc4e0d4b128 R14: 00007fc4e0d4b090 R15: 00007ffc04387888
 </TASK>