syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.4.1033:3456]
Modules linked in:
CPU: 0 PID: 3456 Comm: syz.4.1033 Not tainted 5.10.240-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:732 [inline]
RIP: 0010:tipc_sk_lookup+0x4ec/0x5f0 net/tipc/socket.c:2999
Code: b7 00 49 29 c5 74 67 49 8d 9d 80 00 00 00 48 89 df be 04 00 00 00 e8 33 8b 40 fd 41 be 01 00 00 00 f0 45 0f c1 b5 80 00 00 00 <31> ff 44 89 f6 e8 4a 9d 06 fd 45 85 f6 0f 84 80 00 00 00 bf fe ff
RSP: 0018:ffffc9000335e740 EFLAGS: 00000206
RAX: 0000000000000301 RBX: ffff888127b37280 RCX: ffffffff845d06bd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888127b37280
RBP: ffffc9000335e830 R08: dffffc0000000000 R09: ffffed1024f66e51
R10: ffffed1024f66e51 R11: 1ffff11024f66e50 R12: dffffc0000000000
R13: ffff888127b37200 R14: 0000000000000004 R15: fffffffffffffc18
FS:  00007f8af7e136c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8af7e12f98 CR3: 0000000119b95000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tipc_sk_rcv+0x3eb/0x1ef0 net/tipc/socket.c:2488
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_node_xmit_skb net/tipc/node.c:1739 [inline]
 tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1754
 tipc_sk_rcv+0x19b9/0x1ef0 net/tipc/socket.c:2497
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_sk_push_backlog+0x4dd/0x790 net/tipc/socket.c:1306
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1358 [inline]
 tipc_sk_proto_rcv+0x98d/0x1ac0 net/tipc/socket.c:2156
 tipc_sk_filter_rcv+0x30ac/0x3850 net/tipc/socket.c:2350
 tipc_sk_enqueue net/tipc/socket.c:2442 [inline]
 tipc_sk_rcv+0x7cc/0x1ef0 net/tipc/socket.c:2493
 tipc_node_xmit+0x256/0xcd0 net/tipc/node.c:1674
 tipc_node_xmit_skb net/tipc/node.c:1739 [inline]
 tipc_node_distr_xmit+0x292/0x390 net/tipc/node.c:1754
 tipc_sk_backlog_rcv+0x16f/0x1f0 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1052 [inline]
 __release_sock+0x146/0x360 net/core/sock.c:2583
 release_sock net/core/sock.c:3134 [inline]
 sock_setsockopt+0x125e/0x2350 net/core/sock.c:1257
 __sys_setsockopt+0x265/0x460 net/socket.c:2142
 __do_sys_setsockopt net/socket.c:2157 [inline]
 __se_sys_setsockopt net/socket.c:2154 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2154
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8af7fc3be9
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:00007f8af7e13038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f8af81eb090 RCX: 00007f8af7fc3be9
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f8af8046e19 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8af81eb128 R14: 00007f8af81eb090 R15: 00007ffca1f96ee8
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3453 Comm: syz.4.1033 Not tainted 5.10.240-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:kvm_wait+0xc2/0x120 arch/x86/kernel/kvm.c:926
Code: 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d ff 98 98 03 f4 eb 0e 0f 1f 44 00 00 0f 00 2d f0 98 98 03 fb f4 <4c> 89 64 24 18 ff 74 24 18 9d 48 c7 44 24 20 0e 36 e0 45 4b c7 04
RSP: 0018:ffffc900032ff6e0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff888127b37288 RCX: ffffffff814b22ca
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff888127b37288
RBP: ffffc900032ff790 R08: dffffc0000000000 R09: ffffed1024f66e52
R10: ffffed1024f66e52 R11: 1ffff11024f66e51 R12: 0000000000000246
R13: 1ffff11024f66e51 R14: dffffc0000000000 R15: 1ffff9200065fee0
FS:  00007f8af7e346c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000119b95000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x714/0xb70 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [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:183 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0xd8/0xe0 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:359 [inline]
 lock_sock_nested+0x92/0x290 net/core/sock.c:3117
 lock_sock include/net/sock.h:1648 [inline]
 tipc_sendstream+0x47/0x70 net/tipc/socket.c:1540
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2376
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2430
 __sys_sendmsg net/socket.c:2459 [inline]
 __do_sys_sendmsg net/socket.c:2468 [inline]
 __se_sys_sendmsg net/socket.c:2466 [inline]
 __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2466
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f8af7fc3be9
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:00007f8af7e34038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8af81eafa0 RCX: 00007f8af7fc3be9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000004
RBP: 00007f8af8046e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8af81eb038 R14: 00007f8af81eafa0 R15: 00007ffca1f96ee8