syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.1.397:1550]
Modules linked in:
CPU: 0 PID: 1550 Comm: syz.1.397 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__rhashtable_lookup include/linux/rhashtable.h:-1 [inline]
RIP: 0010:rhashtable_lookup include/linux/rhashtable.h:638 [inline]
RIP: 0010:tipc_sk_lookup+0x1a8/0x600 net/tipc/socket.c:3001
Code: c1 e8 03 42 0f b6 04 20 84 c0 0f 85 cc 02 00 00 8b 1a 4c 8d 6a 04 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 d9 02 00 00 <44> 89 f0 41 81 c6 f3 be ad de 8d 8c 06 f3 be ad de 44 89 f0 c1 c0
RSP: 0018:ffffc90002a6e6e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000100 RCX: 1ffff11022122a1b
RDX: ffff888110922000 RSI: 00000000ddd696ab RDI: ffff888110922008
RBP: ffffc90002a6e7d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200054dcec R12: dffffc0000000000
R13: ffff888110922004 R14: 00000000bb23b2d9 R15: ffff8881109150de
FS:  00007f5e3b2c86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e3b2c7ff8 CR3: 0000000111f5b000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tipc_sk_rcv+0x382/0x2ca0 net/tipc/socket.c:2494
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 tipc_node_xmit_skb net/tipc/node.c:1768 [inline]
 tipc_node_distr_xmit+0x277/0x390 net/tipc/node.c:1783
 tipc_sk_rcv+0x1a3f/0x2ca0 net/tipc/socket.c:2503
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 tipc_sk_push_backlog+0x4d3/0x7b0 net/tipc/socket.c:1316
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1370 [inline]
 tipc_sk_proto_rcv+0x9c3/0x1570 net/tipc/socket.c:2158
 tipc_sk_filter_rcv+0x2dde/0x2fd0 net/tipc/socket.c:2354
 tipc_sk_enqueue net/tipc/socket.c:2447 [inline]
 tipc_sk_rcv+0x787/0x2ca0 net/tipc/socket.c:2499
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 tipc_node_xmit_skb net/tipc/node.c:1768 [inline]
 tipc_node_distr_xmit+0x277/0x390 net/tipc/node.c:1783
 tipc_sk_backlog_rcv+0x174/0x220 net/tipc/socket.c:2414
 sk_backlog_rcv include/net/sock.h:1090 [inline]
 __release_sock+0x17c/0x3f0 net/core/sock.c:2737
 release_sock net/core/sock.c:3290 [inline]
 sock_setsockopt+0x1a85/0x2470 net/core/sock.c:1381
 __sys_setsockopt+0x261/0x470 net/socket.c:2198
 __do_sys_setsockopt net/socket.c:2213 [inline]
 __se_sys_setsockopt net/socket.c:2210 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2210
 x64_sys_call+0x982/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:55
 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: 0033:0x7f5e3b486e59
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:00007f5e3b2c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f5e3b700090 RCX: 00007f5e3b486e59
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f5e3b51ce6f R08: 0000000000000004 R09: 0000000000000000
R10: 00002000000001c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e3b700128 R14: 00007f5e3b700090 R15: 00007ffe1d1f7b38
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1545 Comm: syz.1.397 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+0x105/0x150 arch/x86/kernel/kvm.c:918
Code: 21 d6 03 f4 eb 87 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 3d 21 d6 03 fb f4 <e9> 5e ff ff ff fb e9 58 ff ff ff e8 7b 8f 7c 03 89 f9 80 e1 07 38
RSP: 0018:ffffc90002a176c0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff88811da0a888 RCX: ffffffff814ff99c
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88811da0a888
RBP: ffffc90002a17750 R08: ffff88811da0a888 R09: 1ffff11023b41511
R10: dffffc0000000000 R11: ffffed1023b41512 R12: ffff88823ff524c0
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000542ed8
FS:  00007f5e3b2e96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcde2b44d58 CR3: 0000000111f5b000 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:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x605/0x9b0 kernel/locking/qspinlock.c:508
 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+0x5be/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+0x201/0x2d0 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: 0033:0x7f5e3b486e59
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:00007f5e3b2e9028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5e3b6fffa0 RCX: 00007f5e3b486e59
RDX: 0000000000048090 RSI: 0000200000000080 RDI: 0000000000000004
RBP: 00007f5e3b51ce6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5e3b700038 R14: 00007f5e3b6fffa0 R15: 00007ffe1d1f7b38
 </TASK>