syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.0.1650:11058]
Modules linked in:
irq event stamp: 387168659
hardirqs last  enabled at (387168658): [<ffffffff81c9043e>] __local_bh_enable_ip+0x9e/0x120 kernel/softirq.c:455
hardirqs last disabled at (387168659): [<ffffffff8b8fd05e>] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (50): [<ffffffff8b317bf1>] spin_unlock_bh include/linux/spinlock.h:395 [inline]
softirqs last  enabled at (50): [<ffffffff8b317bf1>] tipc_skb_peek_port net/tipc/msg.h:1235 [inline]
softirqs last  enabled at (50): [<ffffffff8b317bf1>] tipc_sk_rcv+0x2e1/0x1ca0 net/tipc/socket.c:2491
softirqs last disabled at (52): [<ffffffff8b317c28>] spin_trylock_bh include/linux/spinlock.h:413 [inline]
softirqs last disabled at (52): [<ffffffff8b317c28>] tipc_sk_rcv+0x318/0x1ca0 net/tipc/socket.c:2496
CPU: 0 UID: 0 PID: 11058 Comm: syz.0.1650 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__local_bh_enable_ip+0xa6/0x120 kernel/softirq.c:457
Code: 65 01 1d 0d 6c 45 12 65 66 f7 05 04 6c 45 12 ff ff 74 4d bf 01 00 00 00 e8 e7 56 0c 00 e8 62 d1 47 00 fb 65 8b 05 ea 6b 45 12 <85> c0 74 50 5b 5d e9 ba 3c 47 ff 65 8b 05 b4 af 45 12 85 c0 75 a0
RSP: 0018:ffffc90003766c80 EFLAGS: 00000202
RAX: 0000000000000201 RBX: 00000000fffffe00 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8de853a3 RDI: ffffffff8c1b1ea0
RBP: ffffffff8b317c28 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90003767030
R13: 0000000000000001 R14: 00000000eb98dc9c R15: dffffc0000000000
FS:  00007f01b26106c0(0000) GS:ffff888124339000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f01b260fff8 CR3: 0000000036cc4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __raw_spin_trylock_bh include/linux/spinlock_api_smp.h:207 [inline]
 _raw_spin_trylock_bh+0x35/0x70 kernel/locking/spinlock.c:146
 spin_trylock_bh include/linux/spinlock.h:413 [inline]
 tipc_sk_rcv+0x318/0x1ca0 net/tipc/socket.c:2496
 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781
 tipc_sk_rcv+0xaab/0x1ca0 net/tipc/socket.c:2501
 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
 tipc_sk_push_backlog+0x318/0xa00 net/tipc/socket.c:1312
 tipc_sk_conn_proto_rcv net/tipc/socket.c:1366 [inline]
 tipc_sk_proto_rcv net/tipc/socket.c:2156 [inline]
 tipc_sk_filter_rcv+0x26bd/0x3260 net/tipc/socket.c:2352
 tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
 tipc_sk_rcv+0xebb/0x1ca0 net/tipc/socket.c:2497
 tipc_node_xmit+0x23e/0xfb0 net/tipc/node.c:1701
 tipc_node_xmit_skb net/tipc/node.c:1766 [inline]
 tipc_node_distr_xmit+0x177/0x3c0 net/tipc/node.c:1781
 tipc_sk_backlog_rcv+0x16f/0x1e0 net/tipc/socket.c:2412
 sk_backlog_rcv include/net/sock.h:1185 [inline]
 __release_sock+0x3a2/0x440 net/core/sock.c:3213
 release_sock+0x5a/0x220 net/core/sock.c:3795
 sockopt_release_sock net/core/sock.c:1161 [inline]
 sk_setsockopt+0x467/0x5230 net/core/sock.c:1674
 do_sock_setsockopt+0x193/0x1d0 net/socket.c:2318
 __sys_setsockopt+0x195/0x220 net/socket.c:2347
 __do_sys_setsockopt net/socket.c:2353 [inline]
 __se_sys_setsockopt net/socket.c:2350 [inline]
 __x64_sys_setsockopt+0xbd/0x160 net/socket.c:2350
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01b179c819
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:00007f01b2610028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f01b1a16090 RCX: 00007f01b179c819
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007f01b1832c91 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000540 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01b1a16128 R14: 00007f01b1a16090 R15: 00007ffda87354b8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11057 Comm: syz.0.1650 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 88 83 02 e9 4e 6b 80 f5 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 a1 1b 00 fb f4 <e9> 27 6b 80 f5 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc900065978b8 EFLAGS: 00000242
RAX: 0000000000017cf8 RBX: 0000000000000003 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffffffff8de853a3 RDI: ffffffff8c1b1ea0
RBP: ffff88807e0e9ec8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003
R13: 0000000000000003 R14: ffff8880b853c240 R15: 0000000000000000
FS:  00007f01b26316c0(0000) GS:ffff888124439000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000036cc4000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
 kvm_wait arch/x86/kernel/kvm.c:1101 [inline]
 kvm_wait+0x124/0x160 arch/x86/kernel/kvm.c:1083
 pv_wait arch/x86/include/asm/paravirt-spinlock.h:83 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:466 [inline]
 __pv_queued_spin_lock_slowpath+0x4b0/0xc00 kernel/locking/qspinlock.c:325
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x1e0/0x260 kernel/locking/spinlock_debug.c:116
 spin_lock_bh include/linux/spinlock.h:347 [inline]
 lock_sock_nested+0x5f/0xf0 net/core/sock.c:3783
 lock_sock include/net/sock.h:1709 [inline]
 tipc_sendstream+0x41/0x70 net/tipc/socket.c:1545
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0x9e1/0xb70 net/socket.c:2592
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2646
 __sys_sendmsg+0x170/0x220 net/socket.c:2678
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01b179c819
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:00007f01b2631028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f01b1a15fa0 RCX: 00007f01b179c819
RDX: 0000000000000000 RSI: 0000200000000780 RDI: 0000000000000004
RBP: 00007f01b1832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01b1a16038 R14: 00007f01b1a15fa0 R15: 00007ffda87354b8
 </TASK>