watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.8.48900:6931]
Modules linked in:
CPU: 0 PID: 6931 Comm: syz.8.48900 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0xce/0x130 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 33 1e b8 03 f4 eb 0e 0f 1f 44 00 00 0f 00 2d 24 1e b8 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:ffffc90000c476e0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff88813e27ca88 RCX: ffffffff814bebea
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88813e27ca88
RBP: ffffc90000c47790 R08: ffff88813e27ca88 R09: 1ffff11027c4f951
R10: dffffc0000000000 R11: ffffed1027c4f952 R12: 0000000000000246
R13: 1ffff11027c4f951 R14: dffffc0000000000 R15: 1ffff92000188ee0
FS:  00007f6c5f4676c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c5f425d58 CR3: 00000001473c2000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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:184 [inline]
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
 _raw_spin_lock_bh+0xe4/0xf0 kernel/locking/spinlock.c:175
 spin_lock_bh include/linux/spinlock.h:360 [inline]
 lock_sock_nested+0x90/0x2a0 net/core/sock.c:3125
 lock_sock include/net/sock.h:1697 [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+0x5b7/0x8f0 net/socket.c:2376
 ___sys_sendmsg+0x236/0x2e0 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+0x1f9/0x2c0 net/socket.c:2466
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6c60a0c819
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:00007f6c5f467028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6c60c85fa0 RCX: 00007f6c60a0c819
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000005
RBP: 00007f6c60aa2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c60c86038 R14: 00007f6c60c85fa0 R15: 00007ffcb363c508
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 6934 Comm: syz.8.48900 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:202 [inline]
RIP: 0010:atomic_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:707 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:82 [inline]
RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:184 [inline]
RIP: 0010:__raw_spin_lock_bh include/linux/spinlock_api_smp.h:136 [inline]
RIP: 0010:_raw_spin_lock_bh+0xa1/0xf0 kernel/locking/spinlock.c:175
Code: 00 00 00 48 89 df be 04 00 00 00 e8 39 7c 1c fd 4c 89 f7 be 04 00 00 00 e8 2c 7c 1c fd 8b 44 24 20 b9 01 00 00 00 f0 0f b1 0b <75> 33 43 c6 44 27 04 f8 48 c7 04 24 0e 36 e0 45 4b c7 04 27 00 00
RSP: 0018:ffffc90001f06920 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90001f06e34 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90001f06940
RBP: ffffc90001f069b0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520003e0d28 R12: dffffc0000000000
R13: ffff88813e27ca80 R14: ffffc90001f06940 R15: 1ffff920003e0d24
FS:  00007f6c5f4466c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c5f445ff8 CR3: 00000001473c2000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 spin_lock_bh include/linux/spinlock.h:360 [inline]
 tipc_skb_peek_port net/tipc/msg.h:1248 [inline]
 tipc_sk_rcv+0x230/0x1dc0 net/tipc/socket.c:2487
 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1674
 tipc_node_xmit_skb net/tipc/node.c:1739 [inline]
 tipc_node_distr_xmit+0x2a3/0x3b0 net/tipc/node.c:1754
 tipc_sk_rcv+0x18ed/0x1dc0 net/tipc/socket.c:2497
 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1674
 tipc_sk_push_backlog net/tipc/socket.c:1306 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2253 [inline]
 tipc_sk_filter_rcv+0x15e5/0x3910 net/tipc/socket.c:2362
 tipc_sk_enqueue net/tipc/socket.c:2442 [inline]
 tipc_sk_rcv+0x742/0x1dc0 net/tipc/socket.c:2493
 tipc_node_xmit+0x26c/0xd80 net/tipc/node.c:1674
 tipc_node_xmit_skb net/tipc/node.c:1739 [inline]
 tipc_node_distr_xmit+0x2a3/0x3b0 net/tipc/node.c:1754
 tipc_sk_backlog_rcv+0x17d/0x210 net/tipc/socket.c:2410
 sk_backlog_rcv include/net/sock.h:1071 [inline]
 __release_sock+0x146/0x360 net/core/sock.c:2589
 release_sock net/core/sock.c:3142 [inline]
 sock_setsockopt+0x1840/0x2680 net/core/sock.c:1257
 __sys_setsockopt+0x272/0x480 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: 0033:0x7f6c60a0c819
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:00007f6c5f446028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f6c60c86090 RCX: 00007f6c60a0c819
RDX: 0000000000000021 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007f6c60aa2c91 R08: 0000000000000004 R09: 0000000000000000
R10: 00002000000001c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c60c86128 R14: 00007f6c60c86090 R15: 00007ffcb363c508