watchdog: BUG: soft lockup - CPU#0 stuck for 154s! [syz.5.1170:3861]
Modules linked in:
CPU: 0 PID: 3861 Comm: syz.5.1170 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x520/0x9b0 kernel/locking/qspinlock.c:508
Code: 8b 44 24 18 c6 00 00 48 8b 44 24 10 42 0f b6 04 28 84 c0 0f 85 1c 01 00 00 48 8d 43 01 c6 00 01 41 bc 00 80 ff ff eb 07 f3 90 <41> ff c4 74 47 43 0f b6 04 2e 84 c0 75 2b 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc90000cf7640 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff8881295ab788 RCX: ffffffff8150044c
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881295ab788
RBP: ffffc90000cf7730 R08: ffff8881295ab788 R09: 1ffff110252b56f1
R10: dffffc0000000000 R11: ffffed10252b56f2 R12: 00000000ffffa94b
R13: dffffc0000000000 R14: 1ffff110252b56f1 R15: ffff8881f7030001
FS:  00007f44bcd676c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff32986be0 CR3: 0000000113649000 CR4: 00000000003526b0
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+0x5be/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2490
 __sys_sendmmsg+0x2ba/0x4e0 net/socket.c:2576
 __do_sys_sendmmsg net/socket.c:2605 [inline]
 __se_sys_sendmmsg net/socket.c:2602 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2602
 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 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: 0033:0x7f44be30e0d9
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:00007f44bcd67028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f44be595fa0 RCX: 00007f44be30e0d9
RDX: 04000000000001cd RSI: 0000200000005280 RDI: 0000000000000004
RBP: 00007f44be3a5024 R08: 0000000000000000 R09: 0000000000000000
R10: 000000001008c811 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44be596038 R14: 00007f44be595fa0 R15: 00007fffc75b10a8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3864 Comm: syz.5.1170 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:_raw_spin_trylock_bh+0xef/0x150 kernel/locking/spinlock.c:146
Code: 00 00 ba 01 00 00 00 f0 0f b1 13 43 c6 44 25 04 f8 74 0f 4c 89 f7 be 01 02 00 00 e8 6b 3b 8b fc 31 c9 48 c7 04 24 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24
RSP: 0018:ffffc90000c16960 EFLAGS: 00000246
RAX: 0000000000000201 RBX: ffff8881295ab788 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000201 RDI: 00000000ffffffff
RBP: ffffc90000c169f0 R08: ffff8881295ab78b R09: 1ffff110252b56f1
R10: dffffc0000000000 R11: ffffed10252b56f2 R12: dffffc0000000000
R13: 1ffff92000182d2c R14: ffffffff8498137c R15: 00000000d99b0fc8
FS:  00007f44bcd466c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000113649000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 spin_trylock_bh include/linux/spinlock.h:424 [inline]
 tipc_sk_rcv+0x3ac/0x2ca0 net/tipc/socket.c:2498
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 tipc_node_xmit_skb+0xf7/0x150 net/tipc/node.c:1768
 tipc_sk_rcv+0x1d9d/0x2ca0 net/tipc/socket.c:2524
 tipc_node_xmit+0x36f/0xd80 net/tipc/node.c:1703
 tipc_sk_push_backlog net/tipc/socket.c:1316 [inline]
 tipc_sk_filter_connect net/tipc/socket.c:2257 [inline]
 tipc_sk_filter_rcv+0x1993/0x2fd0 net/tipc/socket.c:2366
 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+0x60/0x1b0 net/core/sock.c:3290
 tipc_release+0xcef/0x1610 net/tipc/socket.c:652
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1336
 __fput+0x22b/0x900 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: 0033:0x7f44be30e0d9
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:00007f44bcd46028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f44be596090 RCX: 00007f44be30e0d9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007f44bcd46090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f44be596128 R14: 00007f44be596090 R15: 00007fffc75b10a8
 </TASK>