linux-kernel - [syzbot] [kernel?] WARNING in static_key_dec_not

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Message-ID: <6872440c.a00a0220.26a83e.0078.GAE@google.com>
Date: Sat, 12 Jul 2025 04:16:28 -0700
From: syzbot <syzbot+0d84405982752c58ff64@...kaller.appspotmail.com>
To: ardb@...nel.org, jbaron@...mai.com, jpoimboe@...nel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, peterz@...radead.org, 
	rostedt@...dmis.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [kernel?] WARNING in static_key_dec_not_one

Hello,

syzbot found the following issue on:

HEAD commit:    1e3b66e32601 vsock: fix `vsock_proto` declaration
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=10f5f28c580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b29b1a0d7330d4a8
dashboard link: https://syzkaller.appspot.com/bug?extid=0d84405982752c58ff64
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/11faaf1afe22/disk-1e3b66e3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ba355ce28c50/vmlinux-1e3b66e3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/018f94fd1327/bzImage-1e3b66e3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0d84405982752c58ff64@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 12213 at kernel/jump_label.c:282 static_key_dec_not_one+0x198/0x1d0 kernel/jump_label.c:282
Modules linked in:
CPU: 0 UID: 0 PID: 12213 Comm: syz.1.1132 Not tainted 6.16.0-rc4-syzkaller-00114-g1e3b66e32601 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:static_key_dec_not_one+0x198/0x1d0 kernel/jump_label.c:282
Code: aa 10 48 3b 4c 24 60 75 45 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c6 f7 7b 09 cc e8 c0 53 ca ff eb b7 e8 b9 53 ca ff 90 <0f> 0b 90 b0 01 eb ad 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c e0 fe ff
RSP: 0018:ffffc900047c72a0 EFLAGS: 00010287
RAX: ffffffff81f60ae7 RBX: ffffffff99fd3080 RCX: 0000000000080000
RDX: ffffc9000bf4a000 RSI: 0000000000000216 RDI: 0000000000000217
RBP: ffffc900047c7358 R08: ffffffff99fd3083 R09: 1ffffffff33fa610
R10: dffffc0000000000 R11: fffffbfff33fa611 R12: ffffc900047c72e0
R13: 1ffff920008f8e58 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f23746486c0(0000) GS:ffff888125c1d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 0000000069232000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __static_key_slow_dec_cpuslocked+0x19/0x110 kernel/jump_label.c:297
 __static_key_slow_dec kernel/jump_label.c:321 [inline]
 static_key_slow_dec+0x45/0x90 kernel/jump_label.c:336
 ovs_dp_change+0x3c1/0x570 net/openvswitch/datapath.c:1776
 ovs_dp_cmd_set+0x1ec/0x3b0 net/openvswitch/datapath.c:2000
 genl_family_rcv_msg_doit+0x212/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2551
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x759/0x8e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 ____sys_sendmsg+0x505/0x830 net/socket.c:2566
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f237378e929
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:00007f2374648038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f23739b5fa0 RCX: 00007f237378e929
RDX: 000000000000c000 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f2373810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f23739b5fa0 R15: 00007ffe78621018
 </TASK>


---
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