------------[ cut here ]------------
WARNING: CPU: 1 PID: 12696 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x880/0x1750 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 1 UID: 0 PID: 12696 Comm: syz.7.1835 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kcm_write_msgs+0x880/0x1750 net/kcm/kcmsock.c:630
Code: 07 48 c1 ea 03 0f b6 04 02 38 c8 7f 08 84 c0 0f 85 64 0e 00 00 41 c6 46 34 01 4c 89 74 24 20 e9 84 f9 ff ff e8 a1 d6 46 f7 90 <0f> 0b 90 41 bd ea ff ff ff e8 92 d6 46 f7 e8 8d d6 46 f7 48 8b 44
RSP: 0018:ffffc9000b50f8f0 EFLAGS: 00010283
RAX: 0000000000007ffd RBX: ffff88805f978a40 RCX: ffffc9000c713000
RDX: 0000000000040000 RSI: ffffffff8a46a5df RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000088000 R14: ffff888028c7c780 R15: ffff8880340e0000
FS:  00007f48a0cff6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fad8864c62d CR3: 000000002783e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_sendmsg+0x2539/0x2be0 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg net/socket.c:744 [inline]
 sock_write_iter+0x4fe/0x5b0 net/socket.c:1165
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0x5ae/0x1150 fs/read_write.c:683
 ksys_write+0x1fa/0x260 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f489ff7e719
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:00007f48a0cff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48a0135f80 RCX: 00007f489ff7e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f489fff132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f48a0135f80 R15: 00007fffaa7ed558
 </TASK>