------------[ cut here ]------------
WARNING: net/kcm/kcmsock.c:631 at kcm_write_msgs+0x13be/0x1570 net/kcm/kcmsock.c:631, CPU#0: syz-executor/6836
Modules linked in:
CPU: 0 UID: 0 PID: 6836 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:kcm_write_msgs+0x13be/0x1570 net/kcm/kcmsock.c:631
Code: 24 60 49 89 06 45 31 e4 eb 68 e8 bd 0e 0c f7 e9 dc ed ff ff e8 b3 0e 0c f7 45 31 e4 45 31 ed e9 cc ed ff ff e8 a3 0e 0c f7 90 <0f> 0b 90 41 bc ea ff ff ff 48 bb 00 00 00 00 00 fc ff df eb 33 e8
RSP: 0018:ffffc90003def6e0 EFLAGS: 00010293
RAX: ffffffff8ab3cf4d RBX: 0000000000000180 RCX: ffff88802fe21e40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003def8b0 R08: ffffc90003def827 R09: 0000000000000000
R10: ffffc90003def7c0 R11: fffff520007bdf05 R12: dffffc0000000000
R13: ffff88807261ac00 R14: ffff88802ff19a00 R15: 0000000000000000
FS:  00007f01cb8c46c0(0000) GS:ffff8881259dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020226000 CR3: 00000000288f6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kcm_sendmsg+0x24a3/0x2ad0 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 sock_write_iter+0x279/0x360 net/socket.c:1182
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01caa7cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f01cb8c40c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f01cababf80 RCX: 00007f01caa7cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f01caac949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f01cababf80 R15: 00007ffc4846f008
 </TASK>