------------[ cut here ]------------
WARNING: CPU: 0 PID: 6009 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x13be/0x1570 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 0 UID: 0 PID: 6009 Comm: syz-executor274 Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:kcm_write_msgs+0x13be/0x1570 net/kcm/kcmsock.c:630
Code: 24 60 49 89 06 45 31 e4 eb 68 e8 ed ec 38 f7 e9 dc ed ff ff e8 e3 ec 38 f7 45 31 e4 45 31 ed e9 cc ed ff ff e8 d3 ec 38 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:ffffc900044af720 EFLAGS: 00010293
RAX: ffffffff8a86d1fd RBX: 0000000000000180 RCX: ffff88802d2e5a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900044af8f0 R08: ffffc900044af867 R09: 0000000000000000
R10: ffffc900044af800 R11: fffff52000895f0d R12: dffffc0000000000
R13: ffff8880223e2c00 R14: ffff88802fbbc680 R15: 0000000000000000
FS:  00007f4aa087f6c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000802000 CR3: 0000000033aec000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_sendmsg+0x243b/0x29f0 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 sock_write_iter+0x258/0x330 net/socket.c:1131
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4aa08ec4e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 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:00007f4aa087f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4aa0979418 RCX: 00007f4aa08ec4e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f4aa0979410 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4aa0944ecc
R13: 00002000000001c0 R14: 0000200000000000 R15: 00002000000001c4
 </TASK>