------------[ cut here ]------------
WARNING: CPU: 0 PID: 6393 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x887/0x1770 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 0 UID: 0 PID: 6393 Comm: syz-executor.5 Not tainted 6.15.0-syzkaller-g0ff41df1cb26 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kcm_write_msgs+0x887/0x1770 net/kcm/kcmsock.c:630
Code: 07 48 c1 ea 03 0f b6 04 02 38 c8 7f 08 84 c0 0f 85 80 0e 00 00 41 c6 47 34 01 4c 89 7c 24 20 e9 7c f9 ff ff e8 5a 6c 21 f7 90 <0f> 0b 90 41 bd ea ff ff ff e8 4b 6c 21 f7 e8 46 6c 21 f7 48 8b 44
RSP: 0018:ffffc9000af7f8e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88806c9a1ec0 RCX: ffffffff8a99d2fc
RDX: ffff888027703c00 RSI: ffffffff8a99d8e6 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000088000 R14: ffff888032fed080 R15: ffff8880120f5500
FS:  00007fcc941fe6c0(0000) GS:ffff8881249e0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020090000 CR3: 000000007a711000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 kcm_sendmsg+0x2576/0x2c60 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 sock_write_iter+0x4ff/0x5b0 net/socket.c:1131
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x5bd/0x1180 fs/read_write.c:684
 ksys_write+0x205/0x240 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcc94e7cda9
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:00007fcc941fe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fcc94fabf80 RCX: 00007fcc94e7cda9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007fcc94ec947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fcc94fabf80 R15: 00007ffebccc5448
 </TASK>