------------[ cut here ]------------
WARNING: CPU: 1 PID: 6779 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x13b9/0x1570 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 1 UID: 0 PID: 6779 Comm: syz.4.20 Not tainted 6.16.0-rc3-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kcm_write_msgs+0x13b9/0x1570 net/kcm/kcmsock.c:630
Code: 44 24 60 49 89 06 45 31 e4 eb 60 e8 71 2e 97 f7 e9 e0 ed ff ff e8 67 2e 97 f7 45 31 e4 45 31 ed e9 d0 ed ff ff e8 57 2e 97 f7 <0f> 0b 41 bc ea ff ff ff 48 bb 00 00 00 00 00 fc ff df eb 2d e8 3e
RSP: 0018:ffffc900041af700 EFLAGS: 00010293
RAX: ffffffff8a259f39 RBX: 0000000000000180 RCX: ffff888032305a00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900041af8d0 R08: ffffc900041af847 R09: 0000000000000000
R10: ffffc900041af7e0 R11: fffff52000835f09 R12: dffffc0000000000
R13: ffff88805d10a940 R14: ffff88807f91d380 R15: 0000000000000000
FS:  00007f4aa0c416c0(0000) GS:ffff888126c30000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005636074f1950 CR3: 000000007afd6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_sendmsg+0x24b1/0x2a70 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:727
 sock_write_iter+0x258/0x330 net/socket.c:1131
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x54b/0xa90 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+0x8a/0x300 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4a9fd8e929
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:00007f4aa0c41038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4a9ffb5fa0 RCX: 00007f4a9fd8e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00007f4a9fe10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4a9ffb5fa0 R15: 00007fffa4656d78
 </TASK>