------------[ cut here ]------------
WARNING: CPU: 1 PID: 8890 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x83e/0x16f0 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 1 PID: 8890 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:kcm_write_msgs+0x83e/0x16f0 net/kcm/kcmsock.c:630
Code: 07 48 c1 ea 03 0f b6 04 02 38 c8 7f 08 84 c0 0f 85 47 0e 00 00 41 c6 46 34 01 4c 89 74 24 20 e9 c6 f9 ff ff e8 b3 45 7f f7 90 <0f> 0b 90 41 bd ea ff ff ff e8 a4 45 7f f7 e8 9f 45 7f f7 48 8b 44
RSP: 0018:ffffc90002eaf900 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88805ff47740 RCX: ffffc9001133f000
RDX: 0000000000040000 RSI: ffffffff8a0fefed RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000011000 R14: ffff88807cb09140 R15: ffff88805816c000
FS:  00007f9ec0dde6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556d49a938 CR3: 000000005df2c000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 kcm_sendmsg+0x22b9/0x2920 net/kcm/kcmsock.c:906
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x50d/0x5c0 net/socket.c:1160
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b9/0x1140 fs/read_write.c:590
 ksys_write+0x1f8/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ec127cee9
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:00007f9ec0dde0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9ec13ac050 RCX: 00007f9ec127cee9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f9ec12c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f9ec13ac050 R15: 00007ffc6855da58
 </TASK>