------------[ cut here ]------------
WARNING: CPU: 0 PID: 6405 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x1436/0x15d0 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 0 UID: 0 PID: 6405 Comm: syz-executor.0 Not tainted 6.12.0-syzkaller-05480-gfcc79e1714e8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:kcm_write_msgs+0x1436/0x15d0 net/kcm/kcmsock.c:630
Code: d0 d9 99 f6 4d 85 f6 74 60 e8 c6 d9 99 f6 48 8b 5c 24 30 48 89 df e8 59 9e ff ff eb 56 e8 b2 d9 99 f6 eb 4a e8 ab d9 99 f6 90 <0f> 0b 90 41 bd ea ff ff ff 49 bc 00 00 00 00 00 fc ff df eb 2f e8
RSP: 0018:ffffc90004cff700 EFLAGS: 00010293
RAX: ffffffff8afb2935 RBX: 0000000000000000 RCX: ffff888027553c00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004cff8f0 R08: ffffffff8afb1e87 R09: 0000000000000000
R10: ffffc90004cff800 R11: fffff5200099ff0d R12: 0000000000000140
R13: ffff88806f199e8c R14: ffff888075f5f442 R15: ffff888075f5f300
FS:  00007f3ac18986c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020227000 CR3: 000000007c996000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_sendmsg+0x23d8/0x2a50 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 sock_write_iter+0x2d7/0x3f0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3ac0a7c899
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:00007f3ac18980c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3ac0b9bf80 RCX: 00007f3ac0a7c899
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f3ac0ad8ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f3ac0b9bf80 R15: 00007ffdc5833388
 </TASK>