------------[ cut here ]------------
WARNING: CPU: 1 PID: 6155 at net/kcm/kcmsock.c:631 kcm_write_msgs+0x1413/0x15d0 net/kcm/kcmsock.c:631
Modules linked in:
CPU: 1 UID: 0 PID: 6155 Comm: syz-executor.0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:kcm_write_msgs+0x1413/0x15d0 net/kcm/kcmsock.c:631
Code: 24 68 49 89 06 45 31 e4 eb 68 e8 88 d3 d3 f7 e9 8a ed ff ff e8 7e d3 d3 f7 45 31 e4 45 31 ed e9 7a ed ff ff e8 6e d3 d3 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:ffffc900055276e0 EFLAGS: 00010293
RAX: ffffffff89e96452 RBX: 0000000000000180 RCX: ffff888032191e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900055278b0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900055277c0 R11: fffff52000aa4f05 R12: dffffc0000000000
R13: ffff8880407e1080 R14: ffff888049c35040 R15: 0000000000000000
FS:  00007fd13cdc66c0(0000) GS:ffff88812713b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020117000 CR3: 000000003d5e4000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kcm_sendmsg+0x24a9/0x2ad0 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:742
 sock_write_iter+0x27f/0x370 net/socket.c:1195
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5d5/0xb40 fs/read_write.c:686
 ksys_write+0x14b/0x260 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd13da4cb29
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:00007fd13cdc60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fd13db6bf80 RCX: 00007fd13da4cb29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fd13da9847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fd13db6bf80 R15: 00007ffd25dbc7f8
 </TASK>