------------[ cut here ]------------
WARNING: CPU: 1 PID: 12548 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x83e/0x16f0 net/kcm/kcmsock.c:630
Modules linked in:
CPU: 1 UID: 0 PID: 12548 Comm: syz.3.1978 Not tainted 6.11.0-rc4-syzkaller-00255-gd2bafcf224f3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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 49 0e 00 00 41 c6 46 34 01 4c 89 74 24 20 e9 c6 f9 ff ff e8 93 c7 54 f7 90 <0f> 0b 90 41 bd ea ff ff ff e8 84 c7 54 f7 e8 7f c7 54 f7 48 8b 44
RSP: 0018:ffffc900040af8f8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff88802fed8740 RCX: ffffc90031ad0000
RDX: 0000000000040000 RSI: ffffffff8a35b1dd RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000011000 R14: ffff88802541d900 R15: ffff888032de8580
FS:  00007fbab19b26c0(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008e38 CR3: 0000000012b6e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kcm_sendmsg+0x22ea/0x2950 net/kcm/kcmsock.c:907
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 sock_write_iter+0x50a/0x5c0 net/socket.c:1160
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6b6/0x1140 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+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbab0b79e79
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:00007fbab19b2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbab0d16130 RCX: 00007fbab0b79e79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007fbab0be793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fbab0d16130 R15: 00007ffc59596e88
 </TASK>