------------[ cut here ]------------ WARNING: CPU: 0 PID: 6525 at net/kcm/kcmsock.c:631 kcm_write_msgs+0x87d/0x1720 net/kcm/kcmsock.c:631 Modules linked in: CPU: 0 UID: 0 PID: 6525 Comm: syz.2.24 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:kcm_write_msgs+0x87d/0x1720 net/kcm/kcmsock.c:631 Code: 07 48 c1 ea 03 0f b6 04 02 38 c8 7f 08 84 c0 0f 85 3c 0e 00 00 41 c6 47 34 01 4c 89 7c 24 20 e9 86 f9 ff ff e8 04 45 2a f7 90 <0f> 0b 90 41 bd ea ff ff ff e8 f5 44 2a f7 e8 f0 44 2a f7 48 8b 44 RSP: 0018:ffffc90003c6f8d0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888071d84800 RCX: ffffffff8a92edcc RDX: ffff888078190000 RSI: ffffffff8a92f3ac RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000088000 R14: ffff888070208580 R15: ffff888033efb280 FS: 00007f61a7e5a6c0(0000) GS:ffff8881249d6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020117000 CR3: 000000005a84f000 CR4: 00000000003526f0 Call Trace: kcm_sendmsg+0x2562/0x2ca0 net/kcm/kcmsock.c:907 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x566/0x610 net/socket.c:1195 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d3/0x11d0 fs/read_write.c:686 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f61a6f7ff19 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:00007f61a7e5a058 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f61a7145fa0 RCX: 00007f61a6f7ff19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f61a6ff3986 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f61a7145fa0 R15: 00007ffcc6fc32b8