------------[ cut here ]------------ WARNING: CPU: 0 PID: 31285 at net/kcm/kcmsock.c:630 kcm_write_msgs+0x13b0/0x1530 net/kcm/kcmsock.c:630 Modules linked in: CPU: 0 PID: 31285 Comm: syz-executor.3 Not tainted 6.8.0-rc2-syzkaller-00226-g1ce2654d87e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:kcm_write_msgs+0x13b0/0x1530 net/kcm/kcmsock.c:630 Code: f7 48 8b 5c 24 28 48 89 df e8 ec 9e ff ff eb 48 e8 45 cc 03 f7 45 31 f6 45 31 ed eb b9 e8 38 cc 03 f7 eb 2f e8 31 cc 03 f7 90 <0f> 0b 90 eb 09 e8 26 cc 03 f7 90 0f 0b 90 41 bd ea ff ff ff eb 13 RSP: 0018:ffffc9000318f6c0 EFLAGS: 00010283 RAX: ffffffff8a8f9aff RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000c729000 RSI: 0000000000013cf0 RDI: 0000000000013cf1 RBP: ffffc9000318f8b0 R08: ffffffff8a8f8f6b R09: 0000000000000000 R10: ffffc9000318f7c0 R11: fffff52000631f05 R12: dffffc0000000000 R13: ffff888036387490 R14: ffff8880363873c0 R15: ffff88803638748c FS: 00007f37c64616c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3272a000 CR3: 00000000a96e8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kcm_sendmsg+0x21bf/0x27d0 net/kcm/kcmsock.c:905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 sock_write_iter+0x2dd/0x400 net/socket.c:1160 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa81/0xcb0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f37c567dda9 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:00007f37c64610c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f37c57ac120 RCX: 00007f37c567dda9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000b RBP: 00007f37c56ca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f37c57ac120 R15: 00007ffe1b294f68