[LU-19902] UBSAN: array-index-out-of-bounds error for ldiskfs

• Type: Bug
• Resolution: Unresolved
• Priority: Major
• Affects Version/s: Lustre 2.18.0
• Environment: Ubuntu 24 running 6.8.90 kernel. Server side issue using ldiskfs.
• Severity: 3
• Assignee: WC Triage
• Reporter: James A Simmons

Description

UBSAN: array-index-out-of-bounds in /usr/src/lustre-2.17.50/ldiskfs/namei.c:2594:11
index 255 is out of range for type 'char [255]'
CPU: 0 PID: 318005 Comm: ll_ost_out00_00 Tainted: G        W  OE      6.8.0-90-generic #91-Ubuntu
Hardware name: HP HP Envy Laptop 17t-da000/8C67, BIOS F.07 03/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x76/0xa0
dump_stack+0x10/0x20
__ubsan_handle_out_of_bounds+0xc6/0x110
ldiskfs_insert_dentry+0x32f/0x380 [ldiskfs]
add_dirent_to_buf+0xd1/0x1e0 [ldiskfs]
ldiskfs_add_entry_locked+0x1b4/0xa50 [ldiskfs]
osd_ldiskfs_add_entry+0x3f/0x280 [osd_ldiskfs]
__osd_ea_add_rec+0x299/0x520 [osd_ldiskfs]
osd_index_ea_insert+0x5ce/0x1520 [osd_ldiskfs]
out_tx_index_insert_exec+0x125/0x6f0 [ptlrpc]
out_tx_end+0x1dc/0x630 [ptlrpc]
out_handle+0x17c4/0x2360 [ptlrpc]
? tgt_request_preprocess+0x1fb/0x1460 [ptlrpc]
tgt_request_handle+0xa2a/0x1fb0 [ptlrpc]
ptlrpc_main+0x1381/0x2c40 [ptlrpc]
? __pfx_ptlrpc_main+0x10/0x10 [ptlrpc]
kthread+0xef/0x120

Issue Links

• is related to: LU-18010 Lustre server on Ubuntu24.04