[LU-14448] lod_get_default_lov_striping() may crash for uninitialized .llc_pool

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

MDS crashed with following call trace.

[7329320.534103] BUG: unable to handle kernel paging request at ffffffff00000000
[7329320.536059] IP: [<ffffffff9e38bc30>] strlen+0x0/0x30
[7329320.539170] Oops: 0000 [#1] SMP
[7329320.562981] CPU: 17 PID: 26305 Comm: mdt08_003 3.10.0-1062.18.1.el7_lustre.ddn4.x86_64 #1
[7329320.568909] task: ffff8b18afa51070 ti: ffff8b185ec8c000 task.ti: ffff8b185ec8c000
[7329320.570845] RIP: 0010:[<ffffffff9e38bc30>] [<ffffffff9e38bc30>] strlen+0x0/0x30
[7329320.594786] Call Trace:
[7329320.601593] [<ffffffffc17a99d6>] lod_ah_init+0x326/0x1010 [lod]
[7329320.603380] [<ffffffffc182f118>] mdd_object_make_hint+0x1c8/0x2c0 [mdd]
[7329320.607001] [<ffffffffc1818ea0>] mdd_create+0x790/0x14a0 [mdd]
[7329320.608632] [<ffffffffc16a5bad>] mdt_create+0xc6d/0x1300 [mdt]
[7329320.612190] [<ffffffffc16a63ab>] mdt_reint_create+0x16b/0x360 [mdt]
[7329320.613825] [<ffffffffc16a90c3>] mdt_reint_rec+0x83/0x210 [mdt]
[7329320.615513] [<ffffffffc1685303>] mdt_reint_internal+0x6e3/0xaf0 [mdt]
[7329320.617373] [<ffffffffc1691007>] mdt_reint+0x67/0x140 [mdt]
[7329320.619028] [<ffffffffc100fe0a>] tgt_request_handle+0xada/0x1570 [ptlrpc]
[7329320.624423] [<ffffffffc0fb27cb>] ptlrpc_server_handle_request+0x24b/0xab0 [ptlrpc]
[7329320.629393] [<ffffffffc0fb6134>] ptlrpc_main+0xb34/0x1470 [ptlrpc]
[7329320.634284] [<ffffffff9e0c6321>] kthread+0xd1/0xe0

Issue Links

• is related to: LU-7357 Add layout lock for striped directories.