[LU-12020] LustreError: 32657:0:(mdc_lib.c:137:mdc_pack_name()) ASSERTION( lu_name_is_valid_2(buf, cpy_len) ) failed:

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.1
• Severity: 3
• Assignee: Wang Shilong (Inactive)
• Reporter: Wang Shilong (Inactive)

Description

We hit a client crash with 2.7.x series client vs 2.5.x Server.

Feb 22 08:18:27 nb-0369 kernel: [6707384.065071] LustreError: 32657:0:(mdc_lib.c:137:mdc_pack_name()) ASSERTION( lu_name_is_valid_2(buf, cpy_len) ) failed:
Feb 22 08:18:27 nb-0369 kernel: [6707384.079827] LustreError: 32657:0:(mdc_lib.c:137:mdc_pack_name()) LBUG
Feb 22 08:18:27 nb-0369 kernel: [6707384.089644] Pid: 32657, comm: gmx
Feb 22 08:18:27 nb-0369 kernel: [6707384.095804]
Feb 22 08:18:27 nb-0369 kernel: [6707384.095804] Call Trace:
Feb 22 08:18:27 nb-0369 kernel: [6707384.105031]  [<ffffffffc0c1480e>] libcfs_call_trace+0x4e/0x60 [libcfs]
Feb 22 08:18:27 nb-0369 kernel: [6707384.114814]  [<ffffffffc0c14dcc>] lbug_with_loc+0x4c/0xc0 [libcfs]
Feb 22 08:18:27 nb-0369 kernel: [6707384.124180]  [<ffffffffc0e43ce2>] mdc_pack_name+0xd2/0x1c0 [mdc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.133261]  [<ffffffffc0e448ab>] mdc_open_pack+0x20b/0x2a0 [mdc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.142424]  [<ffffffffc0e4802e>] mdc_enqueue+0x7de/0x1920 [mdc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.151508]  [<ffffffff810bdc4b>] ? __wake_up_common+0x5b/0x90
Feb 22 08:18:27 nb-0369 kernel: [6707384.160820]  [<ffffffffc0e495bb>] mdc_intent_lock+0x25b/0x510 [mdc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.170151]  [<ffffffffc084de39>] ? fld_client_lookup+0x79/0x440 [fld]
Feb 22 08:18:27 nb-0369 kernel: [6707384.179781]  [<ffffffffc11611b0>] ? ll_md_blocking_ast+0x0/0x7f0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.189672]  [<ffffffffc0cf0ef0>] ? ldlm_completion_ast+0x0/0x910 [ptlrpc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.199603]  [<ffffffffc1079525>] lmv_intent_lock+0x5e5/0x1bb0 [lmv]
Feb 22 08:18:27 nb-0369 kernel: [6707384.208980]  [<ffffffffc0d2cb06>] ? ptlrpc_update_next_ping+0x46/0xa0 [ptlrpc]
Feb 22 08:18:27 nb-0369 kernel: [6707384.219272]  [<ffffffff81118892>] ? from_kgid+0x12/0x20
Feb 22 08:18:27 nb-0369 kernel: [6707384.227324]  [<ffffffffc1161d87>] ? ll_i2suppgid+0x37/0x40 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.236497]  [<ffffffffc1161dc3>] ? ll_i2gids+0x33/0xb0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.245302]  [<ffffffff81118892>] ? from_kgid+0x12/0x20
Feb 22 08:18:27 nb-0369 kernel: [6707384.253236]  [<ffffffffc1149ba2>] ? ll_prep_md_op_data+0x222/0x570 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.263088]  [<ffffffffc11611b0>] ? ll_md_blocking_ast+0x0/0x7f0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.272721]  [<ffffffffc112d47e>] ll_intent_file_open.isra.49+0x16e/0xfb0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.283178]  [<ffffffff811e4092>] ? kmem_cache_alloc+0x1c2/0x1f0
Feb 22 08:18:27 nb-0369 kernel: [6707384.291865]  [<ffffffffc112e523>] ll_file_open+0x263/0xea0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.300814]  [<ffffffff81202f8a>] do_dentry_open+0x1aa/0x2e0
Feb 22 08:18:27 nb-0369 kernel: [6707384.309110]  [<ffffffff812b7802>] ? security_inode_permission+0x22/0x30
Feb 22 08:18:27 nb-0369 kernel: [6707384.318479]  [<ffffffffc112e2c0>] ? ll_file_open+0x0/0xea0 [lustre]
Feb 22 08:18:27 nb-0369 kernel: [6707384.327407]  [<ffffffff8120315a>] vfs_open+0x5a/0xb0
Feb 22 08:18:27 nb-0369 kernel: [6707384.334815]  [<ffffffff81210fc8>] ? may_open+0x68/0x110
Feb 22 08:18:27 nb-0369 kernel: [6707384.342485]  [<ffffffff812144bd>] do_last+0x1ed/0x12c0

The problem is we are trying to access dentry name directly
and pass it down without holding @d_lock.

Issue Links

• is related to: LU-12169 Assertion on mdc_pack_name