[LU-15380] Hang in osp_precreate_reserve() while setstriping (-C 200) on single OST

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: WC Triage
• Reporter: Arshad Hussain

Description

Hang in osp_precreate_reserve() while creating 2000+ overstripe. There is only one OST.

Steps to recreate

 

1. Prepare enviroment with just single ost. (single node will also do)
2. lfs setstripe -C 2000 /mnt/lustre/file0
<Hang>

 

 

Dmesg

06:23:00 centos79 kernel: Lustre: mdt00_001: service thread pid 2247 was inactive for 40.028 seconds. The thread might be hung, or it might only be slow and will resume later. Dumping the stack trace for debugging purposes:
06:23:00 centos79 kernel: Pid: 2247, comm: mdt00_001 3.10.0-1160.15.2.el7.x86_64 #1 SMP Wed Feb 3 15:06:38 UTC 2021
06:23:00 centos79 kernel: Call Trace:
06:23:00 centos79 kernel: [<0>] osp_precreate_reserve+0x490/0x9b0 [osp]
06:23:00 centos79 kernel: [<0>] osp_declare_create+0x1ac/0x660 [osp]
06:23:00 centos79 kernel: [<0>] lod_sub_declare_create+0xdf/0x210 [lod]
06:23:00 centos79 kernel: [<0>] lod_qos_declare_object_on+0xf3/0x420 [lod]
06:23:00 centos79 kernel: [<0>] lod_ost_alloc_rr.constprop.23+0xaad/0x1150 [lod]
06:23:00 centos79 kernel: [<0>] lod_qos_prep_create+0x1245/0x1a20 [lod]
06:23:00 centos79 kernel: [<0>] lod_prepare_create+0x230/0x320 [lod]
06:23:00 centos79 kernel: [<0>] lod_declare_striped_create+0x1fe/0x9e0 [lod]
06:23:00 centos79 kernel: [<0>] lod_declare_xattr_set+0x139/0x2020 [lod]
06:23:00 centos79 kernel: [<0>] mdd_create_data+0x532/0x760 [mdd]
06:23:00 centos79 kernel: [<0>] mdt_mfd_open+0xcb7/0xed0 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_finish_open+0x79b/0x930 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_open_by_fid_lock+0x704/0xb10 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_reint_open+0x783/0x2a80 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_reint_rec+0x8a/0x240 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_reint_internal+0x76c/0xb50 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_intent_open+0x93/0x480 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_intent_opc+0x1e0/0xc10 [mdt]
06:23:00 centos79 kernel: [<0>] mdt_intent_policy+0x1a1/0x360 [mdt]
06:23:00 centos79 kernel: [<0>] ldlm_lock_enqueue+0x3c5/0xb50 [ptlrpc]
06:23:00 centos79 kernel: [<0>] ldlm_handle_enqueue0+0xab6/0x16d0 [ptlrpc]
06:23:00 centos79 kernel: [<0>] tgt_enqueue+0x64/0x240 [ptlrpc]
06:23:00 centos79 kernel: [<0>] tgt_request_handle+0x823/0x1850 [ptlrpc]
06:23:00 centos79 kernel: [<0>] ptlrpc_server_handle_request+0x253/0xb10 [ptlrpc]
06:23:00 centos79 kernel: [<0>] ptlrpc_main+0xbf4/0x15e0 [ptlrpc]
06:23:00 centos79 kernel: [<0>] kthread+0xd1/0xe0
06:23:00 centos79 kernel: [<0>] ret_from_fork_nospec_begin+0xe/0x21
06:23:00 centos79 kernel: [<0>] 0xfffffffffffffffe

Issue Links

• is related to: LU-14918 too many ldiskfs transaction credits for llog when unlinking overstriped files