[LU-5559] ptlrpc_import_delay_req(): req wrong generation: req@ffff880583d69800 x1476486655962316/t0(0) o104->soaked-OST0004@192.168.1.124@o2ib1:15/16 lens 296/224 e 0 to 1 dl 1408342395 ref 1 fl Rpc:X/0/ffffffff rc 0/-1

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Affects Version/s: Lustre 2.7.0
• Severity: 3
• Assignee: Li Wei (Inactive)
• Reporter: Li Wei (Inactive)

Description

A client reconnected while the server was trying to (re)send it a BL AST:

Aug 17 23:13:15 lola-10 kernel: Lustre: 5600:0:(client.c:1926:ptlrpc_expire_one_request()) @@@ Request sent has timed out for slow reply: [se
nt 1408342388/real 1408342388]  req@ffff880583d69800 x1476486655962316/t0(0) o104->soaked-OST0004@192.168.1.124@o2ib1:15/16 lens 296/224 e 0
to 1 dl 1408342395 ref 1 fl Rpc:X/0/ffffffff rc 0/-1
Aug 17 23:13:15 lola-10 kernel: Lustre: soaked-OST0004: Client c1d7cd54-55f6-0482-0887-cf6de8216f19 (at 192.168.1.124@o2ib1) reconnecting
Aug 17 23:13:15 lola-10 kernel: LustreError: 5600:0:(client.c:1097:ptlrpc_import_delay_req()) @@@ req wrong generation:  req@ffff880583d69800
 x1476486655962316/t0(0) o104->soaked-OST0004@192.168.1.124@o2ib1:15/16 lens 296/224 e 0 to 1 dl 1408342395 ref 1 fl Rpc:X/0/ffffffff rc 0/-1
Aug 17 23:13:15 lola-10 kernel: LustreError: 5600:0:(ldlm_lockd.c:661:ldlm_handle_ast_error()) ### client (nid 192.168.1.124@o2ib1) returned
0 (rc -5) from blocking AST ns: filter-soaked-OST0004_UUID lock: ffff8805681c20c0/0x4a2dd95cee2a53fc lrc: 1/0,0 mode: --/PR res: [0x7b1a04:0x
0:0x0].0 rrc: 2 type: EXT [0->18446744073709551615] (req 0->18446744073709551615) flags: 0x64801000010020 nid: 192.168.1.124@o2ib1 remote: 0x
cc587d962f8bc36b expref: 11 pid: 6337 timeout: 4550787123 lvb_type: 1

Although the build has the AST resend patch, the "req wrong generation" error caused the BL AST not to be resent any further. It might not be a good idea to always destroy and recreate the reverse import upon a reconnection.

Issue Links

• duplicates: LU-5569 recreating a reverse import produce a various fails.