[s390x] client/ioengine/http: time-based workload fails due to overflow counter

[tuan-hoang1]

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• [ x] I have read the GitHub issues section of REPORTING-BUGS.

Description of the bug:

Use FIO HTTP engine to continuously request at a S3 endpoint with following config

[global]
ioengine=http
name=standalone
direct=1
filename=/standalone/object
http_verbose=1
https=insecure
http_mode=s3
http_s3_key=<redacted>
http_s3_keyid=<redacted>
http_host=<redacted>
http_s3_region=<redacted>
group_reporting=1
continue_on_error=1

[create]
continue_on_error=1
rw=write
bs=4k
size=64k
time_based=1
runtime=5h

The FIO client on x86 does not have any problem, but s390x FIO client always fail with following error

      "total_err" : 1,
      "first_error" : 4294967295,

Full log: https://tpaste.us/9MqV.

To my understanding, FIO would probably hold a counter somewhere to count the total number of request for time based workload. That number might overflow and make a duplication of the runner of the counter (eventually leads to HTTP 409 error). Smells like an endian bug.

Environment: Fedora 39

fio version: 3.35

Reproduction steps above