Issues

• fio 3.41 and 3.42 generate a significant population of nominally incompressible 8 KiB buffers that are independently compressible

  needreporterinfo
  axboe/fio#2157 · Filter by author Gerchco opened on Oct 4, 2026
  1

• sg ioengine's alignment check fails for 528 /4224

  triaged
  axboe/fio#2146 · Filter by author tjodork1960 opened on Sep 17, 2026
  1

• JSON group_reporting mixes first job name with last job's job options

  triaged
  axboe/fio#2132 · Filter by author chacabuco opened on Aug 13, 2026
  1

• do_io: uninitialized comp_time can reach check_min_rate (assert in rel_time_since / SIGABRT)

  axboe/fio#2128 · Filter by author Vladyyy opened on Aug 6, 2026
  1

• Feature Request: Separate output files for each format when multiple --output-format are specified

  enhancement
  axboe/fio#2126 · Filter by author pugsswangxs opened on Aug 6, 2026
  1

• Degrade read fio on large block at RDMA disk , strange behavior

  axboe/fio#2124 · Filter by author andrewalozol-alb opened on Aug 3, 2026

• Title: rw=trimwrite: termination can split a trim+write pair, leaving the last trimmed block deallocated

  axboe/fio#2122 · Filter by author Vladyyy opened on Jul 28, 2026
  1

• fio: X trim entries leaked? messages after trim verify workloads

  axboe/fio#2119 · Filter by author mjekdi opened on Jul 14, 2026
  1

• Potential Use-After-Free (UAF) in show_thread_status_json via failure path of json_object_add_value_object

  axboe/fio#2092 · Filter by author RigelYoung opened on May 21, 2026

• when testing rdma ioengine, why rw must be read for server and write for client

  enhancement
  axboe/fio#2080 · Filter by author hityupeng opened on Apr 17, 2026

• Option to forcibly exit fio when stuck

  enhancement
  axboe/fio#2065 · Filter by author jsemric opened on Mar 2, 2026

• Memory usage regression from FIO-3.36 to FIO-3.41

  needreporterinfo
  axboe/fio#2049 · Filter by author efeng2001 opened on Jan 28, 2026
  1

• Unexpected I/O behavior when ramp_time exceeds runtime

  axboe/fio#2041 · Filter by author adrian-tintas opened on Jan 21, 2026

• Clean up 32 vs 64-bit choice for random generators

  axboe/fio#2038 · Filter by author vincentkfu opened on Jan 15, 2026

• zbd: when performing multi-threaded append writes to a zoned block device, write operations can occasionally fail

  needreporterinfo
  axboe/fio#2032 · Filter by author ywang-wnlo opened on Dec 22, 2025
  3

• windows error 10014 not handled

  needsattentionpatcheswelcome
  axboe/fio#2027 · Filter by author FMCUSystemAdmins opened on Dec 5, 2025
  1

• Inflight_issued does not match

  axboe/fio#2024 · Filter by author efeng2001 opened on Dec 2, 2025
  2

• Add I/O timeout handling and reporting for hung (stuck) I/Os

  enhancementpatcheswelcome
  axboe/fio#2012 · Filter by author aqibahmad opened on Nov 7, 2025

• Fio's zipf distribution generator

  axboe/fio#1991 · Filter by author vincentkfu opened on Sep 29, 2025

• Building on armel and other old 32 bit architectures has undefined references to __atomic_store_8

  patcheswelcometriaged
  axboe/fio#1986 · Filter by author hoexter opened on Sep 16, 2025
  6

• Infinite 'msec_to_next_event' when executing fio on 4TB device on MacOS 12.7.4

  needreporterinfo
  axboe/fio#1985 · Filter by author yh-yong opened on Sep 16, 2025
  10

• --warnings-fatal swallows the error

  axboe/fio#1977 · Filter by author jlevon opened on Sep 2, 2025
  4

• Improve pattern verfiy %o when thread=1 or verify_async > 1

  enhancement
  axboe/fio#1973 · Filter by author vincentkfu opened on Aug 22, 2025

• FIO report fail when 112 * HDDs run FIO with 32jobs iodepth 32

  needsattention
  axboe/fio#1961 · Filter by author Hank-Zhao201209 opened on Aug 11, 2025
  26

• Issue with size and offset_increment Parameter Interaction

  triaged
  axboe/fio#1958 · Filter by author cosikng opened on Aug 5, 2025
  8