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[Bart Van Assche <bvanassche@xxxxxxx>]

Sorry, no idea.

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https://bugs.launchpad.net/bugs/1037546

Title:
  Using asynchronous I/O can cause data corruption or a kernel oops

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  How to reproduce:

  umount /mnt
  rm /dev/vdisk
  dd if=/dev/zero of=/dev/vdisk bs=1M count=1K
  mkfs.ext4 -F -O ^has_journal /dev/vdisk
  mount -o loop /dev/vdisk /mnt
  rm -f /mnt/test.*
  fio --verify=md5 -rw=randwrite --size=10m --bs=4k --loops=10000 --iodepth=64 --group_reporting --sync=1 --direct=1 --ioengine=libaio --directory=/mnt --name=test --thread --numjobs=16

  Result:
  - Sometimes fio complains about data corruption, e.g.
  verify: bad magic header 0, wanted acca at file /mnt/test.7.0 offset 10481664, length 0
  - Sometimes a kernel oops is triggered

  [ 2022.642479] BUG: unable to handle kernel NULL pointer dereference at 0000000000000291
  [ 2022.644043] IP: [<ffffffff811de96b>] ext4_end_io_dio+0x6b/0xc0
  [ 2022.645596] PGD 19e790067 PUD 19e0b6067 PMD 0
  [ 2022.647131] Oops: 0000 [#1] SMP
  [ 2022.648631] last sysfs file: /sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size
  [ 2022.650156] CPU 0
  [ 2022.650156] Modules linked in: ib_srp scsi_tgt netconsole configfs rdma_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ib_sa ib_uverbs ib_umad mlx4_ib ib_mad ib_core mlx4_en snd_hda_codec_atihdmi snd_hda_codec_analog fbcon tileblit font bitblit softcursor
   vga16fb vgastate radeon ttm drm_kms_helper snd_hda_intel snd_hda_codec asus_atk0110 snd_hwdep psmouse lp snd_pcm snd_timer snd soundcore serio_raw mlx4_core drm i2c_algo_bit snd_page_alloc intel_agp parport ohci1394 usbhid hid floppy sky2 skge ieee139
  4 pata_marvell ahci
  [ 2022.650156] Pid: 4241, comm: loop0 Not tainted 2.6.32-42-server #95-Ubuntu P5Q DELUXE
  [ 2022.650156] RIP: 0010:[<ffffffff811de96b>]  [<ffffffff811de96b>] ext4_end_io_dio+0x6b/0xc0
  [ 2022.650156] RSP: 0000:ffff88019e7f3db0  EFLAGS: 00010246
  [ 2022.650156] RAX: 0000000000000001 RBX: ffff88019e00a000 RCX: 0000000000000000
  [ 2022.650156] RDX: 0000000000001000 RSI: ffff8801959fd7d8 RDI: ffff88019e00a000
  [ 2022.650156] RBP: ffff88019e7f3dc0 R08: 0000000000000000 R09: 5600000000000000
  [ 2022.650156] R10: 0000000000000000 R11: 6db6db6db6db6db7 R12: ffff8801959fd7a8
  [ 2022.650156] R13: 0000000000001000 R14: ffff8801b72c0114 R15: ffff88019e7f3e80
  [ 2022.650156] FS:  0000000000000000(0000) GS:ffff880007200000(0000) knlGS:0000000000000000
  [ 2022.650156] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
  [ 2022.650156] CR2: 0000000000000291 CR3: 00000001b757f000 CR4: 00000000000406f0
  [ 2022.650156] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [ 2022.650156] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  [ 2022.650156] Process loop0 (pid: 4241, threadinfo ffff88019e7f2000, task ffff8801b561dc00)
  [ 2022.650156] Stack:
  [ 2022.650156]  0000000000000000 ffff8801b5fe6800 ffff88019e7f3df0 ffffffff8117939d
  [ 2022.650156] <0> ffff88019e7f3df0 ffff8801b5fe6800 ffff8801b5fe6b24 0000000000000000
  [ 2022.650156] <0> ffff88019e7f3e30 ffffffff811797a7 0000000000000286 ffff8801b72c0158
  [ 2022.650156] Call Trace:
  [ 2022.650156]  [<ffffffff8117939d>] dio_complete+0xbd/0xe0
  [ 2022.650156]  [<ffffffff811797a7>] dio_bio_end_aio+0x77/0xd0
  [ 2022.650156]  [<ffffffff8117429d>] bio_endio+0x1d/0x40
  [ 2022.650156]  [<ffffffff8137f5e0>] loop_thread+0xe0/0x270
  [ 2022.650156]  [<ffffffff81086470>] ? autoremove_wake_function+0x0/0x40
  [ 2022.650156]  [<ffffffff8137f500>] ? loop_thread+0x0/0x270
  [ 2022.650156]  [<ffffffff810860f6>] kthread+0x96/0xa0
  [ 2022.650156]  [<ffffffff810141aa>] child_rip+0xa/0x20
  [ 2022.650156]  [<ffffffff81086060>] ? kthread+0x0/0xa0
  [ 2022.650156]  [<ffffffff810141a0>] ? child_rip+0x0/0x20
  [ 2022.650156] Code: 00 00 00 00 00 48 8b 1c 24 4c 8b 64 24 08 c9 c3 49 8b 44 24 10 49 89 74 24 20 49 8d 74 24 30 49 89 54 24 28 48 8b 80 08 01 00 00 <48> 8b 80 90 02 00 00 48 8b b8 50 03 00 00 e8 32 3a ea ff 49 8b
  [ 2022.650156] RIP  [<ffffffff811de96b>] ext4_end_io_dio+0x6b/0xc0
  [ 2022.650156]  RSP <ffff88019e7f3db0>
  [ 2022.650156] CR2: 0000000000000291
  [ 2022.651252] BUG: unable to handle kernel
  [ 2022.719317] ---[ end trace b9996e8ae6b732db ]---
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', '/dev/snd/pcmC0D1p', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info: Error: [Errno 2] No such file or directory
  Card0.Amixer.values: Error: [Errno 2] No such file or directory
  Card1.Amixer.info: Error: [Errno 2] No such file or directory
  Card1.Amixer.values: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 10.04
  HibernationDevice: RESUME=UUID=ed6b25d1-0e71-46ec-aae4-502e9ce1cc58
  InstallationMedia: Ubuntu-Server 10.04.4 LTS "Lucid Lynx" - Release amd64 (20120214.2)
  MachineType: System manufacturer P5Q DELUXE
  Package: linux (not installed)
  ProcCmdLine: root=UUID=4c2434f2-aec2-4664-8df2-f2d2ad65b039 ro quiet
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.32-42.95-server 2.6.32.59+drm33.24
  Regression: No
  RelatedPackageVersions: linux-firmware 1.34.14
  Reproducible: Yes
  RfKill:
   
  Tags: lucid  needs-upstream-testing
  Uname: Linux 2.6.32-42-server x86_64
  UserGroups:
   
  dmi.bios.date: 07/10/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2301
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5Q DELUXE
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2301:bd07/10/2009:svnSystemmanufacturer:pnP5QDELUXE:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5QDELUXE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: P5Q DELUXE
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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