Message-ID: <CA+G9fYvk9HHE5UJ7cdJHTcY6P5JKnp+_e+sdC5U-ZQFTP9_hqQ@mail.gmail.com>
Date: Tue, 8 Jul 2025 18:28:20 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: LTP List <ltp@...ts.linux.it>, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, linux-fsdevel@...r.kernel.org, 
	linux-block <linux-block@...r.kernel.org>
Cc: Anders Roxell <anders.roxell@...aro.org>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Ben Copeland <benjamin.copeland@...aro.org>, 
	Petr Vorel <pvorel@...e.cz>, chrubis <chrubis@...e.cz>, rbm@...e.com, 
	Jens Axboe <axboe@...nel.dk>, willy@...radead.org
Subject: LTP: syscalls: TWARN ioctl(/dev/loop0, LOOP_SET_STATUS, test_dev.img)
 failed EOPNOTSUPP (95)

Regressions were observed while testing LTP syscalls cachestat01 and
other related tests on the next-20250702 Linux kernel across several devices.

The issue appears to be related to the inability to configure /dev/loop0
via the LOOP_SET_STATUS ioctl, which returned EOPNOTSUPP
(Operation not supported). This results in a TBROK condition,
causing the test to fail.

Test environments:
- arm64
- qemu-x86_64
- qemu-riscv

Regression Analysis:
- New regression? Yes
- Reproducibility? Yes

Regressions started from next-20250702 ( next-20250708)
Good: next-20250701
Bad: next-20250702

Test regression: Linux next-20250702 TWARN ioctl(/dev/loop0,
LOOP_SET_STATUS, test_dev.img) failed EOPNOTSUPP (95) TBROK Failed to
acquire device

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Test log
tst_buffers.c:57: TINFO: Test is using guarded buffers
tst_tmpdir.c:316: TINFO: Using /tmp/LTP_cacQ9AfS0 as tmpdir (tmpfs filesystem)
tst_device.c:98: TINFO: Found free device 0 '/dev/loop0'
tst_device.c:190: TWARN: ioctl(/dev/loop0, LOOP_SET_STATUS,
test_dev.img) failed: EOPNOTSUPP (95)
tst_device.c:362: TBROK: Failed to acquire device


## Source
* Kernel version: 6.16.0-rc4-next-20250702
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git sha: 50c8770a42faf8b1c7abe93e7c114337f580a97d
* Git describe: next-20250702
* Project: https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250704/testrun/29017637
* Architectures: arm64, x86_64, riscv64.
* Toolchains: gcc-13 and clang-20
* Kconfigs: defconfig+ltp

## Build
* Test log: https://qa-reports.linaro.org/api/testruns/28986655/log_file/
* Test details:
https://regressions.linaro.org/lkft/linux-next-master/next-20250702/ltp-syscalls/cachestat01/
* Test history:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250704/testrun/29017637/suite/ltp-syscalls/test/cachestat01/history/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2zJjY2EmRMul6P0UgjdOm4Ssiqh/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2zJjY2EmRMul6P0UgjdOm4Ssiqh/config

## List of tests
  - cachestat01
  - cachestat04
  - chdir01
  - chmod09
  - close_range01
  - copy_file_range01
  - copy_file_range02
  - creat09
  - fallocate04
  - fallocate05
  - fallocate06
  - fanotify01
  - fanotify05
  - fanotify06
  - fanotify10
  - fanotify13
  - fanotify14
  - fanotify15
  - fanotify16
  - fanotify17
  - fanotify18
  - fanotify19
  - fanotify20
  - fanotify21
  - fanotify22
  - fanotify23
  - fchmodat2_01
  - fdatasync03
  - fgetxattr01
  - fremovexattr01
  - fremovexattr02
  - fsetxattr01
  - fsmount01
  - fsmount02
  - fsopen01
  - fsopen02
  - fspick01
  - fspick02
  - fsskipig01
  - fsskipig02
  - fsskipig03
  - fstatfs01
  - fstatfs01_64
  - fsync01
  - fsync04
  - getdents01
  - getdents02
  - getxattr02
  - getxattr03
  - inotify03
  - ioctl04
  - ioctl05
  - ioctl06
  - ioctl_ficlone02
  - ioctl_fiemap01
  - ioctl_loop01
  - lchown03
  - linkat02
  - listmount01
  - listmount02
  - lremovexattr01
  - lstat03
  - lstat03_64
  - mkdir09
  - mknodat02
  - mmap16
  - mount01
  - mount02
  - mount03
  - mount04
  - mount05
  - mount06
  - mount07
  - mount_setattr01
  - move_mount01
  - move_mount02
  - msync04
  - open_tree01
  - open_tree02
  - prctl06
  - preadv03
  - preadv03_64
  - preadv203
  - preadv203_64
  - pwritev03
  - pwritev03_64
  - quotactl01
  - quotactl04
  - quotactl06
  - quotactl08
  - quotactl09
  - readahead02
  - readdir01
  - rename01
  - rename03
  - rename04
  - rename05
  - rename06
  - rename07
  - rename08
  - rename10
  - rename11
  - rename12
  - rename13
  - rename15
  - renameat01
  - setxattr01
  - stat04
  - stat04_64
  - statfs01
  - statfs01_64
  - statmount01
  - statmount02
  - statmount04
  - statmount05
  - statmount06
  - statmount07
  - statvfs01
  - statx06
  - statx08
  - statx10
  - statx11
  - statx12
  - sync01
  - syncfs01
  - umount01
  - umount02
  - umount03
  - umount2_01
  - umount2_02
  - unlink09
  - utime01
  - utime02
  - utime03
  - utime04
  - utime05
  - utimensat01
  - writev03

--
Linaro LKFT
https://lkft.linaro.org

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