[LTP] next-20250915: LTP chdir01 df01_sh stat04 tst_device.c:97: TBROK: Could not stat loop device 0

[Naresh Kamboju]

The following LTP chdir01 df01_sh and stat04 tests failed on the rock-pi-4b
qemu-arm64 on the Linux next-20250915 tag build.

First seen on next-20250915
Good: next-20250912
Bad: next-20250915

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

* rk3399-rock-pi-4b, ltp-smoke
* qemu-arm64, ltp-smoke
* qemu-arm64-compat, ltp-smoke
 - chdir01
  - df01_sh
  - stat04

Test regression: next-20250915: LTP chdir01 df01_sh stat04
tst_device.c:97: TBROK: Could not stat loop device 0

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

## Test log
<8>[   53.655971] <LAVA_SIGNAL_STARTTC chdir01>
tst_buffers.c:57: TINFO: Test is using guarded buffers
tst_tmpdir.c:316: TINFO: Using /tmp/LTP_chdm4pHJb as tmpdir (tmpfs filesystem)
tst_device.c:98: TINFO: Found free device 0 '/dev/loop0'
tst_test.c:1953: TINFO: LTP version: 20250530
tst_test.c:1956: TINFO: Tested kernel: 6.17.0-rc6-next-20250915 #1 SMP
PREEMPT @1757983656 aarch64
tst_kconfig.c:88: TINFO: Parsing kernel config '/proc/config.gz'
tst_kconfig.c:676: TINFO: CONFIG_TRACE_IRQFLAGS kernel option detected
which might slow the execution
tst_test.c:1774: TINFO: Overall timeout per run is 0h 28m 48s
tst_supported_fs_types.c:97: TINFO: Kernel supports ext2
tst_supported_fs_types.c:62: TINFO: mkfs.ext2 does exist
tst_supported_fs_types.c:97: TINFO: Kernel supports ext3
tst_supported_fs_types.c:62: TINFO: mkfs.ext3 does exist
tst_supported_fs_types.c:97: TINFO: Kernel supports ext4
tst_supported_fs_types.c:62: TINFO: mkfs.ext4 does exist
tst_supported_fs_types.c:128: TINFO: Filesystem xfs is not supported
tst_supported_fs_types.c:97: TINFO: Kernel supports btrfs
tst_supported_fs_types.c:62: TINFO: mkfs.btrfs does exist
tst_supported_fs_types.c:105: TINFO: Skipping bcachefs because of FUSE blacklist
tst_supported_fs_types.c:97: TINFO: Kernel supports vfat
tst_supported_fs_types.c:62: TINFO: mkfs.vfat does exist
tst_supported_fs_types.c:128: TINFO: Filesystem exfat is not supported
tst_supported_fs_types.c:132: TINFO: FUSE does support ntfs
tst_supported_fs_types.c:62: TINFO: mkfs.ntfs does exist
tst_supported_fs_types.c:97: TINFO: Kernel supports tmpfs
tst_supported_fs_types.c:49: TINFO: mkfs is not needed for tmpfs
tst_test.c:1888: TINFO: === Testing on ext2 ===
tst_device.c:391: TWARN: Failed to clear 512k block on /dev/loop0
tst_test.c:1217: TBROK: tst_clear_device() failed
Summary:
passed   0
failed   0
broken   1
skipped  0
warnings 1
tst_device.c:283: TWARN: open(/dev/loop0) failed: ENOENT (2)
<8>[   53.679564] <LAVA_SIGNAL_ENDTC chdir01>
<8>[   53.708246] <LAVA_SIGNAL_TESTCASE TEST_CASE_ID=chdir01 RESULT=fail>

<8>[   53.933883] <LAVA_SIGNAL_STARTTC stat04>
tst_buffers.c:57: TINFO: Test is using guarded buffers
tst_tmpdir.c:316: TINFO: Using /tmp/LTP_staPDxElt as tmpdir (tmpfs filesystem)
tst_device.c:97: TBROK: Could not stat loop device 0
Summary:
passed   0
failed   0
broken   1
skipped  0
warnings 0
<8>[   53.947889] <LAVA_SIGNAL_ENDTC stat04>
<8>[   53.974024] <LAVA_SIGNAL_TESTCASE TEST_CASE_ID=stat04 RESULT=fail>

<8>[   54.048075] <LAVA_SIGNAL_STARTTC df01_sh>
df01 1 TINFO: Running: df01.sh
df01 1 TINFO: Tested kernel: Linux
runner-j2nyww-sk-project-40964107-concurrent-0
6.17.0-rc6-next-20250915 #1 SMP PREEMPT @1757983656 aarch64 GNU/Linux
df01 1 TINFO: Using /tmp/LTP_df01.7pcwUXe1CN as tmpdir (tmpfs filesystem)
tst_device.c:97: TBROK: Could not stat loop device 0
df01 1 TBROK: Failed to acquire device
Summary:
passed   0
failed   0
broken   1
skipped  0
warnings 0
<8>[   54.060936] <LAVA_SIGNAL_ENDTC df01_sh>
<8>[   54.087630] <LAVA_SIGNAL_TESTCASE TEST_CASE_ID=df01_sh RESULT=fail>

## Source
* Kernel version: 6.17.0-rc6
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git describe: 6.17.0-rc6-next-20250915
* Git commit: c3067c2c38316c3ef013636c93daa285ee6aaa2e
* Architectures: arm64
* Toolchains: gcc-13 and gcc-8
* Kconfigs: lkftconfigs

## Build
* Test log: https://qa-reports.linaro.org/api/testruns/29896973/log_file/
* Test details:
https://regressions.linaro.org/lkft/linux-next-master/next-20250915/ltp-smoke/stat04/
* Test plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/32l4Vv9hKep2EcmS18u3NBtmoAm
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UF8KltAzu6kUpW3hXaYRWjZ/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/32l4UF8KltAzu6kUpW3hXaYRWjZ/config

--
Linaro LKFT