Re: [PATCH v5] char: misc: add test cases

[kernel test robot <oliver.sang@intel.com>]

Hello,

kernel test robot noticed "sysfs:cannot_create_duplicate_filename" on:

commit: 127b049d35f10765f429aa2a97aa649ea9ac0b2f ("[PATCH v5] char: misc: add test cases")
url: https://github.com/intel-lab-lkp/linux/commits/Thadeu-Lima-de-Souza-Cascardo/char-misc-add-test-cases/20250613-013440
patch link: https://lore.kernel.org/all/20250612-misc-dynrange-v5-1-6f35048f7273@igalia.com/
patch subject: [PATCH v5] char: misc: add test cases

in testcase: kunit
version: 
with following parameters:

	group: group-00



config: x86_64-rhel-9.4-kunit
compiler: gcc-12
test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (Haswell) with 16G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202507091056.5d48c1a2-lkp@intel.com


[  112.908177][    T1]         ok 2 upper static range, bottom
[  112.914070][    T1]         ok 3 lower static range, bottom
[  112.920216][    T1]         ok 4 upper static range, top
[  112.925861][    T1]     # miscdev_test_duplicate_minor: pass:4 fail:0 skip:0 total:4
[  112.931240][    T1]     ok 5 miscdev_test_duplicate_minor
[  112.939321][ T2928] sysfs: cannot create duplicate filename '/devices/virtual/misc/misc1'
[  112.953103][ T2928] CPU: 0 UID: 0 PID: 2928 Comm: kunit_try_catch Tainted: G S               N  6.16.0-rc1-00001-g127b049d35f1 #1 PREEMPT(voluntary)
[  112.953110][ T2928] Tainted: [S]=CPU_OUT_OF_SPEC, [N]=TEST
[  112.953111][ T2928] Hardware name: Dell Inc. OptiPlex 9020/0DNKMN, BIOS A05 12/05/2013
[  112.953113][ T2928] Call Trace:
[  112.953115][ T2928]  <TASK>
[ 112.953117][ T2928] dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:123 (discriminator 1)) 
[ 112.953124][ T2928] sysfs_warn_dup (kbuild/src/consumer/fs/sysfs/dir.c:32 (discriminator 1)) 
[ 112.953129][ T2928] sysfs_create_dir_ns (kbuild/src/consumer/fs/sysfs/dir.c:63) 
[ 112.953133][ T2928] ? __pfx_sysfs_create_dir_ns (kbuild/src/consumer/fs/sysfs/dir.c:41) 


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250709/202507091056.5d48c1a2-lkp@intel.com


-- 
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https://github.com/intel/lkp-tests/wiki