Re: [PATCH] driver core: Add log when devtmpfs create node failed

[kernel test robot]

Hello,

kernel test robot noticed "sysfs: cannot create duplicate filename '/devices/virtual/misc/btrfs-control'" on:

commit: 691a646007c85103cbd339985b08bd336230f611 ("[PATCH] driver core: Add log when devtmpfs create node failed")
url: https://github.com/intel-lab-lkp/linux/commits/Xingui-Yang/driver-core-Add-log-when-devtmpfs-create-node-failed/20240522-194825
base: https://git.kernel.org/cgit/linux/kernel/git/gregkh/driver-core.git 880a746fa3ea5916a012fa320fdfbcd3f331bea3
patch link: https://lore.kernel.org/all/20240522114346.42951-1-yangxingui@xxxxxxxxxx/
patch subject: [PATCH] driver core: Add log when devtmpfs create node failed

in testcase: xfstests
version: xfstests-x86_64-98379713-1_20240527
with following parameters:

	disk: 4HDD
	fs: btrfs
	test: generic-group-16



compiler: gcc-13
test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (Skylake) with 28G 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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202405291031.54c11515-oliver.sang@xxxxxxxxx



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240529/202405291031.54c11515-oliver.sang@xxxxxxxxx



[   40.509648][ T1244] sysfs: cannot create duplicate filename '/devices/virtual/misc/btrfs-control'
[   40.518489][ T1244] CPU: 0 PID: 1244 Comm: modprobe Not tainted 6.9.0-rc5-00014-g691a646007c8 #1
[   40.527223][ T1244] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.2.8 01/26/2016
[   40.535263][ T1244] Call Trace:
[   40.538384][ T1244]  <TASK>
[   40.541162][ T1244]  dump_stack_lvl+0x53/0x70
[   40.545496][ T1244]  sysfs_warn_dup+0x75/0x90
[   40.549830][ T1244]  sysfs_create_dir_ns+0x208/0x280
[   40.554766][ T1244]  ? __pfx_sysfs_create_dir_ns+0x10/0x10
[   40.560221][ T1244]  ? _raw_spin_lock+0x85/0xe0
[   40.564727][ T1244]  kobject_add_internal+0x272/0x890
[   40.569752][ T1244]  kobject_add+0x13b/0x200
[   40.573999][ T1244]  ? __pfx_kobject_add+0x10/0x10
[   40.578762][ T1244]  ? __pfx_mutex_unlock+0x10/0x10
[   40.583611][ T1244]  ? kobject_get+0x50/0xe0
[   40.587856][ T1244]  ? kobject_put+0x50/0xd0
[   40.592101][ T1244]  device_add+0x218/0x1220
[   40.596348][ T1244]  ? __pfx_device_add+0x10/0x10
[   40.601028][ T1244]  device_create_groups_vargs+0x1be/0x230
[   40.606570][ T1244]  device_create_with_groups+0xab/0xe0
[   40.611854][ T1244]  ? __pfx_device_create_with_groups+0x10/0x10
[   40.617828][ T1244]  ? mutex_lock+0xa2/0xf0
[   40.621987][ T1244]  ? __pfx_mutex_lock+0x10/0x10
[   40.626664][ T1244]  ? __kmem_cache_create+0x37/0x60
[   40.631602][ T1244]  misc_register+0x1d3/0x680
[   40.636022][ T1244]  init_btrfs_fs+0xa6/0x260 [btrfs]
[   40.641139][ T1244]  ? __pfx_init_btrfs_fs+0x10/0x10 [btrfs]
[   40.646852][ T1244]  do_one_initcall+0xa4/0x3a0
[   40.651361][ T1244]  ? __pfx_do_one_initcall+0x10/0x10
[   40.656483][ T1244]  ? kasan_unpoison+0x44/0x70
[   40.660997][ T1244]  do_init_module+0x238/0x740
[   40.665513][ T1244]  init_module_from_file+0xd1/0x130
[   40.670543][ T1244]  ? __pfx_init_module_from_file+0x10/0x10
[   40.676180][ T1244]  ? __pfx_userfaultfd_unmap_complete+0x10/0x10
[   40.682252][ T1244]  ? __pfx__raw_spin_lock+0x10/0x10
[   40.687282][ T1244]  idempotent_init_module+0x23b/0x650
[   40.692478][ T1244]  ? __pfx_idempotent_init_module+0x10/0x10
[   40.698193][ T1244]  ? __fget_light+0x57/0x410
[   40.702610][ T1244]  ? security_capable+0x71/0xb0
[   40.707290][ T1244]  __x64_sys_finit_module+0xbe/0x130
[   40.712399][ T1244]  do_syscall_64+0x60/0x170
[   40.716731][ T1244]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[   40.722447][ T1244] RIP: 0033:0x7f3baa34e719
[   40.726694][ T1244] Code: 08 89 e8 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b7 06 0d 00 f7 d8 64 89 01 48
[   40.746041][ T1244] RSP: 002b:00007ffd80ff8248 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[   40.754257][ T1244] RAX: ffffffffffffffda RBX: 00005612a1b66d60 RCX: 00007f3baa34e719
[   40.762039][ T1244] RDX: 0000000000000000 RSI: 00005612915e94a0 RDI: 0000000000000000
[   40.769820][ T1244] RBP: 00005612915e94a0 R08: 0000000000000000 R09: 00005612a1b69c60
[   40.777601][ T1244] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000040000
[   40.785382][ T1244] R13: 0000000000000000 R14: 00005612a1b67030 R15: 0000000000000000
[   40.793165][ T1244]  </TASK>
[   40.796080][ T1244] kobject: kobject_add_internal failed for btrfs-control with -EEXIST, don't try to register things with the same name in the same directory.
[   41.142508][ T1243] request_module fs-btrfs succeeded, but still no fs?


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