[driver-core:debugfs_cleanup] [sysfs] 868bc4ac86: WARNING:at_fs/sysfs/group.c:#sysfs_remove_group

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Hello,

kernel test robot noticed "WARNING:at_fs/sysfs/group.c:#sysfs_remove_group" on:

commit: 868bc4ac8686c4118c66bd6926b777ded345309e ("sysfs: do not create empty directories if no attributes are present")
https://git.kernel.org/cgit/linux/kernel/git/gregkh/driver-core.git debugfs_cleanup

in testcase: boot

compiler: clang-16
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+-------------------------------------------------+------------+------------+
|                                                 | ef43695802 | 868bc4ac86 |
+-------------------------------------------------+------------+------------+
| WARNING:at_fs/sysfs/group.c:#sysfs_remove_group | 0          | 8          |
| RIP:sysfs_remove_group                          | 0          | 8          |
+-------------------------------------------------+------------+------------+


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/202309051359.dcd93d4f-oliver.sang@xxxxxxxxx


[   17.350543][    T1] ------------[ cut here ]------------
[   17.351171][    T1] sysfs group 'power' not found for kobject 'serial0'
[ 17.351982][ T1] WARNING: CPU: 0 PID: 1 at fs/sysfs/group.c:303 sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[   17.353035][    T1] Modules linked in:
[   17.353499][    T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.5.0-10211-g868bc4ac8686 #6
[   17.354450][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 17.355602][ T1] RIP: 0010:sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[ 17.356262][ T1] Code: 8b 34 24 4c 89 f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 86 14 d6 ff 49 8b 17 48 c7 c7 80 b6 f6 84 4c 89 f6 e8 f4 d5 4b ff <0f> 0b e9 fc 00 00 00 e8 a8 4d 81 ff 4c 8b 6d d0 4d 8d 7c 24 20 4c
All code
========
   0:	8b 34 24             	mov    (%rsp),%esi
   3:	4c 89 f8             	mov    %r15,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   e:	74 08                	je     0x18
  10:	4c 89 ff             	mov    %r15,%rdi
  13:	e8 86 14 d6 ff       	call   0xffffffffffd6149e
  18:	49 8b 17             	mov    (%r15),%rdx
  1b:	48 c7 c7 80 b6 f6 84 	mov    $0xffffffff84f6b680,%rdi
  22:	4c 89 f6             	mov    %r14,%rsi
  25:	e8 f4 d5 4b ff       	call   0xffffffffff4bd61e
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	e9 fc 00 00 00       	jmp    0x12d
  31:	e8 a8 4d 81 ff       	call   0xffffffffff814dde
  36:	4c 8b 6d d0          	mov    -0x30(%rbp),%r13
  3a:	4d 8d 7c 24 20       	lea    0x20(%r12),%r15
  3f:	4c                   	rex.WR

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	e9 fc 00 00 00       	jmp    0x103
   7:	e8 a8 4d 81 ff       	call   0xffffffffff814db4
   c:	4c 8b 6d d0          	mov    -0x30(%rbp),%r13
  10:	4d 8d 7c 24 20       	lea    0x20(%r12),%r15
  15:	4c                   	rex.WR
[   17.358463][    T1] RSP: 0000:ffffc9000001ee98 EFLAGS: 00010246
[   17.359141][    T1] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
[   17.360026][    T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[   17.360926][    T1] RBP: ffffc9000001eed0 R08: 0000000000000000 R09: 0000000000000000
[   17.361839][    T1] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff851d26c0
[   17.362736][    T1] R13: 1ffffffff0a3a4d8 R14: ffffffff851d26a0 R15: ffff88816d32c000
[   17.363619][    T1] FS:  0000000000000000(0000) GS:ffff8883ae800000(0000) knlGS:0000000000000000
[   17.364612][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.365352][    T1] CR2: ffff88843ffff000 CR3: 0000000005c71000 CR4: 00000000000406b0
[   17.366243][    T1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   17.367132][    T1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   17.368042][    T1] Call Trace:
[   17.368423][    T1]  <TASK>
[ 17.368767][ T1] ? show_regs (kbuild/src/rand/arch/x86/kernel/dumpstack.c:479) 
[ 17.369267][ T1] ? __warn (kbuild/src/rand/kernel/panic.c:235) 
[ 17.369764][ T1] ? sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[ 17.370364][ T1] ? sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[ 17.370964][ T1] ? report_bug (kbuild/src/rand/lib/bug.c:?) 
[ 17.371492][ T1] ? handle_bug (kbuild/src/rand/arch/x86/kernel/traps.c:237) 
[ 17.371993][ T1] ? exc_invalid_op (kbuild/src/rand/arch/x86/kernel/traps.c:258) 
[ 17.372544][ T1] ? asm_exc_invalid_op (kbuild/src/rand/arch/x86/include/asm/idtentry.h:568) 
[ 17.373122][ T1] ? sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[ 17.373713][ T1] ? sysfs_remove_group (kbuild/src/rand/fs/sysfs/group.c:301) 
[ 17.374299][ T1] ? sysfs_unmerge_group (kbuild/src/rand/fs/sysfs/group.c:?) 
[ 17.374900][ T1] dpm_sysfs_remove (kbuild/src/rand/drivers/base/power/sysfs.c:?) 
[ 17.375432][ T1] device_del (kbuild/src/rand/drivers/base/core.c:3742) 
[ 17.375928][ T1] ? _raw_spin_unlock_irq (kbuild/src/rand/arch/x86/include/asm/irqflags.h:42 kbuild/src/rand/arch/x86/include/asm/irqflags.h:77 kbuild/src/rand/include/linux/spinlock_api_smp.h:159 kbuild/src/rand/kernel/locking/spinlock.c:202) 
[ 17.376524][ T1] serdev_controller_add (kbuild/src/rand/drivers/tty/serdev/core.c:?) 
[ 17.377124][ T1] ? serdev_controller_alloc (kbuild/src/rand/include/linux/pm_runtime.h:120) 
[ 17.377764][ T1] serdev_tty_port_register (kbuild/src/rand/drivers/tty/serdev/serdev-ttyport.c:302) 
[ 17.378409][ T1] tty_port_register_device_attr_serdev (kbuild/src/rand/drivers/tty/tty_port.c:191) 
[ 17.379186][ T1] serial_core_register_port (kbuild/src/rand/include/linux/err.h:61 kbuild/src/rand/drivers/tty/serial/serial_core.c:3151 kbuild/src/rand/drivers/tty/serial/serial_core.c:3355) 
[ 17.379876][ T1] serial_ctrl_register_port (kbuild/src/rand/drivers/tty/serial/serial_ctrl.c:41) 
[ 17.380497][ T1] uart_add_one_port (kbuild/src/rand/drivers/tty/serial/serial_port.c:75) 
[ 17.381037][ T1] serial8250_register_8250_port (kbuild/src/rand/drivers/tty/serial/8250/8250_core.c:1141) 
[ 17.383151][ T1] serial_pnp_probe (kbuild/src/rand/drivers/tty/serial/8250/8250_pnp.c:448) 
[ 17.383823][ T1] pnp_device_probe (kbuild/src/rand/drivers/pnp/driver.c:113) 
[ 17.384380][ T1] ? __cfi_pnp_device_probe (kbuild/src/rand/drivers/pnp/driver.c:83) 
[ 17.384993][ T1] really_probe (kbuild/src/rand/drivers/base/dd.c:?) 
[ 17.385523][ T1] ? __kasan_check_write (kbuild/src/rand/mm/kasan/shadow.c:37) 
[ 17.386109][ T1] __driver_probe_device (kbuild/src/rand/drivers/base/dd.c:800) 
[ 17.386707][ T1] driver_probe_device (kbuild/src/rand/drivers/base/dd.c:830) 
[ 17.387271][ T1] __driver_attach (kbuild/src/rand/drivers/base/dd.c:1217) 
[ 17.387808][ T1] bus_for_each_dev (kbuild/src/rand/drivers/base/bus.c:367) 
[ 17.388358][ T1] ? __cfi___driver_attach (kbuild/src/rand/drivers/base/dd.c:1157) 
[ 17.388972][ T1] driver_attach (kbuild/src/rand/drivers/base/dd.c:1233) 
[ 17.389487][ T1] bus_add_driver (kbuild/src/rand/drivers/base/bus.c:674) 
[ 17.390031][ T1] driver_register (kbuild/src/rand/drivers/base/driver.c:247) 
[ 17.390573][ T1] ? __cfi_serial8250_init (kbuild/src/rand/drivers/tty/serial/8250/8250_core.c:1220) 
[ 17.391178][ T1] pnp_register_driver (kbuild/src/rand/drivers/pnp/driver.c:274) 
[ 17.391741][ T1] serial8250_pnp_init (kbuild/src/rand/drivers/tty/serial/8250/8250_pnp.c:533) 
[ 17.392309][ T1] serial8250_init (kbuild/src/rand/drivers/tty/serial/8250/8250_core.c:1241) 
[ 17.392838][ T1] do_one_initcall (kbuild/src/rand/init/main.c:1232) 
[ 17.393762][ T1] do_initcall_level (kbuild/src/rand/init/main.c:1293) 
[ 17.394329][ T1] ? kernel_init (kbuild/src/rand/init/main.c:1439) 
[ 17.394845][ T1] do_initcalls (kbuild/src/rand/init/main.c:1307) 
[ 17.395351][ T1] do_basic_setup (kbuild/src/rand/init/main.c:1330) 
[ 17.395871][ T1] kernel_init_freeable (kbuild/src/rand/init/main.c:1548) 
[ 17.396469][ T1] ? __cfi_kernel_init (kbuild/src/rand/init/main.c:1429) 
[ 17.397019][ T1] kernel_init (kbuild/src/rand/init/main.c:1439) 
[ 17.397509][ T1] ? __cfi_kernel_init (kbuild/src/rand/init/main.c:1429) 
[ 17.398057][ T1] ret_from_fork (kbuild/src/rand/arch/x86/kernel/process.c:153) 
[ 17.398552][ T1] ? __cfi_kernel_init (kbuild/src/rand/init/main.c:1429) 
[ 17.399110][ T1] ret_from_fork_asm (kbuild/src/rand/arch/x86/entry/entry_64.S:312) 
[   17.399669][    T1]  </TASK>
[   17.400010][    T1] irq event stamp: 468845
[ 17.400490][ T1] hardirqs last enabled at (468853): __up_console_sem (kbuild/src/rand/arch/x86/include/asm/irqflags.h:19) 
[ 17.401573][ T1] hardirqs last disabled at (468860): __up_console_sem (kbuild/src/rand/kernel/printk/printk.c:345) 
[ 17.402694][ T1] softirqs last enabled at (468874): __irq_exit_rcu (kbuild/src/rand/kernel/softirq.c:612) 
[ 17.403770][ T1] softirqs last disabled at (468869): __irq_exit_rcu (kbuild/src/rand/kernel/softirq.c:612) 
[   17.404828][    T1] ---[ end trace 0000000000000000 ]---
[   17.407738][    T1] serial 00:05: using ACPI '_SB.PCI0.S08.COM1' for 'rs485-term' GPIO lookup
[   17.408738][    T1] acpi PNP0501:01: GPIO: looking up rs485-term-gpios
[   17.409505][    T1] acpi PNP0501:01: GPIO: looking up rs485-term-gpio
[   17.410252][    T1] serial 00:05: using lookup tables for GPIO lookup
[   17.411001][    T1] serial 00:05: No GPIO consumer rs485-term found
[   17.411723][    T1] serial 00:05: using ACPI '_SB.PCI0.S08.COM1' for 'rs485-rx-during-tx' GPIO lookup
[   17.412831][    T1] acpi PNP0501:01: GPIO: looking up rs485-rx-during-tx-gpios
[   17.413677][    T1] acpi PNP0501:01: GPIO: looking up rs485-rx-during-tx-gpio
[   17.414499][    T1] serial 00:05: using lookup tables for GPIO lookup
[   17.415230][    T1] serial 00:05: No GPIO consumer rs485-rx-during-tx found
[   17.417775][    T1] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20230905/202309051359.dcd93d4f-oliver.sang@xxxxxxxxx



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki




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