WARNING: fs/proc/generic.c:173 __xlate_proc_name

Stefan Wahren
2024-02-10T10:06:58Z

Hi,
we are using libgpiod-2.0.1 with Linux 6.1.49 on our Tarragon hardware
platform. Recently we implemented an application which waits for GPIO
interrupts and we were able to trigger a warning by naming the owner of
the GPIO as "R1/S1":

WARNING: CPU: 0 PID: 429 at fs/proc/generic.c:173
__xlate_proc_name+0x78/0x98 name 'R1/S1'
CPU: 0 PID: 429 Comm: cb_tarragon_dri Not tainted
6.1.49-00019-g9dbc76303a17 #147
Hardware name: Freescale i.MX6 Ultralite (Device Tree)
unwind_backtrace from show_stack+0x10/0x14
show_stack from dump_stack_lvl+0x24/0x2c
dump_stack_lvl from __warn+0x74/0xbc
__warn from warn_slowpath_fmt+0xc8/0x120
warn_slowpath_fmt from __xlate_proc_name+0x78/0x98
__xlate_proc_name from __proc_create+0x3c/0x284
__proc_create from _proc_mkdir+0x2c/0x70
_proc_mkdir from proc_mkdir_data+0x10/0x18
proc_mkdir_data from register_handler_proc+0xc8/0x118
register_handler_proc from __setup_irq+0x554/0x664
__setup_irq from request_threaded_irq+0xac/0x13c
request_threaded_irq from edge_detector_setup+0xc0/0x1f8
edge_detector_setup from linereq_create+0x30c/0x384
linereq_create from vfs_ioctl+0x20/0x38
vfs_ioctl from sys_ioctl+0xbc/0x8b0
sys_ioctl from ret_fast_syscall+0x0/0x54
Exception stack(0xe0b61fa8 to 0xe0b61ff0)
1fa0:                   01b019b8 01a9f428 0000000d c250b407 beeae888
beeae880
1fc0: 01b019b8 01a9f428 01af7e40 00000036 beeaeb88 beeaeb80 beeaeb58
beeaeb60
1fe0: 00000036 beeae868 b6a88569 b6a01ae6
---[ end trace 0000000000000000 ]---

I'm not sure where this should be fixed.