On 5/8/23 08:51, Greg Kroah-Hartman wrote:
On Mon, May 08, 2023 at 08:30:07AM +0200, Mirsad Goran Todorovac wrote:
Hi,
There seems to be a kernel memory leak in the USB keyboard driver.
The leaked memory allocs are 96 and 512 bytes.
The platform is Ubuntu 22.04 LTS on a assembled AMD Ryzen 9 with X670E PG
Lightning mobo,
and Genius SlimStar i220 GK-080012 keyboard.
(Logitech M100 HID mouse is not affected by the bug.)
BIOS is:
*-firmware
description: BIOS
vendor: American Megatrends International, LLC.
physical id: 0
version: 1.21
date: 04/26/2023
size: 64KiB
The kernel is 6.3.0-torvalds-<id>-13466-gfc4354c6e5c2.
The keyboard is recognised as Chicony:
*-usb
description: Keyboard
product: CHICONY USB Keyboard
vendor: CHICONY
physical id: 2
bus info: usb@5:2
logical name: input35
logical name: /dev/input/event4
logical name: input35::capslock
logical name: input35::numlock
logical name: input35::scrolllock
logical name: input36
logical name: /dev/input/event5
logical name: input37
logical name: /dev/input/event6
logical name: input38
logical name: /dev/input/event8
version: 2.30
capabilities: usb-2.00 usb
configuration: driver=usbhid maxpower=100mA
speed=1Mbit/s
The bug is easily reproduced by unplugging the USB keyboard, waiting about a
couple of seconds,
and then reconnect and scan for memory leaks twice.
The kmemleak log is as follows [edited privacy info]:
root@hostname:/home/username# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8dd020037c00 (size 96):
comm "systemd-udevd", pid 435, jiffies 4294892550 (age 8909.356s)
hex dump (first 32 bytes):
5d 8e 4e b9 ff ff ff ff 00 00 00 00 00 00 00 00 ].N.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffffb81a74be>] __kmem_cache_alloc_node+0x22e/0x2b0
[<ffffffffb8127b6e>] kmalloc_trace+0x2e/0xa0
[<ffffffffb87543d9>] class_create+0x29/0x80
[<ffffffffb8880d24>] usb_register_dev+0x1d4/0x2e0
As the call to class_create() in this path is now gone in 6.4-rc1, can
you retry that release to see if this is still there or not?
Certainly, but probably not before 6 PM UTC+02.
Best regards,
Mirsad
--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu
System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
"What’s this thing suddenly coming towards me very fast? Very very fast.
... I wonder if it will be friends with me?"
