Re: [bug report] kmemleak from driver i2c_piix4

[Jean Delvare <jdelvare@suse.de>]

Hi Yi Zhang,

On Sat, 11 Jun 2022 17:08:20 +0800, Yi Zhang wrote:
> I found this kmemleak from dmesg, pls help check it, thanks.
> 
> unreferenced object 0xffff8882be7fa500 (size 64):
>   comm "systemd-udevd", pid 851, jiffies 4294724190 (age 1880.031s)
>   hex dump (first 32 bytes):
>     00 03 d8 fe 00 00 00 00 07 03 d8 fe 00 00 00 00  ................
>     20 95 85 c0 ff ff ff ff 00 02 40 80 00 00 00 00   .........@.....
>   backtrace:
>     [<00000000ee7a7c0d>] __request_region+0x4f/0xc0
>     [<000000000a0d9a20>] piix4_sb800_region_request+0x69/0x150 [i2c_piix4]
>     [<00000000bbbc5f63>] piix4_setup_sb800.constprop.0+0xfd/0x4a0 [i2c_piix4]
>     [<0000000060da9710>] piix4_probe+0x111/0x780 [i2c_piix4]
>     [<0000000061a2fccd>] local_pci_probe+0xdf/0x170
>     [<00000000f879d262>] pci_call_probe+0x15f/0x4b0
>     [<00000000b1b4235f>] pci_device_probe+0xee/0x230
>     [<000000007b0612f3>] really_probe+0x3d7/0xa10
>     [<0000000016a94cde>] __driver_probe_device+0x2ab/0x460
>     [<00000000fc08f31f>] driver_probe_device+0x49/0x120
>     [<00000000c7600ea6>] __driver_attach+0x1c1/0x420
>     [<00000000d075fad5>] bus_for_each_dev+0x121/0x1a0
>     [<000000003a0c2b72>] bus_add_driver+0x39f/0x570
>     [<00000000389c6619>] driver_register+0x20f/0x390
>     [<00000000e1871c0e>] do_one_initcall+0xfc/0x560
>     [<00000000899e6968>] do_init_module+0x190/0x620

Thanks for reporting.

Which kernel version are you running? Are there patches applied to the
i2c-piix4 driver?

Which line of the source code does
piix4_sb800_region_request+0x69/0x150 resolve to?

Which PCI device does the driver bind to? "lspci -nn | grep" SMBus
should tell.

Which messages are printed to the kernel log when you load and unload
the i2c-piix4 driver?

-- 
Jean Delvare
SUSE L3 Support