Re: [BUG] alsa: KMEMLEAK in pulseaudio and alsa-sink-ALC89

Mirsad Todorovac
2024-03-20T18:58:05Z

On 3/20/24 07:26, Takashi Iwai wrote:
> On Wed, 20 Mar 2024 02:13:08 +0100,
> Mirsad Todorovac wrote:
>>
>> Hi,
>>
>> On Ubuntu 22.04 LTS, with the torvalds tree kernel vanilla v6.8-11167-g4438a810f396,
>> there is like 660K memory leaks sized 2048 bytes (1.35 GB)
>>
>> unreferenced object 0xffff919c43c7c800 (size 2048):
>> unreferenced object 0xffff919c43c78000 (size 2048):
>> unreferenced object 0xffff919c43c79800 (size 2048):
>> root@defiant:/home/marvin/linux/kernel/linux_torvalds# grep size ~marvin/linux/kernel_bugs/v6.8-11167/kmemleak.log | wc -l
>> 663265
>> root@defiant:/home/marvin/linux/kernel/linux_torvalds#
>>
>> Please find the .config attached.
>>
>> The kmemleak output is:
>>
>> unreferenced object 0xffff9199526ba800 (size 2048):
>> comm "pulseaudio", pid 2533, jiffies 4294900352
>> hex dump (first 32 bytes):
>> 04 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00 ................
>> 49 45 43 39 35 38 20 50 6c 61 79 62 61 63 6b 20 IEC958 Playback
>> backtrace (crc 87c1dcdc):
>> [<ffffffffb2fa477b>] kmemleak_alloc+0x4b/0x90
>> [<ffffffffb210e517>] __kmalloc_node_track_caller+0x3c7/0x530
>> [<ffffffffb20a102b>] memdup_user+0x2b/0xb0
>> [<ffffffffc0746d56>] snd_ctl_ioctl+0x726/0x860 [snd]
>> [<ffffffffb21bed6d>] __x64_sys_ioctl+0x9d/0xe0
>> [<ffffffffb2f93d33>] do_syscall_64+0x83/0x150
>> [<ffffffffb3000121>] entry_SYSCALL_64_after_hwframe+0x6c/0x74
>
> Thanks for the report. This was indeed an overlooked marking of
> __free(kfree). I'll submit the fix patch.
>
> Takashi

Not at all, thanks for such an early response.

I understand the problems with the incremental development. Actually, great it was caught before
the release ;-)

Best regards,
Mirsad Todorovac