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

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Date: Wed, 20 Mar 2024 19:57:45 +0100
From: Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
To: Takashi Iwai <tiwai@...e.de>
Cc: linux-sound@...r.kernel.org, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, Curtis Malainey <cujomalainey@...omium.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [BUG] alsa: KMEMLEAK in pulseaudio and alsa-sink-ALC89

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@...iant:/home/marvin/linux/kernel/linux_torvalds# grep size ~marvin/linux/kernel_bugs/v6.8-11167/kmemleak.log | wc -l
>> 663265
>> root@...iant:/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