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

[Takashi Iwai]

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