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

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