On Wed, 20 Apr 2022 at 23:28, syzbot syzbot+f7d9295d2565ee819d21@syzkaller.appspotmail.com wrote:

syzbot suspects this issue was fixed by commit:

commit 3c3201f8c7bb77eb53b08a3ca8d9a4ddc500b4c0 Author: Takashi Iwai tiwai@suse.de Date: Tue Mar 22 17:07:19 2022 +0000

ALSA: pcm: Fix races among concurrent prepare and hw_params/hw_free calls

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=104e3034f00000 start commit: dbb5afad100a ptrace: make ptrace() fail if the tracee chan.. git tree: upstream kernel config: https://syzkaller.appspot.com/x/.config?x=91ff0467ce169bc dashboard link: https://syzkaller.appspot.com/bug?extid=f7d9295d2565ee819d21 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c75e73d00000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: ALSA: pcm: Fix races among concurrent prepare and hw_params/hw_free calls

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks legit, that code is in the stack trace:

#syz fix: ALSA: pcm: Fix races among concurrent prepare and hw_params/hw_free calls