syzbot has bisected this bug to:
commit 6a34367e52caea1413eb0a0dcbb524f0c9b67e82 Author: Takashi Iwai tiwai@suse.de Date: Thu Nov 7 19:20:08 2019 +0000
ALSA: timer: Fix possible race at assigning a timer instance
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16b5dde6e00000 start commit: 6980b7f6 Add linux-next specific files for 20191111 git tree: linux-next final crash: https://syzkaller.appspot.com/x/report.txt?x=15b5dde6e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=11b5dde6e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=2af7db1972ec750e dashboard link: https://syzkaller.appspot.com/bug?extid=4476917c053f60112c99 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108fbfece00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1055d5aae00000
Reported-by: syzbot+4476917c053f60112c99@syzkaller.appspotmail.com Fixes: 6a34367e52ca ("ALSA: timer: Fix possible race at assigning a timer instance")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection