On Thu, 19 May 2022 at 04:04, Liam Howlett <liam.howlett@xxxxxxxxxx> wrote: > > * Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> [220516 13:59]: > > * Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> [220514 16:50]: > > > On Sat, 14 May 2022 13:18:26 -0700 syzbot <syzbot+ee1fdd8dcc770a3a169a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > > > > syzbot has found a reproducer for the following issue on: > > > > > > > > HEAD commit: 1e1b28b936ae Add linux-next specific files for 20220513 > > > > git tree: linux-next > > > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=11da21b9f00000 > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=e4eb3c0c4b289571 > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=ee1fdd8dcc770a3a169a > > > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=142757f1f00000 > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17cf0966f00000 > > > > > > Thanks. > > > > > > So it was there on April 28 and it's there now. Liam, do you think > > > anything in the mapletree changes could have perturbed the interval > > > tree handling? > > > > It is certainly possible, these two trees are intertwined so much. One > > area that sticks out as a possibility is vma_expand(). I created a > > vma_expand() function to handle growing a vma and potentially removing > > the next vma. I do some interval tree modifications in there. > > > > I'll add it to my list of items to look at. > > This was my bug. I reused a pointer that wasn't reused in this function > until I altered the error path in this commit. > > Please apply this patch to the maple tree series to fix "mm/mmap: use > advanced maple tree API for mmap_region()" Please add this tag to the fix: IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ee1fdd8dcc770a3a169a@xxxxxxxxxxxxxxxxxxxxxxxxx
