On Thu, May 23, 2024 at 03:09:26AM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: c75962170e49 Add linux-next specific files for 20240517 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1438a5cc980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fba88766130220e8 > dashboard link: https://syzkaller.appspot.com/bug?extid=85e58cdf5b3136471d4b > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=115f3e58980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f4c97c980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/21696f8048a3/disk-c7596217.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b8c71f928633/vmlinux-c7596217.xz > kernel image: https://storage.googleapis.com/syzbot-assets/350bfc6c0a6a/bzImage-c7596217.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/7f6a8434331c/mount_0.gz > > The issue was bisected to: > > commit 9a87907de3597a339cc129229d1a20bc7365ea5f > Author: Miklos Szeredi <mszeredi@xxxxxxxxxx> > Date: Thu May 2 18:35:57 2024 +0000 > > ovl: implement tmpfile In the C reproducer it's btrfs + overlayfs, this more looks like a bug in overlayfs handling the tmpfile and sb_*_write accross layers. Btrfs functions are not on the stack. #syz set subsystems: overlayfs
