On Wed, Mar 29, 2023 at 05:28:55PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: da8e7da11e4b Merge tag 'nfsd-6.3-4' of git://git.kernel.or.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1266331ec80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=acdb62bf488a8fe5 > dashboard link: https://syzkaller.appspot.com/bug?extid=8ac3859139c685c4f597 > compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11639815c80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12128b1ec80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/62e9c5f4bead/disk-da8e7da1.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/c11aa933e2a7/vmlinux-da8e7da1.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7a21bdd49c84/bzImage-da8e7da1.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8ac3859139c685c4f597@xxxxxxxxxxxxxxxxxxxxxxxxx This bug deserves a #include <asm-generic/bitops/ffs.h>. In any case, it might just be advisable to hold namespace_lock() while cleaning up peer group ids... #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git b4/vfs-mount_setattr-propagation-fix
