syzbot


WARNING: suspicious RCU usage in kernfs_iop_permission
Status: fixed on 2021/03/10 01:48
Reported-by: syzbot+0e507d08417ca2d565bf@syzkaller.appspotmail.com
Fix commit: b854cc659dcb ovl: avoid deadlock on directory ioctl
First crash: 311d, last: 311d

Cause bisection: introduced by (bisect log) :
commit 89bdfaf93d9157499c3a0d61f489df66f2dead7f
Author: Miklos Szeredi <mszeredi@redhat.com>
Date: Mon Dec 14 14:26:14 2020 +0000

  ovl: make ioctl() safe

Crash: possible deadlock in ovl_dir_real_file (log)
Repro: C syz .config

Sample crash report:

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/02/01 04:16 upstream 6642d600b541 fc9fd31e .config log report syz C WARNING: suspicious RCU usage in kernfs_iop_permission