syzbot


WARNING: bad unlock balance in __get_user_pages_remote
Status: fixed on 2020/05/10 10:42
Reported-by: syzbot+a8c70b7f3579fc0587dc@syzkaller.appspotmail.com
Fix commit: c7b6a566b985 mm/gup: Mark lock taken only after a successful retake
First crash: 610d, last: 605d

Cause bisection: introduced by (bisect log) :
commit 71335f37c5e8ec9225285206f7f875057b9737ad
Author: Peter Xu <peterx@redhat.com>
Date: Thu Apr 2 04:08:53 2020 +0000

  mm/gup: allow to react to fatal signals

Crash: WARNING: bad unlock balance in __get_user_pages_remote (log)
Repro: syz .config
Patch testing requests:
Created Duration User Patch Repo Result
2020/04/07 20:48 15m peterx@redhat.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK

Sample crash report:

Crashes (15):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-386 2020/04/08 01:37 upstream 763dede1b248 db9bcd4b .config log report syz C
ci-upstream-kasan-gce 2020/04/07 23:38 upstream 763dede1b248 db9bcd4b .config log report syz
ci-upstream-kasan-gce-smack-root 2020/04/07 14:55 upstream 7e63420847ae 99a96044 .config log report syz
ci-upstream-kasan-gce 2020/04/07 14:50 upstream 7e63420847ae 99a96044 .config log report syz
ci-upstream-kasan-gce-386 2020/04/07 16:04 upstream 7e63420847ae 99a96044 .config log report syz
ci-upstream-linux-next-kasan-gce-root 2020/04/07 15:03 linux-next 5fab54423a0a 99a96044 .config log report syz
ci-upstream-kasan-gce 2020/04/07 21:58 upstream 763dede1b248 db9bcd4b .config log report
ci-upstream-kasan-gce-smack-root 2020/04/07 14:37 upstream 7e63420847ae 99a96044 .config log report
ci-upstream-kasan-gce 2020/04/07 14:29 upstream 7e63420847ae 99a96044 .config log report
ci-upstream-kasan-gce-root 2020/04/06 21:17 upstream 7e63420847ae 99a96044 .config log report
ci-upstream-kasan-gce 2020/04/03 22:42 upstream bef7b2a7be28 5ed396e6 .config log report
ci-upstream-kasan-gce-386 2020/04/07 22:31 upstream 763dede1b248 db9bcd4b .config log report
ci-upstream-kasan-gce-386 2020/04/07 21:44 upstream 763dede1b248 db9bcd4b .config log report
ci-upstream-kasan-gce-386 2020/04/07 14:41 upstream 7e63420847ae 99a96044 .config log report
ci-upstream-linux-next-kasan-gce-root 2020/04/07 14:41 linux-next 5fab54423a0a 99a96044 .config log report