syzbot


INFO: task hung in flush_to_ldisc (3)
Status: upstream: reported C repro on 2021/07/29 18:57
Reported-by: syzbot+5864be6ce31bdf05e8ee@syzkaller.appspotmail.com
First crash: 90d, last: 17d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: INFO: task hung in flush_to_ldisc (log)
Repro: C syz .config
similar bugs (8):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in flush_to_ldisc (2) 1 466d 466d 0/1 auto-closed as invalid on 2020/11/11 17:44
upstream INFO: task hung in flush_to_ldisc (2) 1 197d 197d 0/22 auto-closed as invalid on 2021/06/09 11:04
linux-4.19 INFO: task hung in flush_to_ldisc 10 615d 678d 0/1 auto-closed as invalid on 2020/06/15 14:09
upstream INFO: task hung in flush_to_ldisc C inconclusive done 15 618d 688d 17/22 fixed on 2020/11/16 12:12
linux-4.14 INFO: task hung in flush_to_ldisc (3) 1 228d 228d 0/1 auto-closed as invalid on 2021/07/07 16:40
linux-4.14 INFO: task hung in flush_to_ldisc (2) 1 419d 419d 0/1 auto-closed as invalid on 2020/12/28 13:53
linux-4.19 INFO: task hung in flush_to_ldisc (3) 1 180d 180d 0/1 auto-closed as invalid on 2021/08/25 00:39
linux-4.14 INFO: task hung in flush_to_ldisc 8 608d 678d 0/1 auto-closed as invalid on 2020/06/23 11:01

Sample crash report:

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/10/06 18:32 upstream 60a9483534ed 6c236867 .config log report syz C
ci-upstream-kasan-gce-smack-root 2021/09/06 14:56 upstream 27151f177827 6c236867 .config log report syz C
Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/08/03 08:41 upstream c500bee1c5b2 6c236867 .config log report syz C INFO: task hung in flush_to_ldisc
ci-upstream-kasan-gce-root 2021/07/25 18:46 upstream 6498f6151825 4d1b57d4 .config log report syz C INFO: task hung in flush_to_ldisc
ci-upstream-kasan-gce-smack-root 2021/07/28 09:54 upstream 7d549995d4e0 17d6ab15 .config log report info INFO: task hung in flush_to_ldisc