syzbot


INFO: task hung in nbd_ioctl (3)
Status: upstream: reported C repro on 2020/09/28 07:17
Reported-by: syzbot+fe03c50d25c0188f7487@syzkaller.appspotmail.com
First crash: 224d, last: 5d11h

Cause bisection: introduced by (bisect log) :
commit e9e006f5fcf2bab59149cb38a48a4817c1b538b4
Author: Mike Christie <mchristi@redhat.com>
Date: Sun Aug 4 19:10:06 2019 +0000

  nbd: fix max number of supported devs

Crash: INFO: task hung in nbd_ioctl (log)
Repro: syz .config

Fix bisection: fixed by (bisect log) [merge commit]:
commit da0628559871475b482f015dc24c9bef372936e4
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon Dec 14 20:05:10 2020 +0000

  Merge tag 'tomoyo-pr-20201214' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1

similar bugs (7):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in nbd_ioctl C done 18 500d 574d 1/1 fixed on 2019/12/28 10:32
linux-4.14 INFO: task hung in nbd_ioctl (2) C done 16 247d 493d 1/1 fixed on 2020/10/21 11:01
upstream INFO: task hung in nbd_ioctl (2) 37 255d 308d 17/22 fixed on 2020/09/25 01:17
upstream INFO: task hung in nbd_ioctl C done 71 552d 587d 14/22 fixed on 2019/11/06 12:39
linux-4.19 INFO: task hung in nbd_ioctl C 44 18h50m 576d 0/1 upstream: reported C repro on 2019/10/12 13:11
linux-4.14 INFO: task hung in nbd_ioctl (3) C 6 10d 178d 0/1 upstream: reported C repro on 2020/11/13 07:37
upstream INFO: task can't die in nbd_ioctl C done 3 28d 217d 0/22 upstream: reported C repro on 2020/10/05 07:20

Sample crash report:

Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/02/16 06:35 upstream f40ddce8 98682e5e .config log report syz C INFO: task hung in nbd_ioctl
ci-upstream-kasan-gce-selinux-root 2020/09/29 09:51 upstream fb0155a0 1b88c6d5 .config log report syz
ci-upstream-kasan-gce-root 2020/09/28 04:35 upstream a1bffa48 5dd8aee8 .config log report syz
ci-upstream-kasan-gce-root 2021/05/05 08:04 upstream d2b6f8a1 06c27ff5 .config log report info INFO: task hung in nbd_ioctl
ci-upstream-kasan-gce-smack-root 2021/04/09 13:26 upstream 4fa56ad0 6a81331a .config log report info INFO: task hung in nbd_ioctl
ci-upstream-kasan-gce-selinux-root 2021/02/18 20:23 upstream f40ddce8 14052202 .config log report info INFO: task hung in nbd_ioctl
ci-upstream-kasan-gce-smack-root 2021/02/16 04:14 upstream f40ddce8 98682e5e .config log report info INFO: task hung in nbd_ioctl