syzbot


INFO: task can't die in nbd_ioctl
Status: upstream: reported C repro on 2020/10/05 07:20
Reported-by: syzbot+69a90a5e8f6b59086b2a@syzkaller.appspotmail.com
First crash: 308d, last: 115d

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_config_put (log)
Repro: C syz .config
similar bugs (3):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in nbd_ioctl C 52 5h22m 663d 0/1 upstream: reported C repro on 2019/10/12 13:11
upstream INFO: task hung in nbd_ioctl (3) C done unreliable 8 13d 311d 0/22 upstream: reported C repro on 2020/09/28 07:17
linux-4.14 INFO: task hung in nbd_ioctl (3) C 7 21d 265d 0/1 upstream: reported C repro on 2020/11/13 07:37
Patch testing requests:
Created Duration User Patch Repo Result
2020/11/13 12:10 21m dvyukov@google.com git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next-history.git 4e78c578 report log

Sample crash report:

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-linux-next-kasan-gce-root 2020/10/30 19:57 linux-next 4e78c578cb98 a6e3ac3b .config log report syz C
ci-upstream-linux-next-kasan-gce-root 2021/04/12 12:52 linux-next e99d8a849517 bfeda1b1 .config log report info INFO: task can't die in nbd_ioctl
ci-upstream-linux-next-kasan-gce-root 2020/10/01 04:26 linux-next de69ee6df1cf 8516f6d3 .config log report info