WARNING: refcount bug in j1939_netdev_start
Status: fixed on 2019/11/29 15:48
Fix commit: fd81ebfe7975 can: j1939: socket: rework socket locking for j1939_sk_release() and j1939_sk_sendmsg()
First crash: 760d, last: 738d

Cause bisection: introduced by (bisect log) :
commit 9d71dd0c70099914fcd063135da3c580865e924c
Author: The j1939 authors <>
Date: Mon Oct 8 09:48:36 2018 +0000

  can: add support of SAE J1939 protocol

Crash: WARNING: refcount bug in j1939_netdev_start (log)
Repro: syz .config
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: refcount bug in j1939_netdev_start (2) syz error error 51 45d 691d 21/22 upstream: reported syz repro on 2020/01/13 06:51

Sample crash report:

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2019/11/11 12:04 upstream 9805a68371ce dc438b91 .config log report syz
ci-upstream-kasan-gce 2019/11/10 13:38 upstream 00aff6836241 dc438b91 .config log report
ci-upstream-kasan-gce-root 2019/11/05 19:05 upstream a99d8080aaf3 0f3ec414 .config log report
ci-upstream-net-this-kasan-gce 2019/11/27 09:24 net a95069ecb709 1048481f .config log report
ci-upstream-net-this-kasan-gce 2019/11/05 18:52 net 3d1e5039f5f8 0f3ec414 .config log report
ci-upstream-net-kasan-gce 2019/11/27 08:37 net-next be2eca94d144 1048481f .config log report