WARNING: refcount bug in igmp_start_timer
Status: upstream: reported syz repro on 2018/08/18 16:37
First crash: 402d, last: 162d
Bisection: introduced by (bisect log):

commit fc5e9d63a8db40e9e3a3b180be33d44af8a3cee8
Author: Daniel Vetter <>
Date: Wed May 24 14:52:05 2017 +0000

  drm/sti: Drop drm_vblank_cleanup

Tree: upstream
Crash: WARNING: ODEBUG bug in __do_softirq (log)
Repro: syz .config
Bisection: the bug occurs on the latest tested release
Tree: upstream
Crash: WARNING: refcount bug in igmp_start_timer (log)
Repro: syz .config
similar bugs (1):
Kernel Title Repro Bisected Count Last Reported Patched Status
android-414 WARNING: refcount bug in igmp_start_timer syz 2 275d 164d 0/1 public: reported syz repro on 2019/04/13 00:01

Sample crash report:

All crashes (19):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci-upstream-kasan-gce-selinux-root 2018/09/20 20:05 upstream ae596de1 6cee973c .config log report syz,,,,
ci-upstream-kasan-gce-selinux-root 2018/12/22 21:42 upstream 23203e3f e3bd7ab8 .config log report syz,,,,
ci-upstream-kasan-gce-selinux-root 2018/10/21 15:24 upstream 23469de6 ecb386fe .config log report syz,,,,
ci-upstream-linux-next-kasan-gce-root 2018/10/22 04:26 linux-next 8c60c36d ecb386fe .config log report syz,,,,
ci-upstream-kasan-gce 2018/08/18 01:57 upstream edb0a200 738da825 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2019/04/14 09:09 upstream 4443f8e6 c402d8f1 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/12/24 15:03 upstream 8fe28cb5 be79df56 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/12/18 08:13 upstream 1a9430db def91db3 .config log report,,,,
ci-upstream-kasan-gce-root 2018/10/31 06:04 upstream 310c7585 4ccf7bb4 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/10/21 14:57 upstream 23469de6 ecb386fe .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/09/29 14:39 upstream e704966c 41e4b329 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/09/26 07:05 upstream 846e8dd4 b7e11289 .config log report,,,,
ci-upstream-kasan-gce-selinux-root 2018/09/20 19:40 upstream ae596de1 6cee973c .config log report,,,,
ci-upstream-kasan-gce-386 2019/02/16 22:10 upstream 5ded5871 f42dee6d .config log report,,,,
ci-upstream-net-this-kasan-gce 2019/02/22 14:44 net 6321aa19 6a5fcca4 .config log report,,,,
ci-upstream-net-this-kasan-gce 2019/02/15 19:50 net f9bcc9f3 f6f233c0 .config log report,,,,
ci-upstream-net-kasan-gce 2019/01/15 23:43 net-next 7939f8be 79cb1a7c .config log report,,,,
ci-upstream-linux-next-kasan-gce-root 2018/11/02 00:38 linux-next 4db9d11b 1f38e9ae .config log report,,,,
ci-upstream-linux-next-kasan-gce-root 2018/10/27 20:07 linux-next 8c60c36d 8efba39a .config log report,,,,