bisecting fixing commit since 7f2c5eb458b8855655a19c44cd0043f7f83c595f
building syzkaller on 80a0690249dc4dbbbed95ba197192b99c73694c5
testing commit 7f2c5eb458b8855655a19c44cd0043f7f83c595f with gcc (GCC) 8.4.1 20210217
kernel signature: 907766cbeb173a4d7fa590b3509f0a74ff6439e1793ff4d0e9404c63c2a84b6b
run #0: crashed: WARNING in cgroup_apply_control_disable
run #1: crashed: WARNING in cgroup_apply_control_disable
run #2: crashed: WARNING in cgroup_apply_control_disable
run #3: crashed: WARNING in cgroup_apply_control_disable
run #4: crashed: WARNING in cgroup_apply_control_disable
run #5: crashed: WARNING in cgroup_apply_control_disable
run #6: crashed: WARNING in cgroup_apply_control_disable
run #7: crashed: WARNING in cgroup_apply_control_disable
run #8: crashed: WARNING in cgroup_apply_control_disable
run #9: crashed: WARNING in cgroup_apply_control_disable
run #10: crashed: WARNING in cgroup_apply_control_disable
run #11: crashed: WARNING in cgroup_apply_control_disable
run #12: crashed: WARNING in cgroup_apply_control_disable
run #13: crashed: WARNING in cgroup_apply_control_disable
run #14: crashed: WARNING in cgroup_apply_control_disable
run #15: crashed: WARNING in cgroup_apply_control_disable
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: a1f5df6b9faaaec68ffcd2bbe9226f4607eed4c5b2fed0f7cf4dfcda2ab38a93
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 28m18.007320437s (build: 16m4.585711365s, test: 11m46.717532272s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1