bisecting fixing commit since 7f2c5eb458b8855655a19c44cd0043f7f83c595f
building syzkaller on 80a0690249dc4dbbbed95ba197192b99c73694c5
testing commit 7f2c5eb458b8855655a19c44cd0043f7f83c595f
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 15244d1e06e07c341655c1efbf420fd460b52b975d3192aa062016c399db4b44
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: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD 66722c42ec916e92cadda46316f8f6e3fdcaedc6
testing commit 66722c42ec916e92cadda46316f8f6e3fdcaedc6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 541385ecd95b43de68b997628e020ed1e7a58cee2d3c4b24fbcae8d994112efa
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 33m12.01432054s (build: 20m47.338483845s, test: 11m50.704821752s)
the crash still happens on HEAD
commit msg: Linux 4.14.256
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1