bisecting fixing commit since c10b57a567e4333b9fdf60b5ec36de9859263ca2
building syzkaller on 365fba2440cee3aed74c774867a1f43e3e2f7aac
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.4.1 20210217
kernel signature: 734db19bfe5c40b275a12694a6a38be9e3f41c939ba68f017c43d8232f7217ca
all runs: crashed: possible deadlock in perf_event_read_value
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 81d2ae2f7ae49f654264db91743e1e24d5617e810aaa7ace744b6ed1e4822f87
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m55.49899724s (build: 15m17.076017193s, test: 6m13.561021388s)
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