bisecting fixing commit since c10b57a567e4333b9fdf60b5ec36de9859263ca2
building syzkaller on 365fba2440cee3aed74c774867a1f43e3e2f7aac
testing commit c10b57a567e4333b9fdf60b5ec36de9859263ca2 with gcc (GCC) 8.4.1 20210217
kernel signature: 4728b264a4d036595ec23598ab47f670122ae8e8d8dd2b0a625c87370510dc94
all runs: crashed: possible deadlock in perf_event_read_value
testing current HEAD 4e68c9b0763ff55eaa69d6e519f07515f1c9037b
testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b with gcc (GCC) 8.4.1 20210217
kernel signature: 56c9e74ee6eab5266c96cb6dec4934294bf460c7946dd37cf09fa6f5f7b05cf8
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m27.186696822s (build: 23m4.241620652s, test: 6m45.551108962s)
the crash still happens on HEAD
commit msg: Linux 4.14.239
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1