bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on 5ea87a6638e52a94361b26b8576a1605585815fb
testing commit b98aebd298246df37b472c52a2ee1023256d02e3
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6b042edd841da4baa7231201b09169fc6951d94a4c8811fc91b540084b85783e
run #0: crashed: possible deadlock in perf_event_release_kernel
run #1: crashed: possible deadlock in perf_event_release_kernel
run #2: crashed: possible deadlock in perf_event_release_kernel
run #3: crashed: possible deadlock in perf_read
run #4: crashed: possible deadlock in perf_event_release_kernel
run #5: crashed: possible deadlock in perf_read
run #6: crashed: possible deadlock in perf_event_release_kernel
run #7: crashed: possible deadlock in perf_event_release_kernel
run #8: crashed: possible deadlock in perf_event_release_kernel
run #9: crashed: possible deadlock in perf_event_release_kernel
run #10: crashed: possible deadlock in perf_event_release_kernel
run #11: crashed: possible deadlock in perf_read
run #12: crashed: possible deadlock in perf_event_release_kernel
run #13: crashed: possible deadlock in perf_event_release_kernel
run #14: crashed: possible deadlock in perf_event_release_kernel
run #15: crashed: possible deadlock in perf_event_release_kernel
run #16: crashed: possible deadlock in perf_read
run #17: crashed: possible deadlock in perf_event_release_kernel
run #18: crashed: possible deadlock in perf_event_release_kernel
run #19: crashed: possible deadlock in perf_event_release_kernel
testing current HEAD 5f9f3b0057d5c5782985784ba0159b05b4083055
testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: b33db0ca2cf405a1173836bc79c7d7658a3d2e3983a1f95d0b2ef3896f27c416
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m44.768923017s (build: 14m45.249371483s, test: 6m34.416731983s)
the crash still happens on HEAD
commit msg: Linux 4.14.255
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1