bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on 5ea87a6638e52a94361b26b8576a1605585815fb
testing commit b98aebd298246df37b472c52a2ee1023256d02e3
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 8a026da193d4a9449ca175185e911029cefdba18597bad69f16e61ce118f3f04
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_event_release_kernel
run #4: crashed: possible deadlock in perf_event_release_kernel
run #5: crashed: possible deadlock in perf_event_release_kernel
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_read
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_event_release_kernel
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_read
run #16: crashed: possible deadlock in perf_event_release_kernel
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 ed99bf0e81b558df39f7db2fa96d0228be4198c6
testing commit ed99bf0e81b558df39f7db2fa96d0228be4198c6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 7c6322aff2cc0dae14483c4459d1f79c1cb9c021945427501b44dbd8e33a73fe
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 31m23.398427173s (build: 24m32.220368166s, test: 6m2.336315707s)
the crash still happens on HEAD
commit msg: Linux 4.14.250
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1