bisecting fixing commit since b98aebd298246df37b472c52a2ee1023256d02e3
building syzkaller on 5ea87a6638e52a94361b26b8576a1605585815fb
testing commit b98aebd298246df37b472c52a2ee1023256d02e3
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 6aee055b2853e9a857c7b8cd6316fff609a38d6b34422c44b4017c77b6057999
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_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_read
run #9: crashed: possible deadlock in perf_read
run #10: crashed: possible deadlock in perf_read
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_read
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_event_release_kernel
run #17: crashed: possible deadlock in perf_read
run #18: crashed: possible deadlock in perf_event_release_kernel
run #19: crashed: possible deadlock in perf_event_release_kernel
testing current HEAD 8034e99d1a010a795b979582c0b2370584d8abf4
testing commit 8034e99d1a010a795b979582c0b2370584d8abf4
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 9ba7a05ad6f167c66655c7455d77e9bdd68a0032774acf461ddf751138554e6f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 29m0.938705329s (build: 22m3.571862842s, test: 6m26.467681285s)
the crash still happens on HEAD
commit msg: Linux 4.14.266
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1