bisecting fixing commit since 0bddd227f3dc55975e2b8dfa7fc6f959b062a2c7
building syzkaller on bc238812ae6d1f5a7e99ff60b5b3089a73f1cfb3
testing commit 0bddd227f3dc55975e2b8dfa7fc6f959b062a2c7 with gcc (GCC) 8.4.1 20210217
kernel signature: bf492e817354b874897b1bd9a996982df10917e6213b1970c606a30cf4fe6d94
run #0: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #1: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #2: crashed: unregister_netdevice: waiting for DEV to become free
run #3: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #4: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #5: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #6: crashed: general protection fault in free_netdev
run #7: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #8: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #9: crashed: general protection fault in free_netdev
run #10: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #11: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #12: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #13: crashed: unregister_netdevice: waiting for DEV to become free
run #14: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #15: crashed: KASAN: use-after-free Read in netdevice_event_work_handler
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
testing commit fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 with gcc (GCC) 10.2.1 20210217
kernel signature: fdce1ebc6a06e168573b64032272962a49a5a9f92f72a2c80d874082827e9020
run #0: crashed: unregister_netdevice: waiting for DEV to become free
run #1: crashed: unregister_netdevice: waiting for DEV to become free
run #2: crashed: unregister_netdevice: waiting for DEV to become free
run #3: crashed: unregister_netdevice: waiting for DEV to become free
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
reproducer seems to be flaky
Reproducer flagged being flaky
revisions tested: 2, total time: 36m28.330491234s (build: 13m4.189802242s, test: 22m31.128974374s)
the crash still happens on HEAD
commit msg: Linux 5.12-rc1
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for sit0 to become free. Usage count = -1