bisecting fixing commit since 0cc244011f40280b78fc344d5c2aac5a0c659f77
building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9
testing commit 0cc244011f40280b78fc344d5c2aac5a0c659f77 with gcc (GCC) 8.4.1 20210217
kernel signature: d3ef5ccc00c185e444ef7a1cf6d419224f0fbb2e0b57d73df34231442243ff7c
run #0: crashed: KASAN: use-after-free Read in nbd_put
run #1: crashed: WARNING: refcount bug in nbd_put
run #2: crashed: KASAN: use-after-free Read in nbd_put
run #3: crashed: WARNING: refcount bug in nbd_put
run #4: crashed: KASAN: use-after-free Read in nbd_put
run #5: crashed: KASAN: use-after-free Read in nbd_put
run #6: crashed: KASAN: use-after-free Read in nbd_put
run #7: crashed: KASAN: use-after-free Read in nbd_put
run #8: crashed: KASAN: use-after-free Read in nbd_put
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #10: crashed: KASAN: use-after-free Read in nbd_put
run #11: crashed: WARNING: refcount bug in nbd_put
run #12: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #13: crashed: KASAN: use-after-free Read in nbd_put
run #14: crashed: KASAN: use-after-free Read in nbd_put
run #15: crashed: KASAN: use-after-free Read in nbd_put
run #16: crashed: KASAN: use-after-free Read in nbd_put
run #17: crashed: WARNING: refcount bug in nbd_put
run #18: crashed: KASAN: use-after-free Read in nbd_put
run #19: crashed: KASAN: use-after-free Read in nbd_put
testing current HEAD 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85
testing commit 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85 with gcc (GCC) 8.4.1 20210217
kernel signature: fb12def54cc6282d45c466de5d778d73f1c4ae81181cd3f1f74d64b3c6530cba
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m39.449918684s (build: 18m31.912562333s, test: 6m31.446389179s)
the crash still happens on HEAD
commit msg: Linux 4.14.236
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci0 command 0x0419 tx timeout