bisecting fixing commit since 2d2791fce891fc20709232d49a6bae075b9a77f8
building syzkaller on a57db36fe48aa500618c2eac3b38c27afe6d290f
testing commit 2d2791fce891fc20709232d49a6bae075b9a77f8 with gcc (GCC) 8.4.1 20210217
kernel signature: 870d23f15aa39e5d628a2cb3883cfdec77ac632046beab40b9e945efd4e2f51e
all runs: crashed: KASAN: use-after-free Read in disk_unblock_events
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 91666678ab5b3b215268f14b1c766385864121ec916c36d2f1eb43be9b83264b
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 24m56.84489575s (build: 18m13.660397994s, test: 6m17.426039151s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout