bisecting fixing commit since 46914f96189be290174e378c6bf9ccadfdb9ca1e building syzkaller on 6972b10616d785401dea17cec890cca8916424a7 testing commit 46914f96189be290174e378c6bf9ccadfdb9ca1e compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 57e6b403d4814f6fe238332ce077972194aa9cfdf7704761dddf5cc05b2ab655 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 756db2ba8bde4ead58ceb54e9cbc71f526f9a98f testing commit 756db2ba8bde4ead58ceb54e9cbc71f526f9a98f compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: f0e67576b7db284cb8598625acb920fd4180cef0d30b72f9a7b790723de284e1 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 25m20.001822909s (build: 18m16.881738405s, test: 6m34.055983996s) the crash still happens on HEAD commit msg: Linux 4.14.249 crash: unregister_netdevice: waiting for DEV to become free can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout