bisecting fixing commit since 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 1996b762bb78db5d54a687dced248393cbe614c62d2bb5a21b1c45cb69f94590 all runs: crashed: general protection fault in skb_release_data testing current HEAD 5f9f3b0057d5c5782985784ba0159b05b4083055 testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 9211207e18dd57aae58622e190c4b108fae1b079e99cf35b28f8b8e987ce792e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 27m21.420978354s (build: 19m41.629215902s, test: 6m57.375139943s) the crash still happens on HEAD commit msg: Linux 4.14.255 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout