bisecting fixing commit since 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a testing commit 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 50e1e38394552a86189894023cba0572cdf05c4225c9b6fb3159cd900b44039d all runs: crashed: general protection fault in hsr_netdev_notify testing current HEAD 8ea4f73cfa7e0555dc03aedde52db54a6587ab43 testing commit 8ea4f73cfa7e0555dc03aedde52db54a6587ab43 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 029cdd08074bb0ad3d606e4b07f140595ec13ef713556c6a508530ee5c27b385 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 27m52.095458963s (build: 20m50.421982709s, test: 6m26.193469774s) the crash still happens on HEAD commit msg: Linux 4.14.247 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 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 unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 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: hci5 command 0x0419 tx timeout