bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207 building syzkaller on ecb594cb00c42ea45216948fc5ff94f76f77b977 testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: f95177dab7c5d121f0ec8ecdb52a81811babddeedaab2f7f3d6f6c238f8d3954 all runs: crashed: INFO: trying to register non-static key in ieee802154_del_device testing current HEAD 46914f96189be290174e378c6bf9ccadfdb9ca1e testing commit 46914f96189be290174e378c6bf9ccadfdb9ca1e compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c54ef4f8e7b43840259e5203672bb9bb5062fd573b506d1148873f716876ea0e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 24m56.868896348s (build: 18m4.317927907s, test: 6m29.741255576s) the crash still happens on HEAD commit msg: Linux 4.14.243 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1