bisecting fixing commit since 6b6446efedb27c2766745a04f9b5d4449f51391d building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5b36f32d9ce5f993b6d34e094030c14c98e410632e797dbdcea12549c46cd9f2 run #0: crashed: WARNING in account_page_dirtied run #1: crashed: WARNING in account_page_dirtied run #2: crashed: WARNING in account_page_dirtied run #3: crashed: WARNING in account_page_dirtied run #4: crashed: WARNING in account_page_dirtied run #5: crashed: WARNING in account_page_dirtied run #6: crashed: WARNING in corrupted run #7: crashed: WARNING in account_page_dirtied run #8: crashed: WARNING in account_page_dirtied run #9: crashed: WARNING in account_page_dirtied run #10: crashed: WARNING in account_page_dirtied run #11: crashed: WARNING in account_page_dirtied run #12: crashed: WARNING in account_page_dirtied run #13: crashed: WARNING in account_page_dirtied run #14: crashed: WARNING in account_page_dirtied run #15: crashed: WARNING in account_page_dirtied run #16: crashed: WARNING in account_page_dirtied run #17: crashed: WARNING in account_page_dirtied run #18: crashed: WARNING in account_page_dirtied run #19: crashed: WARNING in account_page_dirtied testing current HEAD f11944f1aa1cda3fd8b4edc71e3cf9dceb40234f testing commit f11944f1aa1cda3fd8b4edc71e3cf9dceb40234f compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 38daee43995cd7dce36061e3763078b6825094c5ce52320a43567c41960e43c3 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 28m45.06196258s (build: 21m33.364349214s, test: 6m34.818480998s) the crash still happens on HEAD commit msg: Linux 4.14.248 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout