bisecting fixing commit since 1752938529c614a8ed4432ecce6ebc95d3b87207 building syzkaller on c104d4a3bfc1f83e7ed33b4dca70e099402ce39f testing commit 1752938529c614a8ed4432ecce6ebc95d3b87207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5050b1b1c37ea3610de91439ee38bbdf82569ba4dd519122ed8692b6309b7d18 all runs: crashed: INFO: task hung in sync_inodes_sb testing current HEAD 9dfbac0e6b8600043de8dc85ed072f5f1342dc15 testing commit 9dfbac0e6b8600043de8dc85ed072f5f1342dc15 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 8aed9525b3ba661323f82bc2c40f5927cc045f02b60f4cbc77f5ac90f0489da3 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 31m21.82862703s (build: 20m38.946656179s, test: 10m10.735548212s) the crash still happens on HEAD commit msg: Linux 4.14.258 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: hci2 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 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 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout