bisecting fixing commit since 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a testing commit 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d3441a383ddce92c44c9d98133d035c420a854a120c087c0a74a2d20688f5036 all runs: crashed: KASAN: use-after-free Read in f2fs_evict_inode testing current HEAD af48f51cb5934738a3ee97e951d7dededf029488 testing commit af48f51cb5934738a3ee97e951d7dededf029488 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: bd8b21b30f0dc653fcb21ee66c096f1bb0249c282f323832d4dab462c7720d80 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 25m35.39550968s (build: 17m56.611060718s, test: 7m5.21463524s) the crash still happens on HEAD commit msg: Linux 4.14.271 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: hci5 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 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: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout