bisecting fixing commit since 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a testing commit 2c8a3fceddf0dd87f278e7a5e01350f86f844b1c compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 26727d0921813e365b87e660ede72fbe20d9c2f453abd94889bfed452c7e195a all runs: crashed: KASAN: use-after-free Read in f2fs_evict_inode testing current HEAD c01d4d1b885d96a7c8c27d629abeb918ca897dbe testing commit c01d4d1b885d96a7c8c27d629abeb918ca897dbe compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: ca0c41db4abd7d344a79013203792ccb02f4d006d67e82d415c1b0c46ad72393 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 26m27.689704425s (build: 18m45.040649054s, test: 7m3.8223603s) the crash still happens on HEAD commit msg: Linux 4.14.257 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci1 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: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 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: hci1 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout