bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on e4b4d570a88c0d2e0420c6e21fc20d90564636b1 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 152721f131a263956ffb4c38e7e3cb06e3fe3f1c391081aaccf62508cc72a066 run #0: crashed: KASAN: use-after-free Read in rht_deferred_worker run #1: crashed: KASAN: use-after-free Read in rht_deferred_worker run #2: crashed: KASAN: use-after-free Read in rht_deferred_worker run #3: crashed: KASAN: use-after-free Read in rht_deferred_worker run #4: crashed: KASAN: use-after-free Read in rht_deferred_worker run #5: OK run #6: OK run #7: OK run #8: crashed: KASAN: use-after-free Read in rht_deferred_worker run #9: crashed: KASAN: use-after-free Read in rht_deferred_worker run #10: crashed: KASAN: use-after-free Read in rht_deferred_worker run #11: crashed: KASAN: use-after-free Read in rht_deferred_worker run #12: crashed: KASAN: use-after-free Read in rht_deferred_worker run #13: crashed: KASAN: use-after-free Read in rht_deferred_worker run #14: crashed: KASAN: use-after-free Read in rht_deferred_worker run #15: crashed: KASAN: use-after-free Read in rht_deferred_worker run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD a6ca7c65b1376f7bb14979cb745d3da73c8de948 testing commit a6ca7c65b1376f7bb14979cb745d3da73c8de948 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 64d1a9c6fa54ed4453997bcc1b0f270cf6bd7dd52fe7efc52376d964b39cc59f all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 30m27.105034287s (build: 14m57.419395606s, test: 14m59.560642375s) the crash still happens on HEAD commit msg: Linux 4.14.260 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout