bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on e4b4d570a88c0d2e0420c6e21fc20d90564636b1 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 82e1976e49a10859ce21d81e6017823d791e9f0706f670310aa474f2b91a8226 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: crashed: KASAN: use-after-free Read in rht_deferred_worker run #6: crashed: KASAN: use-after-free Read in rht_deferred_worker run #7: crashed: KASAN: use-after-free Read in rht_deferred_worker 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: OK run #16: OK run #17: crashed: KASAN: use-after-free Read in rht_deferred_worker run #18: crashed: KASAN: use-after-free Read in rht_deferred_worker run #19: crashed: KASAN: use-after-free Read in rht_deferred_worker testing current HEAD 1048779a1d7dcf0b5c150188decafa21c19821e4 testing commit 1048779a1d7dcf0b5c150188decafa21c19821e4 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 90ddfc39eb71fbe01946b6c92e4cb0b328dd7b30ea6273ecb50fa7d0586dc920 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 27m51.629589226s (build: 14m5.460898664s, test: 13m14.829801571s) the crash still happens on HEAD commit msg: Linux 4.14.287 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout