bisecting fixing commit since 6b6446efedb27c2766745a04f9b5d4449f51391d building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d with gcc (GCC) 8.4.1 20210217 kernel signature: 23a9d55ae69d4801819bf946a5078c05767ea4e25dac52d4128a613a584ee6a1 run #0: crashed: WARNING in ieee80211_ibss_csa_beacon run #1: crashed: WARNING in ieee80211_ibss_csa_beacon run #2: crashed: WARNING in ieee80211_ibss_csa_beacon run #3: crashed: WARNING in ieee80211_ibss_csa_beacon run #4: crashed: WARNING in ieee80211_ibss_csa_beacon run #5: crashed: WARNING in ieee80211_ibss_csa_beacon run #6: crashed: WARNING in ieee80211_ibss_csa_beacon run #7: crashed: WARNING in ieee80211_ibss_csa_beacon run #8: crashed: WARNING in ieee80211_ibss_csa_beacon run #9: crashed: WARNING in ieee80211_ibss_csa_beacon run #10: crashed: WARNING in ieee80211_ibss_csa_beacon run #11: OK run #12: crashed: WARNING in ieee80211_ibss_csa_beacon run #13: OK run #14: crashed: WARNING in ieee80211_ibss_csa_beacon run #15: OK run #16: crashed: WARNING in __cfg80211_ibss_joined run #17: crashed: WARNING in ieee80211_ibss_csa_beacon run #18: OK run #19: crashed: WARNING in ieee80211_ibss_csa_beacon testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217 kernel signature: 4a35248a7cbb461cfe432443fb5c70bf4d98d4c96f3b0eb64d61c84fe4754a11 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 34m48.967193397s (build: 21m59.405971819s, test: 12m17.268817455s) the crash still happens on HEAD commit msg: Linux 4.14.237 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 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: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout