bisecting fixing commit since 6b6446efedb27c2766745a04f9b5d4449f51391d building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d8969ceb1a09fccd3abafe34cf38855e9d74cd14815727dd42d9385e5b6a4a8f 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: crashed: WARNING in ieee80211_ibss_csa_beacon run #12: crashed: WARNING in ieee80211_ibss_csa_beacon run #13: crashed: WARNING in ieee80211_ibss_csa_beacon run #14: crashed: WARNING in ieee80211_ibss_csa_beacon run #15: crashed: WARNING in ieee80211_ibss_csa_beacon run #16: OK run #17: crashed: WARNING in ieee80211_ibss_csa_beacon run #18: crashed: WARNING in ieee80211_ibss_csa_beacon run #19: OK testing current HEAD 162b95d01320370b80cb2d5724cea4ae538ac740 testing commit 162b95d01320370b80cb2d5724cea4ae538ac740 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6db3df5fbf8b48f0fc8d84139640ecb9bd926e47a2a35987b9138fe04232431e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 32m42.198804116s (build: 20m20.470029534s, test: 11m54.036692955s) the crash still happens on HEAD commit msg: Linux 4.14.244 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout