bisecting fixing commit since 1752938529c614a8ed4432ecce6ebc95d3b87207 building syzkaller on b1c228e1773559f05fa98950902ab025d6ab946e testing commit 1752938529c614a8ed4432ecce6ebc95d3b87207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 20bb87a62e8b4af6b4924ec243f5852b11027b08622b46ca10c4cce06971fa44 run #0: crashed: kernel BUG in corrupted run #1: crashed: kernel BUG in ipgre_xmit run #2: crashed: kernel BUG in ipgre_xmit run #3: crashed: kernel BUG in ipgre_xmit run #4: crashed: kernel BUG in ipgre_xmit run #5: crashed: kernel BUG in ipgre_xmit run #6: crashed: kernel BUG in ipgre_xmit run #7: crashed: kernel BUG in ipgre_xmit run #8: crashed: kernel BUG in ipgre_xmit run #9: crashed: kernel BUG in ipgre_xmit run #10: crashed: kernel BUG in ipgre_xmit run #11: crashed: kernel BUG in ipgre_xmit run #12: crashed: kernel BUG in ipgre_xmit run #13: crashed: kernel BUG in ipgre_xmit run #14: crashed: kernel BUG in ipgre_xmit run #15: crashed: kernel BUG in ipgre_xmit run #16: crashed: kernel BUG in ipgre_xmit run #17: crashed: kernel BUG in ipgre_xmit run #18: crashed: kernel BUG in ipgre_xmit run #19: crashed: kernel BUG in ipgre_xmit testing current HEAD 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e testing commit 0447aa205abe1c0c016b4f7fa9d7c08d920b5c8e compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b256a17b3e173d1e976644f860d935e730dd8ece688e045b2d5adf925538eb2f all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m21.393137699s (build: 16m35.390768106s, test: 6m11.08973732s) the crash still happens on HEAD commit msg: Linux 4.14.254 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci4 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: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 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 Bluetooth: hci4 command 0x0419 tx timeout