bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207 building syzkaller on bc5434be1a615eca6d901c20b026712bd9697fd4 testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 290bd01b66e590d3501adc1994afb41021df480bc127ae7f50176363017ae402 run #0: crashed: WARNING: ODEBUG bug in netdev_freemem run #1: crashed: SYZFAIL: output overflow run #2: crashed: SYZFAIL: output overflow run #3: crashed: SYZFAIL: output overflow run #4: crashed: SYZFAIL: output overflow run #5: crashed: SYZFAIL: output overflow run #6: crashed: SYZFAIL: output overflow run #7: crashed: SYZFAIL: output overflow run #8: crashed: SYZFAIL: output overflow run #9: crashed: SYZFAIL: output overflow run #10: crashed: SYZFAIL: output overflow run #11: crashed: SYZFAIL: output overflow run #12: crashed: SYZFAIL: output overflow run #13: crashed: SYZFAIL: output overflow run #14: crashed: SYZFAIL: output overflow run #15: crashed: SYZFAIL: output overflow run #16: crashed: SYZFAIL: output overflow run #17: crashed: SYZFAIL: output overflow run #18: crashed: SYZFAIL: output overflow run #19: crashed: SYZFAIL: output overflow testing current HEAD 74766a973637a02c32c04c1c6496e114e4855239 testing commit 74766a973637a02c32c04c1c6496e114e4855239 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a3deafa9b8703ca74c19c9e1e013a55c23b5ead4088d6d674cbcde869394f8ec all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m4.645741793s (build: 14m18.891620105s, test: 8m22.734115648s) the crash still happens on HEAD commit msg: Linux 4.14.275 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 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: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout