bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on a2eb125d4d18e3e21b7dea6e857d2ffa288218e0
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 328a5f6736c110468178102716cc71112ce4492ffd3b7ea099715bf81f7477c8
run #0: crashed: possible deadlock in tty_port_close_start
run #1: crashed: possible deadlock in console_unlock
run #2: crashed: possible deadlock in console_unlock
run #3: crashed: possible deadlock in tty_port_close_start
run #4: crashed: possible deadlock in console_unlock
run #5: crashed: possible deadlock in tty_port_close_start
run #6: crashed: possible deadlock in tty_port_close_start
run #7: crashed: possible deadlock in console_unlock
run #8: crashed: possible deadlock in console_unlock
run #9: crashed: possible deadlock in console_unlock
run #10: crashed: possible deadlock in console_unlock
run #11: crashed: possible deadlock in console_unlock
run #12: crashed: possible deadlock in tty_port_close_start
run #13: crashed: possible deadlock in tty_port_close_start
run #14: crashed: possible deadlock in tty_port_close_start
run #15: crashed: possible deadlock in console_unlock
run #16: crashed: possible deadlock in console_unlock
run #17: crashed: possible deadlock in console_unlock
run #18: crashed: possible deadlock in console_unlock
run #19: crashed: possible deadlock in console_unlock
testing current HEAD 5f9f3b0057d5c5782985784ba0159b05b4083055
testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 87892311f42158b38d66f3b5b3e87731d8c2305e1b8d8f4987bfad4e46a99a48
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m10.854705394s (build: 14m13.83921319s, test: 6m33.73582667s)
the crash still happens on HEAD
commit msg: Linux 4.14.255
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci4 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: hci0 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout