bisecting fixing commit since 5b7a52cd2eef952cee8a72512ef370bcdef46636
building syzkaller on 94942294277bf7550b12322d282159551521258b
testing commit 5b7a52cd2eef952cee8a72512ef370bcdef46636 with gcc (GCC) 8.4.1 20210217
kernel signature: 4a3d19d487cb2480f0bcad41faf6580c4ed7ff17b71d6920ec5e63f29f1548ab
run #0: crashed: possible deadlock in __get_super
run #1: crashed: possible deadlock in __get_super
run #2: crashed: possible deadlock in __get_super
run #3: crashed: possible deadlock in __get_super
run #4: crashed: possible deadlock in __get_super
run #5: crashed: possible deadlock in blkdev_put
run #6: crashed: possible deadlock in __get_super
run #7: crashed: possible deadlock in __get_super
run #8: crashed: possible deadlock in blkdev_put
run #9: crashed: possible deadlock in __get_super
run #10: crashed: possible deadlock in blkdev_put
run #11: crashed: possible deadlock in __get_super
run #12: crashed: possible deadlock in __get_super
run #13: crashed: possible deadlock in __get_super
run #14: crashed: INFO: task hung in blkdev_put
run #15: crashed: INFO: task hung in blkdev_put
run #16: crashed: INFO: task hung in blkdev_put
run #17: crashed: INFO: task hung in blkdev_put
run #18: crashed: INFO: task hung in __get_super
run #19: crashed: INFO: task hung in blkdev_put
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 70cd3d3788a87d57a8fdb4ec5a792475d1152d89199f59f4973a8bfdb407ca48
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m4.215643213s (build: 14m55.899109115s, test: 9m46.108587242s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci1 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: hci2 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout