bisecting fixing commit since f79dc86058bc0c8317eea2a0f968382c6ffb0cfb
building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3
testing commit f79dc86058bc0c8317eea2a0f968382c6ffb0cfb with gcc (GCC) 8.4.1 20210217
kernel signature: fd008972c47e5bfd1bb0155de36bb6d345fdcdc8ac38afef3b4bbd67454586dd
run #0: crashed: INFO: task hung in lo_ioctl
run #1: crashed: INFO: task hung in __blkdev_get
run #2: crashed: INFO: task hung in __blkdev_get
run #3: crashed: INFO: task hung in lo_ioctl
run #4: crashed: INFO: task hung in __blkdev_get
run #5: crashed: INFO: task hung in lo_ioctl
run #6: crashed: INFO: task hung in __get_super
run #7: crashed: INFO: task hung in lo_ioctl
run #8: crashed: INFO: task hung in __get_super
run #9: crashed: INFO: task hung in __get_super
run #10: crashed: INFO: task hung in lo_ioctl
run #11: crashed: INFO: task hung in __blkdev_get
run #12: crashed: INFO: task hung in __blkdev_get
run #13: crashed: INFO: task hung in __get_super
run #14: crashed: INFO: task hung in __blkdev_get
run #15: crashed: INFO: task hung in lo_ioctl
run #16: crashed: INFO: task hung in __blkdev_get
run #17: crashed: INFO: task hung in lo_ioctl
run #18: crashed: INFO: task hung in lo_ioctl
run #19: crashed: INFO: task hung in __get_super
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: d404c3af2f8a639a1a0189b9c03d5402f9e77a3aebb94ca83c6f114af4f3a29b
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m42.668382589s (build: 20m1.240959649s, test: 9m59.235955079s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout