bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on ed7d41c582d6f194ff35353d8bfdf7681dc0718e
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: 3a4c8e86157080256c347f4d2cfee8636ed09b06ce886c54a1b11129eacbbe40
run #0: crashed: INFO: task hung in blkdev_reread_part
run #1: crashed: INFO: task hung in lo_open
run #2: crashed: INFO: task hung in __blkdev_get
run #3: crashed: INFO: task hung in lo_open
run #4: crashed: INFO: task hung in blkdev_reread_part
run #5: crashed: INFO: task hung in lo_release
run #6: crashed: INFO: task hung in lo_open
run #7: crashed: INFO: task hung in lo_open
run #8: crashed: INFO: task hung in blkdev_reread_part
run #9: crashed: INFO: task hung in lo_open
run #10: crashed: INFO: task hung in lo_open
run #11: crashed: INFO: task hung in lo_open
run #12: crashed: INFO: task hung in lo_open
run #13: crashed: INFO: task hung in loop_control_ioctl
run #14: crashed: INFO: task hung in lo_open
run #15: crashed: INFO: task hung in lo_open
run #16: crashed: INFO: task hung in lo_open
run #17: crashed: INFO: task hung in lo_open
run #18: crashed: INFO: task hung in lo_open
run #19: crashed: INFO: task hung in __blkdev_get
testing current HEAD 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85
testing commit 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85 with gcc (GCC) 8.4.1 20210217
kernel signature: 7f7feda41340f47b5108ba60a47e5404e247858870db079da3aa98b26da461ea
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m31.287566554s (build: 14m50.655397972s, test: 10m14.945131552s)
the crash still happens on HEAD
commit msg: Linux 4.14.236
crash: unregister_netdevice: waiting for DEV to become free
can: request_module (can-proto-0) failed.
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout