bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on bc5434be1a615eca6d901c20b026712bd9697fd4
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: aa0bec391269a31da5dedcfc72796275dcdf13838dc4f799fef9b33a5763b048
run #0: crashed: KASAN: use-after-free Read in nbd_put
run #1: crashed: KASAN: use-after-free Read in nbd_put
run #2: crashed: KASAN: use-after-free Read in nbd_put
run #3: crashed: WARNING: refcount bug in nbd_put
run #4: crashed: KASAN: use-after-free Read in nbd_put
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Read in nbd_put
run #7: crashed: KASAN: use-after-free Read in nbd_put
run #8: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #9: crashed: WARNING: refcount bug in nbd_put
run #10: crashed: WARNING: refcount bug in nbd_put
run #11: crashed: WARNING: refcount bug in nbd_put
run #12: crashed: KASAN: use-after-free Read in nbd_put
run #13: crashed: KASAN: use-after-free Read in nbd_put
run #14: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #15: crashed: WARNING: refcount bug in nbd_put
run #16: crashed: KASAN: use-after-free Read in nbd_put
run #17: crashed: KASAN: use-after-free Read in nbd_put
run #18: crashed: KASAN: use-after-free Read in nbd_put
run #19: crashed: KASAN: use-after-free Read in nbd_put
testing current HEAD cfb41ef9deb1e6572ac218ddfcec9567e5d1c101
testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 with gcc (GCC) 8.4.1 20210217
kernel signature: 71f9d5a2a5b02191432547b3d9d655b5223cb360dad852aab494d7510e08148a
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m24.851981931s (build: 14m38.608352231s, test: 6m26.344107111s)
the crash still happens on HEAD
commit msg: Linux 4.14.237
crash: unregister_netdevice: waiting for DEV to become free
can: request_module (can-proto-0) failed.
can: request_module (can-proto-0) failed.
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci0 command 0x0419 tx timeout