bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on bc5434be1a615eca6d901c20b026712bd9697fd4
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 767925855dd568d97dcacd9b653608d81f248b6ee847a23be881b78d7d6f2eda
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: KASAN: use-after-free Read in nbd_put
run #4: crashed: KASAN: use-after-free Read in nbd_put
run #5: crashed: KASAN: use-after-free Read in nbd_put
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 Read in nbd_put
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #10: crashed: KASAN: use-after-free Read 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: KASAN: use-after-free Write in ex_handler_refcount
run #16: crashed: KASAN: use-after-free Read in nbd_put
run #17: crashed: KASAN: use-after-free Write in ex_handler_refcount
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 f96eb53cbd76415edfba99c2cfa88567a885a428
testing commit f96eb53cbd76415edfba99c2cfa88567a885a428
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 19b4435d7025f34dd86a5479c0df90c30c7d655718e51c269126a35b243d3898
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m7.477092439s (build: 18m38.150216194s, test: 6m3.562516127s)
the crash still happens on HEAD
commit msg: Linux 4.14.246
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout