bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on bc5434be1a615eca6d901c20b026712bd9697fd4
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 8deed2b32f73d879fb87d09a9ce834d940bfb6345d3433ffbfded399187c4c0a
run #0: crashed: WARNING: refcount bug 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 Write in ex_handler_refcount
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: WARNING: refcount bug 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: KASAN: use-after-free Write in ex_handler_refcount
run #10: crashed: KASAN: use-after-free Read in nbd_put
run #11: crashed: KASAN: use-after-free Write in ex_handler_refcount
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 Read in nbd_put
run #15: crashed: KASAN: use-after-free Read in nbd_put
run #16: crashed: WARNING: refcount bug 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 5f9f3b0057d5c5782985784ba0159b05b4083055
testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 4619015962baac8398729c4c59e42d8051c1d99d86960d44944dbb186bd2db19
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 21m15.776060451s (build: 14m20.919153526s, test: 6m32.060532457s)
the crash still happens on HEAD
commit msg: Linux 4.14.255
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci0 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: hci5 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout