bisecting fixing commit since 8961076ed318dfd22aa357b41589f07bf67e73b6
building syzkaller on 0767f13fbd87c99aea7893eb64199b76be42cd61
testing commit 8961076ed318dfd22aa357b41589f07bf67e73b6 with gcc (GCC) 8.4.1 20210217
kernel signature: 527fc615b8aedb6f1fc9095555267d001bd91ee5c0106ae241ad68c8e851b37e
run #0: crashed: possible deadlock in strp_sock_lock
run #1: crashed: possible deadlock in kcm_ioctl
run #2: crashed: possible deadlock in kcm_ioctl
run #3: crashed: possible deadlock in strp_sock_lock
run #4: crashed: possible deadlock in kcm_ioctl
run #5: crashed: possible deadlock in kcm_ioctl
run #6: crashed: possible deadlock in kcm_ioctl
run #7: crashed: possible deadlock in kcm_ioctl
run #8: crashed: possible deadlock in strp_sock_lock
run #9: crashed: possible deadlock in kcm_ioctl
run #10: crashed: possible deadlock in strp_sock_lock
run #11: crashed: possible deadlock in strp_sock_lock
run #12: crashed: possible deadlock in kcm_ioctl
run #13: crashed: possible deadlock in kcm_ioctl
run #14: crashed: possible deadlock in kcm_ioctl
run #15: crashed: possible deadlock in strp_sock_lock
run #16: crashed: possible deadlock in kcm_ioctl
run #17: crashed: possible deadlock in kcm_ioctl
run #18: crashed: possible deadlock in kcm_ioctl
run #19: crashed: possible deadlock in strp_sock_lock
testing current HEAD a6b2dae3ee3a3f9f4db3fab5b4b9e493fecf4acd
testing commit a6b2dae3ee3a3f9f4db3fab5b4b9e493fecf4acd with gcc (GCC) 8.4.1 20210217
kernel signature: 4c435ea629961b9dc8d3bc92f9a10a105a5a5caf07aeea5c6defec872052aa73
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m0.45452252s (build: 18m58.416839878s, test: 6m21.615652103s)
the crash still happens on HEAD
commit msg: Linux 4.14.235
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout