bisecting fixing commit since 670d6552eda8ff0c5f396d3d6f0174237917c66c
building syzkaller on a8529b82fb3bb45832b08a099e7eb51707da9b37
testing commit 670d6552eda8ff0c5f396d3d6f0174237917c66c
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 580a241d7f1daa6fdf16e6ac7a896ca00c2dd8b78d688f2fa6bbe2c87c703244
all runs: crashed: KASAN: use-after-free Read in ip_tunnel_xmit
testing current HEAD 66722c42ec916e92cadda46316f8f6e3fdcaedc6
testing commit 66722c42ec916e92cadda46316f8f6e3fdcaedc6
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: f4c954e939f80adb9428b696308db469bc1ed00fc32efed97ea0a8345ec351ea
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 24m53.867395372s (build: 17m56.969063469s, test: 6m34.072210639s)
the crash still happens on HEAD
commit msg: Linux 4.14.256
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci5 command 0x0419 tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout