bisecting fixing commit since cbfa1702aaf69b2311ea1b35e04f113c48368c67
building syzkaller on 4a77ae0bdc5cd75ebe88ce7c896aae6bbf457a29
testing commit cbfa1702aaf69b2311ea1b35e04f113c48368c67
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 9fd407c8c004379b4da78f28ce295db1718787e5ff81585950cc1f181337d758
run #0: crashed: general protection fault in vgem_fence_attach_ioctl
run #1: crashed: KASAN: use-after-free Read in reservation_object_reserve_shared
run #2: crashed: WARNING in mutex_destroy
run #3: crashed: general protection fault in vgem_fence_attach_ioctl
run #4: crashed: WARNING in mutex_destroy
run #5: crashed: general protection fault in vgem_fence_attach_ioctl
run #6: crashed: WARNING in mutex_destroy
run #7: crashed: general protection fault in vgem_fence_attach_ioctl
run #8: crashed: general protection fault in vgem_fence_attach_ioctl
run #9: crashed: general protection fault in vgem_fence_attach_ioctl
run #10: crashed: general protection fault in vgem_fence_attach_ioctl
run #11: crashed: WARNING in mutex_destroy
run #12: crashed: general protection fault in vgem_fence_attach_ioctl
run #13: crashed: general protection fault in vgem_fence_attach_ioctl
run #14: OK
run #15: OK
run #16: OK
run #17: crashed: KASAN: use-after-free Read in reservation_object_test_signaled_rcu
run #18: OK
run #19: OK
testing current HEAD dffb5c6ff09c51ed585e3e7665143df103867fc8
testing commit dffb5c6ff09c51ed585e3e7665143df103867fc8
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 55c964a4fcff038d0265d3e077833c908f4f699d563f01942f67e882c909dc0d
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 34m0.856696051s (build: 18m59.171717327s, test: 14m24.415343856s)
the crash still happens on HEAD
commit msg: Linux 4.14.280
crash: unregister_netdevice: waiting for DEV to become free
Bluetooth: hci0 command 0x0409 tx timeout
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci0 command 0x0419 tx timeout