bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207
building syzkaller on f54a5c0916af7d798b204eb70c484f154d69e0a3
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: d566525d66adb3e7ae2c9fcae1cfb433dac8693441ea9face2b80720853171c0
run #0: crashed: WARNING in mutex_destroy
run #1: crashed: WARNING in mutex_destroy
run #2: crashed: general protection fault in vgem_fence_attach_ioctl
run #3: crashed: WARNING in mutex_destroy
run #4: crashed: general protection fault in vgem_fence_attach_ioctl
run #5: crashed: KASAN: use-after-free Read in reservation_object_test_signaled_rcu
run #6: crashed: general protection fault in vgem_fence_attach_ioctl
run #7: crashed: WARNING in mutex_destroy
run #8: crashed: general protection fault in vgem_fence_attach_ioctl
run #9: crashed: WARNING in mutex_destroy
run #10: crashed: general protection fault in vgem_fence_attach_ioctl
run #11: crashed: general protection fault in vgem_fence_attach_ioctl
run #12: crashed: general protection fault in vgem_fence_attach_ioctl
run #13: crashed: WARNING in mutex_destroy
run #14: crashed: WARNING in mutex_destroy
run #15: crashed: WARNING in mutex_destroy
run #16: crashed: general protection fault in vgem_fence_attach_ioctl
run #17: crashed: general protection fault in vgem_fence_attach_ioctl
run #18: crashed: general protection fault in vgem_fence_attach_ioctl
run #19: crashed: general protection fault in vgem_fence_attach_ioctl
testing current HEAD 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85
testing commit 3d3abdc8ebd3c3082e4398fc73ceb4c852b66e85 with gcc (GCC) 8.4.1 20210217
kernel signature: d8cf4f4a16445670348653e14537e73feb725624d29b2a44890b632f79b65b0f
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 25m45.439349631s (build: 15m35.052273499s, test: 9m49.261477382s)
the crash still happens on HEAD
commit msg: Linux 4.14.236
crash: unregister_netdevice: waiting for DEV to become free
can: request_module (can-proto-0) failed.
can: request_module (can-proto-0) failed.
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1
Bluetooth: hci1 command 0x0409 tx timeout
Bluetooth: hci3 command 0x0409 tx timeout
Bluetooth: hci5 command 0x0409 tx timeout
Bluetooth: hci0 command 0x0409 tx timeout
Bluetooth: hci4 command 0x0409 tx timeout
Bluetooth: hci2 command 0x0409 tx timeout
Bluetooth: hci3 command 0x041b tx timeout
Bluetooth: hci1 command 0x041b tx timeout
Bluetooth: hci2 command 0x041b tx timeout
Bluetooth: hci4 command 0x041b tx timeout
Bluetooth: hci0 command 0x041b tx timeout
Bluetooth: hci5 command 0x041b tx timeout
Bluetooth: hci1 command 0x040f tx timeout
Bluetooth: hci3 command 0x040f tx timeout
Bluetooth: hci5 command 0x040f tx timeout
Bluetooth: hci0 command 0x040f tx timeout
Bluetooth: hci4 command 0x040f tx timeout
Bluetooth: hci2 command 0x040f tx timeout
Bluetooth: hci3 command 0x0419 tx timeout
Bluetooth: hci1 command 0x0419 tx timeout
Bluetooth: hci2 command 0x0419 tx timeout
Bluetooth: hci4 command 0x0419 tx timeout
Bluetooth: hci0 command 0x0419 tx timeout
Bluetooth: hci5 command 0x0419 tx timeout