bisecting fixing commit since c6db52a88798e5a0dfef80041ad4d33cc8cf04eb
building syzkaller on 2420d1bcbcd9f5d5893c1aab8096cce81721dac2
testing commit c6db52a88798e5a0dfef80041ad4d33cc8cf04eb with gcc (GCC) 8.4.1 20210217
kernel signature: 85c8f1e82d7c87ce9136b24ce347ab608abf56fd92b10a791569d94439be794e
run #0: crashed: KASAN: use-after-free Read in tasklet_action
run #1: crashed: KASAN: use-after-free Read in bcm_can_tx
run #2: crashed: WARNING: ODEBUG bug in enqueue_hrtimer
run #3: crashed: KASAN: use-after-free Read in tasklet_action
run #4: crashed: KASAN: use-after-free Read in bcm_can_tx
run #5: crashed: KASAN: use-after-free Read in bcm_tx_start_timer
run #6: crashed: KASAN: use-after-free Read in bcm_can_tx
run #7: crashed: KASAN: use-after-free Read in bcm_can_tx
run #8: crashed: KASAN: use-after-free Read in bcm_can_tx
run #9: crashed: KASAN: use-after-free Read in hrtimer_debug_hint
run #10: crashed: WARNING: ODEBUG bug in bcm_remove_op
run #11: crashed: KASAN: use-after-free Read in bcm_can_tx
run #12: crashed: KASAN: use-after-free Read in bcm_can_tx
run #13: crashed: KASAN: use-after-free Read in tasklet_action
run #14: crashed: KASAN: use-after-free Read in tasklet_action
run #15: crashed: KASAN: use-after-free Read in tasklet_action
run #16: crashed: KASAN: use-after-free Read in bcm_can_tx
run #17: crashed: KASAN: use-after-free Read in bcm_can_tx
run #18: OK
run #19: crashed: KASAN: use-after-free Read in bcm_can_tx
testing current HEAD 4e68c9b0763ff55eaa69d6e519f07515f1c9037b
testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b with gcc (GCC) 8.4.1 20210217
kernel signature: b4f7ed7dcf1bb666c7a9234d16d5d40cb665a77641c7408fa958ad779657002c
run #0: crashed: unregister_netdevice: waiting for DEV to become free
run #1: crashed: unregister_netdevice: waiting for DEV to become free
run #2: crashed: unregister_netdevice: waiting for DEV to become free
run #3: crashed: unregister_netdevice: waiting for DEV to become free
run #4: crashed: unregister_netdevice: waiting for DEV to become free
run #5: crashed: unregister_netdevice: waiting for DEV to become free
run #6: crashed: unregister_netdevice: waiting for DEV to become free
run #7: crashed: unregister_netdevice: waiting for DEV to become free
run #8: crashed: unregister_netdevice: waiting for DEV to become free
run #9: boot failed: failed to create instance: googleapi: Error 503: The service is currently unavailable., backendError
revisions tested: 2, total time: 31m36.10840888s (build: 15m59.368154496s, test: 15m9.73354869s)
the crash still happens on HEAD
commit msg: Linux 4.14.239
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