bisecting fixing commit since c6db52a88798e5a0dfef80041ad4d33cc8cf04eb
building syzkaller on 2420d1bcbcd9f5d5893c1aab8096cce81721dac2
testing commit c6db52a88798e5a0dfef80041ad4d33cc8cf04eb
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c97901e2f113cad90b928b46e0818304135a6c4ae090de463c5cf9487ebe7ed9
run #0: crashed: KASAN: use-after-free Read in bcm_can_tx
run #1: crashed: KASAN: use-after-free Read in tasklet_action
run #2: crashed: KASAN: use-after-free Read in tasklet_action
run #3: crashed: KASAN: use-after-free Read in bcm_can_tx
run #4: crashed: WARNING: ODEBUG bug in bcm_remove_op
run #5: crashed: KASAN: use-after-free Read in bcm_can_tx
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 tasklet_action
run #9: crashed: KASAN: use-after-free Read in bcm_can_tx
run #10: crashed: KASAN: use-after-free Read in tasklet_action
run #11: crashed: WARNING: ODEBUG bug in enqueue_hrtimer
run #12: crashed: KASAN: use-after-free Read in tasklet_action
run #13: crashed: KASAN: use-after-free Read in bcm_can_tx
run #14: crashed: KASAN: use-after-free Read in tasklet_action
run #15: crashed: KASAN: use-after-free Read in bcm_can_tx
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: crashed: KASAN: use-after-free Read in tasklet_action
run #19: crashed: KASAN: use-after-free Read in tasklet_action
testing current HEAD 162b95d01320370b80cb2d5724cea4ae538ac740
testing commit 162b95d01320370b80cb2d5724cea4ae538ac740
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 37311fcc957ef8bca9b5b53a3fb12a8669024ecfda5513be5696227787a529e6
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 29m20.263340387s (build: 16m29.013059492s, test: 12m19.866809733s)
the crash still happens on HEAD
commit msg: Linux 4.14.244
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1