bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 2103e379c5ad86c8c46d4d926f488c5950b2ae3f8cc868eb9bd8672e69cf0f48
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: BUG: corrupted list in l2cap_chan_put
run #3: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #4: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #7: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #8: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #9: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #10: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #11: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #12: crashed: BUG: corrupted list in l2cap_chan_put
run #13: crashed: KASAN: use-after-free Read in l2cap_chan_put
run #14: crashed: BUG: corrupted list in l2cap_chan_put
run #15: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #16: crashed: BUG: corrupted list in l2cap_chan_put
run #17: crashed: BUG: corrupted list in l2cap_chan_put
run #18: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #19: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
testing current HEAD f6b016a9d961296d2db609d0259654371625e22e
testing commit f6b016a9d961296d2db609d0259654371625e22e
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 017dc70e510272a94878bc2fc4a5fe736978a7bce54db87e135cb763f862e4ef
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 32m0.696054549s (build: 18m39.923988356s, test: 12m48.697437159s)
the crash still happens on HEAD
commit msg: Linux 4.14.251
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1