bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 3b7ebc4106b9942726481d7e19d9ffac80cee1d6db96f4a9aaef91240969612d
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #2: crashed: BUG: corrupted list in l2cap_chan_put
run #3: crashed: KASAN: use-after-free Read in l2cap_chan_put
run #4: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #5: crashed: BUG: corrupted list in l2cap_chan_put
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: BUG: corrupted list in l2cap_chan_put
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: KASAN: use-after-free Read in l2cap_sock_shutdown
run #13: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
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: KASAN: use-after-free Read in l2cap_sock_shutdown
run #18: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #19: crashed: BUG: corrupted list in l2cap_chan_put
testing current HEAD 964f3712e6a7447d9d3203f2be3f6c50e78ea179
testing commit 964f3712e6a7447d9d3203f2be3f6c50e78ea179
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 42da2476f1dab2ca4dba8ac7f882019817cb3a16690820628dffc53866fe7532
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 30m54.350248151s (build: 16m45.097052299s, test: 13m34.125286033s)
the crash still happens on HEAD
commit msg: Linux 4.14.240
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1