bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 9bbb77bd352f145edbb8b81bd9233efb58a572df981dc81f456c332d1484d2c2
run #0: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
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_sock_shutdown
run #4: crashed: BUG: corrupted list in l2cap_chan_put
run #5: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #6: crashed: BUG: corrupted list in l2cap_chan_put
run #7: crashed: BUG: corrupted list in l2cap_chan_put
run #8: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #9: crashed: KASAN: use-after-free Write in ex_handler_refcount
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_sock_shutdown
run #14: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
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: KASAN: use-after-free Read in l2cap_sock_shutdown
testing current HEAD 5f9f3b0057d5c5782985784ba0159b05b4083055
testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: cc11a2a96fea7216a9de81a88b7bf1a01f583c14fc025cb7f9fbfeabcba91ee7
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 34m16.77636166s (build: 21m12.987694054s, test: 12m37.299255799s)
the crash still happens on HEAD
commit msg: Linux 4.14.255
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1