bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 56b7ed0905ed24e4d92dd7d87086367f94226c805275b4672da99b9487220f1f
run #0: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: BUG: corrupted list in l2cap_chan_put
run #3: crashed: BUG: corrupted list in l2cap_chan_put
run #4: crashed: BUG: corrupted list in l2cap_chan_put
run #5: crashed: BUG: corrupted list in l2cap_chan_put
run #6: crashed: BUG: corrupted list in l2cap_chan_put
run #7: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
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: BUG: corrupted list in l2cap_chan_put
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: KASAN: use-after-free Read in l2cap_sock_shutdown
run #15: crashed: BUG: corrupted list in l2cap_chan_put
run #16: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #17: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #18: crashed: BUG: corrupted list in l2cap_chan_put
run #19: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
testing current HEAD f96eb53cbd76415edfba99c2cfa88567a885a428
testing commit f96eb53cbd76415edfba99c2cfa88567a885a428
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: 43e133d91ae90cd8b7acc10055b889126bf547d4b15d90db3d302ada6561cad2
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 36m52.800259557s (build: 23m37.011032924s, test: 12m44.890667701s)
the crash still happens on HEAD
commit msg: Linux 4.14.246
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1