bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75
building syzkaller on 28ac5c9e93a44c3eb145195ffb55591be58ef510
testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: a3466b7699c4b5ea25b0221601fc83f1bb0e3e3a3ea8a782cfaad07bd523cdee
run #0: crashed: BUG: corrupted list in l2cap_chan_put
run #1: crashed: BUG: corrupted list in l2cap_chan_put
run #2: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #3: crashed: BUG: corrupted list in l2cap_chan_put
run #4: crashed: BUG: corrupted list in l2cap_chan_put
run #5: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #6: crashed: KASAN: use-after-free Write in ex_handler_refcount
run #7: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #8: crashed: BUG: corrupted list in l2cap_chan_put
run #9: crashed: KASAN: use-after-free Read in l2cap_sock_shutdown
run #10: crashed: KASAN: use-after-free Write in l2cap_chan_create
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: BUG: corrupted list in l2cap_chan_put
run #14: crashed: BUG: corrupted list in l2cap_chan_put
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 8034e99d1a010a795b979582c0b2370584d8abf4
testing commit 8034e99d1a010a795b979582c0b2370584d8abf4
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: db79a8e85ede015a2dc361e7b511c334c583e1795ad3069ec3a29dff21cf5442
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 38m1.975048036s (build: 24m40.186976269s, test: 12m37.354851851s)
the crash still happens on HEAD
commit msg: Linux 4.14.266
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1