bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on e4b4d570a88c0d2e0420c6e21fc20d90564636b1 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 68bf76f58527f07b5b8f4439bfc191a5aeef9c343ce24ddfd360d12b1212d3e1 run #0: crashed: KASAN: use-after-free Read in rht_deferred_worker run #1: crashed: KASAN: use-after-free Read in rht_deferred_worker run #2: crashed: KASAN: use-after-free Read in rht_deferred_worker run #3: crashed: KASAN: use-after-free Read in rht_deferred_worker run #4: crashed: KASAN: use-after-free Read in rht_deferred_worker run #5: crashed: KASAN: use-after-free Read in rht_deferred_worker run #6: crashed: KASAN: use-after-free Read in rht_deferred_worker run #7: crashed: KASAN: use-after-free Read in rht_deferred_worker run #8: crashed: KASAN: use-after-free Read in rht_deferred_worker run #9: crashed: KASAN: use-after-free Read in rht_deferred_worker run #10: crashed: KASAN: use-after-free Read in rht_deferred_worker run #11: crashed: KASAN: use-after-free Read in rht_deferred_worker run #12: crashed: KASAN: use-after-free Read in rht_deferred_worker run #13: crashed: KASAN: use-after-free Read in rht_deferred_worker run #14: crashed: KASAN: use-after-free Read in rht_deferred_worker run #15: crashed: KASAN: use-after-free Read in rht_deferred_worker run #16: crashed: KASAN: use-after-free Read in rht_deferred_worker run #17: crashed: KASAN: use-after-free Read in rht_deferred_worker run #18: OK run #19: OK testing current HEAD b8f3be299d5176348b15cc59d55b85faa3dece68 testing commit b8f3be299d5176348b15cc59d55b85faa3dece68 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 250d8531a9fc085fe5a40fc40fa59c5c1f656e0dfda510b018f768744fbe6dd1 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 29m56.157001599s (build: 14m47.690119137s, test: 14m34.979343285s) the crash still happens on HEAD commit msg: Linux 4.14.282 crash: unregister_netdevice: waiting for DEV to become free IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout