bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: ce6f457a0b233721e025fc401bab41e959f3f2b664bb63509670cb8fb54c1fd2 all runs: crashed: WARNING in __rate_control_send_low testing current HEAD dffb5c6ff09c51ed585e3e7665143df103867fc8 testing commit dffb5c6ff09c51ed585e3e7665143df103867fc8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 8cf709fd86588c376ae595e7c138cdf7848593df9883b4f1b2a2085dd65c198b all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m29.573216145s (build: 15m31.340299648s, test: 6m32.60872212s) the crash still happens on HEAD commit msg: Linux 4.14.280 crash: unregister_netdevice: waiting for DEV to become free IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready Bluetooth: hci0 command 0x0409 tx timeout 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: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout