bisecting fixing commit since fbc5fe7a54d02e11972e3b2a5ddb6ffc88162c8f building syzkaller on 0ecb9746a701be4544b845514a31a21cce92cc79 testing commit fbc5fe7a54d02e11972e3b2a5ddb6ffc88162c8f compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d1e97ba7576f50737ada559f7701189c07386caab37dac82af7b2977aaaf0691 run #0: crashed: general protection fault in corrupted run #1: crashed: general protection fault in cdev_del run #2: crashed: general protection fault in cdev_del run #3: crashed: general protection fault in corrupted run #4: crashed: general protection fault in cdev_del run #5: crashed: general protection fault in gsmld_close run #6: crashed: general protection fault in cdev_del run #7: crashed: general protection fault in cdev_del run #8: crashed: general protection fault in cdev_del run #9: crashed: general protection fault in cdev_del run #10: crashed: general protection fault in corrupted run #11: crashed: general protection fault in cdev_del run #12: crashed: general protection fault in cdev_del run #13: crashed: general protection fault in cdev_del run #14: crashed: general protection fault in cdev_del run #15: crashed: general protection fault in cdev_del run #16: crashed: general protection fault in cdev_del run #17: crashed: general protection fault in cdev_del run #18: crashed: general protection fault in cdev_del run #19: crashed: general protection fault in cdev_del testing current HEAD ed99bf0e81b558df39f7db2fa96d0228be4198c6 testing commit ed99bf0e81b558df39f7db2fa96d0228be4198c6 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c9985fc9ef029aad04b5d237bfb1a7c9f1764e589bcea899efb7b2db794b2dc7 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 28m55.174265268s (build: 21m24.535837529s, test: 6m33.406788833s) the crash still happens on HEAD commit msg: Linux 4.14.250 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1