bisecting fixing commit since f4cc0ed9b2c72687303b035379c5824a02224354 building syzkaller on 7509bf360eba1461ac6059e4cacfbc29c9d2d4c7 testing commit f4cc0ed9b2c72687303b035379c5824a02224354 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 97dda8511b9a7c8748f7f9eb3bbe21d3516d5780feed6bc9cd9c9b43c853f50f run #0: crashed: BUG: soft lockup in corrupted run #1: crashed: BUG: soft lockup in sendfile64 run #2: crashed: BUG: soft lockup in sendfile64 run #3: crashed: BUG: soft lockup in corrupted run #4: crashed: BUG: soft lockup in corrupted run #5: crashed: BUG: soft lockup in corrupted run #6: crashed: BUG: soft lockup in ext4_file_write_iter run #7: crashed: BUG: soft lockup in ext4_file_write_iter run #8: crashed: BUG: soft lockup in sendfile64 run #9: crashed: BUG: soft lockup in corrupted run #10: crashed: BUG: soft lockup in sendfile64 run #11: crashed: BUG: soft lockup in corrupted run #12: crashed: BUG: soft lockup in corrupted run #13: crashed: BUG: soft lockup in corrupted run #14: crashed: BUG: soft lockup in corrupted run #15: crashed: BUG: soft lockup in corrupted run #16: crashed: BUG: soft lockup in sendfile64 run #17: crashed: BUG: soft lockup in corrupted run #18: crashed: BUG: soft lockup in corrupted run #19: crashed: BUG: soft lockup in corrupted testing current HEAD dffb5c6ff09c51ed585e3e7665143df103867fc8 testing commit dffb5c6ff09c51ed585e3e7665143df103867fc8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 024b52d557b1bd54121eff5f6005bc3b29ae3a4567daef71de6d2cb85f555c41 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m4.228524492s (build: 14m44.342312825s, test: 6m36.247753736s) the crash still happens on HEAD commit msg: Linux 4.14.280 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1