bisecting fixing commit since f4cc0ed9b2c72687303b035379c5824a02224354 building syzkaller on 7509bf360eba1461ac6059e4cacfbc29c9d2d4c7 testing commit f4cc0ed9b2c72687303b035379c5824a02224354 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 3040e7e96f047622a431a23a4e089a7b87546860b045c524a54361628be55315 run #0: crashed: BUG: soft lockup in corrupted run #1: crashed: BUG: soft lockup in sendfile64 run #2: crashed: BUG: soft lockup in corrupted run #3: crashed: BUG: soft lockup in ext4_file_write_iter run #4: crashed: BUG: soft lockup in corrupted run #5: crashed: BUG: soft lockup in corrupted run #6: crashed: BUG: soft lockup in sendfile64 run #7: crashed: BUG: soft lockup in corrupted 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 sendfile64 run #13: crashed: BUG: soft lockup in corrupted run #14: crashed: BUG: soft lockup in sendfile64 run #15: crashed: BUG: soft lockup in sendfile64 run #16: crashed: BUG: soft lockup in corrupted run #17: crashed: BUG: soft lockup in ext4_file_write_iter run #18: crashed: BUG: soft lockup in corrupted run #19: crashed: BUG: soft lockup in ext4_file_write_iter testing current HEAD 964f3712e6a7447d9d3203f2be3f6c50e78ea179 testing commit 964f3712e6a7447d9d3203f2be3f6c50e78ea179 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 4a0ea0bafbe10f79e70d02eda3b271a03eee2d3c412e32100c8e38768d5c0995 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 26m36.739983457s (build: 19m25.868076519s, test: 6m46.655622435s) the crash still happens on HEAD commit msg: Linux 4.14.240 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1