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 corrupted
run #3: crashed: BUG: soft lockup in sendfile64
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 ext4_file_write_iter
run #9: crashed: BUG: soft lockup in sendfile64
run #10: crashed: BUG: soft lockup in ext4_file_write_iter
run #11: crashed: BUG: soft lockup in sendfile64
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 corrupted
run #16: crashed: BUG: soft lockup in corrupted
run #17: crashed: BUG: soft lockup in corrupted
run #18: crashed: BUG: soft lockup in sendfile64
run #19: crashed: BUG: soft lockup in ext4_file_write_iter
testing current HEAD 2760370b164918bd9311e6bf445cf4c118d3463c
testing commit 2760370b164918bd9311e6bf445cf4c118d3463c
compiler: gcc version 8.4.1 20210217 (GCC)
kernel signature: c2f0afe3777fce2b5ea355a0dd721ad99abe68bd975c0987cd4d46e231f8093d
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 26m30.287943336s (build: 19m15.861732372s, test: 6m50.093709518s)
the crash still happens on HEAD
commit msg: Linux 4.14.252
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1