bisecting fixing commit since f4cc0ed9b2c72687303b035379c5824a02224354
building syzkaller on 7509bf360eba1461ac6059e4cacfbc29c9d2d4c7
testing commit f4cc0ed9b2c72687303b035379c5824a02224354 with gcc (GCC) 8.4.1 20210217
kernel signature: 3040e7e96f047622a431a23a4e089a7b87546860b045c524a54361628be55315
run #0: crashed: BUG: soft lockup in rw_verify_area
run #1: crashed: BUG: soft lockup in corrupted
run #2: crashed: BUG: soft lockup in sendfile64
run #3: crashed: BUG: soft lockup in corrupted
run #4: crashed: BUG: soft lockup in ext4_file_write_iter
run #5: crashed: BUG: soft lockup in corrupted
run #6: crashed: BUG: soft lockup in corrupted
run #7: crashed: BUG: soft lockup in corrupted
run #8: crashed: BUG: soft lockup in corrupted
run #9: crashed: BUG: soft lockup in do_iter_readv_writev
run #10: crashed: BUG: soft lockup in corrupted
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 corrupted
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 corrupted
run #19: crashed: BUG: soft lockup in sendfile64
testing current HEAD 96afcb20f36f07683aaa342e592ea8ec76fd1fa6
testing commit 96afcb20f36f07683aaa342e592ea8ec76fd1fa6 with gcc (GCC) 8.4.1 20210217
kernel signature: 2dd0793076dea4bc15818e212bf479b9ebd082236118dca0fe9f9732c2495a6d
all runs: crashed: unregister_netdevice: waiting for DEV to become free
revisions tested: 2, total time: 28m24.486063181s (build: 20m51.156377373s, test: 6m59.710430927s)
the crash still happens on HEAD
commit msg: Linux 4.14.233
crash: unregister_netdevice: waiting for DEV to become free
unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1