bisecting fixing commit since 675cc038067f0e530471c56a7442935f84669d95
building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3
testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.4.1 20210217
kernel signature: 1b9c4b9748057be3f95d2ed4a4aab1bd3f7a0d5223f3d6f4c9cd0b8661a5fff1
run #0: crashed: INFO: task hung in grab_super
run #1: crashed: INFO: task hung in grab_super
run #2: crashed: INFO: task hung in grab_super
run #3: crashed: INFO: task hung in grab_super
run #4: crashed: INFO: task hung in grab_super
run #5: crashed: INFO: task hung in grab_super
run #6: crashed: INFO: task hung in grab_super
run #7: crashed: INFO: task hung in grab_super
run #8: crashed: INFO: task hung in grab_super
run #9: crashed: INFO: task hung in grab_super
run #10: crashed: INFO: task hung in grab_super
run #11: crashed: INFO: task hung in grab_super
run #12: crashed: INFO: task hung in grab_super
run #13: crashed: INFO: task hung in grab_super
run #14: crashed: INFO: task hung in grab_super
run #15: crashed: no output from test machine
run #16: crashed: no output from test machine
run #17: crashed: no output from test machine
run #18: crashed: no output from test machine
run #19: crashed: no output from test machine
testing current HEAD 1722257b8ececec9b3b83a8b14058f8209d78071
testing commit 1722257b8ececec9b3b83a8b14058f8209d78071 with gcc (GCC) 8.4.1 20210217
kernel signature: 9edf0f4269fe2de7c4cdc4c5c6e4d24e2b468dead03dd18401160f757a3854f0
run #0: crashed: INFO: task hung in grab_super
run #1: crashed: INFO: task hung in grab_super
run #2: crashed: INFO: task hung in grab_super
run #3: crashed: INFO: task hung in grab_super
run #4: crashed: INFO: task hung in grab_super
run #5: crashed: INFO: task hung in grab_super
run #6: crashed: INFO: task hung in grab_super
run #7: crashed: INFO: task hung in grab_super
run #8: crashed: INFO: task hung in grab_super
run #9: crashed: no output from test machine
revisions tested: 2, total time: 37m27.429279206s (build: 20m19.593841538s, test: 16m16.543602573s)
the crash still happens on HEAD
commit msg: Linux 4.19.193
crash: no output from test machine