bisecting fixing commit since 675cc038067f0e530471c56a7442935f84669d95
building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3
testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.4.1 20210217
kernel signature: de0459441487c5202d94405963e48605d8ad9c4cba4b45229de73dc69b14a94d
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: INFO: task hung in grab_super
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 3c8c23092588a23bf1856a64f58c37f477a413be
testing commit 3c8c23092588a23bf1856a64f58c37f477a413be with gcc (GCC) 8.4.1 20210217
kernel signature: 95edf1156761fd855ca4b5922f27694358f069d822cd86ce26cc2d87be3d6464
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: no output from test machine
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
revisions tested: 2, total time: 34m11.849919361s (build: 17m3.633280266s, test: 16m24.31357565s)
the crash still happens on HEAD
commit msg: Linux 4.19.190
crash: no output from test machine