bisecting fixing commit since 675cc038067f0e530471c56a7442935f84669d95
building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3
testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.4.1 20210217
kernel signature: e0d3cdb839c43747236dbd3c60ae8d014ad6d834d822e4b22c1bef4fad12ebab
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 255b58a2b3af0baa0ee11507390349217b8b73b0
testing commit 255b58a2b3af0baa0ee11507390349217b8b73b0 with gcc (GCC) 8.4.1 20210217
kernel signature: 728de35bbe5dab681b6b7645eef24de3def34e8051c377be5efc69101909c0c5
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: 32m8.870335271s (build: 14m51.746730079s, test: 16m20.544810328s)
the crash still happens on HEAD
commit msg: Linux 4.19.176
crash: no output from test machine