bisecting fixing commit since 675cc038067f0e530471c56a7442935f84669d95
building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3
testing commit 675cc038067f0e530471c56a7442935f84669d95 with gcc (GCC) 8.4.1 20210217
kernel signature: d263ae73146ba2bd23c38fe3f102c70c4ed8feb2d63a49b027dc954e4ea606bf
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: INFO: task hung in grab_super
run #17: crashed: INFO: task hung in grab_super
run #18: crashed: no output from test machine
run #19: crashed: no output from test machine
testing current HEAD 78fec1611cbf7b0bdaddfdbf174a3a2463663bff
testing commit 78fec1611cbf7b0bdaddfdbf174a3a2463663bff with gcc (GCC) 8.4.1 20210217
kernel signature: 07f4999d38c4feeb25d4d2d85721e60db3392e3247fb69143be10738213995dc
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: no output from test machine
run #9: crashed: no output from test machine
revisions tested: 2, total time: 32m42.33011554s (build: 15m36.711171708s, test: 16m41.814448488s)
the crash still happens on HEAD
commit msg: Linux 4.19.183
crash: no output from test machine