bisecting fixing commit since b850307b279cbd12ab8c654d1a3dfe55319cc475
building syzkaller on 22f8756722ad4bbf532a6861776b24cbb513755e
testing commit b850307b279cbd12ab8c654d1a3dfe55319cc475 with gcc (GCC) 8.1.0
kernel signature: 2566483a7f76d23ab9ccfc5682926833603d33a8ba47e8d53a832460774be0ee
run #0: crashed: INFO: task hung in synchronize_rcu
run #1: crashed: INFO: task hung in synchronize_rcu
run #2: crashed: INFO: task hung in synchronize_rcu
run #3: crashed: no output from test machine
run #4: crashed: no output from test machine
run #5: crashed: INFO: task hung in synchronize_rcu
run #6: crashed: no output from test machine
run #7: crashed: INFO: task hung in synchronize_rcu
run #8: OK
run #9: OK
testing current HEAD 7f2c5eb458b8855655a19c44cd0043f7f83c595f
testing commit 7f2c5eb458b8855655a19c44cd0043f7f83c595f with gcc (GCC) 8.1.0
kernel signature: 075ac9512d8a05bd993590d1162b17ef1c3785339d0c06c7e9ea089b3286824e
run #0: crashed: INFO: task hung in synchronize_rcu
run #1: crashed: no output from test machine
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 38m13.870299371s (build: 18m0.148242643s, test: 19m4.015878414s)
the crash still happens on HEAD
commit msg: Linux 4.14.191
crash: no output from test machine