bisecting fixing commit since 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf
building syzkaller on 510951950dc0ee69cfdaf746061d3dbe31b49fd8
testing commit 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf with gcc (GCC) 8.4.1 20210217
kernel signature: 1a1d2595ef8b42cb606e33e16b65cfdcc5769cddd33209112c5bdb2507607901
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: workqueue lockup
run #3: crashed: BUG: soft lockup in tc_modify_qdisc
run #4: crashed: BUG: workqueue lockup
run #5: crashed: BUG: soft lockup in smp_call_function
run #6: crashed: BUG: soft lockup in smp_call_function
run #7: crashed: BUG: soft lockup in smp_call_function
run #8: crashed: BUG: soft lockup in smp_call_function
run #9: crashed: BUG: soft lockup in smp_call_function
run #10: crashed: BUG: soft lockup in smp_call_function
run #11: crashed: BUG: workqueue lockup
run #12: crashed: BUG: workqueue lockup
run #13: crashed: BUG: soft lockup in smp_call_function
run #14: crashed: BUG: soft lockup in smp_call_function
run #15: crashed: INFO: rcu detected stall in tc_modify_qdisc
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 fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
testing commit fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8 with gcc (GCC) 10.2.1 20210217
kernel signature: fdce1ebc6a06e168573b64032272962a49a5a9f92f72a2c80d874082827e9020
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: soft lockup in smp_call_function
run #2: crashed: BUG: workqueue lockup
run #3: crashed: BUG: workqueue lockup
run #4: crashed: INFO: rcu detected stall in do_idle
run #5: crashed: INFO: rcu detected stall in do_idle
run #6: crashed: no output from test machine
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: 29m35.100313656s (build: 12m58.181496718s, test: 15m58.742772421s)
the crash still happens on HEAD
commit msg: Linux 5.12-rc1
crash: no output from test machine