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: soft lockup in smp_call_function
run #2: crashed: BUG: soft lockup in tc_modify_qdisc
run #3: crashed: BUG: soft lockup in smp_call_function
run #4: crashed: BUG: soft lockup in smp_call_function
run #5: crashed: BUG: soft lockup in smp_call_function
run #6: crashed: BUG: soft lockup in smp_call_function
run #7: crashed: BUG: workqueue lockup
run #8: crashed: BUG: soft lockup in smp_call_function
run #9: crashed: INFO: rcu detected stall in tc_modify_qdisc
run #10: crashed: no output from test machine
run #11: crashed: no output from test machine
run #12: crashed: no output from test machine
run #13: crashed: no output from test machine
run #14: crashed: no output from test machine
run #15: crashed: no output from test machine
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 1678e493d530e7977cce34e59a86bb86f3c5631e
testing commit 1678e493d530e7977cce34e59a86bb86f3c5631e with gcc (GCC) 10.2.1 20210217
kernel signature: 7c1825a04ae1b3784848cef247c5d55af45d785a4bc5b81b7ad620b32a1e56cd
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 smp_call_function
run #4: crashed: BUG: soft lockup in smp_call_function
run #5: crashed: BUG: workqueue lockup
run #6: crashed: BUG: soft lockup in tc_modify_qdisc
run #7: crashed: INFO: rcu detected stall in do_idle
run #8: crashed: INFO: rcu detected stall in do_idle
run #9: crashed: no output from test machine
revisions tested: 2, total time: 28m23.621717932s (build: 11m41.382989075s, test: 16m3.258730532s)
the crash still happens on HEAD
commit msg: Merge tag 'lto-v5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
crash: no output from test machine