bisecting fixing commit since 4b6c093e21d36bede0fd88fd0aeb3b03647260e4
building syzkaller on 424dd8e7b52828cad44ce653a5d4ac30670f5e2c
testing commit 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 with gcc (GCC) 8.4.1 20210217
kernel signature: 8c9d1a13622c1d77dd8186e3c6f86a6adb657c867589e56f1aae1c651e3d66ff
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 tc_modify_qdisc
run #5: crashed: INFO: rcu detected stall in tc_modify_qdisc
run #6: crashed: INFO: rcu detected stall in tc_modify_qdisc
run #7: crashed: INFO: rcu detected stall in tc_modify_qdisc
run #8: crashed: INFO: rcu detected stall in tc_modify_qdisc
run #9: crashed: no output from test machine
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: INFO: rcu detected stall in rht_deferred_worker
run #18: crashed: no output from test machine
run #19: crashed: no output from test machine
testing current HEAD 17ae69aba89dbfa2139b7f8024b757ab3cc42f59
testing commit 17ae69aba89dbfa2139b7f8024b757ab3cc42f59 with gcc (GCC) 10.2.1 20210217
kernel signature: ef857d65c4d84760bee16e5b4398c2802ea9c6bb50252ebab9622f30683727d7
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: soft lockup in smp_call_function
run #3: crashed: BUG: soft lockup in smp_call_function
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: 29m41.330147544s (build: 12m32.707057654s, test: 16m10.474247558s)
the crash still happens on HEAD
commit msg: Merge tag 'landlock_v34' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
crash: no output from test machine