bisecting fixing commit since fb893de323e2d39f7a1f6df425703a2edbdf56ea
building syzkaller on bc15f7dbbc1c6e2042a7115b3fdacc0ada8c35e7
testing commit fb893de323e2d39f7a1f6df425703a2edbdf56ea with gcc (GCC) 8.4.1 20210217
kernel signature: 2bee816e6fc05d6cb4590f5e8ed0dd0b4185585a4fe74e4e09c5420383f2eaf0
run #0: crashed: BUG: soft lockup in do_idle
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: soft lockup in do_idle
run #3: crashed: BUG: workqueue lockup
run #4: crashed: BUG: workqueue lockup
run #5: crashed: BUG: soft lockup in security_file_ioctl
run #6: crashed: BUG: workqueue lockup
run #7: crashed: BUG: soft lockup in rtnl_newlink
run #8: crashed: BUG: workqueue lockup
run #9: crashed: BUG: soft lockup in do_idle
run #10: crashed: BUG: soft lockup in do_idle
run #11: crashed: BUG: soft lockup in watchdog_timer_fn
run #12: crashed: BUG: soft lockup in do_idle
run #13: crashed: BUG: soft lockup in queue_delayed_work_on
run #14: crashed: BUG: soft lockup in do_idle
run #15: crashed: INFO: rcu detected stall in newlstat
run #16: crashed: BUG: soft lockup in rtnl_newlink
run #17: crashed: INFO: rcu detected stall in do_idle
run #18: crashed: BUG: workqueue lockup
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: soft lockup in do_idle
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: BUG: workqueue lockup
run #5: crashed: BUG: soft lockup in do_wp_page
run #6: crashed: INFO: rcu detected stall in do_idle
run #7: crashed: INFO: rcu detected stall in do_idle
run #8: crashed: no output from test machine
run #9: crashed: no output from test machine
revisions tested: 2, total time: 29m31.075924923s (build: 12m26.637874643s, test: 16m0.999453104s)
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