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 smp_call_function
run #1: crashed: BUG: soft lockup in do_idle
run #2: crashed: BUG: soft lockup in process_one_work
run #3: crashed: BUG: workqueue lockup
run #4: crashed: BUG: soft lockup in rtnl_newlink
run #5: crashed: BUG: workqueue lockup
run #6: crashed: BUG: soft lockup in do_idle
run #7: crashed: BUG: soft lockup in do_idle
run #8: crashed: BUG: soft lockup in sys_exit_group
run #9: crashed: BUG: soft lockup in linkwatch_event
run #10: crashed: BUG: soft lockup in rtnl_newlink
run #11: crashed: BUG: soft lockup in rtnl_newlink
run #12: crashed: BUG: soft lockup in do_idle
run #13: crashed: BUG: soft lockup in rtnl_newlink
run #14: crashed: BUG: soft lockup in corrupted
run #15: crashed: INFO: rcu detected stall in addrconf_dad_work
run #16: crashed: INFO: rcu detected stall in addrconf_dad_work
run #17: crashed: INFO: rcu detected stall in do_idle
run #18: crashed: BUG: soft lockup in addrconf_dad_work
run #19: crashed: INFO: rcu detected stall in try_check_zero
testing current HEAD 3dbdb38e286903ec220aaf1fb29a8d94297da246
testing commit 3dbdb38e286903ec220aaf1fb29a8d94297da246 with gcc (GCC) 10.2.1 20210217
kernel signature: f1419f6cb659561a40f2d6422ada47caea7cb58bab0c0379d95eb2d916999df2
run #0: crashed: BUG: soft lockup in do_idle
run #1: crashed: BUG: workqueue lockup
run #2: crashed: INFO: rcu detected stall in sys_open
run #3: crashed: INFO: rcu detected stall in sys_exit_group
run #4: crashed: INFO: rcu detected stall in sched_show_task
run #5: crashed: INFO: rcu detected stall in sched_show_task
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: 27m4.484687497s (build: 12m14.479118273s, test: 14m0.962103438s)
the crash still happens on HEAD
commit msg: Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
crash: no output from test machine