bisecting fixing commit since 0f091e43310f5c292b7094f9f115e651358e8053
building syzkaller on d5a3ae1f760e7cb2cd5a721d9645ae22eae114fe
testing commit 0f091e43310f5c292b7094f9f115e651358e8053 with gcc (GCC) 8.1.0
kernel signature: c40d39f1c244ee778309db1c39752189af69d45d028ffdbf17c4492ec46f1635
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: workqueue lockup
run #3: crashed: BUG: workqueue lockup
run #4: crashed: BUG: workqueue lockup
run #5: crashed: INFO: rcu detected stall in do_idle
run #6: crashed: INFO: rcu detected stall in do_idle
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
testing current HEAD af3f4a85d90218bb59315d591bd2bffa5e646466
testing commit af3f4a85d90218bb59315d591bd2bffa5e646466 with gcc (GCC) 8.1.0
kernel signature: 2b3d7fc5b3a0b7f160e6778ed256f318623cb950356d4d1c189c7dc32d5ed3da
run #0: crashed: BUG: workqueue lockup
run #1: crashed: BUG: workqueue lockup
run #2: crashed: BUG: workqueue lockup
run #3: crashed: INFO: rcu detected stall in do_idle
run #4: crashed: BUG: workqueue lockup
run #5: crashed: BUG: workqueue lockup
run #6: crashed: INFO: rcu detected stall in do_idle
run #7: crashed: BUG: workqueue lockup
run #8: crashed: INFO: rcu detected stall in do_idle
run #9: crashed: BUG: workqueue lockup
revisions tested: 2, total time: 25m19.256711563s (build: 9m45.032606624s, test: 15m2.48132932s)
the crash still happens on HEAD
commit msg: Merge branch 'mlxsw-Misc-updates' Ido Schimmel says:
crash: BUG: workqueue lockup
BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 41s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256 refcnt=14
    pending: kfree_rcu_monitor, nsim_dev_trap_report_work, nsim_dev_trap_report_work, nsim_dev_trap_report_work, nsim_dev_trap_report_work, nsim_dev_trap_report_work, psi_avgs_work, ovs_dp_masks_rebalance, ovs_dp_masks_rebalance, ovs_dp_masks_rebalance, ovs_dp_masks_rebalance, vmstat_shepherd, cache_reap
workqueue events_long: flags=0x0
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=6/256 refcnt=7
    pending: defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler
workqueue events_power_efficient: flags=0x80
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256 refcnt=6
    pending: gc_worker, wg_ratelimiter_gc_entries, neigh_periodic_work, neigh_periodic_work, do_cache_clean