On Thu, Oct 14, 2021 at 04:24:33PM +0800, Zqiang wrote: > <IRQ> > __init_work+0x2d/0x50 > synchronize_rcu_expedited+0x3af/0x650 > bdi_remove_from_list [inline] > bdi_unregister+0x17f/0x5c0 > release_bdi+0xa1/0xc0 > kref_put [inline] > bdi_put+0x72/0xa0 > bdev_free_inode+0x11e/0x220 > i_callback+0x3f/0x70 > rcu_do_batch [inline] > rcu_core+0x76d/0x16c0 > __do_softirq+0x1d7/0x93b > invoke_softirq [inline] > __irq_exit_rcu [inline] > irq_exit_rcu+0xf2/0x130 > sysvec_apic_timer_interrupt+0x93/0xc0 > > The bdi_remove_from_list() is called in RCU softirq, however the > synchronize_rcu_expedited() will produce sleep action, use kfree_rcu() > instead of it. What workload is this running? If we hit the RCU unregister path from inode freeing we have a lifetime problem somewhere that we need to fix first.
