[f2fs-dev] [Bug 220321] F2FS: workqueue: WQ_MEM_RECLAIM writeback:wb_workfn is flushing !WQ_MEM_RECLAIM events_unbound:quota_release_workfn

[bugzilla-daemon--- via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

https://bugzilla.kernel.org/show_bug.cgi?id=220321

--- Comment #3 from SEO HOYOUNG (hy50.seo@samsung.com) ---
Our development system occurred this problem again.
It seems that write data to f2fs using write back option.

The wb_wrokfn function use writeback workqueue.
And the writeback workqueue created using WQ_MEM_RECLAIM option.

 static int __init default_bdi_init(void)
 {
         bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_UNBOUND |
                                  WQ_SYSFS, 0);
         if (!bdi_wq)
                 return -ENOMEM;
         return 0;
 }

So it occurred kernel panic when insert quota_release_work to system_unbound_wq
during wb_workfn working.
But it seems that could not add WQ_MEM_RECLAIM to system_unbound_wq.
Therefore, it would be better to remove the WQ_MEM_RECLAIM flag from the bdi_wq
workcue.
Is it possible?

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