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Date:   Mon, 16 Jan 2023 12:46:05 +0900
From:   Sergey Senozhatsky <senozhatsky@chromium.org>
To:     "Huang, Ying" <ying.huang@intel.com>
Cc:     Sergey Senozhatsky <senozhatsky@chromium.org>,
        Matthew Wilcox <willy@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Minchan Kim <minchan@kernel.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Subject: Re: [PATCHv2 0/4] zsmalloc: make zspage chain size configurable
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References: <20230109033838.2779902-1-senozhatsky@chromium.org>
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 <87y1q3qneo.fsf@yhuang6-desk2.ccr.corp.intel.com>
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Hi,

On (23/01/16 09:27), Huang, Ying wrote:
> >> [   59.546261] Call Trace:
> >> [   59.546833]  <TASK>
> >> [   59.547371]  ? lock_is_held_type+0xd9/0x130
> >> [   59.548331]  migrate_pages_batch+0x650/0xdc0
> >> [   59.549326]  ? move_freelist_tail+0xc0/0xc0
> >> [   59.550281]  ? isolate_freepages+0x290/0x290
> >> [   59.551289]  ? folio_flags.constprop.0+0x50/0x50
> >> [   59.552348]  migrate_pages+0x3fa/0x4d0
> >> [   59.553224]  ? isolate_freepages+0x290/0x290
> >> [   59.554214]  ? move_freelist_tail+0xc0/0xc0
> >> [   59.555173]  compact_zone+0x51b/0x6a0
> >> [   59.556031]  proactive_compact_node+0x8e/0xe0
> >> [   59.557033]  kcompactd+0x1c3/0x350
> >> [   59.557842]  ? swake_up_all+0xe0/0xe0
> >> [   59.558699]  ? kcompactd_do_work+0x260/0x260
> >> [   59.559703]  kthread+0xec/0x110
> >> [   59.560450]  ? kthread_complete_and_exit+0x20/0x20
> >> [   59.561582]  ret_from_fork+0x1f/0x30
> >> [   59.562427]  </TASK>
> >> [   59.562966] Modules linked in: deflate zlib_deflate zstd zstd_compress zram
> >> [   59.564591] ---[ end trace 0000000000000000 ]---
> >> [   59.565661] RIP: 0010:move_to_new_folio+0x362/0x3b0
> 
> Thanks for reporting.  We have just fixed a ZRAM related bug in
> migrate_pages() batching series with the help of Mike.

Oh, great. Yeah, I narroved it down to that series as well.

> https://lore.kernel.org/linux-mm/Y8DizzvFXBSEPzI4@monkey/

That fixes it!