Re: [PATCH v2] erofs: fix unexpected EIO under memory pressure

On 2025/12/19 20:40, Junbeom Yeom wrote:

erofs readahead could fail with ENOMEM under the memory pressure because it tries to alloc_page with GFP_NOWAIT | GFP_NORETRY, while GFP_KERNEL for a regular read. And if readahead fails (with non-uptodate folios), the original request will then fall back to synchronous read, and `.read_folio()` should return appropriate errnos.

However, in scenarios where readahead and read operations compete, read operation could return an unintended EIO because of an incorrect error propagation.

To resolve this, this patch modifies the behavior so that, when the PCL is for read(which means pcl.besteffort is true), it attempts actual decompression instead of propagating the privios error except initial EIO.

• Page size: 4K
• The original size of FileA: 16K
• Compress-ratio per PCL: 50% (Uncompressed 8K -> Compressed 4K)

[page0, page1] [page2, page3] [PCL0]---------[PCL1]

• functions declaration: . pread(fd, buf, count, offset) . readahead(fd, offset, count)

• Thread A tries to read the last 4K

• Thread B tries to do readahead 8K from 4K

• RA, besteffort == false

• R, besteffort == true

     <process A>                   <process B>
  
  

pread(FileA, buf, 4K, 12K) do readahead(page3) // failed with ENOMEM wait_lock(page3) if (!uptodate(page3)) goto do_read readahead(FileA, 4K, 8K) // Here create PCL-chain like below: // [null, page1] [page2, null] // [PCL0:RA]-----[PCL1:RA] ... do read(page3) // found [PCL1:RA] and add page3 into it, // and then, change PCL1 from RA to R ... // Now, PCL-chain is as below: // [null, page1] [page2, page3] // [PCL0:RA]-----[PCL1:R]

                              // try to decompress PCL-chain...
                              z_erofs_decompress_queue
                                err = 0;

                                // failed with ENOMEM, so page 1
                                // only for RA will not be uptodated.
                                // it's okay.
                                err = decompress([PCL0:RA], err)

                                // However, ENOMEM propagated to next
                                // PCL, even though PCL is not only
                                // for RA but also for R. As a result,
                                // it just failed with ENOMEM without
                                // trying any decompression, so page2
                                // and page3 will not be uptodated.
             ** BUG HERE ** --> err = decompress([PCL1:R], err)

                                return err as ENOMEM

... wait_lock(page3) if (!uptodate(page3)) return EIO <-- Return an unexpected EIO! ...

Fixes: 2349d2fa02db ("erofs: sunset unneeded NOFAILs") Cc: stable@vger.kernel.org Reviewed-by: Jaewook Kim jw5454.kim@samsung.com Reviewed-by: Sungjong Seo sj1557.seo@samsung.com Signed-off-by: Junbeom Yeom junbeom.yeom@samsung.com

Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com

Thanks, Gao Xiang