External storage (SMB): upstream prematurely closed FastCGI request while reading upstream

[RoL0NL]

Describe the bug
After opening a file from an external storage location (all SMB in my case), the file fails to load in the webapplication (e.g. pdf: An error occurred while loading the PDF. ) , in the Android client (Failed to download) or in Collabora ( loadComponentFromURL returned an empty reference). The fpm container log states "upstream prematurely closed FastCGI request while reading upstream"

To Reproduce
Steps to reproduce the behavior:

1. Open a file from external SMB storage
2. See error

Expected behavior
Open/download file

Client details:

• Windows 10 20H2 (19042.906)
• Firefox 87.0

Server details

Operating system:
Debian GNU/Linux 10 (buster)/Linux 4.19.0-14-amd64 x86_64/Docker version 20.10.5, build 55c4c88

Web server:
nginx:1.19.7-alpine docker image

Database:
PostgreSQL 13.2 on x86_64-pc-linux-musl, compiled by gcc (Alpine 10.2.1_pre1) 10.2.1 20201203, 64-bit
postgres:13.2-alpine docker image

PHP version:
7.4.16

Nextcloud version:
21.0.1
nextcloud:21.0.1-fpm docker image

Version of the richdocuments app
4.0.4

Version of Collabora Online
6.4.7.5
collabora/code:6.4.7.5 docker image

Logs

[PHP] Error: Error: fread(): Icewind\SMB\Native\NativeReadStream::stream_read - read 5409 bytes more data than requested (13601 read, 8192 max) - excess data will be lost at /var/www/html/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php#55 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError(2, "fread(): Icewin ... t", "/var/www/html/a ... p", 55, {count: 8192})
 1. /var/www/html/apps/files_external/3rdparty/icewind/streams/src/Wrapper.php line 55
    fread(null, 8192)
 2. /var/www/html/apps/files_external/3rdparty/icewind/streams/src/CallbackWrapper.php line 96
    Icewind\Streams\Wrapper->stream_read(8192)
 3. <<closure>>
    Icewind\Streams\CallbackWrapper->stream_read(8192)
 4. /var/www/html/3rdparty/sabre/http/lib/Sapi.php line 112
    stream_copy_to_stream(null, null, 4194304)
 5. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 490
    Sabre\HTTP\Sapi::sendResponse(Sabre\HTTP\Response {})
 6. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 253
    Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
 7. /var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php line 321
    Sabre\DAV\Server->start()
 8. /var/www/html/apps/dav/lib/Server.php line 332
    Sabre\DAV\Server->exec()
 9. /var/www/html/apps/dav/appinfo/v2/remote.php line 35
    OCA\DAV\Server->exec()
10. /var/www/html/remote.php line 167
    require_once("/var/www/html/a ... p")

GET /remote.php/dav/files/path/file.pdf
from x.x.x.x by xxx at 2021-05-10T08:04:56+00:00

[RoL0NL]

Ah, also have to look for closed issues.. duplicate of #26457