[LTP] LTP: '/proc/self/io' for reading at readahead02.c:113: ENOENT No such file or directory

[Jan Stancek]

----- Original Message -----
> 
> 
> ----- Original Message -----
> > readahead02 used to pass on arm32 on LTP-20180926 release. Now using
> > the latest LTP master it is getting FAILED.
> > 
> > tst_device.c:230: INFO: Using test device LTP_DEV='/dev/loop0'
> > tst_mkfs.c:90: INFO: Formatting /dev/loop0 with ext2 opts='' extra opts=''
> > mke2fs 1.43.5 (04-Aug-2017)
> > [  603.092608] EXT4-fs (loop0): mounting ext2 file system using the
> > ext4 subsystem
> > [  603.107967] EXT4-fs (loop0): mounted filesystem without journal. Opts:
> > (null)
> > tst_test.c:1085: INFO: Timeout per run is 0h 15m 00s
> > readahead02.c:359: INFO: overlayfs is not configured in this kernel.
> > readahead02.c:244: INFO: Test #0: readahead on file
> > readahead02.c:134: INFO: creating test file of size: 67108864
> > safe_file_ops.c:202: BROK: Failed to open FILE '/proc/self/io' for
> > reading at readahead02.c:113: ENOENT
> 
> We switched from /proc/$pid to /proc/self in December:
>   commit 75506e4f1b52ea6bb63a52afb34035d9dde55d14
>   Date:   Tue Dec 4 14:54:19 2018 +0100
>     syscalls/readahead02: Simplify reading proc files
>    
>     Use SAFE_FILE_LINES_SCANF() for parsing multiline /proc/ files
>      Use /proc/self/io instead of /proc/$pid/io.
> 
> @Naresh, what is the kernel version you see this fail with?

I see Rafael found possible explanation. get_bytes_read() wouldn't
loudly fail before commit above. Now it's using SAFE_ func, that
triggers TBROK if file doesn't exist.

> 
> > 
> > Best regards
> > Naresh Kamboju
> > 
> > --
> > Mailing list info: https://lists.linux.it/listinfo/ltp
> > 
> 
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