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

[Jan Stancek <jstancek@redhat.com>]

----- 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?

> 
> Best regards
> Naresh Kamboju
> 
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