[Bug 11751] New: chrt Segmentation fault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11751

            Bug ID: 11751
           Summary: chrt Segmentation fault
           Product: Busybox
           Version: 1.29.x
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: yangtze31 at gmail.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

chrt woks with Buildroot 2018.02.x, now Segmentation fault with Buildroot
2019.02.1

I don't know how to debug.

pid 198 is one of the four threads of mpd.
chrt works with others pids, but with this one:
# chrt -p 198
Segmentation fault

# gdb --args chrt -p 198
GNU gdb (GDB) 8.1.1
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-buildroot-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from chrt...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/chrt -p 198

Program received signal SIGSEGV, Segmentation fault.
0x0000ffffb24f6510 in strlen () from /lib64/libc.so.6
(gdb) bt
#0  0x0000ffffb24f6510 in strlen () from /lib64/libc.so.6
#1  0x0000ffffb24c3e80 in vfprintf () from /lib64/libc.so.6
#2  0x0000ffffb24c99fc in printf () from /lib64/libc.so.6
#3  0x000000000042fd94 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

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