masayuki2009 commented on pull request #4118: URL: https://github.com/apache/incubator-nuttx/pull/4118#issuecomment-880242090
```
Breakpoint 1, getumask () at misc/lib_umask.c:66
66 info = task_get_info();
(gdb) where
#0 getumask () at misc/lib_umask.c:66
#1 0x20406534 in file_vopen (filep=filep@entry=0x80000ff0,
path=path@entry=0x2040d55c "/dev/console", oflags=oflags@entry=3, ap=<optimized
out>, ap@entry\
=0x80001038) at vfs/fs_open.c:74
#2 0x204065fc in nx_vopen (path=path@entry=0x2040d55c "/dev/console",
oflags=oflags@entry=3, ap=ap@entry=0x80001038) at vfs/fs_open.c:202
#3 0x2040663e in nx_open (path=path@entry=0x2040d55c "/dev/console",
oflags=oflags@entry=3) at vfs/fs_open.c:303
#4 0x2040126c in group_setupidlefiles (tcb=tcb@entry=0x80000690
<g_idletcb>) at group/group_setupidlefiles.c:78
#5 0x20400ab4 in nx_start () at init/nx_start.c:739
#6 0x20400188 in __fe310_start () at chip/fe310_start.c:119
#7 0x20400026 in __start () at chip/fe310_head.S:62
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) n
67 return info->ta_umask;
(gdb) p info
$1 = (struct task_info_s *) 0x0
(gdb)
```
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