Проблема с расположением пространства виртуальной памяти приложения Android ⇐ Android

[Anonymous]

У меня есть 64-разрядное приложение, работающее на Android 8.1 в контейнере Docker, информация о системе:

Код: Выделить всё

system: Linux 5.4.40-gd8a93235f #2 SMP PREEMPT Tue Sep 8 08:26:34 CST 2020 aarch64 GNU/Linux
cpu:  arm64

при запуске приложения структура пространства виртуальной памяти выглядит следующим образом:

Код: Выделить всё

12c00000-12dc0000 rw-p 00000000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
12dc0000-12f80000 ---p 001c0000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
12f80000-12fc0000 rw-p 00380000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
12fc0000-13100000 ---p 003c0000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
13100000-13140000 rw-p 00500000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
13140000-131c0000 ---p 00540000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space) (deleted)
131c0000-52c00000 rw-p 005c0000 00:01 1196722750                         /dev/ashmem/dalvik-main space (region space)  ( d e l e t e d ) < b r   / > 7 0 0 0 0 0 0 0 - 7 0 2 3 9 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t . a r t < b r   / > 7 0 2 3 9 0 0 0 - 7 0 2 f e 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 4                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o r e - l i b a r t . a r t < b r   / > 7 0 2 f e 0 0 0 - 7 0 3 4 8 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 5                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o n s c r y p t . a r t < b r   / > 7 0 3 4 8 0 0 0 - 7 0 3 7 4 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o k h t t p . a r t < b r   / > 7 0 3 7 4 0 0 0 - 7 0 3 a 5 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 7                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - b o u n c y c a s t l e . a r t < b r   / > 7 0 3 a 5 0 0 0 - 7 0 3 b 5 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 8                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a p a c h e - x m l . a r t < b r   / > 7 0 3 b 5 0 0 0 - 7 0 3 b a 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 6 9                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - l e g a c y - t e s t . a r t < b r   / > 7 0 3 b a 0 0 0 - 7 0 3 e 5 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 7 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - e x t . a r t < b r   / > 7 0 3 e 5 0 0 0 - 7 0 9 d 9 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 7 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - f r a m e w o r k . a r t < b r   / > 7 0 9 d 9 0 0 0 - 7 0 a 1 b 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 7 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - t e l e p h o n y - c o m m o n . a r t < b r   / > 7 0 a 1 b 0 0 0 - 7 0 a 2 6 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 7 7                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - v o i p - c o m m o n . a r t < b r   / > 7 0 a 2 6 0 0 0 - 7 0 a 3 0 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 8 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - i m s - c o m m o n . a r t < b r   / > 7 0 a 3 0 0 0 0 - 7 0 a 5 6 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 8 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o r g . a p a c h e . h t t p . l e g a c y . b o o t . a r t < b r   / > 7 0 a 5 6 0 0 0 - 7 0 a 5 8 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 8 2                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a n d r o i d . h i d l . b a s e - V 1 . 0 - j a v a . a r t < b r   / > 7 0 a 5 8 0 0 0 - 7 0 a 5 b 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 8 : 0 7   4 9 2 0 7 9 8 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a n d r o i d . h i d l . m a n a g e r - V 1 . 0 - j a v a . a r t < b r   / > 7 0 a 5 b 0 0 0 - 7 0 c 3 5 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 8 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t . o a t < b r   / > 7 0 c 3 5 0 0 0 - 7 1 2 6 f 0 0 0   r - x p   0 0 1 d a 0 0 0   0 8 : 0 7   2 4 2 4 9 3 8 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t . o a t < b r   / > 7 1 2 6 f 0 0 0 - 7 1 2 7 1 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 2 7 1 0 0 0 - 7 1 2 7 2 0 0 0   r - - p   0 0 8 1 4 0 0 0   0 8 : 0 7   2 4 2 4 9 3 8 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t . o a t < b r   / > 7 1 2 7 2 0 0 0 - 7 1 2 7 3 0 0 0   r w - p   0 0 8 1 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 8 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t . o a t < b r   / > 7 1 2 7 3 0 0 0 - 7 1 3 4 8 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 9                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o r e - l i b a r t . o a t < b r   / > 7 1 3 4 8 0 0 0 - 7 1 5 c 5 0 0 0   r - x p   0 0 0 d 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 9                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o r e - l i b a r t . o a t < b r   / > 7 1 5 c 5 0 0 0 - 7 1 5 c 7 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 5 c 7 0 0 0 - 7 1 5 c 8 0 0 0   r - - p   0 0 3 5 2 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 9                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o r e - l i b a r t . o a t < b r   / > 7 1 5 c 8 0 0 0 - 7 1 5 c 9 0 0 0   r w - p   0 0 3 5 3 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 9                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o r e - l i b a r t . o a t < b r   / > 7 1 5 c 9 0 0 0 - 7 1 5 e 7 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o n s c r y p t . o a t < b r   / > 7 1 5 e 7 0 0 0 - 7 1 6 3 d 0 0 0   r - x p   0 0 0 1 e 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o n s c r y p t . o a t < b r   / > 7 1 6 3 d 0 0 0 - 7 1 6 3 e 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 6 3 e 0 0 0 - 7 1 6 3 f 0 0 0   r - - p   0 0 0 7 4 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o n s c r y p t . o a t < b r   / > 7 1 6 3 f 0 0 0 - 7 1 6 4 0 0 0 0   r w - p   0 0 0 7 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 6                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - c o n s c r y p t . o a t < b r   / > 7 1 6 4 0 0 0 0 - 7 1 6 6 6 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 4                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o k h t t p . o a t < b r   / > 7 1 6 6 6 0 0 0 - 7 1 6 d 5 0 0 0   r - x p   0 0 0 2 6 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 4                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o k h t t p . o a t < b r   / > 7 1 6 d 5 0 0 0 - 7 1 6 d 6 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 6 d 6 0 0 0 - 7 1 6 d 7 0 0 0   r - - p   0 0 0 9 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 4                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o k h t t p . o a t < b r   / > 7 1 6 d 7 0 0 0 - 7 1 6 d 8 0 0 0   r w - p   0 0 0 9 6 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 4                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - o k h t t p . o a t < b r   / > 7 1 6 d 8 0 0 0 - 7 1 6 f 5 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - b o u n c y c a s t l e . o a t < b r   / > 7 1 6 f 5 0 0 0 - 7 1 7 4 c 0 0 0   r - x p   0 0 0 1 d 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - b o u n c y c a s t l e . o a t < b r   / > 7 1 7 4 c 0 0 0 - 7 1 7 4 d 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 7 4 d 0 0 0 - 7 1 7 4 e 0 0 0   r - - p   0 0 0 7 4 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - b o u n c y c a s t l e . o a t < b r   / > 7 1 7 4 e 0 0 0 - 7 1 7 4 f 0 0 0   r w - p   0 0 0 7 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 3                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - b o u n c y c a s t l e . o a t < b r   / > 7 1 7 4 f 0 0 0 - 7 1 7 5 5 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a p a c h e - x m l . o a t < b r   / > 7 1 7 5 5 0 0 0 - 7 1 7 5 6 0 0 0   r - x p   0 0 0 0 6 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a p a c h e - x m l . o a t < b r   / > 7 1 7 5 6 0 0 0 - 7 1 7 5 7 0 0 0   r - - p   0 0 0 0 7 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a p a c h e - x m l . o a t < b r   / > 7 1 7 5 7 0 0 0 - 7 1 7 5 8 0 0 0   r w - p   0 0 0 0 8 0 0 0   0 8 : 0 7   2 4 2 4 9 3 5 0                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - a p a c h e - x m l . o a t < b r   / > 7 1 7 5 8 0 0 0 - 7 1 7 5 b 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - l e g a c y - t e s t . o a t < b r   / > 7 1 7 5 b 0 0 0 - 7 1 7 5 e 0 0 0   r - x p   0 0 0 0 3 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - l e g a c y - t e s t . o a t < b r   / > 7 1 7 5 e 0 0 0 - 7 1 7 5 f 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 7 5 f 0 0 0 - 7 1 7 6 0 0 0 0   r - - p   0 0 0 0 6 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - l e g a c y - t e s t . o a t < b r   / > 7 1 7 6 0 0 0 0 - 7 1 7 6 1 0 0 0   r w - p   0 0 0 0 7 0 0 0   0 8 : 0 7   2 4 2 4 9 3 7 1                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - l e g a c y - t e s t . o a t < b r   / > 7 1 7 6 1 0 0 0 - 7 1 7 7 4 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 2                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - e x t . o a t < b r   / > 7 1 7 7 4 0 0 0 - 7 1 7 a 2 0 0 0   r - x p   0 0 0 1 3 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 2                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - e x t . o a t < b r   / > 7 1 7 a 2 0 0 0 - 7 1 7 a 3 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 1 7 a 3 0 0 0 - 7 1 7 a 4 0 0 0   r - - p   0 0 0 4 1 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 2                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - e x t . o a t < b r   / > 7 1 7 a 4 0 0 0 - 7 1 7 a 5 0 0 0   r w - p   0 0 0 4 2 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 2                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - e x t . o a t < b r   / > 7 1 7 a 5 0 0 0 - 7 1 d b a 0 0 0   r - - p   0 0 0 0 0 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 5                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - f r a m e w o r k . o a t < b r   / > 7 1 d b a 0 0 0 - 7 2 f 3 f 0 0 0   r - x p   0 0 6 1 5 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 5                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - f r a m e w o r k . o a t < b r   / > 7 2 f 3 f 0 0 0 - 7 2 f 4 9 0 0 0   r w - p   0 0 0 0 0 0 0 0   0 0 : 0 0   0   < b r   / > 7 2 f 4 9 0 0 0 - 7 2 f 4 a 0 0 0   r - - p   0 1 7 9 a 0 0 0   0 8 : 0 7   2 4 2 4 9 3 6 5                                                       / s y s t e m / f r a m e w o r k / a r m 6 4 / b o o t - f r a m e w o r k . o a t < b r   / > 7 2 f 4 a 0 0 0 - 7 2 f 4 b 0 0 0   r w - p   0 1 7 9 b 0 0 0   0 8 : 0 7   2 4 2 4 9 365                           /system/framework/arm64/boot-framework.oat
72f4b000-73004000 r--p 00000000 08:07 24249380                           /system/framework/arm64/boot-telephony-common.oat
73004000-7322c000 r-xp 000b9000 08:07 24249380                           /system/framework/arm64/boot-telephony-common.oat
7322c000-7322f000 rw-p 00000000 00:00 0
7322f000-73230000 r--p 002e1000 08:07 24249380                           /system/framework/arm64/boot-telephony-common.oat
73230000-73231000 rw-p 002e2000 08:07 24249380                           /system/framework/arm64/boot-telephony-common.oat
73231000-73238000 r--p 00000000 08:07 24249383                           /system/framework/arm64/boot-voip-common.oat
73238000-73245000 r-xp 00007000 08:07 24249383                           /system/framework/arm64/boot-voip-common.oat
73245000-73246000 rw-p 00000000 00:00 0
73246000-73247000 r--p 00014000 08:07 24249383                           /system/framework/arm64/boot-voip-common.oat
73247000-73248000 rw-p 00015000 08:07 24249383                           /system/framework/arm64/boot-voip-common.oat
73248000-73250000 r--p 00000000 08:07 24249368                           /system/framework/arm64/boot-ims-common.oat
73250000-73261000 r-xp 00008000 08:07 24249368                           /system/framework/arm64/boot-ims-common.oat
73261000-73262000 rw-p 00000000 00:00 0
73262000-73263000 r--p 00019000 08:07 24249368                           /system/framework/arm64/boot-ims-common.oat
73263000-73264000 rw-p 0001a000 08:07 24249368                           /system/framework/arm64/boot-ims-common.oat
73264000-7328b000 r--p 00000000 08:07 24249377                           /system/framework/arm64/boot-org.apache.http.legacy.boot.oat
7328b000-732fd000 r-xp 00027000 08:07 24249377                           /system/framework/arm64/boot-org.apache.http.legacy.boot.oat
732fd000-732fe000 rw-p 00000000 00:00 0
732fe000-732ff000 r--p 00099000 08:07 24249377                           /system/framework/arm64/boot-org.apache.http.legacy.boot.oat
732ff000-73300000 rw-p 0009a000 08:07 24249377                           /system/framework/arm64/boot-org.apache.http.legacy.boot.oat
73300000-73303000 r--p 00000000 08:07 24249344                           /system/framework/arm64/boot-android.hidl.base-V1.0-java.oat
73303000-73304000 r-xp 00003000 08:07 24249344                           /system/framework/arm64/boot-android.hidl.base-V1.0-java.oat
73304000-73305000 r--p 00004000 08:07 24249344                           /system/framework/arm64/boot-android.hidl.base-V1.0-java.oat
73305000-73306000 rw-p 00005000 08:07 24249344                           /system/framework/arm64/boot-android.hidl.base-V1.0-java.oat
73306000-7330a000 r--p 00000000 08:07 24249347                           /system/framework/arm64/boot-android.hidl.manager-V1.0-java.oat
7330a000-7330e000 r-xp 00004000 08:07 24249347                           /system/framework/arm64/boot-android.hidl.manager-V1.0-java.oat
7330e000-7330f000 rw-p 00000000 00:00 0
7330f000-73310000 r--p 00008000 08:07 24249347                           /system/framework/arm64/boot-android.hidl.manager-V1.0-java.oat
73310000-73311000 rw-p 00009000 08:07 24249347                           /system/framework/arm64/boot-android.hidl.manager-V1.0-java.oat
73311000-73391000 rw-p 00000000 00:01 1196722747                         /dev/ashmem/dalvik-zygote space (deleted)
73391000-73392000 rw-p 00000000 00:01 1196723032                         /dev/ashmem/dalvik-non moving space (deleted)
73392000-7339c000 rw-p 00001000 00:01 1196723032                         /dev/ashmem/dalvik-non moving space (deleted)
7339c000-76312000 ---p 0000b000 00:01 1196723032                         /dev/ashmem/dalvik-non moving space (deleted)
76312000-77311000 rw-p 02f81000 00:01 1196723032                         /dev/ashmem/dalvik-non moving space (deleted)
77311000-97311000 rw-p 00000000 00:01 1196722752                         /dev/ashmem/dalvik-free list large object space (deleted)
97311000-99311000 rw-p 00000000 00:01 1196778296                         /dev/ashmem/dalvik-data-code-cache (deleted)
99311000-9b311000 r-xp 00000000 00:01 1196778297                         /dev/ashmem/dalvik-jit-code-cache (deleted)
ebad6000-ebad7000 ---p 00000000 00:01 1196724876                         /dev/ashmem/dalvik-Sentinel fault page (deleted)
31e153e7f000-31e153e9f000 rw-p 00000000 00:00 0
bbaa5c8aa000-bbaa5c8af000 r-xp 00000000 08:07 49209508                   /system/bin/app_process64
bbaa5c8af000-bbaa5c8b0000 r--p 00004000 08:07 49209508                   /system/bin/app_process64
bbaa5c8b0000-bbaa5c8b1000 rw-p 00005000 08:07 49209508                   /system/bin/app_process64

Я заметил, что между /dev/ashmem/ и /system/bin/app_process64 существует большой разрыв (ebad7000-31e153e7f000) , есть ли кто-нибудь, кто может помочь мне выяснить причину? спасибо~

Подробнее здесь: https://stackoverflow.com/questions/654 ... ut-problem