[Mono-dev] Crosscompiling Mono 5.0.0.100

Bernhard Urban beurba at microsoft.com
Tue May 23 21:17:03 UTC 2017


alas that isn't useful :(  for some reason the system fails somewhere in libc.

can you do `thread apply all bt` in gdb? ideally, you pass `-O0 -g` as CFLAGS so you'll get proper line numbers.
________________________________________
From: Angelo Compagnucci <angelo.compagnucci at gmail.com>
Sent: Tuesday, May 23, 2017 11:04:01 PM
To: Bernhard Urban
Cc: Mono-devel-list at lists.ximian.com
Subject: Re: [Mono-dev] Crosscompiling Mono 5.0.0.100

Dearh Bernhard,

2017-05-23 19:54 GMT+02:00 Bernhard Urban <beurba at microsoft.com>:
>  >      Host:          arm-buildroot-linux-gnueabi
>  >      Target:        arm-buildroot-linux-gnueabi
>
> so... you aren't actually cross-compiling, am I right?

I'm actually crosscompiling inside buildroot wich somewhat cheats.

> That's weird then, configure should pick up all the right settings. I'm curious to see the emitted code around the crash site. If you use gdb, something like `x/100i $pc-0x40` should do the trick.


=================================================================
Got a SIGILL while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================


Thread 1 "mono-sgen" received signal SIGABRT, Aborted.
0xb6cede50 in raise () from /lib/libc.so.6
(gdb) x/100i $pc-0x40
   0xb6cede10 <ssignal+196>:    andseq  r1, r1, r12, ror #8
   0xb6cede14 <ssignal+200>:
                ; <UNDEFINED> instruction: 0x0010e2b8
   0xb6cede18 <raise>:  push    {r7, lr}
   0xb6cede1c <raise+4>:        mov     r2, r0
   0xb6cede20 <raise+8>:        bl      0xb6cd8650
   0xb6cede24 <raise+12>:       ldr     r1, [r0, #-1112]        ; 0xfffffba8
   0xb6cede28 <raise+16>:       mov     r12, r0
   0xb6cede2c <raise+20>:       cmp     r1, #0
   0xb6cede30 <raise+24>:       ldr     r0, [r0, #-1108]        ; 0xfffffbac
   0xb6cede34 <raise+28>:       bne     0xb6cede64 <raise+76>
   0xb6cede38 <raise+32>:       mov     r7, #224        ; 0xe0
   0xb6cede3c <raise+36>:       svc     0x00000000
   0xb6cede40 <raise+40>:       mov     r1, r0
   0xb6cede44 <raise+44>:       str     r0, [r12, #-1112]       ; 0xfffffba8
   0xb6cede48 <raise+48>:       mov     r7, #268        ; 0x10c
   0xb6cede4c <raise+52>:       svc     0x00000000
=> 0xb6cede50 <raise+56>:       cmn     r0, #4096       ; 0x1000
   0xb6cede54 <raise+60>:       mov     r3, r0
   0xb6cede58 <raise+64>:       bhi     0xb6cede80 <raise+104>
   0xb6cede5c <raise+68>:       mov     r0, r3
   0xb6cede60 <raise+72>:       pop     {r7, pc}
   0xb6cede64 <raise+76>:       cmp     r0, #0
---Type <return> to continue, or q <return> to quit---
   0xb6cede68 <raise+80>:       bgt     0xb6cede48 <raise+48>
   0xb6cede6c <raise+84>:       bic     r3, r0, #-2147483648    ; 0x80000000
   0xb6cede70 <raise+88>:       cmp     r3, #0
   0xb6cede74 <raise+92>:       rsbne   r0, r0, #0
   0xb6cede78 <raise+96>:       moveq   r0, r1
   0xb6cede7c <raise+100>:      b       0xb6cede48 <raise+48>
   0xb6cede80 <raise+104>:
    ldr r2, [pc, #20]   ; 0xb6cede9c <raise+132>
   0xb6cede84 <raise+108>:      rsb     r1, r0, #0
   0xb6cede88 <raise+112>:      ldr     r2, [pc, r2]
   0xb6cede8c <raise+116>:      bl      0xb6cd8650
   0xb6cede90 <raise+120>:      mvn     r3, #0
   0xb6cede94 <raise+124>:      str     r1, [r0, r2]
   0xb6cede98 <raise+128>:      b       0xb6cede5c <raise+68>
   0xb6cede9c <raise+132>:      andseq  lr, r0, r8, lsr #4
   0xb6cedea0 <killpg>: cmp     r0, #0
   0xb6cedea4 <killpg+4>:       push    {lr}            ; (str lr, [sp, #-4]!)
   0xb6cedea8 <killpg+8>:       blt     0xb6cedeb8 <killpg+24>
   0xb6cedeac <killpg+12>:      rsb     r0, r0, #0
   0xb6cedeb0 <killpg+16>:      pop     {lr}            ; (ldr lr, [sp], #4)
   0xb6cedeb4 <killpg+20>:      b       0xb6cee120 <kill>
   0xb6cedeb8 <killpg+24>:
    ldr r3, [pc, #20]   ; 0xb6ceded4 <killpg+52>
---Type <return> to continue, or q <return> to quit---
   0xb6cedebc <killpg+28>:      bl      0xb6cd8650
   0xb6cedec0 <killpg+32>:      ldr     r3, [pc, r3]
   0xb6cedec4 <killpg+36>:      mov     r2, #22
   0xb6cedec8 <killpg+40>:      str     r2, [r0, r3]
   0xb6cedecc <killpg+44>:      mvn     r0, #0
   0xb6ceded0 <killpg+48>:      pop     {pc}            ; (ldr pc, [sp], #4)
   0xb6ceded4 <killpg+52>:
                ; <UNDEFINED> instruction: 0x0010e1f0
   0xb6ceded8:  push    {r4, r5, r6, r7, lr}
   0xb6cededc:  ldr     r6, [pc, #324]  ; 0xb6cee028
   0xb6cedee0:  subs    r5, r1, #0
   0xb6cedee4:  sub     sp, sp, #284    ; 0x11c
   0xb6cedee8:  mov     r7, r0
   0xb6cedeec:  mov     r4, r2
   0xb6cedef0:  add     r6, pc, r6
   0xb6cedef4:  beq     0xb6cedf28
   0xb6cedef8:  mov     r1, r5
   0xb6cedefc:  ldr     r3, [r1], #4
   0xb6cedf00:  add     r0, sp, #12
   0xb6cedf04:  mov     r2, #128        ; 0x80
   0xb6cedf08:  str     r3, [sp]
   0xb6cedf0c:  bl      0xb6d3d7a0 <memcpy>
   0xb6cedf10:  ldr     r3, [r5, #132]  ; 0x84
---Type <return> to continue, or q <return> to quit---
   0xb6cedf14:  str     r3, [sp, #4]
   0xb6cedf18:  tst     r3, #67108864   ; 0x4000000
   0xb6cedf1c:  beq     0xb6cedfa8
   0xb6cedf20:  ldr     r3, [r5, #136]  ; 0x88
   0xb6cedf24:  str     r3, [sp, #8]
   0xb6cedf28:  cmp     r4, #0
   0xb6cedf2c:  addne   r2, sp, #140    ; 0x8c
   0xb6cedf30:  moveq   r2, r4
   0xb6cedf34:  cmp     r5, #0
   0xb6cedf38:  mov     r0, r7
   0xb6cedf3c:  movne   r1, sp
   0xb6cedf40:  moveq   r1, r5
   0xb6cedf44:  mov     r3, #8
   0xb6cedf48:  mov     r7, #174        ; 0xae
   0xb6cedf4c:  svc     0x00000000
   0xb6cedf50:  cmn     r0, #4096       ; 0x1000
   0xb6cedf54:  mov     r5, r0
   0xb6cedf58:  bhi     0xb6cee00c
   0xb6cedf5c:  adds    r3, r4, #0
   0xb6cedf60:  movne   r3, #1
   0xb6cedf64:  cmp     r0, #0
   0xb6cedf68:  movlt   r3, #0
   0xb6cedf6c:  cmp     r3, #0
---Type <return> to continue, or q <return> to quit---
   0xb6cedf70:  beq     0xb6cedf9c
   0xb6cedf74:  ldr     r3, [sp, #140]  ; 0x8c
   0xb6cedf78:  mov     r0, r4
   0xb6cedf7c:  str     r3, [r0], #4
   0xb6cedf80:  mov     r2, #128        ; 0x80
   0xb6cedf84:  add     r1, sp, #152    ; 0x98
   0xb6cedf88:  bl      0xb6d3d7a0 <memcpy>
   0xb6cedf8c:  ldr     r2, [sp, #144]  ; 0x90
   0xb6cedf90:  ldr     r3, [sp, #148]  ; 0x94
   0xb6cedf94:  str     r2, [r4, #132]  ; 0x84
   0xb6cedf98:  str     r3, [r4, #136]  ; 0x88
   0xb6cedf9c:  mov     r0, r5

The file command reports:

/usr/bin/mono-sgen: ELF 32-bit LSB executable, ARM, EABI5 version 1
(SYSV), dynamically linked, interpreter /lib/ld-linux.so.3, for
GNU/Linux 2.6.16, stripped

So the cross compilation went well.

Sincerely, Angelo

>
> -Bernhard
> ________________________________________
> From: Angelo Compagnucci <angelo.compagnucci at gmail.com>
> Sent: Tuesday, May 23, 2017 6:35:06 PM
> To: Bernhard Urban
> Cc: Mono-devel-list at lists.ximian.com
> Subject: Re: [Mono-dev] Crosscompiling Mono 5.0.0.100
>
> Hello Bernhard,
>
> The recpie is this one:
>
> ################################################################################
> #
> # mono
> #
> ################################################################################
>
> MONO_VERSION = 5.0.0.100
> MONO_SITE = https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdownload.mono-project.com%2Fsources%2Fmono&data=02%7C01%7Cbeurba%40microsoft.com%7C25ae3075088c4b176de708d4a1f9c451%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636311541495053555&sdata=gh4wrnniTrAEH5C7lGkDBF8dLLusjvGNkJR9KCkHzH4%3D&reserved=0
> MONO_SOURCE = mono-$(MONO_VERSION).tar.bz2
> MONO_LICENSE = GPL-2.0 or MIT (compiler, tools), MIT (libs) or commercial
> MONO_LICENSE_FILES = LICENSE mcs/COPYING eglib/COPYING \
>     external/Newtonsoft.Json/Tools/7-zip/copying.txt
> MONO_INSTALL_STAGING = YES
>
> ## Mono native
>
> # patching configure.ac
> MONO_AUTORECONF = YES
>
> # Disable managed code (mcs folder) from building
> MONO_CONF_OPTS = --with-mcs-docs=no \
>     --with-ikvm-native=no \
>     --enable-minimal=profiler,aot \
>     --disable-mcs-build \
>     --with-xen_opt=no \
>     --disable-btls \
>     --enable-static
>
> # The libraries have been built by the host-mono build. Since they are
> # architecture-independent, we simply copy them to the target.
> define MONO_INSTALL_LIBS
>     rsync -av --exclude=*.so --exclude=*.mdb \
>         $(HOST_DIR)/usr/lib/mono $(TARGET_DIR)/usr/lib/
> endef
>
> MONO_POST_INSTALL_TARGET_HOOKS += MONO_INSTALL_LIBS
>
> ifeq ($(BR2_PACKAGE_LIBICONV),y)
> MONO_DEPENDENCIES += libiconv
> endif
>
> MONO_DEPENDENCIES += host-mono
>
> ## Mono managed
>
> HOST_MONO_CONF_OPTS = --with-mcs-docs=no \
>     --disable-libraries \
>     --with-ikvm-native=no \
>     --enable-minimal=profiler,aot \
>     --with-xen_opt=no \
>     --disable-btls \
>     --enable-static
>
> # ensure monolite is used
> HOST_MONO_MAKE_OPTS += EXTERNAL_MCS=false
>
> HOST_MONO_DEPENDENCIES = host-monolite host-gettext
>
> define HOST_MONO_SETUP_MONOLITE
>     rm -rf $(@D)/mcs/class/lib/monolite
>     (cd $(@D)/mcs/class/lib; ln -s $(HOST_DIR)/usr/lib/monolite monolite)
> endef
>
> HOST_MONO_POST_CONFIGURE_HOOKS += HOST_MONO_SETUP_MONOLITE
>
> $(eval $(autotools-package))
> $(eval $(host-autotools-package))
>
>
> The package is compiled in two phases: the first compiles host-mono,
> which in reality only compiles the libraries using monolite. Then the
> recipe compiles mono native.
> All the cross compiling options is passed to the recipe by buildroot.
>
> Configure output:
>
>         mcs source:    mcs
>         C# Compiler:   roslyn
>
>    Engine:
>         Host:          arm-buildroot-linux-gnueabi
>         Target:        arm-buildroot-linux-gnueabi
>         GC:            sgen (concurrent by default) and Included Boehm
> GC with typed GC and parallel mark
>         TLS:           __thread
>         SIGALTSTACK:   yes
>         Engine:        Building and using the JIT
>         BigArrays:     no
>         DTrace:        no
>         LLVM Back End: no (dynamically loaded: no)
>         Interpreter:   no
>
>    Libraries:
>         .NET 4.x:        no
>         Xamarin.Android: no
>         Xamarin.iOS:     no
>         Xamarin.WatchOS: no
>         Xamarin.TVOS:    no
>         Xamarin.Mac:     no
>         Windows AOT:     no
>         Orbis:           no
>         Test profiles:   AOT Full (no), AOT Hybrid (no)
>         JNI support:
>         libgdiplus:      assumed to be installed
>         zlib:
>         BTLS:            no
>         Disabled:      profiler,aot
>
>
> Consider that the same recipe with mono 4.8.1.0 works like expected.
>
> Sincerely, Angelo
>
> 2017-05-23 18:21 GMT+02:00 Bernhard Urban <beurba at microsoft.com>:
>> How does your configure line look like and what's the output?
>>
>> -Bernhard
>> ________________________________________
>> From: Angelo Compagnucci <angelo.compagnucci at gmail.com>
>> Sent: Tuesday, May 23, 2017 6:07:07 PM
>> To: Bernhard Urban
>> Cc: Mono-devel-list at lists.ximian.com
>> Subject: Re: [Mono-dev] Crosscompiling Mono 5.0.0.100
>>
>> Hello Bernhard,
>>
>> 2017-05-23 17:21 GMT+02:00 Bernhard Urban <beurba at microsoft.com>:
>>> Hello Angelo,
>>>
>>> could you install gdb (or lldb) on your target?  It looks like the target device doesn't support some instructions that mono generates (hence SIGILL). It would be useful to get a native stack trace, or a disassembly around the crash site.
>>
>> I have gdb but I'm not having success with a backtrace, I'll try more!
>>
>>> What CPU architecture/platform are you targeting?
>>
>> Qemu versatile, so it's an ARM926EJ-S
>>
>>> That might be helpful as well: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.mono-project.com%2Fdocs%2Fdebug%2Bprofile%2Fdebug%2F&data=02%7C01%7Cbeurba%40microsoft.com%7C843ac485cb334abb79e208d4a1f5db83%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636311524711368693&sdata=ZWTL2w5DPPR2ldn8JWj6wV5FxTGLpKSijP6VG8DpNu0%3D&reserved=0
>>
>> I'm looking at it!
>>
>> Thanks!
>>
>>>
>>>
>>> -Bernhard
>>> ________________________________________
>>> From: Mono-devel-list <mono-devel-list-bounces at lists.dot.net> on behalf of Angelo Compagnucci <angelo.compagnucci at gmail.com>
>>> Sent: Tuesday, May 23, 2017 2:43:48 PM
>>> To: Mono-devel-list at lists.ximian.com
>>> Subject: [Mono-dev] Crosscompiling Mono 5.0.0.100
>>>
>>> Hello developers,
>>>
>>> I'm trying to crosscompile mono for qemu versatile with the buildroot
>>> crosscompiling system. More precisely, I'm trying to update the recipe
>>> bundled with buildroot for mono 4.8.1.100.
>>> I'm actually not a novice in this sort of thing, I actually
>>> contributed the recipe in the first place and contributed several
>>> patches to the mono build system to be cross compilable and musl
>>> compatible.
>>>
>>> Actually I have a working recipe, the same one i use for 4.8.1.100 and
>>> which works, and I can successfully compile mono 5.0.0.100.
>>>
>>> Unfortunately, compiling a simple hello world produces this error:
>>>
>>> # mcs hello.cs
>>> Stacktrace:
>>>
>>>   at <unknown> <0xffffffff>
>>>   at Mono.SafeStringMarshal.get_Value () [0x0001a] in
>>> <a1ccf43d50c94435a9f0fcab25017dca>:0
>>>   at System.Environment.internalGetEnvironmentVariable (string)
>>> [0x0000c] in <a1ccf43d50c94435a9f0fcab25017dca>:0
>>>   at System.Environment.GetEnvironmentVariable (string) [0x00000] in
>>> <a1ccf43d50c94435a9f0fcab25017dca>:0
>>>   at Mono.CSharp.Driver.Main (string[]) [0x00000] in
>>> <65e20f41151e464c8d313246de15d1a3>:0
>>>   at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object
>>> (object,intptr,intptr,intptr) [0x00054] in
>>> <65e20f41151e464c8d313246de15d1a3>:0
>>> /proc/self/maps:
>>> 00008000-00299000 r-xp 00000000 08:00 3367       /usr/bin/mono-sgen
>>> 002a0000-002a2000 rwxp 00290000 08:00 3367       /usr/bin/mono-sgen
>>> 002a2000-0033b000 rwxp 00000000 00:00 0          [heap]
>>> b4c91000-b4f09000 r-xp 00000000 08:00 3263
>>> /usr/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll
>>> b4f09000-b5000000 r-xp 00000000 08:00 2599
>>> /usr/lib/mono/gac/System.Core/4.0.0.0__b77a5c561934e089/System.Core.dll
>>> b5000000-b5021000 rwxp 00000000 00:00 0
>>> b5021000-b5100000 ---p 00000000 00:00 0
>>> b51a9000-b51aa000 ---p 00000000 00:00 0
>>> b51aa000-b52a9000 rwxp 00000000 00:00 0
>>> b52a9000-b5652000 r-xp 00000000 08:00 1491       /usr/lib/mono/4.5/mscorlib.dll
>>> b5652000-b5800000 r-xp 00000000 08:00 1270       /usr/lib/mono/4.5/mcs.exe
>>> b5800000-b6000000 rwxp 00000000 00:00 0
>>> b6000000-b6001000 ---p 00000000 00:00 0
>>> b6001000-b6c00000 rwxp 00000000 00:00 0
>>> b6c70000-b6cf0000 rwxp 00000000 00:00 0
>>> b6cf2000-b6d0b000 rwxp 00000000 00:00 0
>>> b6d0b000-b6d3a000 ---p 00000000 00:00 0
>>> b6d3a000-b6d4a000 rwxp 00000000 00:00 0
>>> b6d4a000-b6e7d000 r-xp 00000000 08:00 3567       /lib/libc-2.18.so
>>> b6e7d000-b6e84000 ---p 00133000 08:00 3567       /lib/libc-2.18.so
>>> b6e84000-b6e86000 r-xp 00132000 08:00 3567       /lib/libc-2.18.so
>>> b6e86000-b6e87000 rwxp 00134000 08:00 3567       /lib/libc-2.18.so
>>> b6e87000-b6e8a000 rwxp 00000000 00:00 0
>>> b6e8a000-b6eab000 r-xp 00000000 08:00 543        /lib/libgcc_s.so.1
>>> b6eab000-b6eb2000 ---p 00021000 08:00 543        /lib/libgcc_s.so.1
>>> b6eb2000-b6eb3000 rwxp 00020000 08:00 543        /lib/libgcc_s.so.1
>>> b6eb3000-b6ec9000 r-xp 00000000 08:00 991        /lib/libpthread-2.18.so
>>> b6ec9000-b6ed0000 ---p 00016000 08:00 991        /lib/libpthread-2.18.so
>>> b6ed0000-b6ed1000 r-xp 00015000 08:00 991        /lib/libpthread-2.18.so
>>> b6ed1000-b6ed2000 rwxp 00016000 08:00 991        /lib/libpthread-2.18.so
>>> b6ed2000-b6ed4000 rwxp 00000000 00:00 0
>>> b6ed4000-b6ed8000 r-xp 00000000 08:00 209        /lib/libdl-2.18.so
>>> b6ed8000-b6edf000 ---p 00004000 08:00 209        /lib/libdl-2.18.so
>>> b6edf000-b6ee0000 r-xp 00003000 08:00 209        /lib/libdl-2.18.so
>>> b6ee0000-b6ee1000 rwxp 00004000 08:00 209        /lib/libdl-2.18.so
>>> b6ee1000-b6ee7000 r-xp 00000000 08:00 1327       /lib/librt-2.18.so
>>> b6ee7000-b6eee000 ---p 00006000 08:00 1327       /lib/librt-2.18.so
>>> b6eee000-b6eef000 r-xp 00005000 08:00 1327       /lib/librt-2.18.so
>>> b6eef000-b6ef0000 rwxp 00006000 08:00 1327       /lib/librt-2.18.so
>>> b6ef0000-b6f8d000 r-xp 00000000 08:00 207        /lib/libm-2.18.so
>>> b6f8d000-b6f95000 ---p 0009d000 08:00 207        /lib/libm-2.18.so
>>> b6f95000-b6f96000 r-xp 0009d000 08:00 207        /lib/libm-2.18.so
>>> b6f96000-b6f97000 rwxp 0009e000 08:00 207        /lib/libm-2.18.so
>>> b6f97000-b6fb7000 r-xp 00000000 08:00 2447       /lib/ld-2.18.so
>>> b6fb7000-b6fb8000 rwxp 00000000 00:00 0
>>> b6fb8000-b6fb9000 rwxs 00000000 00:0c 225        /dev/shm/mono.110
>>> b6fb9000-b6fba000 ---p 00000000 00:00 0
>>> b6fba000-b6fbb000 r-xp 00000000 00:00 0
>>> b6fbb000-b6fbe000 rwxp 00000000 00:00 0
>>> b6fbe000-b6fbf000 r-xp 0001f000 08:00 2447       /lib/ld-2.18.so
>>> b6fbf000-b6fc0000 rwxp 00020000 08:00 2447       /lib/ld-2.18.so
>>> bec63000-bec84000 rw-p 00000000 00:00 0          [stack]
>>> bee69000-bee6a000 r-xp 00000000 00:00 0          [sigpage]
>>> ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]
>>>
>>> Native stacktrace:
>>>
>>>
>>> Debug info from gdb:
>>>
>>> mono_gdb_render_native_backtraces not supported on this platform,
>>> unable to find gdb or lldb
>>>
>>> =================================================================
>>> Got a SIGILL while executing native code. This usually indicates
>>> a fatal error in the mono runtime or one of the native libraries
>>> used by your application.
>>> =================================================================
>>>
>>> Aborted
>>>
>>>
>>> I've not followed too closely the latests development bits for mono 5
>>> and I'm asking you some advice to understand what's going on.
>>>
>>> Thank your for your time!
>>>
>>> --
>>> Profile: https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fit.linkedin.com%2Fin%2Fcompagnucciangelo&data=02%7C01%7Cbeurba%40microsoft.com%7C45f4a2e117e24f05457c08d4a1d977cd%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636311402805633277&sdata=5c%2B%2FVLvlqXKfMT%2FrWza5OzHG6rIOTizHCIx%2BNO5FPWc%3D&reserved=0
>>> _______________________________________________
>>> Mono-devel-list mailing list
>>> Mono-devel-list at lists.dot.net
>>> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.dot.net%2Fmailman%2Flistinfo%2Fmono-devel-list&data=02%7C01%7Cbeurba%40microsoft.com%7C45f4a2e117e24f05457c08d4a1d977cd%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636311402805633277&sdata=9BYjnZLHRW%2FzaNJWZ88dN%2BSfPka1fDh51ooKtzA2aGM%3D&reserved=0
>>
>>
>>
>> --
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