Re: port_info crashes when called concurrently by two processes

Adding more information,
this is related to SMP, if starting the erlang VM with -smp disable it does not crash.
---
Cheers,
Heinz Nikolaus Gies
[email protected]



> On Mar 11, 2015, at 17:15, Ryan Zezeski <[email protected]> wrote:
> 
> 
> 
> On Wed, Mar 11, 2015 at 11:53 AM, Heinz Nikolaus Gies <[email protected] <mailto:[email protected]>> wrote:
> Hi there is a problem with port_info it segfaults the erlang VM when two processes are executing it in parallel. We’ve been tracking this for the last two days and condensed the a crashing test down to this:
> 
> https://gist.github.com/Licenser/41a7ffe5ca52f57a169c <https://gist.github.com/Licenser/41a7ffe5ca52f57a169c>
> 
> Ryan has some crash dumps:
> 
> fffffd7ff6406670 collect_heap_frags.isra.7+0x90()
> fffffd7ff6406ba0 erts_garbage_collect+0x28f()
> fffffd7ff6406bd0 erts_gc_after_bif_call+0xa4()
> fffffd7ff6406f10 process_main+0x45da()
> fffffd7ff6406f70 sched_thread_func+0xef()
> fffffd7ff6406fb0 thr_wrapper+0x73()
> fffffd7ff6406fe0 libc.so.1`_thrp_setup+0x8a(fffffd7ffd2a5a40)
> fffffd7ff6406ff0 libc.so.1`_lwp_start()
> fffffd7ff6207af0 copy_struct+0xb5()
> fffffd7ff6207ba0 erts_port_info+0x292()
> fffffd7ff6207bd0 erts_internal_port_info_1+0xeb()
> fffffd7ff6207f10 process_main+0x45a9()
> fffffd7ff6207f70 sched_thread_func+0xef()
> fffffd7ff6207fb0 thr_wrapper+0x73()
> fffffd7ff6207fe0 libc.so.1`_thrp_setup+0x8a(fffffd7ffd2a6240)
> fffffd7ff6207ff0 libc.so.1`_lwp_start()
> fffffd7ff73fe670 sweep_one_area+0x58()
> fffffd7ff73feba0 erts_garbage_collect+0x985()
> fffffd7ff73febd0 erts_gc_after_bif_call+0xa4()
> fffffd7ff73fef10 process_main+0x45da()
> fffffd7ff73fef70 sched_thread_func+0xef()
> fffffd7ff73fefb0 thr_wrapper+0x73()
> fffffd7ff73fefe0 libc.so.1`_thrp_setup+0x8a(fffffd7ffd2a1a40)
> fffffd7ff73feff0 libc.so.1`_lwp_start()
> ```
> 
> zezeski <https://lucera.slack.com/team/rzezeski>[14:4
> ​
> 
> 
> 
> ​Just to give more information: here's some info from a crash dump of the simple reproducer Heinz linked above. I simply used the chunter erl (16B02) to run this program, the chunter application is not actually running.
> 
> This is the situation we see most often but occasionally I've seen the copy.c `copy_struct` function try to reference an address that is _above_ the stack, i.e. not even legal.
> 
>     > ::status
>     debugging core file of beam.smp (64-bit) from sys76
>     file: /opt/chunter/erts-5.10.3/bin/beam.smp
>     initial argv: /opt/chunter/erts-5.10.3/bin/beam.smp -- -root /opt/chunter -progname erl -- -h
>     threading model: native threads
>     status: process terminated by SIGSEGV (Segmentation Fault), addr=fffffd7ffc540000
> 
>     > $C
>     fffffd7ff8805670 collect_heap_frags.isra.7+0x95()
>     fffffd7ff8805ba0 erts_garbage_collect+0x115c()
>     fffffd7ff8805bd0 erts_gc_after_bif_call+0xa4()
>     fffffd7ff8805f10 process_main+0x45da()
>     fffffd7ff8805f70 sched_thread_func+0xef()
>     fffffd7ff8805fb0 thr_wrapper+0x73()
>     fffffd7ff8805fe0 libc.so.1`_thrp_setup+0x8a(fffffd7ffee6a240)
>     fffffd7ff8805ff0 libc.so.1`_lwp_start()
> 
>     > ::stacks
>     THREAD           STATE    SOBJ                COUNT
>     4                PARKED   CV                     10
>                      libc.so.1`cond_wait_queue+0x5b
>                      libc.so.1`__cond_wait+0xb3
>                      libc.so.1`cond_wait+0x2a
>                      libc.so.1`pthread_cond_wait+0x15
>                      ethr_event_wait+0x63
>                      async_main+0x275
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     f                PARKED   CV                      9
>                      libc.so.1`cond_wait_queue+0x5b
>                      libc.so.1`__cond_wait+0xb3
>                      libc.so.1`cond_wait+0x2a
>                      libc.so.1`pthread_cond_wait+0x15
>                      ethr_event_wait+0x63
>                      schedule+0x220d
>                      process_main+0x143
>                      sched_thread_func+0xef
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     16               UNPARKED <NONE>                  1
>                      erts_garbage_collect+0x115c
>                      erts_gc_after_bif_call+0xa4
>                      process_main+0x45da
>                      sched_thread_func+0xef
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     17               UNPARKED <NONE>                  1
>                      libc.so.1`mutex_lock_impl+0x189
>                      libc.so.1`mutex_lock+0x13
>                      spawn_start+0x46c
>                      erts_open_driver+0x21e
>                      open_port+0xa52
>                      open_port_2+0x2d
>                      process_main+0x45a9
>                      sched_thread_func+0xef
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     1                UNPARKED <NONE>                  1
>                      libc.so.1`pselect+0x1cb
>                      libc.so.1`select+0x5a
>                      erts_sys_main_thread+0x20
>                      erl_start+0xcfe
>                      main+9
>                      _start+0x6c
> 
>     e                UNPARKED <NONE>                  1
>                      libc.so.1`waitpid+0x3b
>                      child_waiter+0x30
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     2                UNPARKED <NONE>                  1
>                      signal_dispatcher_thread_func+0x29
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     15               UNPARKED <NONE>                  1
>                      spawn_start+0x60b
>                      erts_open_driver+0x21e
>                      open_port+0xa52
>                      open_port_2+0x2d
>                      process_main+0x45a9
>                      sched_thread_func+0xef
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     3                PARKED   CV                      1
>                      libc.so.1`cond_wait_queue+0x5b
>                      libc.so.1`__cond_wait+0xb3
>                      libc.so.1`cond_wait+0x2a
>                      libc.so.1`pthread_cond_wait+0x15
>                      ethr_cond_wait+9
>                      sys_msg_dispatcher_func+0xdf
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start
> 
>     1b               PARKED   CV                      1
>                      libc.so.1`cond_wait_queue+0x5b
>                      libc.so.1`__cond_wait+0xb3
>                      libc.so.1`cond_wait+0x2a
>                      libc.so.1`pthread_cond_wait+0x15
>                      ethr_event_wait+0x63
>                      aux_thread+0x1cd
>                      thr_wrapper+0x73
>                      libc.so.1`_thrp_setup+0x8a
>                      libc.so.1`_lwp_start​
> 
> 
> ​And finally here's the VA space mapping:
> 
>     # pmap /cores/core.beam.smp.92077
>     core '/cores/core.beam.smp.92077' of 92077:     /opt/chunter/erts-5.10.3/bin/beam.smp -- -root /opt/chunter -progname
>     0000000000400000       2652K r-x--  /opt/chunter/erts-5.10.3/bin/beam.smp
>     00000000006A6000        296K rw---  /opt/chunter/erts-5.10.3/bin/beam.smp
>     00000000006F0000       1276K rw---    [ heap ]
>     FFFFFD7FF6000000       2560K rw---    [ anon ]
>     FFFFFD7FF6A00000       8192K rw---    [ anon ]
>     FFFFFD7FF72C0000       1024K rw---    [ anon ]
>     FFFFFD7FF7A00000       1024K rw---    [ anon ]
>     FFFFFD7FF7E0A000          4K rw---    [ stack tid=27 ]
>     FFFFFD7FF8009000          4K rw---    [ stack tid=26 ]
>     FFFFFD7FF8208000          4K rw---    [ stack tid=25 ]
>     FFFFFD7FF8407000          4K rw---    [ stack tid=24 ]
>     FFFFFD7FF85FB000          8K rw---    [ anon ]
>     FFFFFD7FF8604000         12K rw---    [ stack tid=23 ]
>     FFFFFD7FF8804000          8K rw---    [ stack tid=22 ]
>     FFFFFD7FF8A03000          8K rw---    [ stack tid=21 ]
>     FFFFFD7FF8C02000          8K rw---    [ stack tid=20 ]
>     FFFFFD7FF8E02000          4K rw---    [ stack tid=19 ]
>     FFFFFD7FF9001000          4K rw---    [ stack tid=18 ]
>     FFFFFD7FF9200000          4K rw---    [ stack tid=17 ]
>     FFFFFD7FF93FF000          4K rw---    [ stack tid=16 ]
>     FFFFFD7FF95FE000          4K rw---    [ stack tid=15 ]
>     FFFFFD7FF9600000       4096K rw---    [ anon ]
>     FFFFFD7FF9AC0000        256K rw---    [ anon ]
>     FFFFFD7FF9C00000       4096K rw---    [ anon ]
>     FFFFFD7FFA1FE000          4K rw---    [ stack tid=3 ]
>     FFFFFD7FFA200000       2048K rw---    [ anon ]
>     FFFFFD7FFA4C0000        256K rw---    [ anon ]
>     FFFFFD7FFA540000       1024K rw---    [ anon ]
>     FFFFFD7FFA83E000          4K rw---    [ stack tid=2 ]
>     FFFFFD7FFA840000        512K rw---    [ anon ]
>     FFFFFD7FFA900000        256K rw---    [ anon ]
>     FFFFFD7FFA980000        256K rw---    [ anon ]
>     FFFFFD7FFAA00000        256K rw---    [ anon ]
>     FFFFFD7FFAA80000        256K rw---    [ anon ]
>     FFFFFD7FFAB00000        256K rw---    [ anon ]
>     FFFFFD7FFAB80000        256K rw---    [ anon ]
>     FFFFFD7FFAC00000        256K rw---    [ anon ]
>     FFFFFD7FFAC80000        256K rw---    [ anon ]
>     FFFFFD7FFAD00000        256K rw---    [ anon ]
>     FFFFFD7FFAD80000        256K rw---    [ anon ]
>     FFFFFD7FFAE00000        256K rw---    [ anon ]
>     FFFFFD7FFAE80000        256K rw---    [ anon ]
>     FFFFFD7FFAF00000        256K rw---    [ anon ]
>     FFFFFD7FFAF80000        256K rw---    [ anon ]
>     FFFFFD7FFB000000        256K rw---    [ anon ]
>     FFFFFD7FFB080000        256K rw---    [ anon ]
>     FFFFFD7FFB100000        256K rw---    [ anon ]
>     FFFFFD7FFB180000        256K rw---    [ anon ]
>     FFFFFD7FFB200000        256K rw---    [ anon ]
>     FFFFFD7FFB280000        256K rw---    [ anon ]
>     FFFFFD7FFB300000        256K rw---    [ anon ]
>     FFFFFD7FFB380000        256K rw---    [ anon ]
>     FFFFFD7FFB400000        256K rw---    [ anon ]
>     FFFFFD7FFB480000        256K rw---    [ anon ]
>     FFFFFD7FFB500000        256K rw---    [ anon ]
>     FFFFFD7FFB580000        256K rw---    [ anon ]
>     FFFFFD7FFB600000        256K rw---    [ anon ]
>     FFFFFD7FFB680000        256K rw---    [ anon ]
>     FFFFFD7FFB700000        256K rw---    [ anon ]
>     FFFFFD7FFB780000        256K rw---    [ anon ]
>     FFFFFD7FFB800000        256K rw---    [ anon ]
>     FFFFFD7FFB880000        256K rw---    [ anon ]
>     FFFFFD7FFB900000        256K rw---    [ anon ]
>     FFFFFD7FFB980000        256K rw---    [ anon ]
>     FFFFFD7FFBA00000        256K rw---    [ anon ]
>     FFFFFD7FFBA80000        256K rw---    [ anon ]
>     FFFFFD7FFBB00000        256K rw---    [ anon ]
>     FFFFFD7FFBB80000        256K rw---    [ anon ]
>     FFFFFD7FFBC00000        256K rw---    [ anon ]
>     FFFFFD7FFBC80000        256K rw---    [ anon ]
>     FFFFFD7FFBD00000        256K rw---    [ anon ]
>     FFFFFD7FFBD80000        256K rw---    [ anon ]
>     FFFFFD7FFBE00000        256K rw---    [ anon ]
>     FFFFFD7FFBE80000        256K rw---    [ anon ]
>     FFFFFD7FFBF00000        256K rw---    [ anon ]
>     FFFFFD7FFBF80000        256K rw---    [ anon ]
>     FFFFFD7FFC000000        256K rw---    [ anon ]
>     FFFFFD7FFC080000        256K rw---    [ anon ]
>     FFFFFD7FFC100000        256K rw---    [ anon ]
>     FFFFFD7FFC180000        256K rw---    [ anon ]
>     FFFFFD7FFC200000        256K rw---    [ anon ]
>     FFFFFD7FFC280000        256K rw---    [ anon ]
>     FFFFFD7FFC300000        256K rw---    [ anon ]
>     FFFFFD7FFC380000        256K rw---    [ anon ]
>     FFFFFD7FFC400000        256K rw---    [ anon ]
>     FFFFFD7FFC480000        256K rw---    [ anon ]
>     FFFFFD7FFC500000        256K rw---    [ anon ]
>     FFFFFD7FFC580000        256K rw---    [ anon ]
>     FFFFFD7FFC600000        256K rw---    [ anon ]
>     FFFFFD7FFC680000        256K rw---    [ anon ]
>     FFFFFD7FFC700000        256K rw---    [ anon ]
>     FFFFFD7FFC780000        256K rw---    [ anon ]
>     FFFFFD7FFC800000       4096K rw---    [ anon ]
>     FFFFFD7FFCC40000        256K rw---    [ anon ]
>     FFFFFD7FFCCC0000        256K rw---    [ anon ]
>     FFFFFD7FFCD40000        256K rw---    [ anon ]
>     FFFFFD7FFCDC0000        256K rw---    [ anon ]
>     FFFFFD7FFCE40000        256K rw---    [ anon ]
>     FFFFFD7FFCEC0000        256K rw---    [ anon ]
>     FFFFFD7FFCF40000        256K rw---    [ anon ]
>     FFFFFD7FFCFC0000        256K rw---    [ anon ]
>     FFFFFD7FFD040000        256K rw---    [ anon ]
>     FFFFFD7FFD0C0000        256K rw---    [ anon ]
>     FFFFFD7FFD140000        256K rw---    [ anon ]
>     FFFFFD7FFD1C0000        256K rw---    [ anon ]
>     FFFFFD7FFD240000        256K rw---    [ anon ]
>     FFFFFD7FFD2C0000        256K rw---    [ anon ]
>     FFFFFD7FFD340000        256K rw---    [ anon ]
>     FFFFFD7FFD3C0000        256K rw---    [ anon ]
>     FFFFFD7FFD440000        256K rw---    [ anon ]
>     FFFFFD7FFD4C0000        256K rw---    [ anon ]
>     FFFFFD7FFD540000        256K rw---    [ anon ]
>     FFFFFD7FFD5C0000        256K rw---    [ anon ]
>     FFFFFD7FFD640000        256K rw---    [ anon ]
>     FFFFFD7FFD6C0000        256K rw---    [ anon ]
>     FFFFFD7FFD740000        256K rw---    [ anon ]
>     FFFFFD7FFD7C0000       1024K rw---    [ anon ]
>     FFFFFD7FFD900000       1024K rw---    [ anon ]
>     FFFFFD7FFDA40000       1024K rw---    [ anon ]
>     FFFFFD7FFDB80000       1024K rw---    [ anon ]
>     FFFFFD7FFDCC0000       1024K rw---    [ anon ]
>     FFFFFD7FFDE00000       1024K rw---    [ anon ]
>     FFFFFD7FFDF40000       1024K rw---    [ anon ]
>     FFFFFD7FFE080000       1024K rw---    [ anon ]
>     FFFFFD7FFE1C0000       1024K rw---    [ anon ]
>     FFFFFD7FFE2D0000        352K r-x--  /usr/gnu/lib/amd64/libncurses.so.5.7
>     FFFFFD7FFE337000         20K rw---  /usr/gnu/lib/amd64/libncurses.so.5.7
>     FFFFFD7FFE340000         32K r-x--  /lib/amd64/librtld_db.so.1
>     FFFFFD7FFE358000          4K rw---  /lib/amd64/librtld_db.so.1
>     FFFFFD7FFE380000        580K r-x--  /usr/lib/amd64/libdtrace.so.1
>     FFFFFD7FFE421000         84K rw---  /usr/lib/amd64/libdtrace.so.1
>     FFFFFD7FFE436000         12K rw---  /usr/lib/amd64/libdtrace.so.1
>     FFFFFD7FFE440000          4K r-x--  /lib/amd64/libsendfile.so.1
>     FFFFFD7FFE451000          4K rw---  /lib/amd64/libsendfile.so.1
>     FFFFFD7FFE480000        256K rw---    [ anon ]
>     FFFFFD7FFE500000       1024K rw---    [ anon ]
>     FFFFFD7FFE630000          8K r-x--  /lib/amd64/libkstat.so.1
>     FFFFFD7FFE642000          4K rw---  /lib/amd64/libkstat.so.1
>     FFFFFD7FFE680000        256K rw---    [ anon ]
>     FFFFFD7FFE6E0000         20K r-x--  /lib/amd64/libmp.so.2
>     FFFFFD7FFE6F5000          4K rw---  /lib/amd64/libmp.so.2
>     FFFFFD7FFE700000         60K r-x--  /usr/lib/amd64/libgcc_s.so.1
>     FFFFFD7FFE71E000          4K rw---  /usr/lib/amd64/libgcc_s.so.1
>     FFFFFD7FFE71F000          4K r-x--  /lib/amd64/libdl.so.1
>     FFFFFD7FFE730000          4K rwx--    [ anon ]
>     FFFFFD7FFE740000         32K r-x--  /lib/amd64/libmd.so.1
>     FFFFFD7FFE758000          4K rw---  /lib/amd64/libmd.so.1
>     FFFFFD7FFE760000          8K r-x--  /usr/lib/amd64/libsctp.so.1
>     FFFFFD7FFE772000          4K rw---  /usr/lib/amd64/libsctp.so.1
>     FFFFFD7FFE780000       1024K rw---    [ anon ]
>     FFFFFD7FFE8BE000          4K rw---    [ stack tid=13 ]
>     FFFFFD7FFE8C0000       1024K rw---    [ anon ]
>     FFFFFD7FFE9EB000          4K rw---    [ stack tid=12 ]
>     FFFFFD7FFE9ED000         12K r-x--  /lib/amd64/libpthread.so.1
>     FFFFFD7FFEA1B000          4K rw---    [ stack tid=11 ]
>     FFFFFD7FFEA3E000          4K rw---    [ stack tid=10 ]
>     FFFFFD7FFEA40000         28K r-x--  /lib/amd64/libdlpi.so.1
>     FFFFFD7FFEA57000          4K rw---  /lib/amd64/libdlpi.so.1
>     FFFFFD7FFEA60000         68K r-x--  /lib/amd64/libsocket.so.1
>     FFFFFD7FFEA81000          4K rw---  /lib/amd64/libsocket.so.1
>     FFFFFD7FFEABE000          4K rw---    [ stack tid=9 ]
>     FFFFFD7FFEAC0000       1024K rw---    [ anon ]
>     FFFFFD7FFEBE0000        476K r-x--  /lib/amd64/libumem.so.1
>     FFFFFD7FFEC66000          4K rwx--  /lib/amd64/libumem.so.1
>     FFFFFD7FFEC77000        144K rw---  /lib/amd64/libumem.so.1
>     FFFFFD7FFEC9B000         44K rw---  /lib/amd64/libumem.so.1
>     FFFFFD7FFECC0000          4K rwx--    [ anon ]
>     FFFFFD7FFECEB000          4K rw---    [ stack tid=8 ]
>     FFFFFD7FFED0E000          4K rw---    [ stack tid=7 ]
>     FFFFFD7FFED10000        532K r-x--  /lib/amd64/libnsl.so.1
>     FFFFFD7FFEDA5000         12K rw---  /lib/amd64/libnsl.so.1
>     FFFFFD7FFEDA8000         32K rw---  /lib/amd64/libnsl.so.1
>     FFFFFD7FFEDDB000          4K rw---    [ stack tid=6 ]
>     FFFFFD7FFEDFE000          4K rw---    [ stack tid=5 ]
>     FFFFFD7FFEE00000        256K rw---    [ anon ]
>     FFFFFD7FFEE50000          4K rwx--    [ anon ]
>     FFFFFD7FFEE60000         64K rwx--    [ anon ]
>     FFFFFD7FFEE80000        256K rw---    [ anon ]
>     FFFFFD7FFEED5000          4K rw---    [ stack tid=14 ]
>     FFFFFD7FFEEE0000        396K r-x--  /lib/amd64/libm.so.2
>     FFFFFD7FFEF53000          8K rw---  /lib/amd64/libm.so.2
>     FFFFFD7FFEF7E000          4K rw---    [ stack tid=4 ]
>     FFFFFD7FFEF80000        256K rw---    [ anon ]
>     FFFFFD7FFEFD0000          4K r----*   [ anon ]
>     FFFFFD7FFEFE0000         64K rw---    [ anon ]
>     FFFFFD7FFF000000        256K rw---    [ anon ]
>     FFFFFD7FFF052000        128K rw---    [ anon ]
>     FFFFFD7FFF073000          4K rwx--    [ anon ]
>     FFFFFD7FFF080000         64K rwx--    [ anon ]
>     FFFFFD7FFF0A0000          4K rwx--    [ anon ]
>     FFFFFD7FFF0B0000         24K rwx--    [ anon ]
>     FFFFFD7FFF0C0000          4K rwx--    [ anon ]
>     FFFFFD7FFF0D0000          4K rwx--    [ anon ]
>     FFFFFD7FFF0E0000       1516K r-x--  /lib/amd64/libc.so.1
>     FFFFFD7FFF26B000         44K rw---  /lib/amd64/libc.so.1
>     FFFFFD7FFF276000         16K rw---  /lib/amd64/libc.so.1
>     FFFFFD7FFF280000          4K rw---    [ anon ]
>     FFFFFD7FFF290000          4K rwx--    [ anon ]
>     FFFFFD7FFF2A0000          4K rwx--    [ anon ]
>     FFFFFD7FFF2B0000          4K rw---    [ anon ]
>     FFFFFD7FFF2C0000          4K rwx--    [ anon ]
>     FFFFFD7FFF2D0000          4K rwx--    [ anon ]
>     FFFFFD7FFF2E0000          4K rwx--    [ anon ]
>     FFFFFD7FFF2F0000          4K rwx--    [ anon ]
>     FFFFFD7FFF300000          4K rwx--    [ anon ]
>     FFFFFD7FFF310000          4K rwx--    [ anon ]
>     FFFFFD7FFF320000          4K rwx--    [ anon ]
>     FFFFFD7FFF330000          4K rwx--    [ anon ]
>     FFFFFD7FFF340000          4K rwx--    [ anon ]
>     FFFFFD7FFF350000          4K rwx--    [ anon ]
>     FFFFFD7FFF360000          4K rw---    [ anon ]
>     FFFFFD7FFF370000          4K rw---    [ anon ]
>     FFFFFD7FFF380000          4K rwx--    [ anon ]
>     FFFFFD7FFF390000          4K rwx--    [ anon ]
>     FFFFFD7FFF398000        332K r-x--  /lib/amd64/ld.so.1
>     FFFFFD7FFF3FB000          8K rwx--  /lib/amd64/ld.so.1
>     FFFFFD7FFF3FD000          8K rwx--  /lib/amd64/ld.so.1
>     FFFFFD7FFFDFD000         12K rw---    [ stack ]
>              total        75540K
> 
> ​

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