Comments (14)
Argh, yeah I think this is my fault. I'll give you a patch to test today.
I wouldn't expect that to actually segfault though. Does it still fault
without voltron?
On Tue, May 19, 2015 at 8:46 AM, ocean [email protected] wrote:
os: Ubuntu 15.04 gdb: GNU gdb (Ubuntu 7.9-1ubuntu1) 7.9
elf file is
https://github.com/ctfs/write-ups-2015/tree/master/defcon-qualifier-ctf-2015/reverse/pr0dk3yi do load the file with gdb: gdb ./pr0dk3y_40687b492c80205cccb34db1eabf6456
bp *0 to break as soon as it executes then info file, bpd 1 and bp
*entry_point (this is to break on entry point since the elf has PIE)it will break and seems to work but as soon as i single step one or at
most two instructions (either si/ni) gdb will segfault:0x0000555555554a65 in ?? ()
/build/buildd/gdb-7.9/gdb/common/cleanups.c:265: internal-warning: restore_my_cleanups has found a stale cleanup
A problem internal to GDB has been detected,
further debugging may prove unreliable.This is a bug, please report it. For instructions, see:
http://www.gnu.org/software/gdb/bugs/.[1] 5903 abort (core dumped) gdb pr0dk3y_40687b492c80205cccb34db1eabf6456
or:
Traceback (most recent call last):
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 215, in run
rfds, _, _ = select.select([serv, self.exit_pipe] + self.clients, [], [])
InterruptedError: [Errno 4] Chiamata di sistema interrottaDuring handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
self.run()
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 218, in run
if ex[0] == errno.EINTR: # interrupted system call
TypeError: 'InterruptedError' object is not subscriptable0x0000555555554a84 in ?? ()```
here is my gdb-init:
voltron init #source ~/.fg_gdbinit``` i did both import and remove https://github.com/gdbinit/Gdbinit but still keeps on crashing. — Reply to this email directly or view it on GitHub https://github.com/snare/voltron/issues/81.
from voltron.
I pushed the ocean-debug branch to richo/voltron. This patch is definitely
not something that should go upstream, but can you let me know if it fixes
the bug, and I can do something less ghetto.
On Tue, May 19, 2015 at 8:53 AM, Richo Healey [email protected] wrote:
Argh, yeah I think this is my fault. I'll give you a patch to test today.
I wouldn't expect that to actually segfault though. Does it still fault
without voltron?On Tue, May 19, 2015 at 8:46 AM, ocean [email protected] wrote:
os: Ubuntu 15.04 gdb: GNU gdb (Ubuntu 7.9-1ubuntu1) 7.9
elf file is
https://github.com/ctfs/write-ups-2015/tree/master/defcon-qualifier-ctf-2015/reverse/pr0dk3yi do load the file with gdb: gdb
./pr0dk3y_40687b492c80205cccb34db1eabf6456
bp *0 to break as soon as it executes then info file, bpd 1 and bp
*entry_point (this is to break on entry point since the elf has PIE)it will break and seems to work but as soon as i single step one or at
most two instructions (either si/ni) gdb will segfault:0x0000555555554a65 in ?? ()
/build/buildd/gdb-7.9/gdb/common/cleanups.c:265: internal-warning: restore_my_cleanups has found a stale cleanup
A problem internal to GDB has been detected,
further debugging may prove unreliable.This is a bug, please report it. For instructions, see:
http://www.gnu.org/software/gdb/bugs/.[1] 5903 abort (core dumped) gdb pr0dk3y_40687b492c80205cccb34db1eabf6456
or:
Traceback (most recent call last):
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 215, in run
rfds, _, _ = select.select([serv, self.exit_pipe] + self.clients, [], [])
InterruptedError: [Errno 4] Chiamata di sistema interrottaDuring handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.4/threading.py", line 920, in _bootstrap_inner
self.run()
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 218, in run
if ex[0] == errno.EINTR: # interrupted system call
TypeError: 'InterruptedError' object is not subscriptable0x0000555555554a84 in ?? ()```
here is my gdb-init:
voltron init #source ~/.fg_gdbinit``` i did both import and remove https://github.com/gdbinit/Gdbinit but still keeps on crashing. — Reply to this email directly or view it on GitHub https://github.com/snare/voltron/issues/81.
from voltron.
it does still crash, tough it lasts a few ni
more (obviously without voltron it doesn't crash), this is the backtrace from the core dump:
#0 0x00007f796ab47267 in __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:55
#1 0x00007f796ab48eca in __GI_abort () at abort.c:89
#2 0x0000000000680f96 in dump_core ()
#3 0x000000000068353d in ?? ()
#4 0x00000000006835f9 in internal_verror ()
#5 0x00000000006b41ff in internal_error ()
#6 0x00000000005ad7dc in ?? ()
#7 0x000000000059664a in ?? ()
#8 0x000000000067ec7c in execute_command ()
#9 0x000000000067ed6b in execute_command_to_string ()
#10 0x00000000004f5fec in ?? ()
#11 0x00007f796bb3500f in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#12 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#13 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#14 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#15 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#16 0x00007f796babb496 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#17 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#18 0x00007f796bb31b8b in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#19 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#20 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#21 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#22 0x00007f796babb496 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#23 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#24 0x00007f796bb31b8b in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#25 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#26 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#27 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#28 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#29 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#30 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#31 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#32 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#33 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#34 0x00007f796babb3a9 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#35 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#36 0x00007f796bb8e1ad in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#37 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#38 0x00007f796bb2dab7 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#39 0x00007f796bb70df2 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#40 0x00007f796b7756aa in start_thread (arg=0x7f7965b0a700) at pthread_create.c:333
#41 0x00007f796ac18eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
from voltron.
could you install the gdb-dbg package so that those other frames get
annotated?
On Tue, May 19, 2015 at 9:39 AM, ocean [email protected] wrote:
it does still crash, tough it lasts a few ni more (obviously without
voltron it doesn't crash):#0 0x00007f796ab47267 in __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:55
#1 0x00007f796ab48eca in __GI_abort () at abort.c:89
#2 0x0000000000680f96 in dump_core ()
#3 0x000000000068353d in ?? ()
#4 0x00000000006835f9 in internal_verror ()
#5 0x00000000006b41ff in internal_error ()
#6 0x00000000005ad7dc in ?? ()
#7 0x000000000059664a in ?? ()
#8 0x000000000067ec7c in execute_command ()
#9 0x000000000067ed6b in execute_command_to_string ()
#10 0x00000000004f5fec in ?? ()
#11 0x00007f796bb3500f in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#12 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#13 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#14 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#15 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#16 0x00007f796babb496 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#17 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#18 0x00007f796bb31b8b in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#19 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#20 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#21 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#22 0x00007f796babb496 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#23 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#24 0x00007f796bb31b8b in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#25 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#26 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#27 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#28 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#29 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#30 0x00007f796bb34d66 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#31 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#32 0x00007f796bb34ebb in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#33 0x00007f796bb36cf3 in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#34 0x00007f796babb3a9 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#35 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#36 0x00007f796bb8e1ad in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#37 0x00007f796bb3b138 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#38 0x00007f796bb2dab7 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#39 0x00007f796bb70df2 in ?? () from /usr/lib/x86_64-linux-gnu/libpython3.4m.so.1.0
#40 0x00007f796b7756aa in start_thread (arg=0x7f7965b0a700) at pthread_create.c:333
#41 0x00007f796ac18eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109—
Reply to this email directly or view it on GitHub
#81 (comment).
from voltron.
this is the backtrace: http://pastebin.com/mCYygFKq
sometimes the error changes:
Using the running image of child process 5003.
Program stopped at 0x555555554a6d.
It stopped after being stepped.
[1] 4373 segmentation fault (core dumped) gdb pr0dk3y_40687b492c80205cccb34db1eabf6456
0x00005555555549d0 in __libc_start_main@plt ()
gdb$ Fatal Python error: This thread state must be current when releasing
Thread 0x00007f861e338700 (most recent call first):
File "/usr/lib/python3.4/threading.py", line 290 in wait
File "/usr/lib/python3.4/threading.py", line 553 in wait
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/plugins/api/wait.py", line 49 in dispatch
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/api.py", line 100 in inner
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 163 in dispatch_request
File "/usr/lib/python3.4/threading.py", line 868 in run
File "/usr/lib/python3.4/threading.py", line 920 in _bootstrap_inner
File "/usr/lib/python3.4/threading.py", line 888 in _bootstrap
Current thread 0x00007f861f33a700 (most recent call first):
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 486 in send
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 532 in send_response
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 175 in dispatch_request
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 136 in handle_request
File "/usr/local/lib/python3.4/dist-packages/voltron-0.1-py3.4.egg/voltron/core.py", line 242 in run
File "/usr/lib/python3.4/threading.py", line 920 in _bootstrap_inner
File "/usr/lib/python3.4/threading.py", line 888 in _bootstrap
Thread 0x00007f862679d780 (most recent call first):
[1] 6779 abort (core dumped) gdb pr0dk3y_40687b492c80205cccb34db1eabf6456
0x0000555555554a65 in ?? ()
/build/buildd/gdb-7.9/gdb/common/cleanups.c:265: internal-warning: restore_my_cleanups has found a stale cleanup
A problem internal to GDB has been detected,
further debugging may prove unreliable.
*** Error in `gdb': free(): invalid pointer: 0x00000000007c18c0 ***
[1] 2509 segmentation fault (core dumped) gdb pr0dk3y_40687b492c80205cccb34db1eabf6456
from voltron.
yet two other backtraces which look different:
http://pastebin.com/SF0bDjFg this one trying to execute reg read
from fg! gdbinit
http://pastebin.com/FbGADJXm this one just stepping
I did notice also that sometimes gdb hangs on quit
command and I've got to kill it, and only a few rare times it quits correctly but showing an error statement: Python Exception <class 'AttributeError'> 'NoneType' object has no attribute 'stop': `Python Exception <class 'AttributeError'> 'NoneType' object has no attribute 'stop':``.
Could it be some problem with gdb cleanups (maybe even python garbage collector)?
from voltron.
@richo : I asked on freenode #gdb referring to this bug report and they told me this: "from the backtrace at that link I see you're doing gdb operations from a separate thread." I don't know if this is actually true because I'm still digging inside voltron source but it's worth investigating this.
from voltron.
That is true, Voltron does its queries from a background thread in the debugger. This was never a problem before but has started causing problems in GDB in recent versions.
On 21 May 2015, at 6:46 am, ocean [email protected] wrote:
@richo https://github.com/richo : I asked on freenode #gdb referring to this bug report and they told me this: "from the backtrace at that link I see you're doing gdb operations from a separate thread." I don't know if this is actually true because I'm still digging inside voltron source but it's worth investigating this.
—
Reply to this email directly or view it on GitHub #81 (comment).
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@ocean1 just to clarify, did they also follow that up with "don't do that"?
from voltron.
Reworking the core comms stuff at the moment and will attempt to solve this issue.
from voltron.
yes @snare, sorry but I didn't notice the last message, the GDB docs are clear about this, it is needed to call gdb commands only on the main thread! :) glad to hear you are trying to fix it.
from voltron.
Awesome thanks
from voltron.
Pushed out a version that should work on Linux w/GDB (tested on some random Ubuntu VM I had - I think from memory it's 14.04). There's a few bugs that I need to iron out still (e.g. it hangs for ~10s when first running the inferior) but it should be working if you wanna give it a run.
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"Fixed" by reworking the API so it can optionally block on the back end, in which case the request is added to a queue that is processed on the main thread each time the debugger stops. If the debugger is deemed to support async actions then they are performed immediately on a background thread, so we don't lose any functionality on LLDB (like updating views immediately upon launch etc).
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