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classification
Title: Crash caused by certain characters in a string
Type: crash Stage: resolved
Components: Versions: Python 3.7
process
Status: closed Resolution: fixed
Dependencies: Superseder:
Assigned To: Nosy List: cwickens, iritkatriel, paul.moore, steve.dower, terry.reedy, tim.golden, xtreak, zach.ware
Priority: normal Keywords:

Created on 2018-10-07 10:04 by cwickens, last changed 2022-04-11 14:59 by admin. This issue is now closed.

Files
File name Uploaded Description Edit
py37bug-master.zip cwickens, 2018-10-07 10:04
Python_2018-10-13-141913_Karthikeyans-MacBook-Air.crash xtreak, 2018-10-13 08:55
Messages (9)
msg327270 - (view) Author: (cwickens) Date: 2018-10-07 10:04 
Clone the following repo and follow the repro steps described in the readme: https://github.com/oTree-org/py37bug

It seems that using certain non-ASCII characters in parts of a string crashes Python. In the README I listed the strings that are OK and those that crash.

Also attaching the repo.
msg327291 - (view) Author: Karthikeyan Singaravelan (xtreak) * (Python committer) Date: 2018-10-07 16:57 
Thanks for the report. Can you please try this with 3.7.0 RC1 to see if it's reproducible? I think this similar to issue34087 that was present only in 3.7 and master which also has a Django project. There was a similar report with issue34241 with a similar Django project POC causing this in the templates layer.

3.7.0 RC1 : https://www.python.org/downloads/release/python-370rc1/
msg327603 - (view) Author: Terry J. Reedy (terry.reedy) * (Python committer) Date: 2018-10-12 17:24 
The report is based on a crash running the otree plugin (proper term?) for the Django framework.  For a bug to be our responsibility, it must be present in the cpython repository, and should be reproducible without installing 3rd party modules.  For instance, while #34807 and #34241 reported crashes while using Django, the test added to the test suite involved a trivial expression:
   int/float/complex('\u3053\u3093\u306b\u3061\u306f')

The fix in #34807 was merged after 3.7.0 was released, hence the request to test with 3.7.1rc1 (or the upcoming soon 3.7.1rc2) or an updated clone.

The literal "¿AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" by itself does not cause a crash.  If the crash persists with 3.7.1, please  find the code that processes the label string and extract the minimal code that results in a crash.
msg327629 - (view) Author: (cwickens) Date: 2018-10-13 06:46 
OK thank you for the explanations. It does indeed sound a lot like issue 34241. I will test as soon as I get a chance. Anyway, I am OK with this bug being closed.
msg327630 - (view) Author: Karthikeyan Singaravelan (xtreak) * (Python committer) Date: 2018-10-13 07:04 
Just noticed that you have mentioned that it doesn't crash in Linux in the GitHub repo. I tried the same in Ubuntu and if it's due to the mentioned issue I think it should crash in Linux too. Anyway it's worth giving 3.7RC1 a try to validate this. You can also attach the core dump stack trace file if possible. Unfortunately, I don't have a Windows machine to test this.

Thanks
msg327634 - (view) Author: (cwickens) Date: 2018-10-13 08:16 
Actually I was mistaken: it does reproduce with 3.7.0 on MacOS. I just tried it again; I guess the first time I must have copied the problematic string incorrectly (as even changing by 1 char seems to affect whether it crashes).

Below is the crash report. Anyway, my next step will be to try with the 3.7.1 RC. Though I guess I need to uninstall my existing 3.7 and I wonder how this will affect my existing projects and virtualenvs.

Process:               Python [558]
Path:                  /Library/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python
Identifier:            Python
Version:               3.7.0 (3.7.0)
Code Type:             X86-64 (Native)
Parent Process:        bash [476]
Responsible:           Terminal [467]
User ID:               502

Date/Time:             2018-10-13 16:59:09.845 +0900
OS Version:            Mac OS X 10.11.2 (15C50)
Report Version:        11
Anonymous UUID:        091D73EC-486B-5A63-9222-A9291F26FB6E


Time Awake Since Boot: 330 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       EXC_I386_GPFLT

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   org.python.python                   0x00000001017f75aa pymalloc_alloc + 74
1   org.python.python                   0x00000001017f5493 _PyObject_Calloc + 35
2   org.python.python                   0x00000001017d1cdb PyList_New + 123
3   org.python.python                   0x00000001017d4758 list_subscript + 280
4   org.python.python                   0x00000001017a1068 PyObject_GetItem + 72
5   org.python.python                   0x0000000101871514 _PyEval_EvalFrameDefault + 4596
6   org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
7   org.python.python                   0x00000001017b97e4 _PyFunction_FastCallDict + 148
8   org.python.python                   0x00000001017bab4f _PyObject_FastCall_Prepend + 127
9   org.python.python                   0x000000010180ea00 slot_mp_subscript + 160
10  org.python.python                   0x00000001017a1068 PyObject_GetItem + 72
11  org.python.python                   0x0000000101871514 _PyEval_EvalFrameDefault + 4596
12  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
13  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
14  org.python.python                   0x00000001018795bb call_function + 795
15  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
16  org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
17  org.python.python                   0x00000001018795bb call_function + 795
18  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
19  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
20  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
21  org.python.python                   0x00000001018795bb call_function + 795
22  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
23  org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
24  org.python.python                   0x00000001018795bb call_function + 795
25  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
26  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
27  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
28  org.python.python                   0x00000001018795bb call_function + 795
29  org.python.python                   0x0000000101876560 _PyEval_EvalFrameDefault + 25152
30  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
31  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
32  org.python.python                   0x00000001018795bb call_function + 795
33  org.python.python                   0x0000000101876560 _PyEval_EvalFrameDefault + 25152
34  org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
35  org.python.python                   0x00000001018795bb call_function + 795
36  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
37  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
38  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
39  org.python.python                   0x00000001018795bb call_function + 795
40  org.python.python                   0x0000000101876560 _PyEval_EvalFrameDefault + 25152
41  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
42  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
43  org.python.python                   0x00000001018795bb call_function + 795
44  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
45  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
46  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
47  org.python.python                   0x00000001018795bb call_function + 795
48  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
49  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
50  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
51  org.python.python                   0x00000001018795bb call_function + 795
52  org.python.python                   0x0000000101876546 _PyEval_EvalFrameDefault + 25126
53  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
54  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
55  org.python.python                   0x00000001018795bb call_function + 795
56  org.python.python                   0x0000000101876546 _PyEval_EvalFrameDefault + 25126
57  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
58  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
59  org.python.python                   0x00000001018795bb call_function + 795
60  org.python.python                   0x0000000101876560 _PyEval_EvalFrameDefault + 25152
61  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
62  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
63  org.python.python                   0x00000001018795bb call_function + 795
64  org.python.python                   0x00000001018766a7 _PyEval_EvalFrameDefault + 25479
65  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
66  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
67  org.python.python                   0x00000001018795bb call_function + 795
68  org.python.python                   0x00000001018766a7 _PyEval_EvalFrameDefault + 25479
69  org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
70  org.python.python                   0x00000001018795bb call_function + 795
71  org.python.python                   0x0000000101876546 _PyEval_EvalFrameDefault + 25126
72  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
73  org.python.python                   0x00000001017b995b _PyFunction_FastCallDict + 523
74  org.python.python                   0x00000001017bac2f _PyObject_Call_Prepend + 143
75  org.python.python                   0x00000001017b9ee7 PyObject_Call + 135
76  org.python.python                   0x0000000101876871 _PyEval_EvalFrameDefault + 25937
77  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
78  org.python.python                   0x00000001017b995b _PyFunction_FastCallDict + 523
79  org.python.python                   0x00000001017bac2f _PyObject_Call_Prepend + 143
80  org.python.python                   0x00000001017b9ee7 PyObject_Call + 135
81  org.python.python                   0x0000000101876871 _PyEval_EvalFrameDefault + 25937
82  org.python.python                   0x00000001017ba1f0 function_code_fastcall + 128
83  org.python.python                   0x00000001018795bb call_function + 795
84  org.python.python                   0x0000000101876546 _PyEval_EvalFrameDefault + 25126
85  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
86  org.python.python                   0x00000001017b9d81 _PyFunction_FastCallKeywords + 257
87  org.python.python                   0x00000001018795bb call_function + 795
88  org.python.python                   0x0000000101876601 _PyEval_EvalFrameDefault + 25313
89  org.python.python                   0x000000010187a096 _PyEval_EvalCodeWithName + 2422
90  org.python.python                   0x0000000101870244 PyEval_EvalCode + 100
91  org.python.python                   0x00000001018ad041 PyRun_FileExFlags + 209
92  org.python.python                   0x00000001018ac8eb PyRun_SimpleFileExFlags + 859
93  org.python.python                   0x00000001018ca93c pymain_main + 8044
94  org.python.python                   0x00000001018cada1 _Py_UnixMain + 129
95  libdyld.dylib                       0x00007fff9b9395ad start + 1

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000103324000  rbx: 0x0000000000000000  rcx: 0x207463656a626f20  rdx: 0x000000010198c660
  rdi: 0x00007fff5e465380  rsi: 0x000000010198c670  rbp: 0x00007fff5e465370  rsp: 0x00007fff5e465340
   r8: 0xffffffffffffffff   r9: 0x00000001019f41e0  r10: 0x00000000000000ff  r11: 0x0015bba8bea50dc9
  r12: 0x0000000000000000  r13: 0x0000000102030e08  r14: 0x00007fff5e465380  r15: 0x0000000000000000
  rip: 0x00000001017f75aa  rfl: 0x0000000000010206  cr2: 0x00000001044a1020

Logical CPU:     0
Error Code:      0x00000000
Trap Number:     13


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    0x7fff92017000 -     0x7fff92018ffb  libremovefile.dylib (41) <B8D1A5FC-CFD5-3AAB-8A10-14DDC129710A> /usr/lib/system/libremovefile.dylib
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    0x7fff94d90000 -     0x7fff94d92ff7  libquarantine.dylib (80) <163CF63A-7455-3D1F-AE57-8C4475A9204C> /usr/lib/system/libquarantine.dylib
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    0x7fff9bc42000 -     0x7fff9bc5eff7  libsystem_malloc.dylib (67) <9EECAB18-F025-34C4-8E32-7EFFA6720EFC> /usr/lib/system/libsystem_malloc.dylib
    0x7fff9c0a7000 -     0x7fff9c0b2ff7  libcommonCrypto.dylib (60075.20.1) <766BC3F5-41F3-3315-BABC-72718A98EA92> /usr/lib/system/libcommonCrypto.dylib
    0x7fff9c3ac000 -     0x7fff9c3acff7  libkeymgr.dylib (28) <09397E01-6066-3179-A50C-2CE666FDA929> /usr/lib/system/libkeymgr.dylib
    0x7fff9cb03000 -     0x7fff9cf79fff  com.apple.CoreFoundation (6.9 - 1256.14) <068D1BA9-3859-34C7-986A-97EDF739C5C8> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
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    0x7fff9d5e5000 -     0x7fff9d5f6ff7  libz.1.dylib (61.20.1) <B3EBB42F-48E3-3287-9F0D-308E04D407AC> /usr/lib/libz.1.dylib
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    0x7fff9f4b1000 -     0x7fff9f4defff  libdispatch.dylib (501.20.1) <324C9189-2AF3-3356-847F-6F4CE1C6E901> /usr/lib/system/libdispatch.dylib
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External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 405
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=114.4M resident=0K(0%) swapped_out_or_unallocated=114.4M(100%)
Writable regions: Total=91.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=91.6M(100%)

                                VIRTUAL   REGION
REGION TYPE                        SIZE    COUNT (non-coalesced)
===========                     =======  =======
Activity Tracing                  2048K        2
Kernel Alloc Once                    4K        2
MALLOC                            72.8M       34
MALLOC guard page                   16K        4
MALLOC_LARGE (reserved)            384K        3         reserved VM address space (unallocated)
STACK GUARD                          4K        2
Stack                             16.0M        2
VM_ALLOCATE                          8K        3
__DATA                            4004K       89
__LINKEDIT                        92.9M       40
__TEXT                            21.5M       85
__UNICODE                          552K        2
shared memory                       12K        4
===========                     =======  =======
TOTAL                            210.1M      259
TOTAL, minus reserved VM space   209.8M      259

Model: Macmini7,1, BootROM MM71.0220.B06, 2 processors, Intel Core i5, 1.4 GHz, 4 GB, SMC 2.24f32
Graphics: Intel HD Graphics 5000, Intel HD Graphics 5000, Built-In
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1600 MHz, 0x80CE, 0x4B3445384533303445452D45474345000000
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1600 MHz, 0x80CE, 0x4B3445384533303445452D45474345000000
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x13B), Broadcom BCM43xx 1.0 (7.21.94.136.1a1)
Bluetooth: Version 4.4.3f4 16616, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: APPLE HDD HTS545050A7E362, 500.11 GB
USB Device: USB 3.0 Bus
USB Device: USB Receiver
USB Device: IR Receiver
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Kinesis Keyboard Hub
USB Device: Composite Device
Thunderbolt Bus: Mac mini, Apple Inc., 26.1
msg327639 - (view) Author: Karthikeyan Singaravelan (xtreak) * (Python committer) Date: 2018-10-13 08:55 
Thanks @cwickens for the confirmation. It's still weird that I used one of the problematic strings in the repo and it didn't crash with 3.7.0 on my Ubuntu machine. I tried testing with Mac OS again since you mentioned it was reproducible now. I cloned the repo and even with the normal repo it crashes with 3.7.0 on Mac. I installed 3.7.1 RC1 and it fixes the issue. 

Please find my testing as below with the default clone from git : 

Python 3.7.0 for Mac OS installed from python.org segfaults : 

➜  py37bug git:(master) python3.7 -m ../venv py37-venv
➜  py37bug git:(master) source ../venv py37-venv/bin/activate
(py37-venv) ➜  py37bug git:(master) python3.7
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 26 2018, 23:26:24)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^D
(py37-venv) ➜  py37bug git:(master) pip install otree
(py37-venv) ➜  py37bug git:(master) otree resetdb --noinput
[1]    2590 segmentation fault  otree resetdb --noinput


Python 3.7.1 RC 1 for Mac OS installed from python.org works fine : 

➜  py37bug git:(master) python3.7 -m ../venv py37-rc-1-venv
➜  py37bug git:(master) source ../venv py37-rc-1-venv/bin/activate
(py37-rc-1-venv) ➜  py37bug git:(master) python3.7
Python 3.7.1rc1 (v3.7.1rc1:2064bcf6ce, Sep 26 2018, 03:09:51)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> ^D
(py37-rc-1-venv) ➜  py37bug git:(master) pip install otree
(py37-rc-1-venv) ➜  py37bug git:(master) otree resetdb --noinput
INFO Database engine: SQLite
INFO Retrieving Existing Tables...
INFO Dropping Tables...
INFO Creating Database 'default'...
Operations to perform:
  Synchronize unmigrated apps: auth, channels, contenttypes, demoapp, djhuey, forms, idmap, messages, otree, sessions, staticfiles
  Apply all migrations: (none)
Synchronizing apps without migrations:
  Creating tables...
    Creating table otree_pagecompletion
    Creating table otree_pagetimeout
    Creating table otree_completedgroupwaitpage
    Creating table otree_completedsubsessionwaitpage
    Creating table otree_participanttoplayerlookup
    Creating table otree_participantlockmodel
    Creating table otree_undefinedformmodel
    Creating table otree_roomtosession
    Creating table otree_failedsessioncreation
    Creating table otree_participantroomvisit
    Creating table otree_browserbotslaunchersessioncode
    Creating table otree_chatmessage
    Creating table otree_session
    Creating table otree_participant
    Creating table auth_permission
    Creating table auth_group
    Creating table auth_user
    Creating table django_content_type
    Creating table django_session
    Creating table demoapp_subsession
    Creating table demoapp_group
    Creating table demoapp_player
    Running deferred SQL...
Running migrations:
  No migrations to apply.
INFO Created new tables and columns.

For some odd reason even with Python 3.7.0 installed the segfault still shows 3.7.1RC1 in my Mac OS report. I had RC1 installed first and then did an install of 3.7.0 for testing this so I don't know why it's not updated to 3.7.0 in the segfault but my tests show with 3.7.1RC1 it works fine. If you can try with 3.7.1 RC1 as you are available then it will be a helpful confirmation. Attaching the core dump similar to yours for reference.

Hope it helps. 

Thanks
msg327664 - (view) Author: Terry J. Reedy (terry.reedy) * (Python committer) Date: 2018-10-13 19:29 
An upgrade of the same version and bitness binary by the PSF Windows and Mac installers is done, by default, in place, so your Python scripts should not notice the difference, except for the bug fixes.  At least on Windows, downgrading requires uninstall, but one can choose to leave the directory and added files, including packages in site-packages, alone, so that installing the older maintenance version should again leave everything the same except for adding bugs back.
msg397038 - (view) Author: Irit Katriel (iritkatriel) * (Python committer) Date: 2021-07-06 13:42 
As per message https://bugs.python.org/issue34919#msg327639, the issue was fixed in 3.7.1.
History
Date User Action Args
2022-04-11 14:59:06adminsetgithub: 79100
2021-07-06 13:42:50iritkatrielsetstatus: open -> closed

nosy: + iritkatriel
messages: + msg397038

resolution: fixed
stage: resolved
2018-10-13 19:29:11terry.reedysetmessages: + msg327664
2018-10-13 08:55:55xtreaksetfiles: + Python_2018-10-13-141913_Karthikeyans-MacBook-Air.crash

messages: + msg327639
2018-10-13 08:16:54cwickenssetcomponents: - Windows
2018-10-13 08:16:33cwickenssetmessages: + msg327634
2018-10-13 07:04:26xtreaksetmessages: + msg327630
2018-10-13 06:46:17cwickenssetmessages: + msg327629
2018-10-12 17:24:01terry.reedysetnosy: + terry.reedy
messages: + msg327603
2018-10-07 16:57:07xtreaksetnosy: + xtreak
messages: + msg327291
2018-10-07 10:04:26cwickenscreate