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classification
Title: Segmentation Fault with Large Simple Function
Type: crash Stage: resolved
Components: Versions: Python 2.7
process
Status: closed Resolution: duplicate
Dependencies: Superseder: stack overflow evaluating eval("()" * 30000)
View: 5765
Assigned To: Nosy List: Michael Klein, SilentGhost, amaury.forgeotdarc, brett.cannon, ned.deily
Priority: normal Keywords:

Created on 2015-03-11 17:14 by Michael Klein, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Files
File name Uploaded Description Edit
test.py Michael Klein, 2015-03-11 17:13 Simple truth value counter
Messages (7)
msg237889 - (view) Author: Michael Klein (Michael Klein) Date: 2015-03-11 17:13 
I have gotten "Segmentation Fault: 11" with the newest version of Python 2.7 and nothing but standard functions. The program is of the following form (attached to this email):

def loopcountaux(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30, a31, a32, a33, a34, a35, a36, a37, a38, a39, a40, a41, a42, a43):

    loopcount = ((1-a36)*(a37)*(1-a41)) + ((a22)*(a33)*(1-a23)) + ((a27)*(a34)*(1-a28)) + ((a38)*(a43)*(1-a39)) + ((a40)*(a42)*(1-a41))+((1-a22)*(1-a33)*(a23)) + ((1-a27)*(1-a34)*(a28)) + ((1-a38)*(1-a43)*(a39)) + ((1-a40)*(1-a42)*(a41)) + ((a36)*(1-a37)*(a41))
    return loopcount

print loopcountaux(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1)

The only difference between this and the file which causes the fault is the number of formulas added to the line where "loopcount" is defined (74858 more of a similar kind). Note that this program finds the number of boolean formulas from a given set which are true for given variables a1, a2,... For example, "((1-a36)*(a37)*(1-a41))" is effectively the same as "(not a36) and (a37) and (not a41)".

If this example makes debugging particularly difficult, I can try to find a less complex example, though this example is just long enough to cause a segfault (with one less statement it runs well).

Thank you for your time.

The OSX error report is as follows:

Process:               Python [8151]
Path:                  /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier:            Python
Version:               2.7.9 (2.7.9)
Code Type:             X86-64 (Native)
Parent Process:        bash [3554]
Responsible:           Terminal [599]
User ID:               501

Date/Time:             2015-03-11 12:21:52.952 -0400
OS Version:            Mac OS X 10.10.2 (14C109)
Report Version:        11
Anonymous UUID:        49801587-229C-BA4D-0630-D2490825F5C7

Sleep/Wake UUID:       44D3FBEF-DC64-44CA-A10A-70E9E16AE5C2

Time Awake Since Boot: 160000 seconds
Time Since Wake:       17000 seconds

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

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_PROTECTION_FAILURE at 0x00007fff5f3ffff8

VM Regions Near 0x7fff5f3ffff8:
    MALLOC_SMALL           000000014e800000-0000000151000000 [ 40.0M] rw-/rwx SM=PRV  
--> STACK GUARD            00007fff5bc00000-00007fff5f400000 [ 56.0M] ---/rwx SM=NUL  stack guard for thread 0
    Stack                  00007fff5f400000-00007fff5fc00000 [ 8192K] rw-/rwx SM=COW  thread 0

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
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Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000100182c80  rbx: 0x0000000000000000  rcx: 0x0000000100070ea0  rdx: 0x0000000000000002
  rdi: 0x000000010030e2a8  rsi: 0x000000010030e2a8  rbp: 0x00007fff5f400000  rsp: 0x00007fff5f400000
   r8: 0x0000000000000002   r9: 0x0000000000000006  r10: 0x0000000000000000  r11: 0x000000010005a130
  r12: 0x00000001004c03f8  r13: 0x0000000000000002  r14: 0x00000001004c0440  r15: 0x0000000000000002
  rip: 0x000000010005d734  rfl: 0x0000000000010202  cr2: 0x00007fff5f3ffff8
  
Logical CPU:     2
Error Code:      0x00000006
Trap Number:     14


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    0x7fff89afe000 -     0x7fff89b0fff7  libz.1.dylib (55) <88C7C7DE-04B8-316F-8B74-ACD9F3DE1AA1> /usr/lib/libz.1.dylib
    0x7fff89b10000 -     0x7fff89b13ff7  libdyld.dylib (353.2.1) <4E33E416-F1D8-3598-B8CC-6863E2ECD0E6> /usr/lib/system/libdyld.dylib
    0x7fff8a1f0000 -     0x7fff8a1f1fff  libSystem.B.dylib (1213) <90B107BC-FF74-32CC-B1CF-4E02F544D957> /usr/lib/libSystem.B.dylib
    0x7fff8a35f000 -     0x7fff8a367fff  libsystem_platform.dylib (63) <64E34079-D712-3D66-9CE2-418624A5C040> /usr/lib/system/libsystem_platform.dylib
    0x7fff8a512000 -     0x7fff8a588fe7  libcorecrypto.dylib (233.1.2) <E1789801-3985-3949-B736-6B3378873301> /usr/lib/system/libcorecrypto.dylib
    0x7fff8bd61000 -     0x7fff8bd68ff7  libcompiler_rt.dylib (35) <BF8FC133-EE10-3DA6-9B90-92039E28678F> /usr/lib/system/libcompiler_rt.dylib
    0x7fff8c3c4000 -     0x7fff8c3caff7  libsystem_networkextension.dylib (167.1.10) <29AB225B-D7FB-30ED-9600-65D44B9A9442> /usr/lib/system/libsystem_networkextension.dylib
    0x7fff8d0f2000 -     0x7fff8d0f2ff7  libunc.dylib (29) <5676F7EA-C1DF-329F-B006-D2C3022B7D70> /usr/lib/system/libunc.dylib
    0x7fff8e4ba000 -     0x7fff8e500ff7  libauto.dylib (186) <A260789B-D4D8-316A-9490-254767B8A5F1> /usr/lib/libauto.dylib
    0x7fff8e8ee000 -     0x7fff8e8f6fff  libsystem_dnssd.dylib (561.1.1) <62B70ECA-E40D-3C63-896E-7F00EC386DDB> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff8efcd000 -     0x7fff8efeafff  libsystem_kernel.dylib (2782.10.72) <97CD7ACD-EA0C-3434-BEFC-FCD013D6BB73> /usr/lib/system/libsystem_kernel.dylib
    0x7fff8ff7b000 -     0x7fff8ff7bff7  libkeymgr.dylib (28) <77845842-DE70-3CC5-BD01-C3D14227CED5> /usr/lib/system/libkeymgr.dylib
    0x7fff90a05000 -     0x7fff90a91ff7  libsystem_c.dylib (1044.10.1) <199ED5EB-77A1-3D43-AA51-81779CE0A742> /usr/lib/system/libsystem_c.dylib
    0x7fff90a92000 -     0x7fff90e28fff  com.apple.CoreFoundation (6.9 - 1152) <CBD1591C-405E-376E-87E9-B264610EBF49> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7fff919c4000 -     0x7fff919fcffb  libsystem_network.dylib (411.1) <2EC3A005-473F-3C36-A665-F88B5BACC7F0> /usr/lib/system/libsystem_network.dylib
    0x7fff9208f000 -     0x7fff92091ff7  libsystem_sandbox.dylib (358.1.1) <95312E09-DA28-324A-A084-F3E574D0210E> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff9233a000 -     0x7fff9236afff  libsystem_m.dylib (3086.1) <1E12AB45-6D96-36D0-A226-F24D9FB0D9D6> /usr/lib/system/libsystem_m.dylib
    0x7fff9236b000 -     0x7fff92393fff  libxpc.dylib (559.10.3) <876216DC-D5D3-381E-8AF9-49AE464E5107> /usr/lib/system/libxpc.dylib
    0x7fff92680000 -     0x7fff92681fff  libsystem_secinit.dylib (18) <581DAD0F-6B63-3A48-B63B-917AF799ABAA> /usr/lib/system/libsystem_secinit.dylib
    0x7fff92f9a000 -     0x7fff92f9aff7  liblaunch.dylib (559.10.3) <DFCDEBDF-8247-3DC7-9879-E7E497DDA4B4> /usr/lib/system/liblaunch.dylib
    0x7fff92f9b000 -     0x7fff92fb1ff7  libsystem_asl.dylib (267) <F153AC5B-0542-356E-88C8-20A62CA704E2> /usr/lib/system/libsystem_asl.dylib
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    0x7fff93fd8000 -     0x7fff93fddff7  libmacho.dylib (862) <126CA2ED-DE91-308F-8881-B9DAEC3C63B6> /usr/lib/system/libmacho.dylib
    0x7fff94003000 -     0x7fff9400bffb  libcopyfile.dylib (118.1.2) <0C68D3A6-ACDD-3EF3-991A-CC82C32AB836> /usr/lib/system/libcopyfile.dylib
    0x7fff94241000 -     0x7fff9443b46f  libobjc.A.dylib (647) <759E155D-BC42-3D4E-869B-6F57D477177C> /usr/lib/libobjc.A.dylib
    0x7fff944ba000 -     0x7fff944c3ff7  libsystem_notify.dylib (133.1.1) <61147800-F320-3DAA-850C-BADF33855F29> /usr/lib/system/libsystem_notify.dylib
    0x7fff944c4000 -     0x7fff944eeff7  libdispatch.dylib (442.1.4) <502CF32B-669B-3709-8862-08188225E4F0> /usr/lib/system/libdispatch.dylib
    0x7fff95c6e000 -     0x7fff95c6fffb  libremovefile.dylib (35) <3485B5F4-6CE8-3C62-8DFD-8736ED6E8531> /usr/lib/system/libremovefile.dylib
    0x7fff95e69000 -     0x7fff95e6bff7  libquarantine.dylib (76) <DC041627-2D92-361C-BABF-A869A5C72293> /usr/lib/system/libquarantine.dylib
    0x7fff96290000 -     0x7fff96475ff3  libicucore.A.dylib (531.31) <B08E00D5-13C6-3391-AB3A-8DE693D3B42E> /usr/lib/libicucore.A.dylib
    0x7fff97443000 -     0x7fff97444ff7  libsystem_blocks.dylib (65) <9615D10A-FCA7-3BE4-AA1A-1B195DACE1A1> /usr/lib/system/libsystem_blocks.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 1
    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: 7502283
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=83.7M resident=73.1M(87%) swapped_out_or_unallocated=10.5M(13%)
Writable regions: Total=323.1M written=239.8M(74%) resident=255.3M(79%) swapped_out=0K(0%) unallocated=67.8M(21%)
 
REGION TYPE                      VIRTUAL
===========                      =======
Kernel Alloc Once                     4K
MALLOC                            314.8M
MALLOC (admin)                       16K
STACK GUARD                        56.0M
Stack                              8192K
VM_ALLOCATE                           8K
__DATA                             1440K
__LINKEDIT                         70.8M
__TEXT                             12.8M
__UNICODE                           544K
shared memory                         4K
===========                      =======
TOTAL                             464.4M

Model: MacBookPro8,2, BootROM MBP81.0047.B27, 4 processors, Intel Core i7, 2.5 GHz, 8 GB, SMC 1.69f4
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 512 MB
Graphics: AMD Radeon HD 6770M, AMD Radeon HD 6770M, PCIe, 1024 MB
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54333531533642465238432D48392020
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1333 MHz, 0x80AD, 0x484D54333531533642465238432D48392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.24)
Bluetooth: Version 4.3.2f6 15235, 3 services, 19 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: Hitachi HTS727575A9E362, 750.16 GB
Serial ATA Device: HL-DT-ST DVDRW  GS31N
USB Device: Hub
USB Device: IR Receiver
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: BRCM2070 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Apple Internal Keyboard / Trackpad
Thunderbolt Bus: MacBook Pro, Apple Inc., 22.1
msg237892 - (view) Author: SilentGhost (SilentGhost) * (Python triager) Date: 2015-03-11 17:31 
This seems to work on linux (returning 0), but fails on 3.4 with "RuntimeError: maximum recursion depth exceeded during compilation". I wonder if the two are related.
msg237893 - (view) Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) * (Python committer) Date: 2015-03-11 17:38 
Probably a stack overflow, when the AST is too deep:
eval("+1" * 748580) also crashed for me
msg237895 - (view) Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) * (Python committer) Date: 2015-03-11 18:06 
So the recursion crash was fixed in python3,
but it's still one of the limits of the Python AST compiler.

I suggest to replace your long expression by a list:
  exprs = [(1-a36)*(a37)*(1-a41), (a22)*(a33)*(1-a23), ...]
  return sum(exprs)

...but this function requires large storage at runtime, on the Python stack, and for the list.
Maybe better:
  loopcount = 0
  loopcount += (1-a36)*(a37)*(1-a41)
  ...
  return loopcount
msg237898 - (view) Author: Michael Klein (Michael Klein) Date: 2015-03-11 18:26 
I found a simpler one, like Amaury's eval("+1" * 748580):

def f(x): 
    y = x+x+x+x+x
    return y
print f(0)

(Except there are 74875 x+'s. This is exactly enough for a segfault, one less runs fine.)

I've tried something like:

 loopcount = 0
  loopcount += (1-a36)*(a37)*(1-a41)
  ...
  return loopcount

It works, but it's still pretty slow. (At least it doesn't crash.) I tried converting to C with Cython, but it's too big to be processed in a reasonable amount of time, but this is irrelevant to the bug.
msg237905 - (view) Author: Ned Deily (ned.deily) * (Python committer) Date: 2015-03-11 21:50 
Isn't this a duplicate of Issue5765 and Issue11383?
msg238056 - (view) Author: Ned Deily (ned.deily) * (Python committer) Date: 2015-03-13 21:38 
(Closed by submitter.)
History
Date User Action Args
2022-04-11 14:58:13adminsetgithub: 67831
2015-03-13 21:38:00ned.deilysetnosy: + ned.deily
messages: + msg238056
resolution: duplicate

superseder: stack overflow evaluating eval("()" * 30000)
stage: resolved
2015-03-13 15:15:44brett.cannonsetnosy: + brett.cannon
2015-03-12 04:54:22Michael Kleinsetstatus: open -> closed
2015-03-11 21:51:03ned.deilysetcomponents: - macOS
2015-03-11 21:50:39ned.deilysetnosy: - ned.deily
2015-03-11 21:50:00ned.deilysetnosy: - ronaldoussoren
messages: + msg237905
2015-03-11 18:26:11Michael Kleinsetmessages: + msg237898
2015-03-11 18:06:05amaury.forgeotdarcsetmessages: + msg237895
2015-03-11 17:38:00amaury.forgeotdarcsetnosy: + amaury.forgeotdarc
messages: + msg237893
2015-03-11 17:31:51SilentGhostsetnosy: + SilentGhost
messages: + msg237892
2015-03-11 17:26:50Michael Kleinsettype: crash
2015-03-11 17:14:04Michael Kleincreate