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digitalmars.D.bugs - [Issue 6047] New: Segfault when struct with three or more ulongs with a toString is passed to format with at least two substitution clauses.

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6047

           Summary: Segfault when struct with three or more ulongs with a
                    toString is passed to format with at least two
                    substitution clauses.
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: blood.of.life gmail.com


--- Comment #0 from Bernard Helyer <blood.of.life gmail.com> 2011-05-23
05:01:35 PDT ---
import std.string;

struct A { ulong a, b, c; string toString() { return ""; } }

void main()
{
    A a;
    format("%s%s", a, "");
}



There has to be at least 24 bytes (or so) of declarations, so at least three
ulongs. The toString has to be there. That second parameter to format has to be
there.

Somewhere, there is stack corruption happening. This is preventing SDC's 64 bit
build from working correctly (it crashes when it errors, as the Location struct
is passed to format, manifesting this when its size_t decls are 64 bits wide).

This could be from DMD or Phobos. I'm not sure.

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--- Comment #1 from Bernard Helyer <blood.of.life gmail.com> 2011-05-23
05:05:16 PDT ---
I didn't mention my specs. Linux (64 or 32 bit build and output), 2.053 (but
it's been there for months, _at least_, to my knowledge), Phenom II X4, Arch
Linux.

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--- Comment #2 from kennytm gmail.com 2011-05-23 05:57:50 PDT ---
(No-repro on Mac OS X.)

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--- Comment #3 from Bernard Helyer <blood.of.life gmail.com> 2011-05-23
06:31:32 PDT ---
I was mistaken -- it's only when building a 64 bit binary.

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Nick Sabalausky <cbkbbejeap mailinator.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |critical


--- Comment #4 from Nick Sabalausky <cbkbbejeap mailinator.com> 2011-11-19
20:59:15 PST ---
Raising priority because this is a rather nasty bug to come up against.

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--- Comment #5 from Nick Sabalausky <cbkbbejeap mailinator.com> 2011-11-21
07:44:59 PST ---
The format string can be blank and this bug will still be triggered. So a
slight reduction is:

import std.string;

struct A { ulong a, b, c; string toString() { return ""; } }

void main()
{
    A a;
    format("", a, "");
}

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--- Comment #6 from Nick Sabalausky <cbkbbejeap mailinator.com> 2011-11-21
07:59:44 PST ---
Issue 6576 may be related to this.

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--- Comment #7 from Nick Sabalausky <cbkbbejeap mailinator.com> 2011-11-21
08:46:34 PST ---
I think the root cause of this might be issue 6983.

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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |WORKSFORME


--- Comment #8 from Walter Bright <bugzilla digitalmars.com> 2012-04-28
01:42:08 PDT ---
I tried this for -m32 and -m64 on Linux, and the program completes without
error on dmd 2.060 latest build.

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