Bug report: segfault when function and alias names collide

[Ben Hoskings <ben@xxxxxxxxxxxx>]

Hi all,

Just accidentally defined a function with the same name as an alias, which
caused a segfault. (I was replacing the alias with a function, and loading
the new function with '. ~/.zshrc', which caused both to be defined at
once.)

alias gls='glog -S'
gls() {
  query="$1"
  shift
  glog --pickaxe-regex "-S$query" "$@"
}

This command segfaulted zsh:

$ gls content_for

The crash report is below.

I'm running zsh 4.3.10 (i386-apple-darwin10.3.0), built via homebrew on OS X
10.6.4.

Hope that's useful.

Cheers
Ben Hoskings

---

Process:         zsh [53012]
Path:            /usr/local/Cellar/zsh/4.3.10/bin/zsh
Identifier:      zsh
Version:         ??? (???)
Code Type:       X86-64 (Native)
Parent Process:  ??? [53011]

Date/Time:       2010-07-13 10:13:17.281 +1000
OS Version:      Mac OS X 10.6.4 (10F569)
Report Version:  6

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00007fff5f3fdca0
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   zsh                            0x0000000100014fa4 findcmd + 1124
1   zsh                            0x00000001000194f5 findcmd + 18869
2   zsh                            0x00000001000198ec findcmd + 19884
3   zsh                            0x000000010001a9a7 execlist + 1863
4   zsh                            0x000000010001b0d7 runshfunc + 231
5   zsh                            0x000000010001b595 doshfunc + 1157
6   zsh                            0x000000010001b872 doshfunc + 1890
7   zsh                            0x0000000100017ee8 findcmd + 13224
[ snip ]
498 zsh                            0x00000001000194f5 findcmd + 18869
499 zsh                            0x00000001000198ec findcmd + 19884
500 zsh                            0x000000010001a9a7 execlist + 1863
501 zsh                            0x000000010001b0d7 runshfunc + 231
502 zsh                            0x000000010001b595 doshfunc + 1157
503 zsh                            0x000000010001b872 doshfunc + 1890
504 zsh                            0x0000000100017ee8 findcmd + 13224
505 zsh                            0x00000001000194f5 findcmd + 18869
506 zsh                            0x00000001000198ec findcmd + 19884
507 zsh                            0x000000010001a9a7 execlist + 1863
508 zsh                            0x000000010001b0d7 runshfunc + 231
509 zsh                            0x000000010001b595 doshfunc + 1157
510 zsh                            0x000000010001b872 doshfunc + 1890
511 zsh                            0x0000000100017ee8 findcmd + 13224

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x00000001000a15e0  rbx: 0x0000000000000000  rcx: 0x0000000000000002
 rdx: 0x0000000000000000
  rdi: 0x00007fff5f401110  rsi: 0x0000000000000000  rbp: 0x00007fff5f400f40
 rsp: 0x00007fff5f3fdbf0
   r8: 0x0000000000000002   r9: 0x0000000000000000  r10: 0x0000000000000000
 r11: 0x0000000000000000
  r12: 0x00007fff5f401110  r13: 0x0000000000000002  r14: 0x0000000000000002
 r15: 0x0000000000000000
  rip: 0x0000000100014fa4  rfl: 0x0000000000010206  cr2: 0x00007fff5f3fdca0

Binary Images:
       0x100000000 -        0x100096ff7 +zsh ??? (???)
<FB91D33A-8970-3D19-A99D-206E3E79F866> /usr/local/bin/zsh
       0x1000b0000 -        0x1000b4fff +libgdbm.3.dylib 4.0.0
(compatibility 4.0.0) <A74D1801-78FB-58F6-82ED-52060F84B8C0>
/usr/local/Cellar/gdbm/1.8.3/lib/libgdbm.3.dylib
       0x1000f3000 -        0x1000f7ff7 +zutil.so ??? (???)
<A12BD67B-1216-1B02-6011-05E64E564BDC>
/usr/local/Cellar/zsh/4.3.10/lib/zsh/zutil.so
       0x100300000 -        0x100330fff +zle.so ??? (???)
<114EFB0E-BA18-AC14-6C44-07EE2B651A27>
/usr/local/Cellar/zsh/4.3.10/lib/zsh/zle.so
       0x100345000 -        0x100361ff7 +complete.so ??? (???)
<BD62A4B7-E05A-5B56-FFF3-2338CE0A708D>
/usr/local/Cellar/zsh/4.3.10/lib/zsh/complete.so
       0x10036a000 -        0x100370ff7 +parameter.so ??? (???)
<FE276977-5B8B-00A3-29D0-BB89F02B8FF6>
/usr/local/Cellar/zsh/4.3.10/lib/zsh/parameter.so
       0x100398000 -        0x1003a4ff7 +computil.so ??? (???)
<1D159FAC-DC8D-07B1-CDCF-92EDB887F10B>
/usr/local/Cellar/zsh/4.3.10/lib/zsh/computil.so
    0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???)
<B536F2F1-9DF1-3B6C-1C2C-9075EA219A06> /usr/lib/dyld
    0x7fff841ce000 -     0x7fff842c6ff7  libiconv.2.dylib 7.0.0
(compatibility 7.0.0) <7E4ADB5A-CC77-DCFD-3E54-2F35A2C8D95A>
/usr/lib/libiconv.2.dylib
    0x7fff85e84000 -     0x7fff85e88ff7  libmathCommon.A.dylib 315.0.0
(compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5>
/usr/lib/system/libmathCommon.A.dylib
    0x7fff88a05000 -     0x7fff88bc5fef  libSystem.B.dylib 125.2.0
(compatibility 1.0.0) <95E02DD0-ADEA-745B-E7FA-ABA064E4658C>
/usr/lib/libSystem.B.dylib
    0x7fff88efa000 -     0x7fff88f39fef  libncurses.5.4.dylib 5.4.0
(compatibility 5.4.0) <E1F34D53-3D62-78C0-CAD8-8AD22C110A9E>
/usr/lib/libncurses.5.4.dylib
    0x7fffffe00000 -     0x7fffffe01fff  libSystem.B.dylib ??? (???)
<95E02DD0-ADEA-745B-E7FA-ABA064E4658C> /usr/lib/libSystem.B.dylib