Bug 4162 - StringBuilder.Append(string) fails
Summary: StringBuilder.Append(string) fails
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: master
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-03-30 14:15 UTC by Dylan Borg
Modified: 2012-03-30 14:24 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Dylan Borg 2012-03-30 14:15:15 UTC
Calling StringBuilder.Append with a string paramater fails in Mono 2.11 as in the below example:

dylan@ubuntu-server:/var/www/Code/dylannet/dncollections$ mono testcoll.exe

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) object.__icall_wrapper_mono_string_alloc (intptr) <0xffffffff>
  at (wrapper alloc) object.Alloc (intptr,int) <0xffffffff>
  at System.Text.StringBuilder.InternalEnsureCapacity (int) <0x0009d>
  at System.Text.StringBuilder.Append (string) <0x00082>
  at dylan.NET.Collections.ALList.ToString () <0x0008f>
  at testcoll.Program.main () <0x000a7>
  at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <0xffffffff>

Native stacktrace:

	mono() [0x80e9034]
	mono() [0x8130bec]
	mono() [0x8060fdd]
	mono() [0x8238a69]
	mono() [0x8238bbd]
	mono() [0x823fa94]
	mono(mono_string_new_size+0x45) [0x81b88f5]
	mono() [0x81b8998]
	/usr/local/lib/mono/4.5/mscorlib.dll.so(+0x28acfe) [0xb3471cfe]
	/usr/local/lib/mono/4.5/mscorlib.dll.so(+0x289d43) [0xb3470d43]
	mono() [0x806562c]

Debug info from gdb:

Could not attach to process.  If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user.  For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
No threads.

Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries 
used by your application.

Aborted (core dumped)
Comment 1 Dylan Borg 2012-03-30 14:24:51 UTC
I had something wrong in the code that caused an unnecessarily large space allocation for the string.