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Date: | Thu, 15 Jan 2015 21:17:48 +0100 |
From: | Marco Atzeri <marco DOT atzeri AT gmail DOT com> |
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To: | Alexander DOT Kleinsorge AT gmx DOT de, "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com> |
Subject: | Re: tracing malloc/free call |
References: | <trinity-2b354d37-64f8-425c-b700-f3d872c5d0fb-1421351998667 AT 3capp-gmx-bs27> |
In-Reply-To: | <trinity-2b354d37-64f8-425c-b700-f3d872c5d0fb-1421351998667@3capp-gmx-bs27> |
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On 1/15/2015 8:59 PM, Alexander DOT Kleinsorge AT gmx DOT de wrote: > Hi Marco, > freeing an address that is not alligned to typically 4 or 8 bytes is > never possible, > because malloc would never return such. > Your pointer ends with 0x..1 so it cannot be alligned on any architecture. > regards, > Alexander I know. The application is crashing. It is clearly a free call with a corrupted pointer, but not knowing the caller address make difficult to identify what is corrupting the pointer. > Your Post: > > Debugging a program I am trying to catch where this call is happening > > 17 1499678 [main] ncview 1484 free: (0x6000D7961), called by 0x180115A0B > > unfortunately the 0x180115A0B address is not real caller address > > /usr/src/debug/cygwin-1.7.33-1/winsup/cygwin/malloc_wrapper.cc > > extern "C" void > free (void *p) > { > malloc_printf ("(%p), called by %p", p, __builtin_return_address (0)); > if (!use_internal) > user_data->free (p); > else > { > __malloc_lock (); > dlfree (p); > __malloc_unlock (); > } > } > > > Any way to improve the tracing ? > $ uname -svr > CYGWIN_NT-6.1 1.7.33-2(0.280/5/3) 2014-11-13 15:47 > > Regards > Marco > -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
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