> I tried a similar test case like yours and it works ok. Unfortunately my
> program is extremely large and complicated. In fact I get other errors
> like "conditional jump depends on uninitialized value" but these errors
> exist in another part of the code entirely.
If the other errors include any illegal write to memory (outside the
bounds of an allocated block) then such an error could scramble the data
on which malloc depends.
Now it is time to try strace:
strace -e trace=mmap,mmap2,munmap,brk,mremap valgrind \
valgrind_args... ./my_app app_args...
which gives an independent report of all the system calls which perform
address-space manipulation, and includes the decoded system errno.
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