[Bug malloc/22830] New: malloc_stats doesn't restore cancellation state on stderr

[zackw at panix dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22830

            Bug ID: 22830
           Summary: malloc_stats doesn't restore cancellation state on
                    stderr
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: zackw at panix dot com
  Target Milestone: ---

Created attachment 10803
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10803&action=edit
test program

malloc_stats intends to disable cancellation on stderr while it's writing to
it, and then re-enable it again afterward, but due to a one-character typo,
what it actually does is disable cancellation on stderr permanently.

The attached test program (needs -(l)pthread) demonstrates the problem:

$ ./a.out; echo $?
FAIL: thread was not cancelled
FAIL: fputs produced output
--- output from thread below ---
Arena 0:
system bytes     =     135168
in use bytes     =       3488
Arena 1:
system bytes     =     135168
in use bytes     =      11632
Total (incl. mmap):
system bytes     =     270336
in use bytes     =      15120
max mmap regions =          0
max mmap bytes   =          0
should be cancelled at this point
1

Expected behavior is no output, successful exit.

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