[Bug libc/21357] New: unwind-dw2-fde deadlock when using AddressSanitizer

["rabinv at axis dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21357

            Bug ID: 21357
           Summary: unwind-dw2-fde deadlock when using AddressSanitizer
           Product: glibc
           Version: 2.26
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: rabinv at axis dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

__deregister_frame_info_bases() calls free() while holding a mutex which is
also used from _Unwind_Find_FDE().  This leads to a deadlock if
AddressSanitizer uses _Unwind_Backtrace() from its free() implementation.  Seen
on MIPS.

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