https://llvm.org/bugs/show_bug.cgi?id=28757
Bug ID: 28757
Summary: Preserveall Calling convention breaks libunwind stack
walking
Product: new-bugs
Version: 3.9
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: alk...@microsoft.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The mono project has found that when the calling convention is set to
preserveall on linux, the stack is corrupted in such a way that new frames
appear in a stacktrace. These frames have ip addresses which are usually not in
any mapped memory range. This causes libgcc's exception handling unwinder to
abort stack walking upon hitting the garbage frame.
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