01431c2f61
The main motivation for this change is to handle very large stack traces, normally the result of infinite recursion. This part is actually fairly simple, relaxing a few self-imposed limits on how many frames we can unwind and the max size for stack memory. Relaxing these limits requires stricter and more consistent checks for stack unwinding. There are a number of unwinding invariants that apply to all the platforms: 1. stack pointer (and frame pointer) must be within the stack memory (frame pointer, if preset, must point to the right frame too) 2. unwinding must monotonically increase SP (except for the first frame unwind, this must be a strict increase) 3. Instruction pointer (return address) must point to a valid location 4. stack pointer (and frame pointer) must be appropriately aligned This change is focused on 2), which is enough to guarantee that the unwinding doesn't get stuck in an infinite loop. 1) is implicitly validated part of accessing the stack memory (explicit checks might be nice though). 4) is ABI specific and while it may be valuable in catching suspicious frames is not in the scope of this change. 3) is also an interesting check but thanks to just-in-time compilation it's more complex than just calling StackWalker::InstructionAddressSeemsValid() and we don't want to drop parts of the callstack due to an overly conservative check. Bug: chromium:735989 Change-Id: I9aaba77c7fd028942d77c87d51b5e6f94e136ddd Reviewed-on: https://chromium-review.googlesource.com/563771 Reviewed-by: Mark Mentovai <mark@chromium.org> Reviewed-by: Ivan Penkov <ivanpe@chromium.org>
Breakpad
Breakpad is a set of client and server components which implement a crash-reporting system.
- Homepage
- Documentation
- Bugs
- Discussion/Questions: google-breakpad-discuss@googlegroups.com
- Developer/Reviews: google-breakpad-dev@googlegroups.com
- Tests:
- Coverage
Getting started (from master)
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First, download depot_tools and ensure that they’re in your
PATH. -
Create a new directory for checking out the source code (it must be named breakpad).
mkdir breakpad && cd breakpad -
Run the
fetchtool from depot_tools to download all the source repos.fetch breakpad cd src -
Build the source.
./configure && makeYou can also cd to another directory and run configure from there to build outside the source tree.
This will build the processor tools (
src/processor/minidump_stackwalk,src/processor/minidump_dump, etc), and when building on Linux it will also build the client libraries and some tools (src/tools/linux/dump_syms/dump_syms,src/tools/linux/md2core/minidump-2-core, etc). -
Optionally, run tests.
make check -
Optionally, install the built libraries
make install
If you need to reconfigure your build be sure to run make distclean first.
To update an existing checkout to a newer revision, you can
git pull as usual, but then you should run gclient sync to ensure that the
dependent repos are up-to-date.
To request change review
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Follow the steps above to get the source and build it.
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Make changes. Build and test your changes. For core code like processor use methods above. For linux/mac/windows, there are test targets in each project file.
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Commit your changes to your local repo and upload them to the server. http://dev.chromium.org/developers/contributing-code e.g.
git commit ... && git cl upload ...You will be prompted for credential and a description. -
At https://chromium-review.googlesource.com/ you'll find your issue listed; click on it, then “Add reviewer”, and enter in the code reviewer. Depending on your settings, you may not see an email, but the reviewer has been notified with google-breakpad-dev@googlegroups.com always CC’d.