Crash your app in style (Golang)

Overview

panicparse

Parses panic stack traces, densifies and deduplicates goroutines with similar stack traces. Helps debugging crashes and deadlocks in heavily parallelized process.

PkgGoDev Go Report Card Coverage Status

panicparse helps make sense of Go crash dumps:

Screencast

Features

See v2.0.1 blog post.

  • New in v2.0.0!: Full go module support.
  • New in v2.0.0!: Race detector support.
  • New in v2.0.0!: HTML export.
  • New in v2.0.0!: Completely refactored stack package for higher performance.
  • New in v1.4.0!: webstack.SnapshotHandler is a http handler that serves a very tight and swell snapshot of your goroutines, much more readable than net/http/pprof.
  • >50% more compact output than original stack dump yet more readable.
  • Deduplicates redundant goroutine stacks. Useful for large server crashes.
  • Arguments as pointer IDs instead of raw pointer values.
  • Pushes stdlib-only stacks at the bottom to help focus on important code.
  • Parses the source files if available to augment the output.
  • Works on Windows.

webstack in action

Screencast

Authors

panicparse was created with ❤️ ️ and passion by Marc-Antoine Ruel and friends.

Installation

go get github.com/maruel/panicparse/v2/cmd/pp

Usage

Piping a stack trace from another process

TL;DR

  • Ubuntu (bash v4 or zsh): |&
  • macOS, install bash 4+, then: |&
  • Windows or macOS with stock bash v3: 2>&1 |
  • Fish shell: ^|

Longer version

pp streams its stdin to stdout as long as it doesn't detect any panic. panic() and Go's native deadlock detector print to stderr via the native print() function.

Bash v4 or zsh: |& tells the shell to redirect stderr to stdout, it's an alias for 2>&1 | (bash v4, zsh):

go test -v |&pp

Windows or macOS native bash (which is 3.2.57): They don't have this shortcut, so use the long form:

go test -v 2>&1 | pp

Fish: It uses ^ for stderr redirection so the shortcut is ^|:

go test -v ^|pp

PowerShell: It has broken 2>&1 redirection. The workaround is to shell out to cmd.exe. :(

Investigate deadlock

On POSIX, use Ctrl-\ to send SIGQUIT to your process, pp will ignore the signal and will parse the stack trace.

Parsing from a file

To dump to a file then parse, pass the file path of a stack trace

go test 2> stack.txt
pp stack.txt

Tips

Disable inlining

Starting with go1.11, the toolchain starts to inline more often. This causes traces to be less informative. You can use the following to help diagnosing issues:

go install -gcflags '-l' path/to/foo
foo |& pp

or

go test -gcflags '-l' ./... |& pp

GOTRACEBACK

Starting with Go 1.6, GOTRACEBACK defaults to single instead of all / 1 that was used in 1.5 and before. To get all goroutines trace and not just the crashing one, set the environment variable:

export GOTRACEBACK=all

or set GOTRACEBACK=all on Windows. Probably worth to put it in your .bashrc.

Updating bash on macOS

Install bash v4+ on macOS via homebrew or macports. Your future self will appreciate having done that.

If you have /usr/bin/pp installed

If you try pp for the first time and you get:

Creating tables and indexes...
Done.

and/or

/usr/bin/pp5.18: No input files specified

you may be running the Perl PAR Packager instead of panicparse.

You have two choices, either you put $GOPATH/bin at the beginning of $PATH or use long name panicparse with:

go get github.com/maruel/panicparse/v2

then using panicparse instead of pp:

go test 2> panicparse
Comments
  • allow matching and filtering traces

    allow matching and filtering traces

    This PR adds 2 new flags:

    -f `regexp`, hides trace headers that matches the regexp.
    -m `regexp`, shows only the trace headers that matches the regexp.
    

    Example:

    ➤ go run main.go -m 'PutTask|RemoveTask' ../../xxx/xxx/crash.log
    1: semacquire [26 minutes] [Created by reportQueue.PutTask @ q.go:104]
        sync          sema.go:297                 runtime_notifyListWait(#343, #735)
        sync          cond.go:57                  (*Cond).Wait(#342)
        io            pipe.go:47                  (*pipe).read(#341, #348, 0x8000, 0x8000, 0, 0, 0)
        io            pipe.go:130                 (*PipeReader).Read(#588, #348, 0x8000, 0x8000, 0x8000, 0x8000, #13)
        io            io.go:390                   copyBuffer(#1482, #1125, #7, #588, #348, 0x8000, 0x8000, #1482, 0x4a80ac, 0x25)
        io            io.go:360                   Copy(#1482, #1125, #7, #588, 0xbdc020, 0, #1482)
        iodb          bucket.go:206               (*bucket).PutTimed.func1(#1482, #1125, #1125, #1482)
        iodb          bucket.go:167               (*bucket).PutTimedFunc(#62, #298, 0x20, #1124, #1383, 0, 0, 0, 0, 0)
        iodb          bucket.go:207               (*bucket).PutTimed(#62, #298, 0x20, #7, #588, #1383, 0, 0, 0, 0xa15711, ...)
        reportQueue   q.go:99                     PutTask.func1(#437, #1383, #395, 0x4, #1193, #303, #44)
    
    
    opened by OneOfOne 14
  • Support parsing Go 1.17 stack traces

    Support parsing Go 1.17 stack traces

    Fixes #61.

    In Go 1.17, the format of function arguments printed in stack traces was improved. This is mentioned in the release notes: https://tip.golang.org/doc/go1.17#compiler

    The format of stack traces from the runtime (printed when an uncaught panic occurs, or when runtime.Stack is called) is improved. Previously, the function arguments were printed as hexadecimal words based on the memory layout. Now each argument in the source code is printed separately, separated by commas. Aggregate-typed (struct, array, string, slice, interface, and complex) arguments are delimited by curly braces. A caveat is that the value of an argument that only lives in a register and is not stored to memory may be inaccurate. Function return values (which were usually inaccurate) are no longer printed.

    This runtime change was primarily performed in https://go-review.googlesource.com/c/go/+/304470. The description on that CL presents the change in greater detail.

    This commit adds support to panicparse for parsing these new aggregate-typed arguments. It does so while retaining the type structure from the stack traces, which allows for the structure to be faithfully recreated and for aggregate-type information to be accurately augmented, when available. The aggregate-type structure is stored in a tree of mutually recursive Args and Arg structs.

    The commit also adds support for handling the new "offset too large" operator that was added in the same runtime CL. This operator comes in the form of an "_" scalar argument in cases where the argument's frame offset was too large (>= 0xf0), preventing the argument from being printed in the stack trace.

    This change raises questions about backwards compatability in a few different areas.

    • this change does not break backwards compatability with pre-1.17 stack traces. However, due to the nature of how most of the unit tests are set up (i.e. shelling out to local go binary), we are losing some test coverage of pre-1.17 stack trace parsing. Is that ok?
    • similarly, this change breaks the library's tests for pre-1.17 installations of Go. As a result, it bumps the Go version run in CI. Is that ok?
    • this change will not cause users of the github.com/maruel/panicparse/v2/stack library to fail to compile. However, due to the additions to the Arg struct, users of the library will fail to observe all arguments when parsing post-1.17 stack traces (but not pre-1.17 stack traces) unless they are aware of the new IsAggregate field. Is that ok?
    opened by nvanbenschoten 13
  • Opening

    Opening "internal" to the world; export writer as an API

    Hey, i'm building some golang app supervising software and found your stacktracing project interesting. Is it possible to get rid of "internal" package (e.g. rename it to "reallyinternal") so I'll be able to import it and use its functions?

    opened by rshmelev 13
  • panicparse fails on processing the new stack trace format in go1.17

    panicparse fails on processing the new stack trace format in go1.17

    Repro:

    (Used to point to go1.17beta1, go1.17rc1, updated to go1.17)

    go get golang.org/dl/go1.17
    go1.17 download
    go1.17 test ./stack
    

    TestAugment, TestPanic and TestPanicWeb fail.

    Manual compile:

    git clone https://go.googlesource.com/go golang
    cd golang/src
    ./make.bash
    export PATH=$(pwd)/../bin:$PATH
    cd /path/to/panicparse
    go test ./stack
    
    opened by maruel 9
  • Output modification fails on a Gin application

    Output modification fails on a Gin application

    I tried to set this up with my company's Gin application and it...just sort of failed. All debug output is gone and the only message resulting from panic output is a bufio.Scanner: token too long error. For context, here's (a shortened by ~15 frames and obfuscated version of) what normally goes to the console:

    goroutine 55 [running]:
    main.recovery(0xc8201f6310)
        /appdir/middleware.go:40 +0x165
    main.(*DB).Update(0xc8202d1860, 0x78e0c0, 0xc82006cd00, 0xc820369440, 0xc8201e5680)
        /appdir/db.go:150 +0x1a19
    main.UpdateAccountHandler(0xc8201d4430)
        /appdir/account_handlers.go:134 +0x326
    main.InjectContext.func1(0xc8201664d0)
        /appdir/context.go:52 +0x61
    created by net/http.(*Server).Serve
        /appdir/server.go:1910 +0x3f6
      type=stack-trace
    

    Admittedly we've got our own output systems in place instead of just a standard panic call, but the output format doesn't seem different enough to cause a major issue...thoughts?

    opened by moberemk 9
  • panicparse ignores control-C

    panicparse ignores control-C

    This was puzzling to me when trying it out - if you don't supply a filename it just hangs and can't be interrupted. The behaviour was added in a0eb0cee87d7cad0b22421baf899a09380d36fce, but I don't follow the explanation. I can understand ignoring Ctrl-\, which was added later.

    opened by bboreham 8
  • basic filter implementation

    basic filter implementation

    this addresses a common need for me. I often want to restrict output to a certain package or set of files because i know that's where the stuff is happening that I'm looking for.

    here's some ideas to make this feature more advanced:

    • both conditions are currently OR'ed. may want to change to AND, or leave it up to user. we may also want to support multiple conditions. something like the below perhaps: -filter "path=foo && (package == bar || package == baz)"
    • instead of substring/equality, may want to support regex, especially for path

    ... I haven't personally had this need though, so I would keep it simple until it's clear we want to support such fancier things.

    opened by Dieterbe 8
  • stack: use a teereader to avoid outputting with bad newlines

    stack: use a teereader to avoid outputting with bad newlines

    Right now the output looks a bit like this running it through my test suite:

    make ...
                           some other command
                                            another command
    

    This fixes that by using an io.TeeReader. It does however leave the panic on the screen before parsing it, I think this is kind of a feature depending on how you look at it. The output otherwise is unaffected (save the newlines).

    opened by erikh 8
  • More aggressive deduplication

    More aggressive deduplication

    Hi, thanks for the great tool!

    I took a large (20k lines) goroutine dump from a server and I used panicparse to analyze it. Unfortunately panicparse still emits many thousands of lines because lots of goroutines that are the same for my purposes cannot be deduplicated.

    I dug into it more and I found two specific issues:

    1. Panicparse compares argument values and if it doesn't think they're pointers, it wants the values to be the same. For my purposes, I really don't care about function args; I want two goroutines to be deduped if they have the same stack trace.

      In case it helps, here are two lines from two different goroutines that caused them to not be deduped (this is deep in net's inner workings, far away from my own code):

      io.copyBuffer(0x7fa5add90238, 0xc820106aa0, 0x7fa5addd01d8, 0xc820106a60, 0xc820166000, 0x8000, 0x8000, 0x38bd, 0x0, 0x0)
      io.copyBuffer(0x7fa5add90238, 0xc820028220, 0x7fa5addd01d8, 0xc820152148, 0xc820a80000, 0x8000, 0x8000, 0x98d, 0x0, 0x0)
      

      My quick hack was to modify my local copy of stack.go to consider two Args to be similar if they have the same number of args (without looking at the args):

      func (a *Args) Similar(r *Args) bool {
        return a.Elided == r.Elided && len(a.Values) == len(r.Values)
      }
      
    2. If a goroutine has been blocked for a long time on e..g a channel op or IO, it prints something like

      goroutine 134103 [chan send, 609 minutes]:
      

      or

      goroutine 134227 [IO wait, 747 minutes]:
      

      A difference in # of minutes causes two goroutines not to be deduped. My quick hack here was to modify my trace file with a quick s/\d+ minutes/123 minutes/. A more robust solution would be for panicparse to merge multiple values by replacing with * minutes (as with merged function params) or, if we want to be fancy, something like (12-49) minutes.

    I wanted to bring these issues to your attention and see what you think a good solution might be. I'm not sure if, for other people in other contexts, having goroutines not be disambiguated for the above two reasons is useful. If so, perhaps there could be a flag for even more aggressive deduplication.

    opened by cespare 8
  • TestAugment fails on all architectures other than amd64

    TestAugment fails on all architectures other than amd64

    All tests TestAugment passes on the amd64 architecture, but some of the tests would fail on all other architectures.

    For example, with the recent Debian builds of panicparse 2.2.2-1:

    | Test | Architectures on which the test failed | | ---------- | ---------- | | TestAugment/0-local_function_doesn't_interfere | arm64, armel, armhf, ppc64el, riscv64 | | TestAugment/1-func | armel, armhf | | TestAugment/12-string | arm64, armel, armhf, ppc64el, riscv64 | | TestAugment/13-string_and_int | arm64, armel, armhf, ppc64el, riscv64 | | TestAugment/16-error_unnamed | arm64, armel, armhf, i386, mips64el, mipsel, ppc64el, riscv64, s390x | | TestAugment/24-argument_offsets_partially_too_large | armel, armhf, i386, mipsel | | TestAugment/25-argument_offsets_entirely_too_large | armel, armhf, i386, mipsel |

    IIRC, the mapping from Debian architecture names to GOARCH are as follows:

    • armel and armhf ⇒ GOARCH=arm
    • i386 ⇒ GOARCH=386
    • mips64el ⇒ GOARCH=mips64le
    • mipsel ⇒ GOARCH=mipsle
    • ppc64el ⇒ GOARCH=ppc64le

    Screen capture of overview of Debian build status for panicparse (https://buildd.debian.org/status/package.php?p=panicparse):

    image

    Thanks!

    opened by anthonyfok 7
  • Fuzzing integration

    Fuzzing integration

    Hello,

    Interesting package. I think it's suitable for fuzzing. Proposing to get it running on Fuzzit. They give free service for open source.

    They use go-fuzz. It's one of these genetic fuzzers, it instruments the binary and tries to traverse all the branches. A local run has built up a corpus of a couple hundred cases. No crashes so far. It seems to be in good shape.

    Build will fail due to missing the API key. If you're interested setup is like this:

    • In Fuzzit create the target panicparse.
    • In Fuzzit settings grab an API key. In repo settings in Travis paste it to envvar FUZZIT_API_KEY.
    opened by bookmoons 7
  • Empty structs aren't decoded correctly in function arguments.

    Empty structs aren't decoded correctly in function arguments.

    This is a pretty minor thing, but it confused me enough to make me want to fix it, unless its a harder problem than I'm realizing.

    Empty structs are decoded as ..., `` or sometimes as unknown.

    I'd be happy to take a stab at this tonight if this is indeed a bug.

    Examples:

    //go:noinline
    func Foo(x struct{}) {
    	panic("test")
    }
    
    func TestFoo(t *testing.T) {
    	Foo(struct{}{})
    }
    

    Results in:

    1: running [Created by testing.(*T).Run @ testing.go:1238]
        testing testing.go:1143    tRunner.func1.2(*T(#1), func(#2))
        testing testing.go:1146    tRunner.func1(*T(#3))
                panic.go:965       panic(interface{}(#1))
        pp ppl_test.go:16 Foo()
        pp pp_test.go:20 TestFoo(*T(#3))
        testing testing.go:1193    tRunner(*T(#3), func(0x8952b8))
    exit status 2
    

    And

    //go:noinline
    func Foo(x chan struct{}) {
    	panic("test")
    }
    
    func TestFoo(t *testing.T) {
    	Foo(nil)
    }
    

    Results in:

    1: running [Created by testing.(*T).Run @ testing.go:1238]
        testing testing.go:1143    tRunner.func1.2(*T(#1), func(#2))
        testing testing.go:1146    tRunner.func1(*T(#3))
                panic.go:965       panic(interface{}(#1))
        pp ppl_test.go:16 Foo(chan <unknown>(0x0))
        pp pp_test.go:20 TestFoo(*T(#3))
        testing testing.go:1193    tRunner(*T(#3), func(0x8952b8))
    exit status 2
    
    opened by dallbee 2
  • [feature]

    [feature] "vim/compiler-like format" [-format=vim? =quickfix?]

    It would be cool if the tool supported an output format similar to "typical compilers", so that it could be easily fetched into vim's "quickfix" window, for easy jumping through the lines shown in the trace. For example:

    1: running...
    /foo/bar/baz/tool.go:123: (*whatever) FlavorText()
    /foo/bar/baz/tool.go:55: (*whatever) Something()
    /foo/bar/baz/main.go:22: CREATED BY: main()
    5: ...
      ...
    7: ...
      ...
    

    When imported to vim with :cex system('panicparse -format=vim -only < foobar.log') | copen, this should make it trivial to jump between tool.go l.123, main.go l.22, etc., using :cn and :cp commands. (With properly configured :set errorformat=... in vim, the lines like 1: running... would still get displayed in the quickfix window, clearly separating the goroutines.)

    edit: the Go oracle tool has it as: -format=plain

    opened by akavel 2
Releases(v2.3.1)
  • v2.3.1(Aug 29, 2022)

    Full Changelog: https://github.com/maruel/panicparse/compare/v2.3.0...v2.3.1

    Various changes to make it compatible with go1.19.

    The only functional change is to add a timeout to panicweb to prevent a DoS.

    Source code(tar.gz)
    Source code(zip)
  • v2.3.0(Jun 21, 2022)

    • Rewrote the github actions. Enforce much more strict lints, including gosec.
    • Bumped minimal support to go1.13 and removed support code for older code.
    • Skip change detector test cases that were broken on 386, arm, arm64, mipsle, mips64le, ppc64le, riscv64 and s390x. Thanks @anthonyfok!

    Full Changelog: https://github.com/maruel/panicparse/compare/v2.2.2...v2.3.0

    Source code(tar.gz)
    Source code(zip)
  • v2.2.2(May 13, 2022)

    What's Changed

    • Avoid unicode filename by @tbg in https://github.com/maruel/panicparse/pull/78

    New Contributors

    • @tbg made their first contribution in https://github.com/maruel/panicparse/pull/78

    Full Changelog: https://github.com/maruel/panicparse/compare/v2.2.1...v2.2.2

    Source code(tar.gz)
    Source code(zip)
  • v2.2.1(Apr 9, 2022)

    What's Changed

    • README.md: add hint for sh aliasing (pp naming conflict) by @jtagcat in https://github.com/maruel/panicparse/pull/72
    • stack: add support for 1.17 stack traces by @MordFustang21 in https://github.com/maruel/panicparse/pull/74

    New Contributors

    • @jtagcat made their first contribution in https://github.com/maruel/panicparse/pull/72
    • @MordFustang21 made their first contribution in https://github.com/maruel/panicparse/pull/74

    Full Changelog: https://github.com/maruel/panicparse/compare/v2.2.0...v2.2.1

    Source code(tar.gz)
    Source code(zip)
  • v2.2.0(Oct 19, 2021)

    Stack traces from go1.17 runtime are now supported!

    What's Changed

    • Correct fish shell usage documentation by @dallbee in https://github.com/maruel/panicparse/pull/58
    • Add //go:build lines by @nvanbenschoten in https://github.com/maruel/panicparse/pull/64
    • Fix misuse of unbuffered os.Signal channel as argument to signal.Notify by @nvanbenschoten in https://github.com/maruel/panicparse/pull/63

    New Contributors

    • @dallbee made their first contribution in https://github.com/maruel/panicparse/pull/58
    • @nvanbenschoten made their first contribution in https://github.com/maruel/panicparse/pull/64

    Full Changelog: https://github.com/maruel/panicparse/compare/v2.1.1...v2.2.0

    Source code(tar.gz)
    Source code(zip)
  • v1.6.0(Dec 19, 2020)

  • v1.5.1(Aug 24, 2020)

    If you are reading this, you have three choices:

    • Upgrade to v2. Seriously, do this. It's so much better!
    • Disable the nudge with the environment variable PANICPARSE_V1_NO_WARN=1
    • Stick to v1.5.0.
    Source code(tar.gz)
    Source code(zip)
  • v2.0.1(Aug 10, 2020)

  • v2.0.0-alpha1(May 31, 2020)

    • Enabled race detector parsing!
    • Significantly accelerated performance for pass through.
    • Significant refactoring of the package stack.
    • Removed vendor/ since it's not used anymore by current Go versions. As such, the minimum required version is now 1.9.x.
    • Includes recent v1.5.0 go module support.
    Source code(tar.gz)
    Source code(zip)
  • v1.5.0(May 29, 2020)

    Lots of nice things before v2:

    • Add support for local go module outside of GOPATH. It only works well if "remote" and "local" paths match.
    • Fix panicweb on macOS.
    • Wrap errors where applicable on go 1.13 and later.
    • Ran staticcheck and fixed all warnings.
    • Fixed tests on 32 bits when -race is not supported.
    • Many internal refactoring in preparation for v2.
    Source code(tar.gz)
    Source code(zip)
  • v1.4.1(Apr 18, 2020)

    Most of the changes are test-only changes to help in preparation for v2.

    The only user visible changes are IsPtr floor was lowered from 8MiB to 4MiB and processing is now a bit faster and more memory efficient.

    Source code(tar.gz)
    Source code(zip)
  • v1.4.0(Apr 6, 2020)

  • v1.3.0(Jul 19, 2019)

    • Add support for stack trace generated by Go 1.13beta1.
    • cmd/panic includes more ways to panic, including very deep stacks.
    • Add support for indented output.
    • (Currently disabled) Add support for race condition parsing. Need more refactoring to enable.
    Source code(tar.gz)
    Source code(zip)
  • v1.2.1(Jun 2, 2019)

  • v1.2.0(May 13, 2019)

    • Updated dependencies and switch from gopkg to go mod.
    • Palette was moved from stack to internal; it was never meant to be exposed publicly.
      • Please ping the maintainer if this breaks you.
    • Fixed unit test to work on go1.11 and later.
    • Stopped using github.com/maruel/ut.

    More refactoring in package stack is planned but this will be tagged as v2 since this will change the signature.

    Source code(tar.gz)
    Source code(zip)
  • v1.1.1(Mar 10, 2018)

  • v1.1.0(Mar 9, 2018)

    This is a feature release. It includes changes in the last 3 months:

    • Guess $GOROOT and $GOPATH from the stack trace, and try to match with local value.
    • New -html flag, currently rudimentary until someone who knows CSS contributes improvements. wink wink
    • Add cmd/panic, to generate various style of stack traces.
    • Silence SIGQUIT only when reading from stdin.
    Source code(tar.gz)
    Source code(zip)
  • v1.0.2(Dec 2, 2017)

  • v1.0.1(Oct 17, 2017)

  • v1.0.0(Aug 11, 2017)

Owner
M-A
Mostly write state machines. My GitHub contribution graph is a lie: that's what automation is all about, right?
M-A
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