Regex error

[matthiasbeyer]

cargo profiler crashes for me:

Profiling imag-counter with cachegrind...
error: regex error -- please file a bug.
third party subcommand `cargo-profiler` exited unsuccessfully

How to investigate?

[kernelmachine]

hey there,

Cool, you'll be the guinea pig here in this type of bug fix :) There's probably something in your cachegrind output that's screwing up the regex. We'll just have to improve the regex.

We're gonna have to dig into the original cachegrind output to figure out what's going on. Could you send me the cachegrind-out-file from valgrind itself? I can investigate.

$ valgrind --tool=cachegrind --cachegrind-out-file=cachegrind.txt

[kernelmachine]

As an aside, I wonder how to improve the error message so that it's easier to investigate this type of stuff. Something to think about.

[matthiasbeyer]

Here is the paste: http://pastebin.com/NaZs4BCg

It's 8k lines so I pasted it on pastebin.

[kernelmachine]

sounds good, thanks.

[kernelmachine]

hm, this is pretty weird. a sample of your cachegrind output:

:do_lookup_x   24 38,621   742   235 18,455    41     8  ???
:_dl_relocate_object,101 3,003 2,861  8,630 1,852 1,827  ???
:__GI_memset    5  4,590     1     0 17,285   552   506  ???
:je_arena_tcache_fill_small 25     0  3,704   132   128  ???
:__memcpy_sse2_unaligned   107    89 15,036 1,097   704  ???
:strcmp  146   54 10,884   299   106      0     0     0  ???
:_IO_vfscanf   53 14,422    10     6  6,838     7     0  ???
:_dl_lookup_symbol_x,009   192   118  4,945    34     9  ???
:check_match    6 15,106   428   168  7,013    23     3  ???
:raw_vec::RawVec$LT$T$GT$.Drop::drop::h14124021383039242148ome/m/archive/development/rust/imag/imag-counter/src/liballoc/raw_vec.rs
:____strtoul_l_internal2    12     8  1,128     2     0  ???
:raw_vec::RawVec$LT$T$GT$::unsafe_no_drop_flag_needs_drop::h1846786809691398471pment/rust/imag/imag-counter/src/liballoc/raw_vec.rs

I'm not entirely sure what's going on here. It seems like metrics are being overwritten by function names...and function names are at the beginning of the line, instead of their usual place at the end. More complicated issue than I originally had thought.

I'll probably do more research to try to figure out why this might be happening, but it's very strange. Hopefully this isn't a consistent issue.

[regexident]

Here's one from me, in case that helps: http://pastebin.com/xUTH1E2Y
(using valgrind installed via brew install valgrind on OS X 10.11.4)

[russellb23]

Same issue:
`

cargo profiler callgrind -n 10

Compiling problem2 in debug mode...

Profiling problem2 with callgrind...
error: Regex error -- please file a bug. In bug report, please include the original output file from profiler, e.g. from valgrind --tool=cachegrind --cachegrind-out-file=cachegrind.txt`

callgrind.txt

[JAicewizard]

Installed valgrind from arch linux repos 3.15.0.1 and having the same issues.
https://pastebin.com/X562yamL

[JAicewizard]

@svenstaro
you're the new maintainer, I don't know if you get notifications for threads you didn't subscribe to.

[svenstaro]

Oh crap, you're right. I didn't . I'll take a look, sorry!

[PsychoInferno]

Another regex error: pastebin

[fabracht]

I'm having the same issue. Has this been solved?