forcemerge 21513 22793 thanks On Wed, Feb 24, 2016 at 8:18 AM, <santiag...@riseup.net> wrote: > Hi, > > This is a long standing bug reported to Debian, still present in 2.23. > It was forwarded at some point, but I cannot find any reference, so I'm > reforwarding it. > > % echo abc | LANG=C grep -E '(.*)(.*)(.*)\3\2\1' > grep: regexec.c:1401: pop_fail_stack: Assertion `num >= 0' failed. > > More info at: https://bugs.debian.org/186568
Correct, this was reported some time ago, both here and in the upstream glibc bugzilla: http://bugs.gnu.org/21513 https://sourceware.org/bugzilla/show_bug.cgi?id=18986 There is currently an "XFAIL" (expected-to-fail) test in grep's test suite that exercises precisely this bug: git.savannah.gnu.org/cgit/grep.git/tree/tests/triple-backref
