[Bug gas/30292] Unbounded recursion/infinite loop in eqv expansion since 4faaa10f3fabb345aca006ed67a8be97dc924e9c

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=30292

Sam James <sam at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Unbounded                   |Unbounded
                   |recursion/infinite loop in  |recursion/infinite loop in
                   |eqv expansion               |eqv expansion since
                   |                            |4faaa10f3fabb345aca006ed67a
                   |                            |8be97dc924e9c
                 CC|                            |jbeulich at suse dot com,
                   |                            |sam at gentoo dot org

--- Comment #2 from Sam James <sam at gentoo dot org> ---
Potuz has analysed this in a dupe (PR30294):

(In reply to Potuz from comment #0)
> The [hashtree](https://github.com/prysmaticlabs/hashtree) fails to compile
> since version 2.39 of binutils. GNU's assembler crashes with a SIGSEGV on an
> infinite recursion expanding a macro. This regression was introduced in
> [commit
> 0x4faaa10f3fabb345aca006ed67a8be97dc924e9c](https://sourceware.org/git/
> ?p=binutils-gdb.git;a=commit;h=4faaa10f3fabb345aca006ed67a8be97dc924e9c).
> 
> ## Steps to reproduce
> 
> 1. Download [this file from
> hashtree](https://github.com/prysmaticlabs/hashtree/blob/main/src/
> sha256_avx_x1.S)
> 2. Try to compile it as 
> ```
> $ $ cc -c sha256_avx_x1.S
> cc: internal compiler error: Segmentation fault signal terminated program as
> ```
> 
> The infinite recursion happens expanding the macro that [rotates the
> arguments](https://github.com/prysmaticlabs/hashtree/blob/main/src/
> sha256_avx_x1.S#L160-L170) and it recurses here
> https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gas/config/tc-i386-
> intel.c;h=c139c584573c45e9779a583f12f6b6a0641c2844;hb=HEAD#l551
> 
> 3. Repeat 2 with the commit right before the one marked and compilation
> succeeds. 
> 
> The above assembly is a mod of Intel's assembly from
> https://github.com/intel/intel-ipsec-mb/blob/main/lib/avx_t1/
> sha256_one_block_avx.asm#L159-L171

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