Passing `-march=rv64gcb_zicond` parameter to compiler with JIT enabled causes tests to fail on RISC-V

[Puqns67]

This issue occurs only when both the b extension and the zicond extension are enabled simultaneously, and it appears in both gcc 15.2.0 and clang 21.1.4.

LastTest.log

Build & test log in 3b91977

puqns67@azusa ~/C/pcre2 (master)> cmake -Bbuild -GNinja -DPCRE2_SUPPORT_JIT=ON
-- Using CMake version 4.1.2 (/usr/bin/cmake)
-- The C compiler identification is Clang 21.1.4
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/lib/llvm/21/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found BZip2: /usr/lib64/libbz2.so (found version "1.0.8")
-- Looking for BZ2_bzCompressInit
-- Looking for BZ2_bzCompressInit - found
-- Found ZLIB: /usr/lib64/libz.so (found version "1.3.1")
-- Looking for readline
-- Looking for readline - found
-- Found Readline: /usr/lib64/libreadline.so
-- Could NOT find Editline (missing: EDITLINE_LIBRARY EDITLINE_INCLUDE_DIR) 
-- Looking for assert.h
-- Looking for assert.h - found
-- Looking for dirent.h
-- Looking for dirent.h - found
-- Looking for sys/stat.h
-- Looking for sys/stat.h - found
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for unistd.h
-- Looking for unistd.h - found
-- Looking for windows.h
-- Looking for windows.h - not found
-- Detecting platform feature test macros
-- Detecting platform feature test macros - _GNU_SOURCE
-- Looking for mkostemp
-- Looking for mkostemp - found
-- Looking for memfd_create
-- Looking for memfd_create - found
-- Looking for secure_getenv
-- Looking for secure_getenv - found
-- Performing Test HAVE_REALPATH
-- Performing Test HAVE_REALPATH - Success
-- Performing Test HAVE_ATTRIBUTE_UNINITIALIZED
-- Performing Test HAVE_ATTRIBUTE_UNINITIALIZED - Success
-- Performing Test HAVE_VISIBILITY
-- Performing Test HAVE_VISIBILITY - Success
-- Performing Test HAVE_BUILTIN_ASSUME
-- Performing Test HAVE_BUILTIN_ASSUME - Failed
-- Performing Test HAVE_BUILTIN_MUL_OVERFLOW
-- Performing Test HAVE_BUILTIN_MUL_OVERFLOW - Success
-- Performing Test HAVE_BUILTIN_UNREACHABLE
-- Performing Test HAVE_BUILTIN_UNREACHABLE - Success
-- Detecting linker version script support
-- Detecting linker version script support - yes (--version-script)
-- Performing Test INTEL_CET_ENABLED
-- Performing Test INTEL_CET_ENABLED - Failed
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- 
-- 
-- PCRE2-10.48 configuration summary:
-- 
--   Install prefix .................... : /usr/local
--   C compiler ........................ : /usr/lib/llvm/21/bin/clang
--   C compiler flags .................. : -march=rv64gcb_zicond 
-- 
--   Build type ........................ : 
--   Build 8 bit pcre2 library ......... : ON
--   Build 16 bit pcre2 library ........ : OFF
--   Build 32 bit pcre2 library ........ : OFF
--   Include debugging code ............ : IfDebugBuild
--   Enable JIT compiling support ...... : ON
--   Use SELinux allocator in JIT ...... : OFF
--   Enable Unicode support ............ : ON
--   Newline char/sequence ............. : LF
--   \R matches only ANYCRLF ........... : OFF
--   \C is disabled .................... : OFF
--   EBCDIC coding ..................... : OFF
--   EBCDIC code for NL ................ : n/a
--   EBCDIC coding ignoring compiler ... : OFF
--   Rebuild char tables ............... : OFF
--   Internal link size ................ : 2
--   Maximum variable lookbehind ....... : 255
--   Nested parentheses limit .......... : 250
--   Heap limit ........................ : 20000000
--   Match limit ....................... : 10000000
--   Match depth limit ................. : MATCH_LIMIT
--   Build shared libs ................. : OFF
--       with symbol versioning ........ : ON
--   Build static libs ................. : ON
--       with PIC enabled .............. : OFF
--   Build pcre2grep ................... : ON
--   Enable JIT in pcre2grep ........... : ON
--   Enable callouts in pcre2grep ...... : ON
--   Enable callout fork in pcre2grep .. : ON
--   Initial buffer size for pcre2grep . : 20480
--   Maximum buffer size for pcre2grep . : 1048576
--   Build tests (implies pcre2test .... : ON
--                and pcre2grep)
--   Link pcre2grep with libz .......... : ON
--   Link pcre2grep with libbz2 ........ : ON
--   Link pcre2test with libeditline ... : Library not found
--   Link pcre2test with libreadline ... : ON
--   Enable Valgrind support ........... : OFF
--   Use %zu and %td ................... : AUTO
-- 
-- Configuring done (14.2s)
-- Generating done (0.1s)
-- Build files have been written to: /home/puqns67/Code/pcre2/build
puqns67@azusa ~/C/pcre2 (master)> cmake --build build --verbose 
Change Dir: '/home/puqns67/Code/pcre2/build'
Run Build Command(s): /usr/bin/ninja -v

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puqns67@azusa ~/C/pcre2 (master)> cd build

puqns67@azusa ~/C/p/build (master)> ctest

When testing is complete, review test output in the

"/home/puqns67/Code/pcre2/build/Testing/Temporary" folder.
Test project /home/puqns67/Code/pcre2/build

Start 1: pcre2_test

1/4 Test #1: pcre2_test .......................***Failed    6.07 sec

Start 2: pcre2_grep_test

2/4 Test #2: pcre2_grep_test ..................   Passed    1.97 sec

Start 3: pcre2_jit_test

3/4 Test #3: pcre2_jit_test ...................   Passed   25.13 sec

Start 4: pcre2posix_test

4/4 Test #4: pcre2posix_test ..................   Passed    0.01 sec
75% tests passed, 1 tests failed out of 4
Total Test time (real) =  33.18 sec
The following tests FAILED:

1 - pcre2_test (Failed)

Errors while running CTest

Output from these tests are in: /home/puqns67/Code/pcre2/build/Testing/Temporary/LastTest.log

Use "--rerun-failed --output-on-failure" to re-run the failed cases verbosely.

puqns67@azusa ~/C/p/build (master) [8]>

Link to downstream: https://bugs.gentoo.org/964425

[zherczeg]

Am I see it right that only Test 0 fails?

[zherczeg]

target CPU of SLJIT compiler: RISC-V-64 (rv64gac_zba_zbb_zicond) 64bit (little endian + unaligned) Is this correct?

[carenas]

Am I see it right that only Test 0 fails?

It looks like it was only Test 0, but the output of the failure should be in testSoutput; but you are correct that it doesn't affect the standalone JIT test.

FWIW, had confirmed that it works with in a SiFive (with gcc -march=rv64imafdc_zicntr_zicsr_zifencei_zihpm_zca_zcd_zba_zbb), but funny enough that CPU have neither the "b" or "zicond" extensions.

[zherczeg]

The b is simply the combination of zba, zbb, zbc, but sljit don't use zbc at the moment. The interesting part is the compressed (c) and conditional (zicond) instructions. The conditional instruction support is a recent feature, I just noticed it a few weeks ago.

[carenas]

luckily is not "really" an sljit bug, but mostly pcre2test; reproduced it in an Spacemit(R) X60 CPU.

it is an overflow and the following (will obviously need to be split first and enhanced in the PCRE2 side) patch will "fix" it:

diff -ur pcre2-10.47/deps/sljit/sljit_src/sljitNativeRISCV_common.c pcre2-10.47-patched/deps/sljit/sljit_src/sljitNativeRISCV_common.c
--- pcre2-10.47/deps/sljit/sljit_src/sljitNativeRISCV_common.c	2025-10-20 11:35:04.000000000 +0000
+++ pcre2-10.47-patched/deps/sljit/sljit_src/sljitNativeRISCV_common.c	2025-10-27 00:16:00.326769070 +0000
@@ -158,9 +158,9 @@
 {
 	/* The arch string is not entirely correct since 'g' contains 'a'. */
 #if (defined SLJIT_CONFIG_RISCV_32 && SLJIT_CONFIG_RISCV_32)
-	return "RISC-V-32 (rv32g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
+	return "RISCV (rv32g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
 #else /* !SLJIT_CONFIG_RISCV_32 */
-	return "RISC-V-64 (rv64g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
+	return "RISCV (rv64g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
 #endif /* SLJIT_CONFIG_RISCV_32 */
 }
 
diff -ur pcre2-10.47/src/pcre2test.c pcre2-10.47-patched/src/pcre2test.c
--- pcre2-10.47/src/pcre2test.c	2025-10-20 11:35:02.000000000 +0000
+++ pcre2-10.47-patched/src/pcre2test.c	2025-10-27 00:28:12.500272986 +0000
@@ -227,7 +227,7 @@
 #define PATSTACKSIZE 20           /* Pattern stack for save/restore testing */
 #define REPLACE_MODSIZE 100       /* Field for reading 8-bit replacement */
 #define SUBSTITUTE_SUBJECT_MODSIZE 100 /* Field for reading 8-bit subject for substitute */
-#define VERSION_SIZE 64           /* Size of buffer for the version strings */
+#define VERSION_SIZE 80           /* Size of buffer for the version strings */
 #define REPLACE_BUFFSIZE 256      /* Code units for replacement buffer */
 
 /* Default JIT compile options */

[Puqns67]

luckily is not "really" an sljit bug, but mostly pcre2test; reproduced it in an Spacemit(R) X60 CPU.

Yes, I'm also using the Spacemit® X60 CPU.

it is an overflow and the following (will obviously need to be split first and enhanced in the PCRE2 side) patch will "fix" it:

diff -ur pcre2-10.47/deps/sljit/sljit_src/sljitNativeRISCV_common.c pcre2-10.47-patched/deps/sljit/sljit_src/sljitNativeRISCV_common.c
--- pcre2-10.47/deps/sljit/sljit_src/sljitNativeRISCV_common.c	2025-10-20 11:35:04.000000000 +0000
+++ pcre2-10.47-patched/deps/sljit/sljit_src/sljitNativeRISCV_common.c	2025-10-27 00:16:00.326769070 +0000
@@ -158,9 +158,9 @@
 {
 	/* The arch string is not entirely correct since 'g' contains 'a'. */
 #if (defined SLJIT_CONFIG_RISCV_32 && SLJIT_CONFIG_RISCV_32)
-	return "RISC-V-32 (rv32g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
+	return "RISCV (rv32g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
 #else /* !SLJIT_CONFIG_RISCV_32 */
-	return "RISC-V-64 (rv64g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
+	return "RISCV (rv64g" RISCV_ATOMIC_INFO RISCV_COMPRESSED_INFO RISCV_VECTOR_INFO RISCV_BITMANIP_A_INFO RISCV_BITMANIP_B_INFO RISCV_ICOND_INFO ")" SLJIT_CPUINFO;
 #endif /* SLJIT_CONFIG_RISCV_32 */
 }
 
diff -ur pcre2-10.47/src/pcre2test.c pcre2-10.47-patched/src/pcre2test.c
--- pcre2-10.47/src/pcre2test.c	2025-10-20 11:35:02.000000000 +0000
+++ pcre2-10.47-patched/src/pcre2test.c	2025-10-27 00:28:12.500272986 +0000
@@ -227,7 +227,7 @@
 #define PATSTACKSIZE 20           /* Pattern stack for save/restore testing */
 #define REPLACE_MODSIZE 100       /* Field for reading 8-bit replacement */
 #define SUBSTITUTE_SUBJECT_MODSIZE 100 /* Field for reading 8-bit subject for substitute */
-#define VERSION_SIZE 64           /* Size of buffer for the version strings */
+#define VERSION_SIZE 80           /* Size of buffer for the version strings */
 #define REPLACE_BUFFSIZE 256      /* Code units for replacement buffer */
 
 /* Default JIT compile options */

After applying this patch, the test suite also passes on my board.

[zherczeg]

Thank you for debugging it

[NWilson]

Hmm. I wish there was a better system for documenting the required buffer size.

The API does allow you to query the buffer and check you have the required size - we should at least do that.

[carenas]

Hmm. I wish there was a better system for documenting the required buffer size.

There is, I never got to complete the full implementation of it though, but was planning on doing so as part of this fix.

Basically, need to build on top of #776 and make sure the code and documentation for this is on sync and "debugable"

[NWilson]

@Puqns67 Getting back to the original report - do you require a fix immediately in Gentoo? Even distros with RISC-V builds typically don't build for this specific CPU in their CI, so are not blocked for accepting PCRE2 10.47.

If Gentoo does require a patch, Carlo's fix #835 (6454fac) is blessed and can be packaged safely (as it only a fix to a crash in the pcre2test helper application).

I have also made a further related fix in #836.

[Puqns67]

@Puqns67 Getting back to the original report - do you require a fix immediately in Gentoo? Even distros with RISC-V builds typically don't build for this specific CPU in their CI, so are not blocked for accepting PCRE2 10.47.

If Gentoo does require a patch, Carlo's fix #835 (6454fac) is blessed and can be packaged safely (as it only a fix to a crash in the pcre2test helper application).

I have also made a further related fix in #836.

Thank you for your help. I have already replied in the downstream Bugzilla and am awaiting a response from the Gentoo developers.

[thesamesam]

Thank you all. @NWilson especially thanks for explicitly saying if something is acceptable to backport. It's often not clear and having this said clearly is appreciated. I'm going to pull it in.

We're a source-based distribution so we often get people using configurations we didn't expect, so better to save someone some time.