| Issue |
166863
|
| Summary |
[BOLT] Crash with -update-debug-sections when optimizing CPython on Fedora 43 with LLVM 21.1.4
|
| Labels |
BOLT
|
| Assignees |
|
| Reporter |
stratakis
|
Hello,
On a Fedora 43 machine with llvm 21.1.4, binutils 2.45 and glibc 2.42, compiling CPython with Bolt produces a crash.
The build was successful on F42 with llvm 20.1.8, binutils 2.44 and glibc 2.41.
Reproducer for Fedora 43:
`git clone https://github.com/python/cpython.git`
`git checkout 3.14`
`CC=clang ./configure --enable-bolt && make -j`
```
BOLT-INFO: Allocation combiner: 151 empty spaces coalesced (dyn count: 1116607131).
/usr/bin/../lib/gcc/x86_64-redhat-linux/15/../../../../include/c++/15/bits/stl_vector.h:1282: const_reference std::vector<llvm::DWARFDebugLine::FileNameEntry>::operator[](size_type) const [_Tp = llvm::DWARFDebugLine::FileNameEntry, _Alloc = std::allocator<llvm::DWARFDebugLine::FileNameEntry>]: Assertion '__n < this->size()' failed.
#0 0x0000555f75fb2cb3 (/usr/bin/llvm-bolt+0x2eb0cb3)
#1 0x0000555f75fb366c (/usr/bin/llvm-bolt+0x2eb166c)
#2 0x00007ff65f0262c0 __restore_rt (/lib64/libc.so.6+0x1a2c0)
#3 0x00007ff65f0803cc __pthread_kill_implementation (/lib64/libc.so.6+0x743cc)
#4 0x00007ff65f02618e gsignal (/lib64/libc.so.6+0x1a18e)
#5 0x00007ff65f00d6d0 abort (/lib64/libc.so.6+0x16d0)
#6 0x00007ff65f20b084 (/lib64/libstdc++.so.6+0xb084)
#7 0x0000555f76432df3 (/usr/bin/llvm-bolt+0x3330df3)
#8 0x0000555f7644466a (/usr/bin/llvm-bolt+0x334266a)
#9 0x0000555f764455ae (/usr/bin/llvm-bolt+0x33435ae)
#10 0x0000555f76444fea (/usr/bin/llvm-bolt+0x3342fea)
#11 0x0000555f76443284 (/usr/bin/llvm-bolt+0x3341284)
#12 0x0000555f76036adb (/usr/bin/llvm-bolt+0x2f34adb)
#13 0x0000555f75687db9 (/usr/bin/llvm-bolt+0x2585db9)
#14 0x00007ff65f00f5b5 __libc_start_call_main (/lib64/libc.so.6+0x35b5)
#15 0x00007ff65f00f668 __libc_start_main@GLIBC_2.2.5 (/lib64/libc.so.6+0x3668)
#16 0x0000555f75677885 (/usr/bin/llvm-bolt+0x2575885)
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0. Program arguments: /usr/bin/llvm-bolt python.prebolt -o python.bolt -data="" -update-debug-sections -skip-funcs=_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1 -reorder-blocks=ext-tsp -reorder-functions=cdsort -split-functions -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=none -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot
```
The error goes away if I remove the -update-debug-sections from the python's configure:
```diff
diff --git a/configure b/configure
index 2c403f4965d..50335e29f05 100755
--- a/configure
+++ b/configure
@@ -9387,7 +9387,7 @@ fi
printf %s "checking BOLT_COMMON_FLAGS... " >&6; }
if test -z "${BOLT_COMMON_FLAGS}"
then
- BOLT_COMMON_FLAGS=" -update-debug-sections -skip-funcs=_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1 "
+ BOLT_COMMON_FLAGS=" -skip-funcs=_PyEval_EvalFrameDefault,sre_ucs1_match/1,sre_ucs2_match/1,sre_ucs4_match/1 "
fi
diff --git a/configure.ac b/configure.ac
index 07b005bacaf..c49f1edb975 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2150,8 +2150,6 @@ then
AS_VAR_SET(
[BOLT_COMMON_FLAGS],
[m4_normalize("
- [-update-debug-sections]
-
dnl At least LLVM 19.x doesn't support computed gotos in PIC compiled code.
dnl Exclude functions containing computed gotos.
dnl TODO this may be fixed in LLVM 20.x via https://github.com/llvm/llvm-project/pull/120267.
```
Maybe related issue: https://github.com/llvm/llvm-project/issues/67966
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