https://llvm.org/bugs/show_bug.cgi?id=27649
Bug ID: 27649
Summary: PowerPC Segfault within KMPC Runtime when managing a
large set of tasks
Product: OpenMP
Version: unspecified
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Runtime Library
Assignee: unassignedb...@nondot.org
Reporter: matt.da...@pgroup.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 16311
--> https://llvm.org/bugs/attachment.cgi?id=16311&action=edit
Segfaulting test case
This looks to be a bug when using a large number of tasks (800000). The
segfault seems to manifest with task allocation/reclaim, I get segfaults in
both ___kmp_fast_free and ___kmp_fast_allocate (clang 3.8).
Program received signal SIGSEGV, Segmentation fault.
0x00003fffb7ef9790 in ___kmp_fast_allocate () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
(gdb) bt
#0 0x00003fffb7ef9790 in ___kmp_fast_allocate () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#1 0x00003fffb7f26b54 in __kmp_task_alloc () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#2 0x00003fffb7f26f18 in __kmpc_omp_task_alloc () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#3 0x0000000010000bf4 in .omp_outlined. ()
#4 0x00003fffb7f3293c in __kmp_invoke_microtask () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#5 0x00003fffb7f121ec in __kmp_invoke_task_func () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#6 0x00003fffb7f131e4 in __kmp_fork_call () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#7 0x00003fffb7f029f4 in __kmpc_fork_call () from
/llvm/linuxpower/3.8-openmp/lib/libomp.so
#8 0x0000000010000b00 in main ()
If I define USE_FAST_MEM=0 in a different KMPC library (code from svn
repository 268538 (May 4, 2016), I will still get a segfault:
Program received signal SIGSEGV, Segmentation fault.
0x00003fffb7f02a28 in brel(kmp_info*, void*) () from kmpc/runtime/src/libomp.so
Program received signal SIGSEGV, Segmentation fault.
0x00003fffb7ef7a80 in bget(kmp_info*, long) () from
openmp/runtime/src/libomp.so
(gdb) bt
#0 0x00003fffb7ef7a80 in bget(kmp_info*, long) () from
openmp/runtime/src/libomp.so
#1 0x00003fffb7f26054 in __kmp_task_alloc () from openmp/runtime/src/libomp.so
#2 0x00003fffb7f26418 in __kmpc_omp_task_alloc () from
openmp/runtime/src/libomp.so
#3 0x0000000010000ac4 in .omp_outlined. ()
#4 0x00003fffb7f31e5c in __kmp_invoke_microtask () from
openmp/runtime/src/libomp.so
#5 0x00003fffb7f10ebc in __kmp_invoke_task_func () from
openmp/runtime/src/libomp.so
#6 0x00003fffb7f11eb4 in __kmp_fork_call () from openmp/runtime/src/libomp.so
#7 0x00003fffb7f01cd4 in __kmpc_fork_call () from openmp/runtime/src/libomp.so
#8 0x00000000100009d0 in main ()
Built using:
clang -fopenmp try2.c
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