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From: Mark W. <ma...@so...> - 2017-10-20 12:59:17
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=476b52d62dd9513a97235caad6f0275cbb903fc2 commit 476b52d62dd9513a97235caad6f0275cbb903fc2 Author: Mark Wielaard <ma...@kl...> Date: Fri Oct 20 14:55:06 2017 +0200 Bug #385912. Remove explicit NULL check from none/tests/rlimit_nofile. glibc doesn't guarantee anything about setrlimit with a NULL limit argument. It could just crash (if it needs to adjust the limit) or might silently succeed (as newer glibc do). Just remove the extra check. See also the "setrlimit change to prlimit change in behavior" thread: https://sourceware.org/ml/libc-alpha/2017-10/threads.html#00830 Diff: --- NEWS | 1 + none/tests/rlimit_nofile.c | 8 +++----- 2 files changed, 4 insertions(+), 5 deletions(-) diff --git a/NEWS b/NEWS index 50c0097..11055cf 100644 --- a/NEWS +++ b/NEWS @@ -66,6 +66,7 @@ n-i-bz Fix missing workq_ops operations (macOS) 385183 PPC64, Add support for xscmpeqdp, xscmpgtdp, xscmpgedp, xsmincdp instructions 385334 PPC64, fix vpermr, xxperm, xxpermr mask value. 385868 glibc ld.so _dl_runtime_resolve_avx_slow conditional jump warning. +385912 none/tests/rlimit_nofile fails on newer glibc/kernel. Release 3.13.0 (15 June 2017) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/none/tests/rlimit_nofile.c b/none/tests/rlimit_nofile.c index c6d2be6..1f45612 100644 --- a/none/tests/rlimit_nofile.c +++ b/none/tests/rlimit_nofile.c @@ -98,11 +98,9 @@ int main(int argc, char **argv) perror("open"); } - if (setrlimit(RLIMIT_NOFILE, NULL) != -1 || errno != EFAULT) - { - fprintf(stderr, "setrlimit non addressable arg2 must set errno=EFAULT\n"); - exit(1); - } + /* We used to test setrlimit(RLIMIT_NOFILE, NULL) -1 || errno != EFAULT, + but glibc doesn't give any guarantees that won't just crash, in + newer versions it just silently succeeds... See bug #385912. */ exit(0); } |
|
From: Mark W. <ma...@so...> - 2017-10-20 12:18:04
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=f844689f858d4bb744e59eadaaf984d3fd0b5b50 commit f844689f858d4bb744e59eadaaf984d3fd0b5b50 Author: Mark Wielaard <ma...@kl...> Date: Tue Oct 17 17:49:26 2017 +0200 Suppress _dl_runtime_resolve_avx_slow for memcheck conditional. glibc ld.so has an optimization when resolving a symbol that checks whether or not the upper 128 bits of the ymm registers are zero. If so it uses "cheaper" instructions to save/restore them using the xmm registers. If those upper 128 bits contain undefined values memcheck will issue an Conditional jump or move depends on uninitialised value(s) warning whenever trying to resolve a symbol. This triggers in our sh-mem-vecxxx test cases. Suppress the warning by default. https://bugs.kde.org/show_bug.cgi?id=385868 Diff: --- NEWS | 1 + glibc-2.X.supp.in | 12 ++++++++++++ 2 files changed, 13 insertions(+) diff --git a/NEWS b/NEWS index b043c58..50c0097 100644 --- a/NEWS +++ b/NEWS @@ -65,6 +65,7 @@ n-i-bz Fix missing workq_ops operations (macOS) 385210 PPC64, vpermr instruction could exhaust temporary memory 385183 PPC64, Add support for xscmpeqdp, xscmpgtdp, xscmpgedp, xsmincdp instructions 385334 PPC64, fix vpermr, xxperm, xxpermr mask value. +385868 glibc ld.so _dl_runtime_resolve_avx_slow conditional jump warning. Release 3.13.0 (15 June 2017) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ diff --git a/glibc-2.X.supp.in b/glibc-2.X.supp.in index 8edeb4a..126e8b3 100644 --- a/glibc-2.X.supp.in +++ b/glibc-2.X.supp.in @@ -236,3 +236,15 @@ Memcheck:Cond fun:_dl_relocate_object } + +# glibc ld.so has an optimization when resolving a symbol that checks +# whether or not the upper 128 bits of the ymm registers are zero. If +# so it uses "cheaper" instructions to save/restore them using the xmm +# registers. If those upper 128 bits contain undefined values memcheck +# will issue an Conditional jump or move depends on uninitialised value(s) +# warning whenever trying to resolve a symbol. +{ + dl-trampoline-sse-avx + Memcheck:Cond + fun:_dl_runtime_resolve_avx_slow +} |