| Commit message (Collapse) | Author | Age | Files | Lines |
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The caller won't be able to progress, but better crash than use random
addr.
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If the value changes between sem_wait's read and the gsync_wait call,
the kernel will return KERN_INVALID_ARGUMENT, which we have to interpret
as the value having already changed.
This fixes applications (e.g. libgo) seeing sem_wait erroneously return
KERN_INVALID_ARGUMENT.
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The kernel actually verifies it, and a garbage value in the register
causes improper system call failures.
Fixes commit c1c0dea38833751f36a145c32 ("Linux: Remove epoll_create,
inotify_init from syscalls.list") and commit d1d23b134244d59c4d6ef2295
("Lninux: consolidate epoll_create implementation").
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Add the MADV_COLLAPSE constant from Linux 6.1 to bits/mman-linux.h and
the hppa bits/mman.h.
Tested for x86_64.
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This patch increases the value of SIGSTKSZ and MINSIGSTKSZ
for powerpc64 similar to the kernel commit
2f82ec19757f58549467db568c56e7dfff8af283 to allow
further expansion of the signal stack frame size.
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This patch updates the kernel version in the tests tst-mman-consts.py,
tst-mount-consts.py and tst-pidfd-consts.py to 6.1. (There are no new
constants covered by these tests in 6.1 that need any other header
changes.)
Tested with build-many-glibcs.py.
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Linux 6.1 has no new syscalls. Update the version number in
syscall-names.list to reflect that it is still current for 6.1.
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vfprintf is entangled with vfwprintf (of course), __printf_fp,
__printf_fphex, __vstrfmon_l_internal, and the strfrom family of
functions. The latter use the internal snprintf functionality,
so vsnprintf is converted as well.
The simples conversion is __printf_fphex, followed by
__vstrfmon_l_internal and __printf_fp, and finally
__vfprintf_internal and __vfwprintf_internal. __vsnprintf_internal
and strfrom* are mostly consuming the new interfaces, so they
are comparatively simple.
__printf_fp is a public symbol, so the FILE *-based interface
had to preserved.
The __printf_fp rewrite does not change the actual binary-to-decimal
conversion algorithm, and digits are still not emitted directly to
the target buffer. However, the staging buffer now uses bytes
instead of wide characters, and one buffer copy is eliminated.
The changes are at least performance-neutral in my testing.
Floating point printing and snprintf improved measurably, so that
this Lua script
for i=1,5000000 do
print(i, i * math.pi)
end
runs about 5% faster for me. To preserve fprintf performance for
a simple "%d" format, this commit has some logic changes under
LABEL (unsigned_number) to avoid additional function calls. There
are certainly some very easy performance improvements here: binary,
octal and hexadecimal formatting can easily avoid the temporary work
buffer (the number of digits can be computed ahead-of-time using one
of the __builtin_clz* built-ins). Decimal formatting can use a
specialized version of _itoa_word for base 10.
The existing (inconsistent) width handling between strfmon and printf
is preserved here. __print_fp_buffer_1 would have to use
__translated_number_width to achieve ISO conformance for printf.
Test expectations in libio/tst-vtables-common.c are adjusted because
the internal staging buffer merges all virtual function calls into
one.
In general, stack buffer usage is greatly reduced, particularly for
unbuffered input streams. __printf_fp can still use a large buffer
in binary128 mode for %g, though.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Their presence causes stub warnings to be created on architectures
which do not implement them.
Fixes commit d1d23b134244d59c4d6ef2295 ("Lninux: consolidate
epoll_create implementation") and commit 842128f160a48e5545900ea3b
("Linux: consolidate inotify_init implementation").
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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8b8c768e3c70 ("Force use of -ffreestanding when checking for gnumach
headers") was passing -ffreestanding to CFLAGS only, but headers checks are
performed with the preprocessor, so we rather need to pass it to CPPFLAGS.
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Without this ./configure assumes that we are in a fully hosted
environment, which might not be the case. After this patch, we can rely on
the freestanding header files provided by GCC such as stdint.h.
Message-Id: <Y5+0V9osFc/zXMq0@mars>
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#29863]
In the case of INCORRECT usage of `memcmp(a, b, N)` where `a` and `b`
are concurrently modified as `memcmp` runs, there can be a SIGSEGV
in `L(ret_nonzero_vec_end_0)` because the sequential logic
assumes that `(rdx - 32 + rax)` is a positive 32-bit integer.
To be clear, this change does not mean the usage of `memcmp` is
supported. The program behaviour is undefined (UB) in the
presence of data races, and `memcmp` is incorrect when the values
of `a` and/or `b` are modified concurrently (data race). This UB
may manifest itself as a SIGSEGV. That being said, if we can
allow the idiomatic use cases, like those in yottadb with
opportunistic concurrency control (OCC), to execute without a
SIGSEGV, at no cost to regular use cases, then we can aim to
minimize harm to those existing users.
The fix replaces a 32-bit `addl %edx, %eax` with the 64-bit variant
`addq %rdx, %rax`. The 1-extra byte of code size from using the
64-bit instruction doesn't contribute to overall code size as the
next target is aligned and has multiple bytes of `nop` padding
before it. As well all the logic between the add and `ret` still
fits in the same fetch block, so the cost of this change is
basically zero.
The relevant sequential logic can be seen in the following
pseudo-code:
```
/*
* rsi = a
* rdi = b
* rdx = len - 32
*/
/* cmp a[0:15] and b[0:15]. Since length is known to be [17, 32]
in this case, this check is also assumed to cover a[0:(31 - len)]
and b[0:(31 - len)]. */
movups (%rsi), %xmm0
movups (%rdi), %xmm1
PCMPEQ %xmm0, %xmm1
pmovmskb %xmm1, %eax
subl %ecx, %eax
jnz L(END_NEQ)
/* cmp a[len-16:len-1] and b[len-16:len-1]. */
movups 16(%rsi, %rdx), %xmm0
movups 16(%rdi, %rdx), %xmm1
PCMPEQ %xmm0, %xmm1
pmovmskb %xmm1, %eax
subl %ecx, %eax
jnz L(END_NEQ2)
ret
L(END2):
/* Position first mismatch. */
bsfl %eax, %eax
/* The sequential version is able to assume this value is a
positive 32-bit value because the first check included bytes in
range a[0:(31 - len)] and b[0:(31 - len)] so `eax` must be
greater than `31 - len` so the minimum value of `edx` + `eax` is
`(len - 32) + (32 - len) >= 0`. In the concurrent case, however,
`a` or `b` could have been changed so a mismatch in `eax` less or
equal than `(31 - len)` is possible (the new low bound is `(16 -
len)`. This can result in a negative 32-bit signed integer, which
when zero extended to 64-bits is a random large value this out
out of bounds. */
addl %edx, %eax
/* Crash here because 32-bit negative number in `eax` zero
extends to out of bounds 64-bit offset. */
movzbl 16(%rdi, %rax), %ecx
movzbl 16(%rsi, %rax), %eax
```
This fix is quite simple, just make the `addl %edx, %eax` 64 bit (i.e
`addq %rdx, %rax`). This prevents the 32-bit zero extension
and since `eax` is still a low bound of `16 - len` the `rdx + rax`
is bound by `(len - 32) - (16 - len) >= -16`. Since we have a
fixed offset of `16` in the memory access this must be in bounds.
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A recent GCC change resulted in localplt test failures on sparc64
because of references to _Qp_fgt. This is analogous to all the other
floating-point symbols allowed in localplt.data, so it seems
appropriate to allow this one as well.
Tested with build-many-glibcs.py for sparc64-linux-gnu (GCC mainline),
where it fixes the test failure.
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The generic (sysdeps/unix/sysv/linux/generic/bits/typesizes.h) and
default (bits/typesizes.h) differs in two fields:
bits/typesizes.h Linux generic
__NLINK_T_TYPE __UWORD_TYPE __U32_TYPE
__BLKSIZE_T_TYPE __SLONGWORD_TYPE __S32_TYPE
Sinceit leads to different C++ mangling names, the default typesize.h
is copied for the requires archtiectures and the generic is make the
default Linux one.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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It is currently used for csky, arc, nios2, and or1k. Newer 64 bit
architecture, like riscv32 and loongarch, reimplement it to override
F_GETLK64/F_SETLK64/F_SETLKW64.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And copy the current default one to required ABIs.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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The includes chain is added on each architecture sysdep.h and
the __NR__llseek hack is moved to lseek.c and lseek64.c.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And disable if kernel does not support it.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And disable if kernel does not support it.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And disable if kernel does not support it.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And disable if kernel does not support it.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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And disable if kernel does not support it.
Checked on x86_64-linux-gnu and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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This is similar to other LFS consolidation, where the non-LFS is only
built if __OFF_T_MATCHES_OFF64_T is not defined and the LFS version
is aliased to non-LFS name if __OFF_T_MATCHES_OFF64_T is defined.
For non-LFS variant, use sendfile syscall if defined, otherwise use
sendfile64 plus the offset overflow check (as generic implementation).
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use unlink syscall if defined, otherwise use unlinkat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use symlink syscall if defined, otherwise use symlinkat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use rmdir syscall if defined, otherwise use unlinkat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use readlink syscall if defined, otherwise readlinkat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use mkdir syscall if defined, otherwise use mkdirat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use link syscall if defined, otherwise use linkat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use lchown syscall if defined, otherwise use fchownat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use inotify_init syscall if defined, otherwise use inotify_init1.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use epoll_create syscall if defined, otherwise use epoll_create1.
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use dup2 syscall if defined, otherwise use dup3.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use chown syscall if defined, otherwise use fchownat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use chmod syscall if defined, otherwise use fchmodat.
Checked on x86_64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
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Use the generic implementation as the default, since the syscall
is supported by all architectures.
Also cleanup some headers and remove the INTERNAL_SYSCALL_ERROR_P
usage (the INTERNAL_SYSCALL_CALL macro already returns an negative
value if an error occurs).
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The linux syscall ABI returns long, so the generic syscall code for
linux should use long for the return value.
This fixes the truncation of the return value of the syscall function
when that does not fit into an int.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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This patch is used to fix address out-of-bounds error when building
Chrome.
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The assembler is not issued directly, but rather always through CC
wrapper. The binutils version check if done with LD instead.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Assume linker has gnu argument input style.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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Previously, getrandom would, each time it's called, traverse the file
system to find /dev/urandom, fetch some random data from it, then throw
away that port. This is quite slow, while calls to getrandom are
genrally expected to be fast.
Additionally, this means that getrandom can not work when /dev/urandom
is unavailable, such as inside a chroot that lacks one. User programs
expect calls to getrandom to work inside a chroot if they first call
getrandom outside of the chroot.
In particular, this is known to break the OpenSSH server, and in that
case the issue is exacerbated by the API of arc4random, which prevents
it from properly reporting errors, forcing glibc to abort on failure.
This causes sshd to just die once it tries to generate a random number.
Caching the random server port, in a manner similar to how socket
server ports are cached, both improves the performance and works around
the chroot issue.
Tested on i686-gnu with the following program:
pthread_barrier_t barrier;
void *worker(void*) {
pthread_barrier_wait(&barrier);
uint32_t sum = 0;
for (int i = 0; i < 10000; i++) {
sum += arc4random();
}
return (void *)(uintptr_t) sum;
}
int main() {
pthread_t threads[THREAD_COUNT];
pthread_barrier_init(&barrier, NULL, THREAD_COUNT);
for (int i = 0; i < THREAD_COUNT; i++) {
pthread_create(&threads[i], NULL, worker, NULL);
}
for (int i = 0; i < THREAD_COUNT; i++) {
void *retval;
pthread_join(threads[i], &retval);
printf("Thread %i: %lu\n", i, (unsigned long)(uintptr_t) retval);
}
In my totally unscientific benchmark, with this patch, this completes
in about 7 seconds, whereas previously it took about 50 seconds. This
program was also used to test that getrandom () doesn't explode if the
random server dies, but instead reopens the /dev/urandom anew. I have
also verified that with this patch, OpenSSH can once again accept
connections properly.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20221202135558.23781-1-bugaevc@gmail.com>
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This patch cleans up the power4 strncmp optimization for powerpc64 which
is unlikely to be used anywhere.
Tested on ppc64le with and without --disable-multi-arch flag.
Reviewed-by: Paul E. Murphy <murphyp@linux.ibm.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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On x32, the size_t parameter may be passed in the lower 32 bits of a
64-bit register with the non-zero upper 32 bits. The string/memory
functions written in assembly can only use the lower 32 bits of a
64-bit register as length or must clear the upper 32 bits before using
the full 64-bit register for length.
This pach fixes strncpy for x32. Tested on x86-64 and x32. On x86-64,
libc.so is the same with and without the fix.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
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On x32, the size_t parameter may be passed in the lower 32 bits of a
64-bit register with the non-zero upper 32 bits. The string/memory
functions written in assembly can only use the lower 32 bits of a
64-bit register as length or must clear the upper 32 bits before using
the full 64-bit register for length.
This pach fixes strncat for x32. Tested on x86-64 and x32. On x86-64,
libc.so is the same with and without the fix.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>
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While porting ARCv2 to elfutils [1], it was brought up that the
necessary changes to the project's libelf/elf.h must come from
glibc, because they sync it from glibc [2]. Therefore, this patch
is to update ARC entries in elf/elf.h.
The majority of the update is about adding new definitions,
specially for the relocations. However, there is one rename, one
deletion, and one change:
- R_ARC_JUMP_SLOT renamed to R_ARC_JMP_SLOT to match binutils.
- R_ARC_B26 removed because it is unused and deprecated.
- R_ARC_TLS_DTPOFF_S9 changed from 0x4a to the correct value 0x49.
Finally, a specific SHT class for ARC has been added to glibcelf.py.
Else, it would result in a collision:
_register_elf_h(Sht, ranges=True,
File "/src/glibc/scripts/glibcelf.py", line x, in _register_elf_h
raise ValueError('duplicate value {}: {}, {}'.format(
ValueError: duplicate value 1879048193:
SHT_ARC_ATTRIBUTES, SHT_X86_64_UNWIND
[1]
https://sourceware.org/pipermail/elfutils-devel/2022q4/005530.html
[2]
https://sourceware.org/pipermail/elfutils-devel/2022q4/005548.html
No regression has been observed after applying this patch. Below
follows the result:
UNSUPPORTED: crypt/cert
UNSUPPORTED: elf/tst-audit22
FAIL: elf/tst-audit25a
FAIL: elf/tst-audit25b
FAIL: elf/tst-bz15311
FAIL: elf/tst-bz28937
FAIL: elf/tst-dlmopen4
UNSUPPORTED: elf/tst-dlopen-self-container
UNSUPPORTED: elf/tst-dlopen-tlsmodid-container
UNSUPPORTED: elf/tst-glibc-hwcaps-prepend-cache
UNSUPPORTED: elf/tst-ldconfig-bad-aux-cache
UNSUPPORTED: elf/tst-ldconfig-ld_so_conf-update
UNSUPPORTED: elf/tst-pldd
UNSUPPORTED: elf/tst-preload-pthread-libc
XPASS: elf/tst-protected1a
XPASS: elf/tst-protected1b
FAIL: elf/tst-tls-allocation-failure-static-patched
FAIL: elf/tst-tls1
FAIL: elf/tst-tls3
FAIL: elf/tst-tlsalign-extern
UNSUPPORTED: elf/tst-valgrind-smoke
UNSUPPORTED: grp/tst-initgroups1
UNSUPPORTED: grp/tst-initgroups2
UNSUPPORTED: io/tst-getcwd-smallbuff
UNSUPPORTED: locale/tst-localedef-path-norm
FAIL: localedata/sort-test
UNSUPPORTED: localedata/tst-localedef-hardlinks
FAIL: malloc/tst-malloc-thread-fail-malloc-check
FAIL: malloc/tst-malloc_info-malloc-check
UNSUPPORTED: math/test-fesetexcept-traps
UNSUPPORTED: math/test-fexcept-traps
UNSUPPORTED: math/test-nearbyint-except
UNSUPPORTED: math/test-nearbyint-except-2
UNSUPPORTED: misc/tst-adjtimex
UNSUPPORTED: misc/tst-clock_adjtime
FAIL: misc/tst-misalign-clone
FAIL: misc/tst-misalign-clone-internal
UNSUPPORTED: misc/tst-ntp_adjtime
UNSUPPORTED: misc/tst-pkey
UNSUPPORTED: misc/tst-rseq
UNSUPPORTED: misc/tst-rseq-disable
UNSUPPORTED: misc/tst-syslog
UNSUPPORTED: misc/tst-ttyname
FAIL: nptl/test-cond-printers
FAIL: nptl/test-condattr-printers
FAIL: nptl/test-mutex-printers
FAIL: nptl/test-mutexattr-printers
FAIL: nptl/test-rwlock-printers
FAIL: nptl/test-rwlockattr-printers
UNSUPPORTED: nptl/tst-pthread-gdb-attach
UNSUPPORTED: nptl/tst-pthread-gdb-attach-static
UNSUPPORTED: nptl/tst-pthread-getattr
UNSUPPORTED: nptl/tst-rseq-nptl
UNSUPPORTED: nss/tst-nss-compat1
UNSUPPORTED: nss/tst-nss-db-endgrent
UNSUPPORTED: nss/tst-nss-db-endpwent
UNSUPPORTED: nss/tst-nss-files-hosts-long
UNSUPPORTED: nss/tst-nss-gai-actions
UNSUPPORTED: nss/tst-nss-test3
UNSUPPORTED: nss/tst-reload1
UNSUPPORTED: nss/tst-reload2
UNSUPPORTED: posix/bug-ga2
UNSUPPORTED: posix/bug-ga2-mem
FAIL: posix/globtest
UNSUPPORTED: posix/tst-vfork3
UNSUPPORTED: posix/tst-vfork3-mem
UNSUPPORTED: resolv/mtrace-tst-leaks2
UNSUPPORTED: resolv/tst-leaks2
UNSUPPORTED: resolv/tst-resolv-ai_idn
UNSUPPORTED: resolv/tst-resolv-ai_idn-latin1
UNSUPPORTED: resolv/tst-resolv-res_init
UNSUPPORTED: resolv/tst-resolv-res_init-thread
UNSUPPORTED: rt/tst-bz28213
UNSUPPORTED: rt/tst-mqueue1
UNSUPPORTED: rt/tst-mqueue10
UNSUPPORTED: rt/tst-mqueue2
UNSUPPORTED: rt/tst-mqueue3
UNSUPPORTED: rt/tst-mqueue4
UNSUPPORTED: rt/tst-mqueue5
UNSUPPORTED: rt/tst-mqueue6
UNSUPPORTED: rt/tst-mqueue8
UNSUPPORTED: rt/tst-mqueue8x
UNSUPPORTED: rt/tst-mqueue9
UNSUPPORTED: stdlib/test-bz22786
UNSUPPORTED: stdlib/tst-system
UNSUPPORTED: string/test-bcopy
UNSUPPORTED: string/test-memmove
UNSUPPORTED: string/tst-memmove-overflow
UNSUPPORTED: string/tst-strerror
UNSUPPORTED: string/tst-strsignal
UNSUPPORTED: time/tst-clock_settime
UNSUPPORTED: time/tst-settimeofday
Summary of test results:
21 FAIL
4184 PASS
69 UNSUPPORTED
16 XFAIL
2 XPASS
Signed-off-by: Shahab Vahedi <shahab@synopsys.com>
Signed-off-by: Vineet Gupta <vineet.gupta@linux.dev>
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