[arch-commits] Commit in glibc/trunk (4 files)
Giancarlo Razzolini
grazzolini at archlinux.org
Wed May 12 12:29:40 UTC 2021
Date: Wednesday, May 12, 2021 @ 12:29:39
Author: grazzolini
Revision: 415028
rebuild for gcc 11. Also add the fix for threaded gdb
Added:
glibc/trunk/0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
glibc/trunk/0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch
glibc/trunk/0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch
Modified:
glibc/trunk/PKGBUILD
-----------------------------------------------------------------+
0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch | 308 ++++++++++
0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch | 135 ++++
0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch | 26
PKGBUILD | 21
4 files changed, 487 insertions(+), 3 deletions(-)
Added: 0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
===================================================================
--- 0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch (rev 0)
+++ 0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch 2021-05-12 12:29:39 UTC (rev 415028)
@@ -0,0 +1,308 @@
+From a64afc225240b2b27129ccfb0516d7c958b98040 Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer at redhat.com>
+Date: Wed, 21 Apr 2021 11:50:43 +0200
+Subject: [PATCH 364/576] nptl_db: Support different libpthread/ld.so load
+ orders (bug 27744)
+
+libthread_db is loaded once GDB encounters libpthread, and at this
+point, ld.so may not have been processed by GDB yet. As a result,
+_rtld_global cannot be accessed by regular means from libthread_db.
+To make this work until GDB can be fixed, acess _rtld_global through
+a pointer stored in libpthread.
+
+The new test does not reproduce bug 27744 with
+--disable-hardcoded-path-in-tests, but is still a valid smoke test.
+With --enable-hardcoded-path-in-tests, it is necessary to avoid
+add-symbol-file because this can tickle a GDB bug.
+
+Fixes commit 1daccf403b1bd86370eb94edca794dc106d02039 ("nptl: Move
+stack list variables into _rtld_global").
+
+Tested-by: Emil Velikov <emil.velikov at collabora.com>
+---
+ nptl/Makefile | 19 +++-
+ nptl/pthread_create.c | 8 ++
+ nptl/tst-pthread-gdb-attach-static.c | 1 +
+ nptl/tst-pthread-gdb-attach.c | 143 +++++++++++++++++++++++++++
+ nptl_db/structs.def | 3 +-
+ nptl_db/td_init.c | 15 +--
+ nptl_db/thread_dbP.h | 2 +
+ 7 files changed, 180 insertions(+), 11 deletions(-)
+ create mode 100644 nptl/tst-pthread-gdb-attach-static.c
+ create mode 100644 nptl/tst-pthread-gdb-attach.c
+
+diff --git a/nptl/Makefile b/nptl/Makefile
+index 8fe92d43fa..e665d37e52 100644
+--- a/nptl/Makefile
++++ b/nptl/Makefile
+@@ -313,7 +313,8 @@ tests = tst-attr2 tst-attr3 tst-default-attr \
+ tst-thread-affinity-sched \
+ tst-pthread-defaultattr-free \
+ tst-pthread-attr-sigmask \
+- tst-pthread-timedlock-lockloop
++ tst-pthread-timedlock-lockloop \
++ tst-pthread-gdb-attach tst-pthread-gdb-attach-static
+
+ tests-container = tst-pthread-getattr
+
+@@ -359,6 +360,19 @@ CPPFLAGS-test-cond-printers.c := $(CFLAGS-printers-tests)
+ CPPFLAGS-test-rwlockattr-printers.c := $(CFLAGS-printers-tests)
+ CPPFLAGS-test-rwlock-printers.c := $(CFLAGS-printers-tests)
+
++# Reuse the CFLAGS setting for the GDB attaching test. It needs
++# debugging information.
++CFLAGS-tst-pthread-gdb-attach.c := $(CFLAGS-printers-tests)
++CPPFLAGS-tst-pthread-gdb-attach.c := $(CFLAGS-printers-tests)
++ifeq ($(build-shared)$(build-hardcoded-path-in-tests),yesno)
++CPPFLAGS-tst-pthread-gdb-attach.c += -DDO_ADD_SYMBOL_FILE=1
++else
++CPPFLAGS-tst-pthread-gdb-attach.c += -DDO_ADD_SYMBOL_FILE=0
++endif
++CFLAGS-tst-pthread-gdb-attach-static.c := $(CFLAGS-printers-tests)
++CPPFLAGS-tst-pthread-gdb-attach-static.c := \
++ $(CFLAGS-printers-tests) -DDO_ADD_SYMBOL_FILE=0
++
+ ifeq ($(build-shared),yes)
+ tests-printers-libs := $(shared-thread-library)
+ else
+@@ -430,7 +444,8 @@ link-libc-static := $(common-objpfx)libc.a $(static-gnulib) \
+ tests-static += tst-stackguard1-static \
+ tst-cancel24-static \
+ tst-mutex8-static tst-mutexpi8-static tst-sem11-static \
+- tst-sem12-static tst-cond11-static
++ tst-sem12-static tst-cond11-static \
++ tst-pthread-gdb-attach-static
+
+ tests += tst-cancel24-static
+
+diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
+index 6c645aff48..f13d8e44a4 100644
+--- a/nptl/pthread_create.c
++++ b/nptl/pthread_create.c
+@@ -51,6 +51,14 @@ static td_thr_events_t __nptl_threads_events __attribute_used__;
+ /* Pointer to descriptor with the last event. */
+ static struct pthread *__nptl_last_event __attribute_used__;
+
++#ifdef SHARED
++/* This variable is used to access _rtld_global from libthread_db. If
++ GDB loads libpthread before ld.so, it is not possible to resolve
++ _rtld_global directly during libpthread initialization. */
++static struct rtld_global *__nptl_rtld_global __attribute_used__
++ = &_rtld_global;
++#endif
++
+ /* Number of threads running. */
+ unsigned int __nptl_nthreads = 1;
+
+diff --git a/nptl/tst-pthread-gdb-attach-static.c b/nptl/tst-pthread-gdb-attach-static.c
+new file mode 100644
+index 0000000000..e159632cac
+--- /dev/null
++++ b/nptl/tst-pthread-gdb-attach-static.c
+@@ -0,0 +1 @@
++#include "tst-pthread-gdb-attach.c"
+diff --git a/nptl/tst-pthread-gdb-attach.c b/nptl/tst-pthread-gdb-attach.c
+new file mode 100644
+index 0000000000..0603ad844d
+--- /dev/null
++++ b/nptl/tst-pthread-gdb-attach.c
+@@ -0,0 +1,143 @@
++/* Smoke testing GDB process attach with thread-local variable access.
++ Copyright (C) 2021 Free Software Foundation, Inc.
++ This file is part of the GNU C Library.
++
++ The GNU C Library is free software; you can redistribute it and/or
++ modify it under the terms of the GNU Lesser General Public
++ License as published by the Free Software Foundation; either
++ version 2.1 of the License, or (at your option) any later version.
++
++ The GNU C Library is distributed in the hope that it will be useful,
++ but WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ Lesser General Public License for more details.
++
++ You should have received a copy of the GNU Lesser General Public
++ License along with the GNU C Library; if not, see
++ <https://www.gnu.org/licenses/>. */
++
++/* This test runs GDB against a forked copy of itself, to check
++ whether libthread_db can be loaded, and that access to thread-local
++ variables works. */
++
++#include <errno.h>
++#include <stdlib.h>
++#include <support/check.h>
++#include <support/support.h>
++#include <support/temp_file.h>
++#include <support/test-driver.h>
++#include <support/xstdio.h>
++#include <support/xthread.h>
++#include <support/xunistd.h>
++#include <unistd.h>
++
++/* Starts out as zero, changed to 1 or 2 by the debugger, depending on
++ the thread. */
++__thread volatile int altered_by_debugger;
++
++/* Writes the GDB script to run the test to PATH. */
++static void
++write_gdbscript (const char *path, int tested_pid)
++{
++ FILE *fp = xfopen (path, "w");
++ fprintf (fp,
++ "set trace-commands on\n"
++ "set debug libthread-db 1\n"
++#if DO_ADD_SYMBOL_FILE
++ /* Do not do this unconditionally to work around a GDB
++ assertion failure: ../../gdb/symtab.c:6404:
++ internal-error: CORE_ADDR get_msymbol_address(objfile*,
++ const minimal_symbol*): Assertion `(objf->flags &
++ OBJF_MAINLINE) == 0' failed. */
++ "add-symbol-file %1$s/nptl/tst-pthread-gdb-attach\n"
++#endif
++ "set auto-load safe-path %1$s/nptl_db\n"
++ "set libthread-db-search-path %1$s/nptl_db\n"
++ "attach %2$d\n",
++ support_objdir_root, tested_pid);
++ fputs ("break debugger_inspection_point\n"
++ "continue\n"
++ "thread 1\n"
++ "print altered_by_debugger\n"
++ "print altered_by_debugger = 1\n"
++ "thread 2\n"
++ "print altered_by_debugger\n"
++ "print altered_by_debugger = 2\n"
++ "continue\n",
++ fp);
++ xfclose (fp);
++}
++
++/* The test sets a breakpoint on this function and alters the
++ altered_by_debugger thread-local variable. */
++void __attribute__ ((weak))
++debugger_inspection_point (void)
++{
++}
++
++/* Thread function for the test thread in the subprocess. */
++static void *
++subprocess_thread (void *closure)
++{
++ /* Wait until altered_by_debugger changes the value away from 0. */
++ while (altered_by_debugger == 0)
++ {
++ usleep (100 * 1000);
++ debugger_inspection_point ();
++ }
++
++ TEST_COMPARE (altered_by_debugger, 2);
++ return NULL;
++}
++
++/* This function implements the subprocess under test. It creates a
++ second thread, waiting for its value to change to 2, and checks
++ that the main thread also changed its value to 1. */
++static void
++in_subprocess (void)
++{
++ pthread_t thr = xpthread_create (NULL, subprocess_thread, NULL);
++ TEST_VERIFY (xpthread_join (thr) == NULL);
++ TEST_COMPARE (altered_by_debugger, 1);
++ _exit (0);
++}
++
++static int
++do_test (void)
++{
++ pid_t tested_pid = xfork ();
++ if (tested_pid == 0)
++ in_subprocess ();
++ char *tested_pid_string = xasprintf ("%d", tested_pid);
++
++ char *gdbscript;
++ xclose (create_temp_file ("tst-pthread-gdb-attach-", &gdbscript));
++ write_gdbscript (gdbscript, tested_pid);
++
++ pid_t gdb_pid = xfork ();
++ if (gdb_pid == 0)
++ {
++ clearenv ();
++ xdup2 (STDOUT_FILENO, STDERR_FILENO);
++ execlp ("gdb", "gdb", "-nx", "-batch", "-x", gdbscript, NULL);
++ if (errno == ENOENT)
++ _exit (EXIT_UNSUPPORTED);
++ else
++ _exit (1);
++ }
++
++ int status;
++ TEST_COMPARE (xwaitpid (gdb_pid, &status, 0), gdb_pid);
++ if (WIFEXITED (status) && WEXITSTATUS (status) == EXIT_UNSUPPORTED)
++ /* gdb is not installed. */
++ return EXIT_UNSUPPORTED;
++ TEST_COMPARE (status, 0);
++ TEST_COMPARE (xwaitpid (tested_pid, &status, 0), tested_pid);
++ TEST_COMPARE (status, 0);
++
++ free (tested_pid_string);
++ free (gdbscript);
++ return 0;
++}
++
++#include <support/test-driver.c>
+diff --git a/nptl_db/structs.def b/nptl_db/structs.def
+index 999a9fc35a..8a613dd2f5 100644
+--- a/nptl_db/structs.def
++++ b/nptl_db/structs.def
+@@ -100,8 +100,7 @@ DB_STRUCT_FIELD (pthread, dtvp)
+ #endif
+
+ #if !(IS_IN (libpthread) && !defined SHARED)
+-DB_STRUCT (rtld_global)
+-DB_RTLD_VARIABLE (_rtld_global)
++DB_VARIABLE (__nptl_rtld_global)
+ #endif
+ DB_RTLD_GLOBAL_FIELD (dl_tls_dtv_slotinfo_list)
+ DB_RTLD_GLOBAL_FIELD (dl_stack_user)
+diff --git a/nptl_db/td_init.c b/nptl_db/td_init.c
+index 1d15681228..06b5adc5c2 100644
+--- a/nptl_db/td_init.c
++++ b/nptl_db/td_init.c
+@@ -33,13 +33,14 @@ td_init (void)
+ bool
+ __td_ta_rtld_global (td_thragent_t *ta)
+ {
+- if (ta->ta_addr__rtld_global == 0
+- && td_mod_lookup (ta->ph, LD_SO, SYM__rtld_global,
+- &ta->ta_addr__rtld_global) != PS_OK)
++ if (ta->ta_addr__rtld_global == 0)
+ {
+- ta->ta_addr__rtld_global = (void*)-1;
+- return false;
++ psaddr_t rtldglobalp;
++ if (DB_GET_VALUE (rtldglobalp, ta, __nptl_rtld_global, 0) == TD_OK)
++ ta->ta_addr__rtld_global = rtldglobalp;
++ else
++ ta->ta_addr__rtld_global = (void *) -1;
+ }
+- else
+- return ta->ta_addr__rtld_global != (void*)-1;
++
++ return ta->ta_addr__rtld_global != (void *)-1;
+ }
+diff --git a/nptl_db/thread_dbP.h b/nptl_db/thread_dbP.h
+index 580a70c471..712fa3aeb6 100644
+--- a/nptl_db/thread_dbP.h
++++ b/nptl_db/thread_dbP.h
+@@ -108,6 +108,8 @@ struct td_thragent
+ # undef DB_SYMBOL
+ # undef DB_VARIABLE
+
++ psaddr_t ta_addr__rtld_global;
++
+ /* The method of locating a thread's th_unique value. */
+ enum
+ {
+--
+2.31.1
+
Added: 0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch
===================================================================
--- 0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch (rev 0)
+++ 0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch 2021-05-12 12:29:39 UTC (rev 415028)
@@ -0,0 +1,135 @@
+From f553dc066071a4465321fbc122bed8a75afd996b Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer at redhat.com>
+Date: Thu, 22 Apr 2021 11:07:43 +0200
+Subject: [PATCH 405/576] nptl: Check for compatible GDB in
+ nptl/tst-pthread-gdb-attach
+
+Also do not clear the subprocess environment, in case running
+GDB needs certain environment variables.
+---
+ nptl/tst-pthread-gdb-attach.c | 78 ++++++++++++++++++++++++++++++++++-
+ 1 file changed, 76 insertions(+), 2 deletions(-)
+
+diff --git a/nptl/tst-pthread-gdb-attach.c b/nptl/tst-pthread-gdb-attach.c
+index 0603ad844d..901a120034 100644
+--- a/nptl/tst-pthread-gdb-attach.c
++++ b/nptl/tst-pthread-gdb-attach.c
+@@ -20,8 +20,12 @@
+ whether libthread_db can be loaded, and that access to thread-local
+ variables works. */
+
++#include <elf.h>
+ #include <errno.h>
++#include <fcntl.h>
++#include <stdbool.h>
+ #include <stdlib.h>
++#include <string.h>
+ #include <support/check.h>
+ #include <support/support.h>
+ #include <support/temp_file.h>
+@@ -35,6 +39,49 @@
+ the thread. */
+ __thread volatile int altered_by_debugger;
+
++/* Common prefix between 32-bit and 64-bit ELF. */
++struct elf_prefix
++{
++ unsigned char e_ident[EI_NIDENT];
++ uint16_t e_type;
++ uint16_t e_machine;
++ uint32_t e_version;
++};
++_Static_assert (sizeof (struct elf_prefix) == EI_NIDENT + 8,
++ "padding in struct elf_prefix");
++
++/* Reads the ELF header from PATH. Returns true if the header can be
++ read, false if the file is too short. */
++static bool
++read_elf_header (const char *path, struct elf_prefix *elf)
++{
++ int fd = xopen (path, O_RDONLY, 0);
++ bool result = read (fd, elf, sizeof (*elf)) == sizeof (*elf);
++ xclose (fd);
++ return result;
++}
++
++/* Searches for "gdb" alongside the path variable. See execvpe. */
++static char *
++find_gdb (void)
++{
++ const char *path = getenv ("PATH");
++ if (path == NULL)
++ return NULL;
++ while (true)
++ {
++ const char *colon = strchrnul (path, ':');
++ char *candidate = xasprintf ("%.*s/gdb", (int) (colon - path), path);
++ if (access (candidate, X_OK) == 0)
++ return candidate;
++ free (candidate);
++ if (*colon == '\0')
++ break;
++ path = colon + 1;
++ }
++ return NULL;
++}
++
+ /* Writes the GDB script to run the test to PATH. */
+ static void
+ write_gdbscript (const char *path, int tested_pid)
+@@ -105,6 +152,33 @@ in_subprocess (void)
+ static int
+ do_test (void)
+ {
++ char *gdb_path = find_gdb ();
++ if (gdb_path == NULL)
++ FAIL_UNSUPPORTED ("gdb command not found in PATH: %s", getenv ("PATH"));
++
++ /* Check that libthread_db is compatible with the gdb architecture
++ because gdb loads it via dlopen. */
++ {
++ char *threaddb_path = xasprintf ("%s/nptl_db/libthread_db.so",
++ support_objdir_root);
++ struct elf_prefix elf_threaddb;
++ TEST_VERIFY_EXIT (read_elf_header (threaddb_path, &elf_threaddb));
++ struct elf_prefix elf_gdb;
++ /* If the ELF header cannot be read or "gdb" is not an ELF file,
++ assume this is a wrapper script that can run. */
++ if (read_elf_header (gdb_path, &elf_gdb)
++ && memcmp (&elf_gdb, ELFMAG, SELFMAG) == 0)
++ {
++ if (elf_gdb.e_ident[EI_CLASS] != elf_threaddb.e_ident[EI_CLASS])
++ FAIL_UNSUPPORTED ("GDB at %s has wrong class", gdb_path);
++ if (elf_gdb.e_ident[EI_DATA] != elf_threaddb.e_ident[EI_DATA])
++ FAIL_UNSUPPORTED ("GDB at %s has wrong data", gdb_path);
++ if (elf_gdb.e_machine != elf_threaddb.e_machine)
++ FAIL_UNSUPPORTED ("GDB at %s has wrong machine", gdb_path);
++ }
++ free (threaddb_path);
++ }
++
+ pid_t tested_pid = xfork ();
+ if (tested_pid == 0)
+ in_subprocess ();
+@@ -117,9 +191,8 @@ do_test (void)
+ pid_t gdb_pid = xfork ();
+ if (gdb_pid == 0)
+ {
+- clearenv ();
+ xdup2 (STDOUT_FILENO, STDERR_FILENO);
+- execlp ("gdb", "gdb", "-nx", "-batch", "-x", gdbscript, NULL);
++ execl (gdb_path, "gdb", "-nx", "-batch", "-x", gdbscript, NULL);
+ if (errno == ENOENT)
+ _exit (EXIT_UNSUPPORTED);
+ else
+@@ -137,6 +210,7 @@ do_test (void)
+
+ free (tested_pid_string);
+ free (gdbscript);
++ free (gdb_path);
+ return 0;
+ }
+
+--
+2.31.1
+
Added: 0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch
===================================================================
--- 0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch (rev 0)
+++ 0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch 2021-05-12 12:29:39 UTC (rev 415028)
@@ -0,0 +1,26 @@
+From 6f3e54d404cfe1ba7d1444e6dfcfd77b102d9287 Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer at redhat.com>
+Date: Thu, 22 Apr 2021 19:53:15 +0200
+Subject: [PATCH 409/576] nptl: Do not build nptl/tst-pthread-gdb-attach as PIE
+
+---
+ nptl/Makefile | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/nptl/Makefile b/nptl/Makefile
+index a3d1ef8d66..294bb2faa4 100644
+--- a/nptl/Makefile
++++ b/nptl/Makefile
+@@ -377,6 +377,9 @@ endif
+ CFLAGS-tst-pthread-gdb-attach-static.c := $(CFLAGS-printers-tests)
+ CPPFLAGS-tst-pthread-gdb-attach-static.c := \
+ $(CFLAGS-printers-tests) -DDO_ADD_SYMBOL_FILE=0
++# As of version 9.2, GDB cannot attach properly to PIE programs that
++# were launched with an explicit ld.so invocation.
++tst-pthread-gdb-attach-no-pie = yes
+
+ ifeq ($(build-shared),yes)
+ tests-printers-libs := $(shared-thread-library)
+--
+2.31.1
+
Modified: PKGBUILD
===================================================================
--- PKGBUILD 2021-05-12 12:28:46 UTC (rev 415027)
+++ PKGBUILD 2021-05-12 12:29:39 UTC (rev 415028)
@@ -7,7 +7,7 @@
pkgbase=glibc
pkgname=(glibc lib32-glibc)
pkgver=2.33
-pkgrel=4
+pkgrel=5
arch=(x86_64)
url='https://www.gnu.org/software/libc'
license=(GPL LGPL)
@@ -21,7 +21,10 @@
locale-gen
lib32-glibc.conf
sdt.h sdt-config.h
- bz27343.patch)
+ bz27343.patch
+ 0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
+ 0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch
+ 0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch)
validpgpkeys=(7273542B39962DF7B299931416792B4EA25340F8 # Carlos O'Donell
BC7C7372637EC10C57D7AA6579C43DFBF1CF2187) # Siddhesh Poyarekar
md5sums=('390bbd889c7e8e8a7041564cb6b27cca'
@@ -31,7 +34,10 @@
'6e052f1cb693d5d3203f50f9d4e8c33b'
'91fec3b7e75510ae2ac42533aa2e695e'
'680df504c683640b02ed4a805797c0b2'
- 'cfe57018d06bf748b8ca1779980fef33')
+ 'cfe57018d06bf748b8ca1779980fef33'
+ '78f041fc66fee4ee372f13b00a99ff72'
+ '9e418efa189c20053e887398df2253cf'
+ '7a09f1693613897add1791e7aead19c9')
prepare() {
mkdir -p glibc-build lib32-glibc-build
@@ -41,6 +47,15 @@
# commit c3479fb7939898ec22c655c383454d6e8b982a67
patch -p1 -i "$srcdir"/bz27343.patch
+
+ # nptl_db: Support different libpthread/ld.so load orders (bug 27744)
+ patch -p1 -i "$srcdir"/0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
+
+ # nptl: Check for compatible GDB in nptl/tst-pthread-gdb-attach
+ patch -p1 -i "$srcdir"/0002-nptl-Check-for-compatible-GDB-in-nptl-tst-pthread-gd.patch
+
+ # nptl: Do not build nptl/tst-pthread-gdb-attach as PIE
+ patch -p1 -i "$srcdir"/0003-nptl-Do-not-build-nptl-tst-pthread-gdb-attach-as-PIE.patch
}
build() {
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