{"id":2233153,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2233153/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/patch/20260505190809.3898686-3-adhemerval.zanella@linaro.org/","project":{"id":41,"url":"http://patchwork.ozlabs.org/api/1.2/projects/41/?format=json","name":"GNU C Library","link_name":"glibc","list_id":"libc-alpha.sourceware.org","list_email":"libc-alpha@sourceware.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260505190809.3898686-3-adhemerval.zanella@linaro.org>","list_archive_url":null,"date":"2026-05-05T19:06:51","name":"[v2,2/3] nptl: Do not always assume set_robust_list availability (BZ 33225)","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"7c7b2af9071b99a744795f34d9570fb4691c1d5f","submitter":{"id":66065,"url":"http://patchwork.ozlabs.org/api/1.2/people/66065/?format=json","name":"Adhemerval Zanella Netto","email":"adhemerval.zanella@linaro.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/glibc/patch/20260505190809.3898686-3-adhemerval.zanella@linaro.org/mbox/","series":[{"id":502884,"url":"http://patchwork.ozlabs.org/api/1.2/series/502884/?format=json","web_url":"http://patchwork.ozlabs.org/project/glibc/list/?series=502884","date":"2026-05-05T19:06:49","name":"nptl: Fix robust mutex support detection and defer robust list initialization","version":2,"mbox":"http://patchwork.ozlabs.org/series/502884/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2233153/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2233153/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=UNw46paz;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=38.145.34.32; helo=vm01.sourceware.org;\n envelope-from=libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (2048-bit key,\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=UNw46paz","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=linaro.org","sourceware.org; spf=pass smtp.mailfrom=linaro.org","server2.sourceware.org;\n arc=none smtp.remote-ip=2607:f8b0:4864:20::936"],"Received":["from vm01.sourceware.org (vm01.sourceware.org [38.145.34.32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g97NT15k5z1yJx\n\tfor ; Wed, 06 May 2026 05:09:13 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 2732C4BA799C\n\tfor ; Tue, 5 May 2026 19:09:11 +0000 (GMT)","from mail-ua1-x936.google.com (mail-ua1-x936.google.com\n [IPv6:2607:f8b0:4864:20::936])\n by sourceware.org (Postfix) with ESMTPS id 852514BA799E\n for ; Tue, 5 May 2026 19:08:23 +0000 (GMT)","by mail-ua1-x936.google.com with SMTP id\n a1e0cc1a2514c-95695190911so1326245241.2\n for ; Tue, 05 May 2026 12:08:23 -0700 (PDT)","from mandiga.. 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Therefore, for the default case\n(__ASSUME_SET_ROBUST_LIST being true), the missing support is not\ndetected, and pthread_mutex_init succeeds where it should fail. For\ninstance, the sequence succeeds on qemu-user even when set_robust_list\nfails with ENOSYS.\n\n pthread_mutexattr_init(&attr);\n pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);\n pthread_mutexattr_setrobust(&attr, PTHREAD_MUTEX_ROBUST);\n\n pthread_mutex_init(&mutex, &attr);\n\nThis patch removes __ASSUME_SET_ROBUST_LIST and always enables\n__nptl_set_robust_list_avail detection.\n\nChecked on x86_64-linux-gnu.\n\nReported-by: Daniel Henrique Barboza \n---\n nptl/pthread_create.c | 4 ----\n nptl/pthread_mutex_init.c | 3 ---\n nptl/tst-mutexpi10.c | 4 +++-\n nptl/tst-robust-fork.c | 21 +++++++++++++++++++\n sysdeps/nptl/dl-tls_init_tp.c | 8 +------\n sysdeps/nptl/pthreadP.h | 2 --\n sysdeps/pthread/tst-robust7.c | 1 -\n sysdeps/pthread/tst-robust8.c | 6 ++++++\n sysdeps/pthread/tst-robust9.c | 1 -\n sysdeps/unix/sysv/linux/arm/kernel-features.h | 7 -------\n .../unix/sysv/linux/hppa/kernel-features.h | 3 ---\n sysdeps/unix/sysv/linux/kernel-features.h | 5 -----\n .../unix/sysv/linux/m68k/kernel-features.h | 5 -----\n .../unix/sysv/linux/mips/kernel-features.h | 6 ------\n .../unix/sysv/linux/riscv/kernel-features.h | 5 -----\n .../unix/sysv/linux/sparc/kernel-features.h | 6 ------\n 16 files changed, 31 insertions(+), 56 deletions(-)","diff":"diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c\nindex 9a0cefb0f5a..72f77d1914e 100644\n--- a/nptl/pthread_create.c\n+++ b/nptl/pthread_create.c\n@@ -386,9 +386,7 @@ start_thread (void *arg)\n __libc_fatal (\"Fatal glibc error: rseq registration failed\\n\");\n }\n \n-#ifndef __ASSUME_SET_ROBUST_LIST\n if (__nptl_set_robust_list_avail)\n-#endif\n {\n /* This call should never fail because the initial call in init.c\n \t succeeded. */\n@@ -536,7 +534,6 @@ start_thread (void *arg)\n pd->exiting = true;\n __libc_lock_unlock (pd->exit_lock);\n \n-#ifndef __ASSUME_SET_ROBUST_LIST\n /* If this thread has any robust mutexes locked, handle them now. */\n # if __PTHREAD_MUTEX_HAVE_PREV\n void *robust = pd->robust_head.list;\n@@ -567,7 +564,6 @@ start_thread (void *arg)\n \t}\n while (robust != (void *) &pd->robust_head);\n }\n-#endif\n \n /* Release the vDSO getrandom per-thread buffer with all signal blocked,\n to avoid creating a new free-state block during thread release. */\ndiff --git a/nptl/pthread_mutex_init.c b/nptl/pthread_mutex_init.c\nindex 8a5450bcb08..9be08332f1f 100644\n--- a/nptl/pthread_mutex_init.c\n+++ b/nptl/pthread_mutex_init.c\n@@ -93,12 +93,9 @@ ___pthread_mutex_init (pthread_mutex_t *mutex,\n \n if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0)\n {\n-#ifndef __ASSUME_SET_ROBUST_LIST\n if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_PSHARED) != 0\n \t && !__nptl_set_robust_list_avail)\n \treturn ENOTSUP;\n-#endif\n-\n mutex_kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP;\n }\n \ndiff --git a/nptl/tst-mutexpi10.c b/nptl/tst-mutexpi10.c\nindex 3978fb25fdf..379627e4b02 100644\n--- a/nptl/tst-mutexpi10.c\n+++ b/nptl/tst-mutexpi10.c\n@@ -58,7 +58,9 @@ do_test (void)\n \t xpthread_mutexattr_setrobust (&attr, robust[r]);\n \n \t pthread_mutex_t mtx;\n-\t xpthread_mutex_init (&mtx, &attr);\n+\t if (pthread_mutex_init (&mtx, &attr) == ENOTSUP\n+\t && robust[r] == PTHREAD_MUTEX_ROBUST)\n+\t continue;\n \n \t /* Uncontended case does not trigger any futex call. */\n \t struct timespec tmo = timespec_add (xclock_now (clocks[c].clk),\ndiff --git a/nptl/tst-robust-fork.c b/nptl/tst-robust-fork.c\nindex be9c6d3cc41..80d76f96c14 100644\n--- a/nptl/tst-robust-fork.c\n+++ b/nptl/tst-robust-fork.c\n@@ -159,9 +159,20 @@ one_test (int parent_bits, int child_bits, int nonshared_bits,\n xmunmap (shared, sizeof (*shared));\n }\n \n+static inline bool\n+is_robust_pshared (int bits)\n+{\n+ return (bits & (mutex_robust | mutex_pshared))\n+ == (mutex_robust | mutex_pshared);\n+}\n+\n static int\n do_test (void)\n {\n+ bool robust_support = support_process_shared_robust_mutex ();\n+ if (test_verbose)\n+ printf (\"info: robust_support=%d\\n\", robust_support);\n+\n for (int parent_bits = 0; parent_bits <= mutex_all_bits; ++parent_bits)\n for (int child_bits = 0; child_bits <= mutex_all_bits; ++child_bits)\n for (int nonshared_bits = 0; nonshared_bits <= mutex_all_bits;\n@@ -175,6 +186,16 @@ do_test (void)\n parent_bits, child_bits, nonshared_bits,\n lock_nonshared ? \" lock_nonshared\" : \"\",\n lock_child ? \" lock_child\" : \"\");\n+\t if ((is_robust_pshared (parent_bits)\n+\t\t || is_robust_pshared (child_bits)\n+\t\t || is_robust_pshared (nonshared_bits))\n+\t\t && !robust_support)\n+\t\t{\n+\t\t if (test_verbose)\n+\t\t printf (\"info: skipping tests due missing robust mutex\"\n+\t\t\t \" support\\n\");\n+\t\t continue;\n+\t\t}\n one_test (parent_bits, child_bits, nonshared_bits,\n lock_nonshared, lock_child);\n }\ndiff --git a/sysdeps/nptl/dl-tls_init_tp.c b/sysdeps/nptl/dl-tls_init_tp.c\nindex 72cc4087c91..75e3712a6d8 100644\n--- a/sysdeps/nptl/dl-tls_init_tp.c\n+++ b/sysdeps/nptl/dl-tls_init_tp.c\n@@ -28,10 +28,8 @@\n #define TUNABLE_NAMESPACE pthread\n #include \n \n-#ifndef __ASSUME_SET_ROBUST_LIST\n bool __nptl_set_robust_list_avail;\n rtld_hidden_data_def (__nptl_set_robust_list_avail)\n-#endif\n \n bool __nptl_initial_report_events;\n rtld_hidden_def (__nptl_initial_report_events)\n@@ -95,11 +93,7 @@ __tls_init_tp (void)\n int res = INTERNAL_SYSCALL_CALL (set_robust_list, &pd->robust_head,\n sizeof (struct robust_list_head));\n if (!INTERNAL_SYSCALL_ERROR_P (res))\n- {\n-#ifndef __ASSUME_SET_ROBUST_LIST\n- __nptl_set_robust_list_avail = true;\n-#endif\n- }\n+ __nptl_set_robust_list_avail = true;\n }\n \n {\ndiff --git a/sysdeps/nptl/pthreadP.h b/sysdeps/nptl/pthreadP.h\nindex de432d40324..c62c8982905 100644\n--- a/sysdeps/nptl/pthreadP.h\n+++ b/sysdeps/nptl/pthreadP.h\n@@ -192,12 +192,10 @@ libc_hidden_proto (__pthread_keys)\n extern unsigned int __nptl_nthreads;\n libc_hidden_proto (__nptl_nthreads)\n \n-#ifndef __ASSUME_SET_ROBUST_LIST\n /* True if the set_robust_list system call works. Initialized in\n __tls_init_tp. */\n extern bool __nptl_set_robust_list_avail;\n rtld_hidden_proto (__nptl_set_robust_list_avail)\n-#endif\n \n /* Thread Priority Protection. */\n extern int __sched_fifo_min_prio;\ndiff --git a/sysdeps/pthread/tst-robust7.c b/sysdeps/pthread/tst-robust7.c\nindex d062d3d6582..a2567d7fe08 100644\n--- a/sysdeps/pthread/tst-robust7.c\n+++ b/sysdeps/pthread/tst-robust7.c\n@@ -21,7 +21,6 @@\n #include \n #include \n \n-\n static pthread_barrier_t b;\n static pthread_cond_t c = PTHREAD_COND_INITIALIZER;\n static pthread_mutex_t m;\ndiff --git a/sysdeps/pthread/tst-robust8.c b/sysdeps/pthread/tst-robust8.c\nindex 65f37feddfa..3b3ca161905 100644\n--- a/sysdeps/pthread/tst-robust8.c\n+++ b/sysdeps/pthread/tst-robust8.c\n@@ -10,6 +10,8 @@\n \n #include \n \n+#include \n+#include \n \n \n static void prepare (void);\n@@ -143,6 +145,10 @@ child (int round)\n static int\n do_test (void)\n {\n+ /* Process shared robust mutexes requires kernel support. */\n+ if (!support_process_shared_robust_mutex ())\n+ FAIL_UNSUPPORTED (\"process-shared robust mutexes not supported\");\n+\n if (ftruncate (fd, N * sizeof (pthread_mutex_t)) != 0)\n {\n puts (\"cannot size new file\");\ndiff --git a/sysdeps/pthread/tst-robust9.c b/sysdeps/pthread/tst-robust9.c\nindex ca24f24282f..99b6abbc86b 100644\n--- a/sysdeps/pthread/tst-robust9.c\n+++ b/sysdeps/pthread/tst-robust9.c\n@@ -5,7 +5,6 @@\n #include \n #include \n \n-\n static pthread_mutex_t m;\n \n static void *\ndiff --git a/sysdeps/unix/sysv/linux/arm/kernel-features.h b/sysdeps/unix/sysv/linux/arm/kernel-features.h\nindex d169bf58946..1511de1c843 100644\n--- a/sysdeps/unix/sysv/linux/arm/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/arm/kernel-features.h\n@@ -20,13 +20,6 @@\n #include \n #include_next \n \n-/* The ARM kernel before 3.14.3 may or may not support\n- futex_atomic_cmpxchg_inatomic, depending on kernel\n- configuration. */\n-#if __LINUX_KERNEL_VERSION < 0x030E03\n-# undef __ASSUME_SET_ROBUST_LIST\n-#endif\n-\n /* ARM fadvise64_64 reorganize the syscall arguments. */\n #define __ASSUME_FADVISE64_64_6ARG\t1\n \ndiff --git a/sysdeps/unix/sysv/linux/hppa/kernel-features.h b/sysdeps/unix/sysv/linux/hppa/kernel-features.h\nindex 1b46336e4a0..45ef64bb1f9 100644\n--- a/sysdeps/unix/sysv/linux/hppa/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/hppa/kernel-features.h\n@@ -30,6 +30,3 @@\n \n #undef __ASSUME_CLONE_DEFAULT\n #define __ASSUME_CLONE_BACKWARDS 1\n-\n-/* QEMU does not support set_robust_list. */\n-#undef __ASSUME_SET_ROBUST_LIST\ndiff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h\nindex 85f6e888dba..33f3c2d2c58 100644\n--- a/sysdeps/unix/sysv/linux/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/kernel-features.h\n@@ -49,11 +49,6 @@\n SH this appeared first in 2.6.19-rc1. */\n #define __ASSUME_PSELECT\t1\n \n-/* Support for inter-process robust mutexes was added in 2.6.17 (but\n- some architectures lack futex_atomic_cmpxchg_inatomic in some\n- configurations). */\n-#define __ASSUME_SET_ROBUST_LIST\t1\n-\n /* The termios2 interface was introduced across all architectures except\n Alpha in kernel 2.6.22. */\n #define __ASSUME_TERMIOS2\t1\ndiff --git a/sysdeps/unix/sysv/linux/m68k/kernel-features.h b/sysdeps/unix/sysv/linux/m68k/kernel-features.h\nindex d66fe16fa8d..db90d8a8c07 100644\n--- a/sysdeps/unix/sysv/linux/m68k/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/m68k/kernel-features.h\n@@ -42,11 +42,6 @@\n # undef __ASSUME_GETPEERNAME_SYSCALL\n #endif\n \n-/* No support for PI futexes or robust mutexes before 3.10 for m68k. */\n-#if __LINUX_KERNEL_VERSION < 0x030a00\n-# undef __ASSUME_SET_ROBUST_LIST\n-#endif\n-\n /* m68k only supports ipc syscall before 5.1. */\n #if __LINUX_KERNEL_VERSION < 0x050100\n # undef __ASSUME_DIRECT_SYSVIPC_SYSCALLS\ndiff --git a/sysdeps/unix/sysv/linux/mips/kernel-features.h b/sysdeps/unix/sysv/linux/mips/kernel-features.h\nindex 7790f0d14b5..0d30d4d8284 100644\n--- a/sysdeps/unix/sysv/linux/mips/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/mips/kernel-features.h\n@@ -21,12 +21,6 @@\n \n #include_next \n \n-/* The MIPS kernel does not support futex_atomic_cmpxchg_inatomic if\n- emulating LL/SC. */\n-#if __mips == 1 || defined _MIPS_ARCH_R5900\n-# undef __ASSUME_SET_ROBUST_LIST\n-#endif\n-\n /* Define this if your 32-bit syscall API requires 64-bit register\n pairs to start with an even-number register. */\n #if _MIPS_SIM == _ABIO32\ndiff --git a/sysdeps/unix/sysv/linux/riscv/kernel-features.h b/sysdeps/unix/sysv/linux/riscv/kernel-features.h\nindex 32087c0602c..9172373e989 100644\n--- a/sysdeps/unix/sysv/linux/riscv/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/riscv/kernel-features.h\n@@ -21,8 +21,3 @@\n \n #undef __ASSUME_CLONE_DEFAULT\n #define __ASSUME_CLONE_BACKWARDS 1\n-\n-/* No support for PI mutexes or robust futexes before 4.20. */\n-#if __LINUX_KERNEL_VERSION < 0x041400\n-# undef __ASSUME_SET_ROBUST_LIST\n-#endif\ndiff --git a/sysdeps/unix/sysv/linux/sparc/kernel-features.h b/sysdeps/unix/sysv/linux/sparc/kernel-features.h\nindex eb293411135..dad512cec35 100644\n--- a/sysdeps/unix/sysv/linux/sparc/kernel-features.h\n+++ b/sysdeps/unix/sysv/linux/sparc/kernel-features.h\n@@ -19,12 +19,6 @@\n \n #include_next \n \n-/* 32-bit SPARC kernels do not support\n- futex_atomic_cmpxchg_inatomic. */\n-#if !defined __arch64__ && !defined __sparc_v9__\n-# undef __ASSUME_SET_ROBUST_LIST\n-#endif\n-\n /* These syscalls were added for 32-bit in 4.4 (but present for 64-bit\n in all supported kernel versions); the architecture-independent\n kernel-features.h assumes some of them to be present by default.\n","prefixes":["v2","2/3"]}