[{"id":3679986,"web_url":"http://patchwork.ozlabs.org/comment/3679986/","msgid":"<20260421170646.3943-1-linuxtestproject.agent@gmail.com>","list_archive_url":null,"date":"2026-04-21T17:06:46","subject":"Re: [LTP] Make userfaultfd0{1, 3, 4} LTP tests valgrind compatible","submitter":{"id":93132,"url":"http://patchwork.ozlabs.org/api/people/93132/","name":null,"email":"linuxtestproject.agent@gmail.com"},"content":"Hi Martin,\n\nOn Tue, 21 Apr 2026, Martin Cermak wrote:\n> Make userfaultfd0{1, 3, 4} LTP tests valgrind compatible\n\nThe commit message is missing a Signed-off-by: tag.\n\n> -static void *handle_thread(void)\n> +static void *pagefault_handler(void)\n\nSince this is no longer a thread entry point, change the return type to\nvoid and drop the return NULL.\n\n> /*\\\n> * Force a pagefault event and handle it using :manpage:`userfaultfd(2)`\n> * from a different thread.\n> */\n\nThe handler now runs in a forked child, not a thread. Update the doc\ncomment in all three files.\n\n[...]\n\n> +\tpid = SAFE_FORK();\n> +\t\tif (pid == 0) {\n> +\t\tpagefault_handler();\n\nuserfaultfd03.c: extra leading tab on the `if` line.\n\n[...]\n\n> +\tSAFE_WAITPID(pid, NULL, 0);\n> \treset_pages();\n\nIn the original code the thread closed uffd for the whole process (threads\nshare the fd table). With fork, the child closes only its own copy; the\nparent's uffd is never closed. Add SAFE_CLOSE(uffd) before reset_pages()\nin all three tests.\n\nAlso, tst_safe_pthread.h is no longer used in userfaultfd03.c and\nuserfaultfd04.c after this change; remove the include.\n\n---\nNote:\n\nOur agent completed the review of the patch.\n\nThe agent can sometimes produce false positives although often its\nfindings are genuine. If you find issues with the review, please\ncomment this email or ignore the suggestions.\n\nRegards,\nLTP AI Reviewer","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=kIYr0D3u;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; helo=picard.linux.it;\n envelope-from=ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it;\n receiver=patchwork.ozlabs.org)"],"Received":["from picard.linux.it (picard.linux.it [213.254.12.146])\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 4g0TKq5j4tz1yGs\n\tfor ; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3680228,"web_url":"http://patchwork.ozlabs.org/comment/3680228/","msgid":"<20260422053712.GB392764@pevik>","list_archive_url":null,"date":"2026-04-22T05:37:12","subject":"Re: [LTP] [Valgrind-developers] [PATCH] Make userfaultfd0{1, 3,\n 4} LTP tests valgrind compatible","submitter":{"id":70792,"url":"http://patchwork.ozlabs.org/api/people/70792/","name":"Petr Vorel","email":"pvorel@suse.cz"},"content":"Hi Martin,\n\n[ Cc Ricardo ]\n\n> Historically a page fault is handled in the linux kernel. The\n> userfaultfd mechanism [1] was introduced in Linux 4.3 (2015) to allow\n> custom handling page faults in userspace. It allows for custom page\n> fault handling strategies such as lazy loading, live migration of qemu\n> VMs, etc. With userfaultfd, kernel communicates with userspace via a\n> file descriptor (userfaultfd). Userfaultfd LTP tests cover this.\n\n> These tests set up a main thread and a page fault handler thread. Once\n> a page fault happens in the main thread, kernel stops it, and let's the\n> handler take care of the page fault.\n\n> This is a problem for Valgrind, because it serializes the threads\n> execution (using one \"big mutex\", VG_(acquire_BigLock)). Once kernel\n> stops the main thread, under valgrind, the handler thread doesn't have\n> a chance to handle the page fault. Valgrind stalls till the timeout\n> (adjustable via LTP_TIMEOUT_MUL ;)\n\n> However, some of the testcases can be easily changed to use forked\n> processes instead of threads. That's what this patch does. When\n> client program forks, Valgrind forks too, and that allows for the needed\n> parallelism to handle the page fault.\n\nYou understand process vs. threads more than me. But shouldn't mmap() use\nMAP_SHARED instead of MAP_PRIVATE for those which aren't using /dev/userfaultfd?\n\n> This redesign can't be easily done with some of the tests, such as e.g.\n> userfaultfd02 where both the main thread and the handler thread need to\n> share the address space. That could be done via clone() and is proven\n\nWhat is the difference with userfaultfd02 then?\n\n> to work. But unfortunately there is another Valgrind limitation in clone\n> flags it supports, so this also isn't a practical way to go.\n\n> That said, this update tweaks userfaultfd01, userfaultfd03, and\n> userfaultfd04 in a way that they become \"compatible\" with Valgrind.\n> It's a test coverage improvement.\n\nAlso doc should be updated (mentions thread).\n\nPlease don't forget to add it next time:\nSigned-off-by: Martin Cermak \n\n> [1] https://www.kernel.org/doc/html/latest/admin-guide/mm/userfaultfd.html\n> ---\n> .../kernel/syscalls/userfaultfd/userfaultfd01.c | 13 +++++++++----\n> .../kernel/syscalls/userfaultfd/userfaultfd03.c | 15 ++++++++++-----\n> .../kernel/syscalls/userfaultfd/userfaultfd04.c | 13 +++++++++----\n> 3 files changed, 28 insertions(+), 13 deletions(-)\n\n> diff --git a/testcases/kernel/syscalls/userfaultfd/userfaultfd01.c b/testcases/kernel/syscalls/userfaultfd/userfaultfd01.c\n> index 7368d3863..c927cda95 100644\n> --- a/testcases/kernel/syscalls/userfaultfd/userfaultfd01.c\n> +++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd01.c\n> @@ -57,7 +57,7 @@ static void reset_pages(void)\n> \tSAFE_MUNMAP(copy_page, page_size);\n> }\n\n> -static void *handle_thread(void)\n> +static void *pagefault_handler(void)\n> {\n> \tstatic struct uffd_msg msg;\n> \tstruct uffdio_copy uffdio_copy = {};\n> @@ -91,7 +91,7 @@ static void *handle_thread(void)\n\n> static void run(unsigned int i)\n> {\n> -\tpthread_t thr;\n> +\tpid_t pid;\n> \tstruct uffdio_api uffdio_api = {};\n> \tstruct uffdio_register uffdio_register;\n> \tstruct tcase *tc = &tcases[i];\n> @@ -112,7 +112,11 @@ static void run(unsigned int i)\n\n> \tSAFE_IOCTL(uffd, UFFDIO_REGISTER, &uffdio_register);\n\n> -\tSAFE_PTHREAD_CREATE(&thr, NULL, (void *) handle_thread, NULL);\n> +\tpid = SAFE_FORK();\n> +\tif (pid == 0) {\n> +\t\tpagefault_handler();\n> +\t\t_exit(0);\n> +\t}\n\n> \tchar c = page[0xf];\n\n> @@ -121,7 +125,7 @@ static void run(unsigned int i)\n> \telse\n> \t\ttst_res(TFAIL, \"Pagefault not handled!\");\n\n> -\tSAFE_PTHREAD_JOIN(thr, NULL);\n> +\tSAFE_WAITPID(pid, NULL, 0);\n> \treset_pages();\n> }\n\n> @@ -129,4 +133,5 @@ static struct tst_test test = {\n> \t.setup = setup,\n> \t.test = run,\n> \t.tcnt = ARRAY_SIZE(tcases),\n> +\t.forks_child = 1,\n> };\n> diff --git a/testcases/kernel/syscalls/userfaultfd/userfaultfd03.c b/testcases/kernel/syscalls/userfaultfd/userfaultfd03.c\n> index b65f39eca..f5d3be1ae 100644\n> --- a/testcases/kernel/syscalls/userfaultfd/userfaultfd03.c\n> +++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd03.c\n> @@ -61,7 +61,7 @@ static void reset_pages(void)\n> \tSAFE_MUNMAP(copy_page, page_size);\n> }\n\n> -static void *handle_thread(void)\n> +static void *pagefault_handler(void)\n> {\n> \tstatic struct uffd_msg msg;\n> \tstruct uffdio_copy uffdio_copy = {};\n> @@ -95,7 +95,7 @@ static void *handle_thread(void)\n\n> static void run(void)\n> {\n> -\tpthread_t thr;\n> +\tpid_t pid;\n> \tstruct uffdio_api uffdio_api = {};\n> \tstruct uffdio_register uffdio_register;\n\n> @@ -112,7 +112,11 @@ static void run(void)\n\n> \tSAFE_IOCTL(uffd, UFFDIO_REGISTER, &uffdio_register);\n\n> -\tSAFE_PTHREAD_CREATE(&thr, NULL, (void *) handle_thread, NULL);\n> +\tpid = SAFE_FORK();\n> +\t\tif (pid == 0) {\n> +\t\tpagefault_handler();\n> +\t\t_exit(0);\n> +\t}\n\n> \tchar c = page[0xf];\n\n> @@ -121,7 +125,7 @@ static void run(void)\n> \telse\n> \t\ttst_res(TFAIL, \"Pagefault not handled via /dev/userfaultfd\");\n\n> -\tSAFE_PTHREAD_JOIN(thr, NULL);\n> +\tSAFE_WAITPID(pid, NULL, 0);\n> \treset_pages();\n> }\n\n> @@ -132,5 +136,6 @@ static struct tst_test test = {\n> \t.needs_kconfigs = (const char *[]) {\n> \t\t\"CONFIG_USERFAULTFD=y\",\n> \t\tNULL\n> -\t}\n> +\t},\n> +\t.forks_child = 1,\n> };\n> diff --git a/testcases/kernel/syscalls/userfaultfd/userfaultfd04.c b/testcases/kernel/syscalls/userfaultfd/userfaultfd04.c\n> index 4eb811e45..13883a711 100644\n> --- a/testcases/kernel/syscalls/userfaultfd/userfaultfd04.c\n> +++ b/testcases/kernel/syscalls/userfaultfd/userfaultfd04.c\n> @@ -33,7 +33,7 @@ static void reset_pages(void)\n> \tSAFE_MUNMAP(page, page_size);\n> }\n\n> -static void *handle_thread(void)\n> +static void *pagefault_handler(void)\n> {\n> \tstatic struct uffd_msg msg;\n> \tstruct uffdio_zeropage uffdio_zeropage = {};\n> @@ -64,7 +64,7 @@ static void *handle_thread(void)\n\n> static void run(void)\n> {\n> -\tpthread_t thr;\n> +\tpid_t pid;\n> \tstruct uffdio_api uffdio_api = {};\n> \tstruct uffdio_register uffdio_register;\n\n> @@ -81,7 +81,11 @@ static void run(void)\n\n> \tSAFE_IOCTL(uffd, UFFDIO_REGISTER, &uffdio_register);\n\n> -\tSAFE_PTHREAD_CREATE(&thr, NULL, (void *) handle_thread, NULL);\n> +\tpid = SAFE_FORK();\n> +\tif (pid == 0) {\n> +\t\tpagefault_handler();\n> +\t\t_exit(0);\n> +\t}\n\n> \tfor (int i = 0; i < page_size; i++) {\n> \t\tif (page[i] != 0) {\n> @@ -92,10 +96,11 @@ static void run(void)\n\n> \ttst_res(TPASS, \"Pagefault handled with UFFDIO_ZEROPAGE\");\n\n> -\tSAFE_PTHREAD_JOIN(thr, NULL);\n> +\tSAFE_WAITPID(pid, NULL, 0);\n> \treset_pages();\n> }\n\n> static struct tst_test test = {\n> \t.test_all = run,\n> +\t.forks_child = 1,\n> };","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=213.254.12.146; helo=picard.linux.it;\n envelope-from=ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it;\n receiver=patchwork.ozlabs.org)","smtp-out2.suse.de;\n\tnone"],"Received":["from picard.linux.it (picard.linux.it [213.254.12.146])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g0nzt1nMCz1y2d\n\tfor ; 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Wed, 22 Apr 2026 05:37:22 +0000"],"Date":"Wed, 22 Apr 2026 07:37:12 +0200","From":"Petr Vorel ","To":"Martin Cermak ","Message-ID":"<20260422053712.GB392764@pevik>","References":"<20260421152349.1673057-1-mcermak@redhat.com>","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"<20260421152349.1673057-1-mcermak@redhat.com>","X-Rspamd-Pre-Result":["action=no action; module=replies;\n Message is reply to one we originated","action=no action; module=replies;\n Message is reply to one we originated"],"X-Rspamd-Queue-Id":"792AA5BD47","X-Rspamd-Action":"no action","X-Spam-Score":"-4.00","X-Spam-Level":"","X-Spamd-Result":"default: False [-4.00 / 50.00];\n\tREPLY(-4.00)[]","X-Rspamd-Server":"rspamd1.dmz-prg2.suse.org","X-Spam-Status":"No, score=0.0 required=7.0 tests=SPF_HELO_NONE,SPF_PASS\n shortcircuit=no autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on in-6.smtp.seeweb.it","X-Virus-Scanned":"clamav-milter 1.0.9 at in-6.smtp.seeweb.it","X-Virus-Status":"Clean","Subject":"Re: [LTP] [Valgrind-developers] [PATCH] Make userfaultfd0{1, 3,\n 4} LTP tests valgrind compatible","X-BeenThere":"ltp@lists.linux.it","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"Linux Test Project ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"Petr Vorel ","Cc":"valgrind-developers@lists.sourceforge.net, ltp@lists.linux.it","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3680287,"web_url":"http://patchwork.ozlabs.org/comment/3680287/","msgid":"<319d3965-30f0-49c5-b747-ad16334391e2@suse.de>","list_archive_url":null,"date":"2026-04-22T07:54:34","subject":"Re: [LTP] [Valgrind-developers] [PATCH] Make userfaultfd0{1, 3,\n 4} LTP tests valgrind compatible","submitter":{"id":92484,"url":"http://patchwork.ozlabs.org/api/people/92484/","name":"Ricardo Branco","email":"rbranco@suse.de"},"content":"On 4/22/26 7:37 AM, Petr Vorel wrote:\n>> However, some of the testcases can be easily changed to use forked\n>> processes instead of threads. That's what this patch does. When\n>> client program forks, Valgrind forks too, and that allows for the needed\n>> parallelism to handle the page fault.\n> You understand process vs. threads more than me. But shouldn't mmap() use\n> MAP_SHARED instead of MAP_PRIVATE for those which aren't using /dev/userfaultfd?\n\nThe documentation for userfaultfd mentions threads.  I'm afraid we'll\nlose vital coverage if we move to forked processes.\n\nPerhaps we should cover both?\n\nAlso checkout UFFD_FEATURE_EVENT_FORK and the BUGS section for this in\nuserfaultfd(2).\nI have like 3 patches for userfaultfd that I'm afraid I'd have to rebase \nthen.\\ Best,\nRicardo","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=Rb4jI2cq;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.de\n header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=h0BW85Bq;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa\n header.b=fq7mTtIE;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=Gj4yaEr2;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3680587,"web_url":"http://patchwork.ozlabs.org/comment/3680587/","msgid":"<20260422121742.GA419002@pevik>","list_archive_url":null,"date":"2026-04-22T12:17:42","subject":"Re: [LTP] [Valgrind-developers] [PATCH] Make userfaultfd0{1, 3,\n 4} LTP tests valgrind compatible","submitter":{"id":70792,"url":"http://patchwork.ozlabs.org/api/people/70792/","name":"Petr Vorel","email":"pvorel@suse.cz"},"content":"> On 4/22/26 7:37 AM, Petr Vorel wrote:\n> > > However, some of the testcases can be easily changed to use forked\n> > > processes instead of threads. That's what this patch does. When\n> > > client program forks, Valgrind forks too, and that allows for the needed\n> > > parallelism to handle the page fault.\n> > You understand process vs. threads more than me. But shouldn't mmap() use\n> > MAP_SHARED instead of MAP_PRIVATE for those which aren't using /dev/userfaultfd?\n\n> The documentation for userfaultfd mentions threads.  I'm afraid we'll\n> lose vital coverage if we move to forked processes.\n\n+1, at least some tests would keep threads (not all userfaultfd tests would be\nconverted, but yes, that's why I suggested to use MAP_SHARED, which could be\nsimilar to threads (yes, the difference between processes and threads in Linux\nkernel is not that huge as both are created in clone(), it's mostly about what\nis shared).\n\n> Perhaps we should cover both?\n\nWhat do you mean by \"both\"?\n\nRun test with both processes and threads e.g. via .test_variants?\nBecause combine MAP_SHARED | MAP_PRIVATE is not possible (mutually exclusive).\n\n> Also checkout UFFD_FEATURE_EVENT_FORK and the BUGS section for this in\n> userfaultfd(2).\n+1\n\n> I have like 3 patches for userfaultfd that I'm afraid I'd have to rebase\n> then.\\ Best,\n\nYeah, that's life of an open source development.\n\nKind regards,\nPetr\n\n> Ricardo","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256\n header.s=susede2_rsa header.b=JxyJlXmB;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.cz\n header.i=@suse.cz header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=OdDFz/F/;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.cz header.i=@suse.cz header.a=rsa-sha256 header.s=susede2_rsa\n header.b=JxyJlXmB;\n\tdkim=neutral header.d=suse.cz header.i=@suse.cz header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=OdDFz/F/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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charset=\"iso-8859-2\"","Content-Transfer-Encoding":"quoted-printable","Errors-To":"ltp-bounces+incoming=patchwork.ozlabs.org@lists.linux.it","Sender":"\"ltp\" "}},{"id":3680596,"web_url":"http://patchwork.ozlabs.org/comment/3680596/","msgid":"","list_archive_url":null,"date":"2026-04-22T12:42:10","subject":"Re: [LTP] [Valgrind-developers] [PATCH] Make userfaultfd0{1, 3,\n 4} LTP tests valgrind compatible","submitter":{"id":92484,"url":"http://patchwork.ozlabs.org/api/people/92484/","name":"Ricardo Branco","email":"rbranco@suse.de"},"content":"On 4/22/26 2:17 PM, Petr Vorel wrote:\n>> Perhaps we should cover both?\n> What do you mean by \"both\"?\n>\n> Run test with both processes and threads e.g. via .test_variants?\n\nYes.\n\nBest,\nR","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","ltp@lists.linux.it"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ltp@picard.linux.it"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=suse.de header.i=@suse.de header.a=rsa-sha256\n header.s=susede2_rsa header.b=swXNCOF1;\n\tdkim=fail reason=\"signature verification failed\" header.d=suse.de\n header.i=@suse.de header.a=ed25519-sha256 header.s=susede2_ed25519\n header.b=ZygtBNLy;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key)\n header.d=suse.de header.i=@suse.de header.a=rsa-sha256 header.s=susede2_rsa\n header.b=swXNCOF1;\n\tdkim=neutral header.d=suse.de header.i=@suse.de header.a=ed25519-sha256\n header.s=susede2_ed25519 header.b=ZygtBNLy;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.linux.it\n (client-ip=2001:1418:10:5::2; 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