From patchwork Tue Feb 11 06:01:57 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13969433 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C51D9C021A1 for ; Tue, 11 Feb 2025 06:02:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B364E28000C; Tue, 11 Feb 2025 01:02:10 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A98D7280004; Tue, 11 Feb 2025 01:02:10 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8D5C628000C; Tue, 11 Feb 2025 01:02:10 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 60B62280005 for ; 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b=ttDnyvxCF7PsEWP5YB5QdE4Ksk0AkLATMRFClZ0Pirfp7Y8glgPVIDuq0wNNyPzu3UCiekhrF3PmfsDVgh60bg0kyeI0xRnnM4DxrcqF1QC2smg2CEy/cdHhqMsTi1ZLclgiYwLZYLv6p04B2oMX436qYYm00Lc3h+hnQifdylQ= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WPFiSHq_1739253722 cluster:ay36) by smtp.aliyun-inc.com; Tue, 11 Feb 2025 14:02:03 +0800 From: Shuai Xue To: tony.luck@intel.com, bp@alien8.de, nao.horiguchi@gmail.com Cc: tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, linmiaohe@huawei.com, akpm@linux-foundation.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, baolin.wang@linux.alibaba.com, tianruidong@linux.alibaba.com Subject: [PATCH v1 1/4] x86/mce: Collect error message for severities below MCE_PANIC_SEVERITY Date: Tue, 11 Feb 2025 14:01:57 +0800 Message-ID: <20250211060200.33845-2-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20250211060200.33845-1-xueshuai@linux.alibaba.com> References: <20250211060200.33845-1-xueshuai@linux.alibaba.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: C4250C0002 X-Stat-Signature: irbtj5qi7dm6qpxic7bz1srfpcinot3p X-HE-Tag: 1739253727-802863 X-HE-Meta: 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 NOJUnM7t pDisLtc4slE/Z4EXsgB0Uq6yNqvwy4kuF/iTcZ5o0VQyEaW+nkOqKbOH71at3V2WWVVdXeQHLQosZ8RmnJPIDXNnnXQm/T2F3bgHOJJGtEAjkRMjuIA4M98/Mi6RGrhl13XyMIuy49gUYQLNjhkR+eK4hRD3kp7/Qyj3YXqE+rjtAApGycBY3YZVkDMb5EHmpX3yi1JWaBBj/TPxBRABFk63Tw3CDEUF8U3W1+AuYVseDMSlVA2caEIaHMavicj6u0HTutTlYfZN7X/cO2ZyRn82dGczp9Eg3CUSG+XeHW3VTFawxlGjHgpIJKJJQEocEMpgPi7RwMbLgJOZt1AaJmTOayUCwfaa5PyQ/tz1OJ3l++zXxU7rl7SXu4dI4YT+CZulr X-Bogosity: Ham, tests=bogofilter, spamicity=0.033149, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Currently, mce_no_way_out() only collects error messages when the error severity is equal to `MCE_PANIC_SEVERITY`. To improve diagnostics, modify the behavior to also collect error messages when the severity is less than `MCE_PANIC_SEVERITY`. Signed-off-by: Shuai Xue --- arch/x86/kernel/cpu/mce/core.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 0dc00c9894c7..2919a077cd66 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -925,11 +925,12 @@ static __always_inline void quirk_zen_ifu(int bank, struct mce *m, struct pt_reg * Do a quick check if any of the events requires a panic. * This decides if we keep the events around or clear them. */ -static __always_inline int mce_no_way_out(struct mce_hw_err *err, char **msg, unsigned long *validp, - struct pt_regs *regs) +static __always_inline bool mce_no_way_out(struct mce_hw_err *err, char **msg, + unsigned long *validp, + struct pt_regs *regs) { struct mce *m = &err->m; - char *tmp = *msg; + char *tmp = *msg, cur_sev = MCE_NO_SEVERITY, sev; int i; for (i = 0; i < this_cpu_read(mce_num_banks); i++) { @@ -945,13 +946,17 @@ static __always_inline int mce_no_way_out(struct mce_hw_err *err, char **msg, un quirk_zen_ifu(i, m, regs); m->bank = i; - if (mce_severity(m, regs, &tmp, true) >= MCE_PANIC_SEVERITY) { + sev = mce_severity(m, regs, &tmp, true); + if (sev >= cur_sev) { mce_read_aux(err, i); *msg = tmp; - return 1; + cur_sev = sev; } + + if (cur_sev == MCE_PANIC_SEVERITY) + return true; } - return 0; + return false; } /* From patchwork Tue Feb 11 06:01:58 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13969434 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D02DC021A0 for ; Tue, 11 Feb 2025 06:02:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E24CC280004; Tue, 11 Feb 2025 01:02:10 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D2EB528000B; Tue, 11 Feb 2025 01:02:10 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B334F280005; 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a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1739253725; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=tlo8q8j4Pp6YSO9Kcn8UqITwpqL/bxjMQZvrf+MMEtk=; b=s3Qa1bznsMZa+22fTwNfe6B3QSNouENiV80kb/pe4sOJzcUmQ8fNcY47n15BfcDbcPYMS7+nIvM6QFIAovNuAQ9Tv0nbanKFaonm5/sKyJK4A4vXoUva6gm8NgxKtcBznPBkH8+som4Lytml998MQd6nEtpwRpTR4G9jVq+ID90= Received: from localhost.localdomain(mailfrom:xueshuai@linux.alibaba.com fp:SMTPD_---0WPFiSI3_1739253723 cluster:ay36) by smtp.aliyun-inc.com; Tue, 11 Feb 2025 14:02:04 +0800 From: Shuai Xue To: tony.luck@intel.com, bp@alien8.de, nao.horiguchi@gmail.com Cc: tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, linmiaohe@huawei.com, akpm@linux-foundation.org, linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, baolin.wang@linux.alibaba.com, tianruidong@linux.alibaba.com Subject: [PATCH v1 2/4] x86/mce: dump error msg from severities Date: Tue, 11 Feb 2025 14:01:58 +0800 Message-ID: <20250211060200.33845-3-xueshuai@linux.alibaba.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20250211060200.33845-1-xueshuai@linux.alibaba.com> References: <20250211060200.33845-1-xueshuai@linux.alibaba.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: F27E88000B X-Stat-Signature: cne19qigypmpjbt8aczkna5aq6u8kprw X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1739253727-42346 X-HE-Meta: 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 eJbQSEcT 6sOMj1lD+MD/xTvdW8/KGAhv5gnYHqRBhO6uz88YsZ0RngqstQsKEGxCE/V+wB+tzUxhCBSVVuTJ/ciwurSIWOZeVhnSsXgJRuS/YwbCDDpyZqhIiJpQW4yanYkuOhu0ICaBpK8EIxMtL8Ao7i2L+87eyP88RHTlJ82nxBUxeHzdUY+fWxwDryKuswLEHvAjM8WxeCdYblGIJLdjT12OztEF9jKTmf809GcZxWDjR++QlJUACCZNxaYTY05Ub5G7DrTwuGCbUS045xPQNb/UfrLjpEIs16NLdufxwF2ALJI3wkLw= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000055, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The message in severities is useful for identifying the type of MCE that has occurred; dump it if it is valid. Signed-off-by: Shuai Xue --- arch/x86/kernel/cpu/mce/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 2919a077cd66..c1319db45b0a 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -1456,6 +1456,8 @@ static void queue_task_work(struct mce_hw_err *err, char *msg, void (*func)(stru if (count > 1) return; + if (msg) + pr_err("%s\n", msg); task_work_add(current, ¤t->mce_kill_me, TWA_RESUME); } From patchwork Tue Feb 11 06:01:59 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13969435 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B8A17C021A1 for ; Tue, 11 Feb 2025 06:02:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C988B28000B; 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Specifically, commit 99641e094d6c ("x86/uaccess: Remove .fixup usage") altered the extable fixup type for the get_user family, while commit 4c132d1d844a ("x86/futex: Remove .fixup usage") addressed the futex operations. This change inadvertently caused a regression where the error context for some copy-from-user operations no longer functions as an in-kernel recovery context, leading to kernel panics with the message: "Machine check: Data load in unrecoverable area of kernel." To fix the regression, add EX_TYPE_EFAULT_REG as a in-kernel recovery context for copy-from-user operations. Signed-off-by: Shuai Xue --- arch/x86/kernel/cpu/mce/severity.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/cpu/mce/severity.c b/arch/x86/kernel/cpu/mce/severity.c index dac4d64dfb2a..14c2d71c3ce1 100644 --- a/arch/x86/kernel/cpu/mce/severity.c +++ b/arch/x86/kernel/cpu/mce/severity.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "internal.h" @@ -285,7 +286,8 @@ static bool is_copy_from_user(struct pt_regs *regs) */ static noinstr int error_context(struct mce *m, struct pt_regs *regs) { - int fixup_type; + const struct exception_table_entry *e; + int fixup_type, imm; bool copy_user; if ((m->cs & 3) == 3) @@ -294,9 +296,14 @@ static noinstr int error_context(struct mce *m, struct pt_regs *regs) if (!mc_recoverable(m->mcgstatus)) return IN_KERNEL; + e = search_exception_tables(m->ip); + if (!e) + return IN_KERNEL; + /* Allow instrumentation around external facilities usage. */ instrumentation_begin(); - fixup_type = ex_get_fixup_type(m->ip); + fixup_type = FIELD_GET(EX_DATA_TYPE_MASK, e->data); + imm = FIELD_GET(EX_DATA_IMM_MASK, e->data); copy_user = is_copy_from_user(regs); instrumentation_end(); @@ -304,9 +311,13 @@ static noinstr int error_context(struct mce *m, struct pt_regs *regs) case EX_TYPE_UACCESS: if (!copy_user) return IN_KERNEL; - m->kflags |= MCE_IN_KERNEL_COPYIN; - fallthrough; - + m->kflags |= MCE_IN_KERNEL_COPYIN | MCE_IN_KERNEL_RECOV; + return IN_KERNEL_RECOV; + case EX_TYPE_IMM_REG: + if (!copy_user || imm != -EFAULT) + return IN_KERNEL; + m->kflags |= MCE_IN_KERNEL_COPYIN | MCE_IN_KERNEL_RECOV; + return IN_KERNEL_RECOV; case EX_TYPE_FAULT_MCE_SAFE: case EX_TYPE_DEFAULT_MCE_SAFE: m->kflags |= MCE_IN_KERNEL_RECOV; From patchwork Tue Feb 11 06:02:00 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shuai Xue X-Patchwork-Id: 13969436 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64A51C0219E for ; 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If the CMCI wins that race, the page is marked poisoned when uc_decode_notifier() calls memory_failure(). For dirty pages, memory_failure() invokes try_to_unmap() with the TTU_HWPOISON flag, converting the PTE to a hwpoison entry. However, for clean pages, the TTU_HWPOISON flag is cleared, leaving the PTE unchanged and not converted to a hwpoison entry. Consequently, for an unmapped dirty page, the PTE is marked as a hwpoison entry allowing kill_accessing_process() to: - call walk_page_range() and return 1 - call kill_proc() to make sure a SIGBUS is sent - return -EHWPOISON to indicate that SIGBUS is already sent to the process and kill_me_maybe() doesn't have to send it again. Conversely, for clean pages where PTE entries are not marked as hwpoison, kill_accessing_process() returns -EFAULT, causing kill_me_maybe() to send a SIGBUS. Console log looks like this: Memory failure: 0x827ca68: corrupted page was clean: dropped without side effects Memory failure: 0x827ca68: recovery action for clean LRU page: Recovered Memory failure: 0x827ca68: already hardware poisoned mce: Memory error not recovered To fix it, return -EHWPOISON if no hwpoison PTE entry is found, preventing an unnecessary SIGBUS. Fixes: 046545a661af ("mm/hwpoison: fix error page recovered but reported "not recovered"") Signed-off-by: Shuai Xue --- mm/memory-failure.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 995a15eb67e2..f9a6b136a6f0 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -883,10 +883,9 @@ static int kill_accessing_process(struct task_struct *p, unsigned long pfn, (void *)&priv); if (ret == 1 && priv.tk.addr) kill_proc(&priv.tk, pfn, flags); - else - ret = 0; mmap_read_unlock(p->mm); - return ret > 0 ? -EHWPOISON : -EFAULT; + + return ret >= 0 ? -EHWPOISON : -EFAULT; } /*