From mboxrd@z Thu Jan 1 00:00:00 1970 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 0F8E0C433F5 for ; Thu, 28 Apr 2022 16:13:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 893D46B00BD; Thu, 28 Apr 2022 12:13:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8436C6B00BE; Thu, 28 Apr 2022 12:13:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 70B168D0002; Thu, 28 Apr 2022 12:13:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id 5DBA46B00BD for ; Thu, 28 Apr 2022 12:13:04 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 1D9CC28F8 for ; Thu, 28 Apr 2022 16:13:04 +0000 (UTC) X-FDA: 79406781888.02.D21B8D1 Received: from alexa-out-sd-01.qualcomm.com (alexa-out-sd-01.qualcomm.com [199.106.114.38]) by imf13.hostedemail.com (Postfix) with ESMTP id 0FA5520069 for ; Thu, 28 Apr 2022 16:12:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1651162382; x=1682698382; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=FrfyPGyrRql3+c1AJp/BIgQHA9i1fgkYU3oOQT+9KWw=; b=wsKFhs4F6+G9+3zKica4jmL/P+7cFEz1hQTfxBrr8ZPi5CJ8zrt4U+yR QEvQvoSMM65YMJBtuGZccppvabDXiR4Ie8PFp0aPYZ6mEKesKWP7l5zpc 7b37JjlgOQZzYbxfWsCwwEghcXr1mvwyaUJmkh8lfK9GWFXqnAi1fhckW E=; Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by alexa-out-sd-01.qualcomm.com with ESMTP; 28 Apr 2022 09:13:01 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg01-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Apr 2022 09:13:00 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Thu, 28 Apr 2022 09:13:00 -0700 Received: from qian (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Thu, 28 Apr 2022 09:12:57 -0700 Date: Thu, 28 Apr 2022 12:12:54 -0400 From: Qian Cai To: Andrey Konovalov CC: , Andrew Morton , Marco Elver , Alexander Potapenko , Dmitry Vyukov , Andrey Ryabinin , kasan-dev , Linux Memory Management List , Vincenzo Frascino , "Catalin Marinas" , Will Deacon , "Mark Rutland" , Linux ARM , Peter Collingbourne , Evgenii Stepanov , LKML , Andrey Konovalov Subject: Re: [PATCH v6 00/39] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS Message-ID: <20220428161254.GA182@qian> References: <20220428141356.GB71@qian> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 0FA5520069 X-Stat-Signature: gc9ga7hdwkosxkn6jzzjcfmxzasar7cx Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=quicinc.com header.s=qcdkim header.b=wsKFhs4F; dmarc=pass (policy=none) header.from=quicinc.com; spf=pass (imf13.hostedemail.com: domain of quic_qiancai@quicinc.com designates 199.106.114.38 as permitted sender) smtp.mailfrom=quic_qiancai@quicinc.com X-Rspam-User: X-HE-Tag: 1651162374-983298 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Apr 28, 2022 at 05:28:12PM +0200, Andrey Konovalov wrote: > No ideas so far. > > Looks like the page has reserved tag set when it's being freed. > > Does this crash only happen with the SW_TAGS mode? No, the system is running exclusively with CONFIG_KASAN_GENERIC=y > Does this crash only happen when loading modules? Yes. Here is another sligtly different path at the bottom. > Does your system have any hot-plugged memory? No. BUG: Bad page state in process systemd-udevd pfn:403fc007c page:fffffd00fd001f00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x403fc007c flags: 0x1bfffc0000001000(reserved|node=1|zone=2|lastcpupid=0xffff) raw: 1bfffc0000001000 fffffd00fd001f08 fffffd00fd001f08 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set CPU: 101 PID: 2004 Comm: systemd-udevd Not tainted 5.17.0-rc8-next-20220317-dirty #39 Call trace: dump_backtrace show_stack dump_stack_lvl dump_stack bad_page free_pcp_prepare free_pages_prepare at mm/page_alloc.c:1348 (inlined by) free_pcp_prepare at mm/page_alloc.c:1403 free_unref_page __free_pages free_pages.part.0 free_pages kasan_depopulate_vmalloc_pte (inlined by) kasan_depopulate_vmalloc_pte at mm/kasan/shadow.c:359 apply_to_pte_range apply_to_pte_range at mm/memory.c:2547 apply_to_pmd_range apply_to_pud_range __apply_to_page_range apply_to_existing_page_range kasan_release_vmalloc (inlined by) kasan_release_vmalloc at mm/kasan/shadow.c:469 __purge_vmap_area_lazy _vm_unmap_aliases.part.0 __vunmap __vfree vfree module_memfree free_module do_init_module load_module __do_sys_finit_module __arm64_sys_finit_module invoke_syscall el0_svc_common.constprop.0 do_el0_svc el0_svc el0t_64_sync_handler el0t_64_sync Disabling lock debugging due to kernel taint BUG: Bad page state in process systemd-udevd pfn:403fc007b page:fffffd00fd001ec0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x403fc007b flags: 0x1bfffc0000001000(reserved|node=1|zone=2|lastcpupid=0xffff) raw: 1bfffc0000001000 fffffd00fd001ec8 fffffd00fd001ec8 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set CPU: 101 PID: 2004 Comm: systemd-udevd Tainted: G B 5.17.0-rc8-next-20220317-dirty #39 Call trace: dump_backtrace show_stack dump_stack_lvl dump_stack bad_page free_pcp_prepare free_unref_page __free_pages free_pages.part.0 free_pages kasan_depopulate_vmalloc_pte apply_to_pte_range apply_to_pmd_range apply_to_pud_range __apply_to_page_range apply_to_existing_page_range kasan_release_vmalloc __purge_vmap_area_lazy _vm_unmap_aliases.part.0 __vunmap __vfree vfree module_memfree free_module do_init_module load_module __do_sys_finit_module __arm64_sys_finit_module invoke_syscall el0_svc_common.constprop.0 do_el0_svc el0_svc el0t_64_sync_handler el0t_64_sync