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[2403:580d:fda1::299]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34ebab97affsm10524918a91.4.2025.12.30.01.28.53 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Dec 2025 01:28:55 -0800 (PST) Message-ID: <642a3e9a-f3f1-4673-8e06-d997b342e96b@suse.com> Date: Tue, 30 Dec 2025 19:58:50 +1030 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [6.19-rc3] xxhash invalid access during BTRFS mount From: Qu Wenruo To: Daniel J Blueman , David Sterba , Chris Mason , Linux BTRFS Cc: linux-crypto@vger.kernel.org, Linux Kernel References: <01d84dae-1354-4cd5-97ce-4b64a396316a@suse.com> Content-Language: en-US Autocrypt: addr=wqu@suse.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNGFF1IFdlbnJ1byA8d3F1QHN1c2UuY29tPsLAlAQTAQgAPgIbAwULCQgHAgYVCAkKCwIE FgIDAQIeAQIXgBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXVgBQkQ/lqxAAoJEMI9kfOh Jf6o+jIH/2KhFmyOw4XWAYbnnijuYqb/obGae8HhcJO2KIGcxbsinK+KQFTSZnkFxnbsQ+VY fvtWBHGt8WfHcNmfjdejmy9si2jyy8smQV2jiB60a8iqQXGmsrkuR+AM2V360oEbMF3gVvim 2VSX2IiW9KERuhifjseNV1HLk0SHw5NnXiWh1THTqtvFFY+CwnLN2GqiMaSLF6gATW05/sEd V17MdI1z4+WSk7D57FlLjp50F3ow2WJtXwG8yG8d6S40dytZpH9iFuk12Sbg7lrtQxPPOIEU rpmZLfCNJJoZj603613w/M8EiZw6MohzikTWcFc55RLYJPBWQ+9puZtx1DopW2jOwE0EWdWB rwEIAKpT62HgSzL9zwGe+WIUCMB+nOEjXAfvoUPUwk+YCEDcOdfkkM5FyBoJs8TCEuPXGXBO Cl5P5B8OYYnkHkGWutAVlUTV8KESOIm/KJIA7jJA+Ss9VhMjtePfgWexw+P8itFRSRrrwyUf E+0WcAevblUi45LjWWZgpg3A80tHP0iToOZ5MbdYk7YFBE29cDSleskfV80ZKxFv6koQocq0 vXzTfHvXNDELAuH7Ms/WJcdUzmPyBf3Oq6mKBBH8J6XZc9LjjNZwNbyvsHSrV5bgmu/THX2n g/3be+iqf6OggCiy3I1NSMJ5KtR0q2H2Nx2Vqb1fYPOID8McMV9Ll6rh8S8AEQEAAcLAfAQY AQgAJgIbDBYhBC3fcuWlpVuonapC4cI9kfOhJf6oBQJnEXWBBQkQ/lrSAAoJEMI9kfOhJf6o cakH+QHwDszsoYvmrNq36MFGgvAHRjdlrHRBa4A1V1kzd4kOUokongcrOOgHY9yfglcvZqlJ qfa4l+1oxs1BvCi29psteQTtw+memmcGruKi+YHD7793zNCMtAtYidDmQ2pWaLfqSaryjlzR /3tBWMyvIeWZKURnZbBzWRREB7iWxEbZ014B3gICqZPDRwwitHpH8Om3eZr7ygZck6bBa4MU o1XgbZcspyCGqu1xF/bMAY2iCDcq6ULKQceuKkbeQ8qxvt9hVxJC2W3lHq8dlK1pkHPDg9wO JoAXek8MF37R8gpLoGWl41FIUb3hFiu3zhDDvslYM4BmzI18QgQTQnotJH8= In-Reply-To: <01d84dae-1354-4cd5-97ce-4b64a396316a@suse.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 在 2025/12/30 19:26, Qu Wenruo 写道: > > > 在 2025/12/30 18:02, Daniel J Blueman 写道: >> Hi Dave, Chris et al, >> >> When mounting a BTRFS filesystem on 6.19-rc3 on ARM64 using xxhash >> checksumming and KASAN, I see invalid access: > > Mind to share the page size? As aarch64 has 3 different supported pages > size (4K, 16K, 64K). > > I'll give it a try on that branch. Although on my rc1 based development > branch it looks OK so far. Tried both 4K and 64K page size with KASAN enabled, all on 6.19-rc3 tag, no reproduce on newly created fs with xxhash. My environment is aarch64 VM on Orion O6 board. The xxhash implementation is the same xxhash64-generic: [ 17.035933] BTRFS: device fsid 260364b9-d059-410c-92de-56243c346d6d devid 1 transid 8 /dev/mapper/test-scratch1 (253:2) scanned by mount (629) [ 17.038033] BTRFS info (device dm-2): first mount of filesystem 260364b9-d059-410c-92de-56243c346d6d [ 17.038645] BTRFS info (device dm-2): using xxhash64 (xxhash64-generic) checksum algorithm [ 17.041303] BTRFS info (device dm-2): checking UUID tree [ 17.041390] BTRFS info (device dm-2): turning on async discard [ 17.041393] BTRFS info (device dm-2): enabling free space tree [ 19.032109] BTRFS info (device dm-2): last unmount of filesystem 260364b9-d059-410c-92de-56243c346d6d So there maybe something else involved, either related to the fs or the hardware. Thanks, Qu > > > And is this KASAN triggered for this particular fs or all any btrfs (no > matter csum)? > > Thanks, > Qu > >> >> BTRFS info (device nvme0n1p5): first mount of filesystem >> f99f2753-0283-4f93-8f5d-7a9f59f148cc >> BTRFS info (device nvme0n1p5): using xxhash64 (xxhash64-generic) >> checksum algorithm >> ================================================================== >> BUG: KASAN: invalid-access in xxh64_update (lib/xxhash.c:143 lib/ >> xxhash.c:283) >> Read of size 8 at addr 21ff000802247000 by task kworker/u48:3/48 >> Pointer tag: [21], memory tag: [c0] >> >> CPU: 1 UID: 0 PID: 48 Comm: kworker/u48:3 Tainted: G      E >> 6.19.0-rc3 #19 PREEMPTLAZY >> Tainted: [E]=UNSIGNED_MODULE >> Hardware name: LENOVO 83ED/LNVNB161216, BIOS NHCN60WW 09/11/2025 >> Workqueue: btrfs-endio-meta simple_end_io_work >> Call trace: >> show_stack (arch/arm64/kernel/stacktrace.c:501) (C) >> dump_stack_lvl (lib/dump_stack.c:122) >> print_address_description.isra.0 (mm/kasan/report.c:379) >> print_report (mm/kasan/report.c:450 (discriminator 1) >> mm/kasan/report.c:483 (discriminator 1)) >> kasan_report (mm/kasan/report.c:597) >> kasan_check_range (mm/kasan/sw_tags.c:86 (discriminator 1)) >> __hwasan_loadN_noabort (mm/kasan/sw_tags.c:158) >> xxh64_update (lib/xxhash.c:143 lib/xxhash.c:283) >> xxhash64_update (crypto/xxhash_generic.c:49) >> crypto_shash_finup (crypto/shash.c:123 (discriminator 1)) >> csum_tree_block (fs/btrfs/disk-io.c:110 (discriminator 3)) >> btrfs_validate_extent_buffer (fs/btrfs/disk-io.c:404) >> end_bbio_meta_read (fs/btrfs/extent_io.c:3822 (discriminator 1)) >> btrfs_bio_end_io (fs/btrfs/bio.c:146) >> simple_end_io_work (fs/btrfs/bio.c:382) >> process_one_work (./arch/arm64/include/asm/jump_label.h:36 >> ./include/trace/events/workqueue.h:110 kernel/workqueue.c:3262) >> worker_thread (kernel/workqueue.c:3334 (discriminator 2) >> kernel/workqueue.c:3421 (discriminator 2)) >> kthread (kernel/kthread.c:463) >> ret_from_fork (arch/arm64/kernel/entry.S:861) >> >> The buggy address belongs to the physical page: >> page: refcount:2 mapcount:0 mapping:00000000973bd0ac index:0x9731 >> pfn:0x882247 >> memcg:aaff000800ae1b00 >> aops:btree_aops ino:1 >> flags: 0x47e400000004020(lru|private|node=0|zone=2|kasantag=0x3f) >> raw: 047e400000004020 fffffdffe0089188 fffffdffe0089208 ccff000814148300 >> raw: 0000000000009731 10ff0008493322d0 00000002ffffffff aaff000800ae1b00 >> page dumped because: kasan: bad access detected >> >> Memory state around the buggy address: >> ffff000802246e00: 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 >> ffff000802246f00: 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 21 >>> ffff000802247000: c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 >> ^ >> ffff000802247100: c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 >> ffff000802247200: c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 c0 >> >> Let me know for any further testing or debug. >> >> Thanks, >>    Dan >> -- >> Daniel J Blueman >> > >