From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29C611D9694 for ; Thu, 17 Oct 2024 10:11:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729159866; cv=none; b=s02maARyyCG44I4qVGxMhHPIiBkt0o7MJHJM+Xa/uKnzUCq/oOX2edOtPDvHzV/QsHHrusbtvXp3conP1eMXwGfzkNdQzGozC4NH6u2LD4kU22Pj2MeoA8a4XDeqU9o2nMFpmE2AYHN62sNrSbRLNDdZpMH5EX42wtmg4Xdv3Kk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729159866; c=relaxed/simple; bh=iuYmvJgF15YExjzwdkzqIiKIbBQ8Gp11W+K8Lb8mNWs=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2167:b0:3a3:983a:874f with SMTP id e9e14a558f8ab-3a3bcdc6bfamr166934485ab.12.1729159862225; Thu, 17 Oct 2024 03:11:02 -0700 (PDT) Date: Thu, 17 Oct 2024 03:11:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6710e2b6.050a0220.d5849.0027.GAE@google.com> Subject: Re: [syzbot] [exfat?] KMSAN: uninit-value in __exfat_get_dentry_set From: syzbot To: linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, yuezhang.mo@sony.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KMSAN: uninit-value in __exfat_get_dentry_set loop0: detected capacity change from 0 to 256 exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x726052d3, utbl_chksum : 0xe619d30d) ===================================================== BUG: KMSAN: uninit-value in __exfat_get_dentry_set+0x10ca/0x14d0 fs/exfat/dir.c:804 __exfat_get_dentry_set+0x10ca/0x14d0 fs/exfat/dir.c:804 exfat_get_dentry_set+0x58/0xec0 fs/exfat/dir.c:859 __exfat_write_inode+0x3c1/0xe30 fs/exfat/inode.c:46 exfat_write_inode+0x15f/0x250 fs/exfat/inode.c:109 write_inode fs/fs-writeback.c:1503 [inline] __writeback_single_inode+0x8da/0x1290 fs/fs-writeback.c:1723 writeback_single_inode+0x32f/0x9c0 fs/fs-writeback.c:1779 sync_inode_metadata+0xa4/0xe0 fs/fs-writeback.c:2849 exfat_truncate+0x839/0xd00 fs/exfat/file.c:212 exfat_write_failed fs/exfat/inode.c:421 [inline] exfat_direct_IO+0x5ae/0x910 fs/exfat/inode.c:485 generic_file_direct_write+0x275/0x6a0 mm/filemap.c:3977 __generic_file_write_iter+0x242/0x460 mm/filemap.c:4141 exfat_file_write_iter+0x894/0xfb0 fs/exfat/file.c:576 do_iter_readv_writev+0x88a/0xa30 vfs_writev+0x56a/0x14f0 fs/read_write.c:1064 do_pwritev fs/read_write.c:1165 [inline] __do_sys_pwritev2 fs/read_write.c:1224 [inline] __se_sys_pwritev2+0x280/0x470 fs/read_write.c:1215 __x64_sys_pwritev2+0x11f/0x1a0 fs/read_write.c:1215 x64_sys_call+0x2edb/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:329 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: memcpy_to_iter lib/iov_iter.c:65 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] _copy_to_iter+0xe53/0x2b30 lib/iov_iter.c:185 copy_page_to_iter+0x419/0x880 lib/iov_iter.c:362 shmem_file_read_iter+0xa09/0x12b0 mm/shmem.c:3167 do_iter_readv_writev+0x88a/0xa30 vfs_iter_read+0x278/0x760 fs/read_write.c:923 lo_read_simple drivers/block/loop.c:283 [inline] do_req_filebacked drivers/block/loop.c:516 [inline] loop_handle_cmd drivers/block/loop.c:1910 [inline] loop_process_work+0x20fc/0x3750 drivers/block/loop.c:1945 loop_workfn+0x48/0x60 drivers/block/loop.c:1969 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was stored to memory at: memcpy_from_iter lib/iov_iter.c:73 [inline] iterate_bvec include/linux/iov_iter.h:123 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] copy_page_from_iter_atomic+0x12b7/0x3100 lib/iov_iter.c:481 copy_folio_from_iter_atomic include/linux/uio.h:201 [inline] generic_perform_write+0x8d1/0x1080 mm/filemap.c:4066 shmem_file_write_iter+0x2ba/0x2f0 mm/shmem.c:3221 do_iter_readv_writev+0x88a/0xa30 vfs_iter_write+0x44d/0xd40 fs/read_write.c:988 lo_write_bvec drivers/block/loop.c:243 [inline] lo_write_simple drivers/block/loop.c:264 [inline] do_req_filebacked drivers/block/loop.c:511 [inline] loop_handle_cmd drivers/block/loop.c:1910 [inline] loop_process_work+0x15e6/0x3750 drivers/block/loop.c:1945 loop_workfn+0x48/0x60 drivers/block/loop.c:1969 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xae0/0x1c40 kernel/workqueue.c:3310 worker_thread+0xea7/0x14f0 kernel/workqueue.c:3391 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4756 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 alloc_pages_noprof mm/mempolicy.c:2345 [inline] folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2352 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1010 __filemap_get_folio+0xac4/0x1550 mm/filemap.c:1952 block_write_begin+0x6e/0x2b0 fs/buffer.c:2226 exfat_write_begin+0xfb/0x410 fs/exfat/inode.c:434 exfat_extend_valid_size fs/exfat/file.c:531 [inline] exfat_file_write_iter+0x474/0xfb0 fs/exfat/file.c:566 do_iter_readv_writev+0x88a/0xa30 vfs_writev+0x56a/0x14f0 fs/read_write.c:1064 do_pwritev fs/read_write.c:1165 [inline] __do_sys_pwritev2 fs/read_write.c:1224 [inline] __se_sys_pwritev2+0x280/0x470 fs/read_write.c:1215 __x64_sys_pwritev2+0x11f/0x1a0 fs/read_write.c:1215 x64_sys_call+0x2edb/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:329 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 5994 Comm: syz.0.15 Not tainted 6.12.0-rc3-syzkaller-gc964ced77262-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== Tested on: commit: c964ced7 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16ab745f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=5242e0e980477c72 dashboard link: https://syzkaller.appspot.com/bug?extid=01218003be74b5e1213a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1615e830580000