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AJvYcCUz7ngJQv5wq+eVoVkcDsHyEggIVqYmIUW7OlPbNwlrSTaHKBE+1lVhmPFA8bX2AuGfdUD9chEsD3JbgAPJPQ==@vger.kernel.org X-Gm-Message-State: AOJu0Yydzoq9epiS+2ymmVFPCi31k35Y6EzGLdcUH1SAitTjXlDD9G3X XCMj6DpcmBmKZxGWOUQhzaTwdDQR7SG99EiMmsRcQ1R6lZITCxZ6xalN0PuixglgpZPiq0sg4sC SN+mGkBFi61gv9p2Dz8JhncB5YdoXp3WZM6vzls0UXirTreufuaytW3U= X-Google-Smtp-Source: AGHT+IEoviy+l5JXFxU3qZ/Jygx3Q1zYvygjSxOjv65SMOmbFLQumKvtLsMV6VJlDf0x8TUMk+F/qMPqV/6oM+KRB8CqOf826J7I Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:18ca:b0:3a7:e701:bd1b with SMTP id e9e14a558f8ab-3a7f9ab0f4dmr41934375ab.20.1733250626933; Tue, 03 Dec 2024 10:30:26 -0800 (PST) Date: Tue, 03 Dec 2024 10:30:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <674f4e42.050a0220.17bd51.004c.GAE@google.com> Subject: [syzbot] [bcachefs?] KMSAN: uninit-value in LZ4_decompress_safe_partial From: syzbot To: kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 509f806f7f70 Merge tag 's390-6.13-2' of git://git.kernel.o.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=17f3b9e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d66c9f9a88c492bd dashboard link: https://syzkaller.appspot.com/bug?extid=3c88ea590c13f5f92152 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14da1f78580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100bb9e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e3bcf9103a9e/disk-509f806f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a595be33a5b0/vmlinux-509f806f.xz kernel image: https://storage.googleapis.com/syzbot-assets/3488b782ca32/bzImage-509f806f.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7a0522f2b5b7/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3c88ea590c13f5f92152@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in LZ4_decompress_generic lib/lz4/lz4_decompress.c:148 [inline] BUG: KMSAN: uninit-value in LZ4_decompress_safe_partial+0x825/0x1e50 lib/lz4/lz4_decompress.c:473 LZ4_decompress_generic lib/lz4/lz4_decompress.c:148 [inline] LZ4_decompress_safe_partial+0x825/0x1e50 lib/lz4/lz4_decompress.c:473 __bio_uncompress+0x503/0xa30 fs/bcachefs/compress.c:166 bch2_bio_uncompress+0x4d9/0x800 fs/bcachefs/compress.c:283 __bch2_read_endio+0x1b17/0x3070 fs/bcachefs/io_read.c:617 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:4774 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 alloc_pages_noprof+0x1bf/0x1e0 mm/mempolicy.c:2344 __bio_alloc_page_pool fs/bcachefs/io_write.c:113 [inline] bch2_bio_alloc_pages_pool+0xc2/0x2d0 fs/bcachefs/io_write.c:134 __bch2_read_extent+0x33b8/0x6a50 fs/bcachefs/io_read.c:988 bch2_read_extent fs/bcachefs/io_read.h:120 [inline] bchfs_read+0x2f5e/0x3660 fs/bcachefs/fs-io-buffered.c:217 bch2_readahead+0x14a8/0x1970 fs/bcachefs/fs-io-buffered.c:277 read_pages+0x193/0x1110 mm/readahead.c:160 page_cache_ra_order+0xdbb/0x1290 mm/readahead.c:513 page_cache_sync_ra+0xed1/0x11a0 mm/readahead.c:613 page_cache_sync_readahead include/linux/pagemap.h:1397 [inline] filemap_get_pages+0x5a8/0x3860 mm/filemap.c:2546 filemap_read+0x613/0x1560 mm/filemap.c:2646 bch2_read_iter+0x1a90/0x2010 fs/bcachefs/fs-io-direct.c:208 __kernel_read+0x726/0xd30 fs/read_write.c:523 integrity_kernel_read+0x77/0x90 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0x1731/0x3c90 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x464/0xd20 security/integrity/ima/ima_api.c:293 process_measurement+0x294a/0x3f30 security/integrity/ima/ima_main.c:372 ima_file_check+0x8e/0xd0 security/integrity/ima/ima_main.c:572 security_file_post_open+0xc6/0x540 security/security.c:3121 do_open fs/namei.c:3830 [inline] path_openat+0x58cc/0x6200 fs/namei.c:3987 do_filp_open+0x268/0x600 fs/namei.c:4014 do_sys_openat2+0x1bf/0x2f0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x2a1/0x310 fs/open.c:1428 x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 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: 4883 Comm: kworker/u8:24 Not tainted 6.12.0-syzkaller-10740-g509f806f7f70 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound __bch2_read_endio ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup