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AJvYcCWT1tPknpeyHAfNeO8/srfuaoch7vmu3sN2nIJh5lRX6DBjgi2KTCkhJ6CjM+s1GQ+A9+j9H0FBAbNCjpJCGw==@vger.kernel.org X-Gm-Message-State: AOJu0YymdpvQIPmyg7sRQppfXuRVpq07ZyHvZhF9qBH20xU+k58qktFZ gFSB6IDlWWsRmsNYSdz2mDA0OMEujGOd+0mydwKJ/91oGB8E9z8WZSJo4lXtzm5zVPzh7STghy3 lOdtdAHOYsEMrPi7Fn5OpeAYHAuYVRxxePbkmD+lwq9458RnNhA+QjTc= X-Google-Smtp-Source: AGHT+IFyv2Y0w3dnfVz5Zrx2l4eBibmvlywpi8nPIbJDKKtxyFJ2FTJ2Fc0cQA1EmAhb3BV9wVVS7e963Hd4jnh3C3LmhWbtN6Lo Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:164f:b0:3a7:c81e:825f with SMTP id e9e14a558f8ab-3bb09e8b71emr27050065ab.9.1734433221339; Tue, 17 Dec 2024 03:00:21 -0800 (PST) Date: Tue, 17 Dec 2024 03:00:21 -0800 In-Reply-To: <6750931a.050a0220.17bd51.0071.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <676159c5.050a0220.37aaf.0166.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] KMSAN: uninit-value in bch2_dev_freespace_init 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" syzbot has found a reproducer for the following issue on: HEAD commit: f44d154d6e3d Merge tag 'soc-fixes-6.13' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13c0a7e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=caeefc00e8b4dc9f dashboard link: https://syzkaller.appspot.com/bug?extid=aa2232cb0e5de0c0b56f 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=10dc74f8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/009edf262d35/disk-f44d154d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9929be9055fe/vmlinux-f44d154d.xz kernel image: https://storage.googleapis.com/syzbot-assets/24e56358f05d/bzImage-f44d154d.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/18b4c753db11/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+aa2232cb0e5de0c0b56f@syzkaller.appspotmail.com bcachefs (loop1): going read-write bcachefs (loop1): marking superblocks bcachefs (loop1): initializing freespace ===================================================== BUG: KMSAN: uninit-value in bch2_alloc_to_v4 fs/bcachefs/alloc_background.h:235 [inline] BUG: KMSAN: uninit-value in bch2_dev_freespace_init+0x1044/0x1eb0 fs/bcachefs/alloc_background.c:2232 bch2_alloc_to_v4 fs/bcachefs/alloc_background.h:235 [inline] bch2_dev_freespace_init+0x1044/0x1eb0 fs/bcachefs/alloc_background.c:2232 bch2_fs_freespace_init+0x599/0xb30 fs/bcachefs/alloc_background.c:2304 bch2_fs_initialize+0x2140/0x35d0 fs/bcachefs/recovery.c:1082 bch2_fs_start+0x77d/0xbd0 fs/bcachefs/super.c:1038 bch2_fs_get_tree+0x13ea/0x22d0 fs/bcachefs/fs.c:2170 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507 path_mount+0x742/0x1f10 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x722/0x810 fs/namespace.c:4034 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 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 created at: ___kmalloc_large_node+0x22c/0x370 mm/slub.c:4253 __kmalloc_large_node_noprof+0x3f/0x1e0 mm/slub.c:4270 __do_kmalloc_node mm/slub.c:4286 [inline] __kmalloc_node_noprof+0xc96/0x1250 mm/slub.c:4304 __kvmalloc_node_noprof+0xc0/0x2d0 mm/util.c:650 btree_node_data_alloc fs/bcachefs/btree_cache.c:153 [inline] __bch2_btree_node_mem_alloc+0x2be/0xa80 fs/bcachefs/btree_cache.c:198 bch2_fs_btree_cache_init+0x4e4/0xb50 fs/bcachefs/btree_cache.c:653 bch2_fs_alloc fs/bcachefs/super.c:917 [inline] bch2_fs_open+0x4d3a/0x5b40 fs/bcachefs/super.c:2065 bch2_fs_get_tree+0x983/0x22d0 fs/bcachefs/fs.c:2157 vfs_get_tree+0xb1/0x5a0 fs/super.c:1814 do_new_mount+0x71f/0x15e0 fs/namespace.c:3507 path_mount+0x742/0x1f10 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x722/0x810 fs/namespace.c:4034 __x64_sys_mount+0xe4/0x150 fs/namespace.c:4034 x64_sys_call+0x39bf/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:166 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: 6157 Comm: syz.1.21 Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 ===================================================== --- 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.