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Tue, 19 Mar 2024 06:56:41 -0700 (PDT) Date: Tue, 19 Mar 2024 06:56:41 -0700 In-Reply-To: <0000000000002750950613c53e72@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000563d3061403d83d@google.com> Subject: Re: [syzbot] Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [v9fs?] KMSAN: uninit-value in v9fs_evict_inode Author: eric.vanhensbergen@linux.dev #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs.git b4/fix-evict-uninitialized-value March 16, 2024 at 6:15 AM, "syzbot" wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 66a27abac311 Merge tag 'powerpc-6.9-1' of git://git.kernel.. > > git tree: upstream > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=147b32a5180000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=48bb382b96e7eda7 > > dashboard link: https://syzkaller.appspot.com/bug?extid=eb83fe1cce5833cd66a0 > > 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=12598006180000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105d8aa5180000 > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/37968fa0451e/disk-66a27aba.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/5b288c5c3088/vmlinux-66a27aba.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/792ddbf8146d/bzImage-66a27aba.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+eb83fe1cce5833cd66a0@syzkaller.appspotmail.com > > ===================================================== > > BUG: KMSAN: uninit-value in fscache_relinquish_cookie include/linux/fscache.h:307 [inline] > > BUG: KMSAN: uninit-value in v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356 > > fscache_relinquish_cookie include/linux/fscache.h:307 [inline] > > v9fs_evict_inode+0x109/0x130 fs/9p/vfs_inode.c:356 > > evict+0x3ae/0xa60 fs/inode.c:667 > > iput_final fs/inode.c:1741 [inline] > > iput+0x9ca/0xe10 fs/inode.c:1767 > > iget_failed+0x15e/0x180 fs/bad_inode.c:248 > > v9fs_fid_iget_dotl+0x375/0x570 fs/9p/vfs_inode_dotl.c:96 > > v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] > > v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142 > > legacy_get_tree+0x114/0x290 fs/fs_context.c:662 > > vfs_get_tree+0xa7/0x570 fs/super.c:1779 > > do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 > > path_mount+0x742/0x1f20 fs/namespace.c:3679 > > do_mount fs/namespace.c:3692 [inline] > > __do_sys_mount fs/namespace.c:3898 [inline] > > __se_sys_mount+0x725/0x810 fs/namespace.c:3875 > > __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 > > do_syscall_64+0xd5/0x1f0 > > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > > Uninit was created at: > > __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 > > __alloc_pages_node include/linux/gfp.h:238 [inline] > > alloc_pages_node include/linux/gfp.h:261 [inline] > > alloc_slab_page mm/slub.c:2175 [inline] > > allocate_slab mm/slub.c:2338 [inline] > > new_slab+0x2de/0x1400 mm/slub.c:2391 > > ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525 > > __slab_alloc mm/slub.c:3610 [inline] > > __slab_alloc_node mm/slub.c:3663 [inline] > > slab_alloc_node mm/slub.c:3835 [inline] > > kmem_cache_alloc_lru+0x6d7/0xbe0 mm/slub.c:3864 > > alloc_inode_sb include/linux/fs.h:3089 [inline] > > v9fs_alloc_inode+0x62/0x130 fs/9p/vfs_inode.c:228 > > alloc_inode+0x86/0x460 fs/inode.c:261 > > iget_locked+0x2bf/0xee0 fs/inode.c:1280 > > v9fs_fid_iget_dotl+0x7f/0x570 fs/9p/vfs_inode_dotl.c:62 > > v9fs_get_inode_from_fid fs/9p/v9fs.h:230 [inline] > > v9fs_mount+0xc02/0x12b0 fs/9p/vfs_super.c:142 > > legacy_get_tree+0x114/0x290 fs/fs_context.c:662 > > vfs_get_tree+0xa7/0x570 fs/super.c:1779 > > do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 > > path_mount+0x742/0x1f20 fs/namespace.c:3679 > > do_mount fs/namespace.c:3692 [inline] > > __do_sys_mount fs/namespace.c:3898 [inline] > > __se_sys_mount+0x725/0x810 fs/namespace.c:3875 > > __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 > > do_syscall_64+0xd5/0x1f0 > > entry_SYSCALL_64_after_hwframe+0x6d/0x75 > > CPU: 1 PID: 5014 Comm: syz-executor406 Not tainted 6.8.0-syzkaller-11136-g66a27abac311 #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 > > ===================================================== > > --- > > 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 >