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10:14:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57BF81F000FF; Sat, 19 Sep 2026 10:14:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789812892; bh=P3mRO5ERFF12rfldiKsN3k3k/U09VMaw91+ycHm3ZBY=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=fU7P5hvlyzPCxY6+8WAOrz7kIDuHS7R5xBi8PF1o/RcU8TR/pSjvKrKWe4MV8j2FB xbhMnLSpGoNWs0OMmpserI9R4qidz6WsRWoMusJJFlLT1XCiVU/23EfmSbeoq4insJ 1CJx1nA5/aYGpVyfF/nNt1O0+FeqecHABdnPcJh8= Date: Sat, 19 Sep 2026 03:14:51 -0700 From: Andrew Morton To: syzbot Cc: apopple@nvidia.com, byungchul@sk.com, david@kernel.org, gourry@gourry.net, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, matthew.brost@intel.com, rakie.kim@sk.com, syzkaller-bugs@googlegroups.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck , v9fs@lists.linux.dev Subject: Re: [syzbot] [mm?] WARNING in v9fs_fid_get_acl (2) Message-Id: <20260919031451.3f47a8da8405e88fa1ab5398@linux-foundation.org> In-Reply-To: <6aae188b.71f81b7d.15fa6d.0004.GAE@google.com> References: <6aae188b.71f81b7d.15fa6d.0004.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 9BDCB20003 X-Stat-Signature: 53a1ofwoqkxk3xgdq67appdbr1b5hgqq X-Rspam-User: X-HE-Tag: 1789812893-740841 X-HE-Meta: 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 X9nq39vM Yqbfv3zfbr6ITkT+3+eGSbEBdx3NXzOfHr4iTvqWNYnL6QSoHC5oexnKuz6Hl/SnZPke355gTXTqNdb1PQD/yOVe6vgRvSX3len/pp5QBJAWCEeSEozV20JMq5X0mI/OI+BFDhniUZJHO0E/0HkRvshkAVSmnphpDTqMsGw0CTKFR8hQpzj5BVQdl2+HBUSWWxtGZhoS5EJDT0jCfSxN4oWgmZReRDqKf+I2Xu+xFAXY7PjzvqmukHL2b5Ny06hEVXUH+v+3KBk37/sVAhebLKQ4KlRMWNyll0tPQi2trw1THcyjJtr/9i6hn2WEMPuIK0XTzFQXSYwA29TCgX1hT2DtwmJjPbE9MK27pNttHp04Oa7Or5WxIZ+vAWpMrI5XfYMShJwk2ym+rzul7nEqavSfFcFpgKClqK3Tv2sxaPgX9z3B5lkeg4SsR9xYRIJgH4tjBQ79CmK7ynGUio6s+Jx93YaukEaqB0O4yBOpdP1+fUsUWkEuwzSPKb/ztSI+FTdlWCIOJPr4RsYLedVdOh531gNcwFy/cg+M8aIWupukRjGSUoF5fGcqc/FvsYDQKWIWSbCCpzaoeMNJsgmisWyiAoHM+NXsSrtVusJEiRULjHurT8oSmBq65ocE+/hiDfYbllxe3TxSrM7DU/i+T/uIk9yHPS1USeG4c5EEoEsMRN/RD8QmC3N4nSaQ8LmRQiH8znWBaSflZabQMY7XVZjfvt5A4se7dB/XH3r8iRXu/+iZ4GNnjWriLCR8o9iW/t1BHZ2FgLkuj8za3Y9bZnwjJ+oPVuKcyZHxyX2IzHqU9ujquKxOn7WRyyEoGX1q7ui9HSQ0g+uzABjcu3bG0yCrtRDdoQOmRUrxebS4TObQydh3kb4dQwiU60k+pfzmKUchEL/EEzPpFKIzI9tTOmjBQzQPvoo4hf5Dz+lbz/xxzkCm27EwyJhC2C3umNei/SmS6C+7qKQBMESvatmGxFCa0R+0+ t153GuZm ISkYpH6IzrFoqgE+rHzxk0mT4bXyinsl1GbgqgCZzqjofz/X8eEU8V5jmdeF+Zh19+93c9DycAanXGCyR9siw2JVHcmoFRhpH3rAtWCzieTZ5nSvqBoHLlKDwC9rit2FyQlbKRA/jfpVUZA4RThQJNHwTC5oWiR2oUVs/je6hTmkh387cQLqMDxyhq+xPUiuSobCiKD9sW7ap3fF5WRW2AtbQV8iGPYXzF1CuHXJPLPu62Yzgl/WAjKjz4ShSQuUvJiSuipWzIjwUuSFNPzXKBZnIK186l6K Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 18 Sep 2026 22:07:23 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 587858367581 Merge tag 'nfsd-7.3-1' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1361a115580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f > dashboard link: https://syzkaller.appspot.com/bug?extid=de6fd6789748a8aa64a0 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11f64df9580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e1a115580000 > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-58785836.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/f8460d7438eb/vmlinux-58785836.xz > kernel image: https://storage.googleapis.com/syzbot-assets/551bf08b9af2/bzImage-58785836.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+de6fd6789748a8aa64a0@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > 1 > WARNING: mm/page_alloc.c:5340 at alloc_order_allowed mm/page_alloc.c:5340 [inline], CPU#0: syz.1.357/7872 > WARNING: mm/page_alloc.c:5340 at __alloc_frozen_pages_noprof+0x2137/0x3300 mm/page_alloc.c:5397, CPU#0: syz.1.357/7872 Thanks. Caused by an old v9fs bug. A fix was proposed but never merged: https://lists.openwall.net/linux-kernel/2024/02/02/806?utm_source=chatgpt.com > Modules linked in: > CPU: 0 UID: 0 PID: 7872 Comm: syz.1.357 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:alloc_order_allowed mm/page_alloc.c:5340 [inline] > RIP: 0010:__alloc_frozen_pages_noprof+0x2137/0x3300 mm/page_alloc.c:5397 > Code: 13 00 00 39 84 24 98 00 00 00 0f 85 4a fa ff ff e9 91 f6 ff ff 80 3d e2 93 bb 0e 00 0f 85 9d e2 ff ff c6 05 d5 93 bb 0e 01 90 <0f> 0b 90 e9 8d e2 ff ff 31 c0 e9 5f ec ff ff 48 8b 7c 24 08 48 c7 > RSP: 0018:ffffc90004df7758 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000029 RDI: 0000000000040d40 > RBP: 0000000000000029 R08: 0000000000000000 R09: 0000000000000009 > R10: 0000000000000029 R11: 0000000000000000 R12: 0000000000040d40 > R13: 1ffff920009bef47 R14: 0000000000000000 R15: 1ffff920009bef05 > FS: 00007fc8804026c0(0000) GS:ffff8880d5b59000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fc88037dff8 CR3: 0000000037685000 CR4: 0000000000352ef0 > Call Trace: > > alloc_pages_mpol+0x201/0x550 mm/mempolicy.c:2486 > ___kmalloc_large_node+0xe8/0x130 mm/slub.c:5353 > __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5385 > __do_kmalloc_node mm/slub.c:5402 [inline] > __kmalloc_noprof+0x5a8/0x840 mm/slub.c:5439 > _kmalloc_noprof include/linux/slab.h:995 [inline] > _kzalloc_noprof include/linux/slab.h:1312 [inline] > v9fs_fid_get_acl+0x7a/0x120 fs/9p/acl.c:33 > __v9fs_get_acl fs/9p/acl.c:67 [inline] > v9fs_get_acl+0xe8/0x480 fs/9p/acl.c:93 > v9fs_qid_iget_dotl fs/9p/vfs_inode_dotl.c:131 [inline] > v9fs_inode_from_fid_dotl+0x26d/0x300 fs/9p/vfs_inode_dotl.c:154 > v9fs_get_new_inode_from_fid fs/9p/v9fs.h:264 [inline] > v9fs_get_tree+0x55c/0xb50 fs/9p/vfs_super.c:120 > vfs_get_tree+0x92/0x320 fs/super.c:1933 > fc_mount fs/namespace.c:1198 [inline] > do_new_mount_fc fs/namespace.c:3772 [inline] > do_new_mount fs/namespace.c:3848 [inline] > path_mount+0x7d0/0x24c0 fs/namespace.c:4168 > do_mount fs/namespace.c:4181 [inline] > __do_sys_mount fs/namespace.c:4397 [inline] > __se_sys_mount fs/namespace.c:4374 [inline] > __x64_sys_mount+0x293/0x310 fs/namespace.c:4374 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fc87f59e159 > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fc880402028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007fc87f825fa0 RCX: 00007fc87f59e159 > RDX: 0000200000000240 RSI: 0000200000000200 RDI: 0000000000000000 > RBP: 00007fc87f63503b R08: 0000200000000180 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fc87f826038 R14: 00007fc87f825fa0 R15: 00007ffeeb3b2c38 > > > > --- > 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