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AHgh+RqOna5znF1byabkkZHV8rpXUtFiZ6TiSAq58EU8iXzQCX3IJA6Ck6igvmLa2KNzTgbSnR2ZdfOcpQ39UZA=@vger.kernel.org X-Gm-Message-State: AOJu0YwEyaLe1NadqgezkWot2puKhSX5QMECdZ1LCOdwzsvyomiOmNFt AIVtBePtu5PlI04tb6dB07WFOCDEWFyT4qQIZOLWwvL7SHYDBL62bceudkqZB/XZhngjmfagnBV JobUGbjecsMNSeEeOEmcIDTok9TO0altQEBoBBUdmE5cPv5SrXDvdyTZBC6M= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1ca2:b0:6aa:f0fd:3f0a with SMTP id 006d021491bc7-6b0d68ebd55mr19778363eaf.30.1786958071630; Mon, 17 Aug 2026 02:14:31 -0700 (PDT) Date: Mon, 17 Aug 2026 02:14:31 -0700 In-Reply-To: <6a820ebc.9ebadd4d.20b15e.001b.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a82d0f7.dbb3a75c.20434b.004d.GAE@google.com> Subject: Re: [syzbot] [mm?] WARNING in ep_write_iter From: syzbot To: akpm@linux-foundation.org, apopple@nvidia.com, byungchul@sk.com, david@kernel.org, gourry@gourry.net, gregkh@linuxfoundation.org, joshua.hahnjy@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, matthew.brost@intel.com, rakie.kim@sk.com, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com, ying.huang@linux.alibaba.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 8d3ae59288f1 Linux 7.2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13bad949580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d67342c314f228d dashboard link: https://syzkaller.appspot.com/bug?extid=805630f1453e490427fa compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1637ea25580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com gadgetfs: bound to dummy_udc driver ------------[ cut here ]------------ 1 WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280, CPU#2: syz-executor421/6034 Modules linked in: CPU: 2 UID: 0 PID: 6034 Comm: syz-executor421 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_frozen_pages_noprof+0x2427/0x2dc0 mm/page_alloc.c:5280 Code: e9 8d fb ff ff 31 d2 be 28 12 00 00 48 c7 c7 a0 74 01 8c e8 7b 95 68 ff 2e 2e 2e 31 c0 e9 02 ed ff ff c6 05 85 90 bc 0e 01 90 <0f> 0b 90 e9 6f df ff ff 48 c7 c7 80 be f3 8e 45 89 f7 44 8b 74 24 RSP: 0018:ffffc900048c7810 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 1ffff92000918f1c RDI: 0000000000040cc0 RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000009 R10: 0000000000000013 R11: 0000000000000000 R12: 0000000000040cc0 R13: 1ffff92000918f5a R14: ffffffff9b95c444 R15: 0000000000000001 FS: 00005555738a6400(0000) GS:ffff8880d5dde000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd5f5d6fe8 CR3: 0000000020943000 CR4: 0000000000352ef0 Call Trace: alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490 ___kmalloc_large_node+0xe5/0x120 mm/slub.c:5274 __kmalloc_large_node_noprof+0x1c/0x70 mm/slub.c:5305 __do_kmalloc_node mm/slub.c:5322 [inline] __kmalloc_noprof+0x5a1/0x820 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] ep_write_iter+0x180/0xbc0 drivers/usb/gadget/legacy/inode.c:669 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7cc18b5cb7 Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd5f5d76e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00005555738a6400 RCX: 00007f7cc18b5cb7 RDX: 000000007fffffff RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007ffd5f5d7730 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffd5f5d7930 R13: 00007f7cc18ea039 R14: 00007ffd5f5d7b30 R15: 0000000000000002 --- 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.