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Sun, 16 Aug 2026 12:25:48 -0700 (PDT) Date: Sun, 16 Aug 2026 12:25:48 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a820ebc.9ebadd4d.20b15e.001b.GAE@google.com> Subject: [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, 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 Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Stat-Signature: dcwm5iqfzpaacq9epk4y441ieiziyt8c X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 23F90100007 X-HE-Tag: 1786908348-610728 X-HE-Meta: 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 Vexy9a2L 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 oo8EXM/g 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 3d6d817622b0 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15927479580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a59830cba91a1981 dashboard link: https://syzkaller.appspot.com/bug?extid=805630f1453e490427fa compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3d6d8176.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d19e0514c02a/vmlinux-3d6d8176.xz kernel image: https://storage.googleapis.com/syzbot-assets/f6da706811f4/bzImage-3d6d8176.xz 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+0x2ce/0x380 mm/page_alloc.c:5280, CPU#0: syz.0.0/5319 Modules linked in: CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 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+0x2ce/0x380 mm/page_alloc.c:5280 Code: 74 10 4c 89 e7 89 54 24 0c e8 0e 2c 0e 00 8b 54 24 0c 49 83 3c 24 00 0f 85 ab fe ff ff e9 ac fe ff ff c6 05 95 d2 18 0e 01 90 <0f> 0b 90 e9 17 ff ff ff a9 00 00 08 00 48 8b 4c 24 10 4c 8d 44 24 RSP: 0018:ffffc9000e13fa20 EFLAGS: 00010246 RAX: ffffc9000e13fa00 RBX: 0000000000000013 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000e13fa88 RBP: ffffc9000e13fb08 R08: ffffc9000e13fa87 R09: 0000000000000000 R10: ffffc9000e13fa60 R11: fffff52001c27f51 R12: 0000000000000000 R13: 1ffff92001c27f48 R14: 0000000000040cc0 R15: dffffc0000000000 FS: 00007f6f4a58c6c0(0000) GS:ffff88808c549000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000010a0 CR3: 000000004323d000 CR4: 0000000000352ef0 Call Trace: alloc_pages_mpol+0x212/0x380 mm/mempolicy.c:2490 ___kmalloc_large_node+0x4c/0x120 mm/slub.c:5274 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:5305 __do_kmalloc_node mm/slub.c:5322 [inline] __kmalloc_noprof+0x405/0x720 mm/slub.c:5359 _kmalloc_noprof include/linux/slab.h:992 [inline] ep_write_iter+0x1bc/0x500 drivers/usb/gadget/legacy/inode.c:669 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6f4979e0d9 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:00007f6f4a58bfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6f49a25fa0 RCX: 00007f6f4979e0d9 RDX: 00000000ffffffb9 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f6f49835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6f49a26038 R14: 00007f6f49a25fa0 R15: 00007ffc6cf49328 --- 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 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