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b=MsuVrxeFVLYM73ColyjiKkUoy+ki29rSdaEx1WqTJHMdb/zwFuO48VaWGncnwEfpc F63Lys22NC2ZrGRn1ItwS5tP/uRUg2P2IigZEMJ24tSvI+IFj4HuMifoyebue6J6wr jxRs5hk6lMywbJib5Ra37MeZCxnECF1TKh5tFZiw= Date: Mon, 24 Aug 2026 18:22:04 -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, Song Liu , Yu Kuai , Li Nan , Xiao Ni , linux-raid@vger.kernel.org Subject: Re: [syzbot] [mm?] WARNING in setup_conf Message-Id: <20260824182204.d73425f7abbf90cfeae1580c@linux-foundation.org> In-Reply-To: <6a8cdbd6.dbb3a75c.7844.0013.GAE@google.com> References: <6a8cdbd6.dbb3a75c.7844.0013.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-Rspam-User: X-Rspamd-Queue-Id: C8F3D1C0004 X-Rspamd-Server: rspam07 X-Stat-Signature: qxfkkhyeaiihz6cbwbre6641zzw63bbp X-HE-Tag: 1787620926-378843 X-HE-Meta: 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 BoZilgI1 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 N0694j+q CgVRkCjKRE+kfj2KzbUeeiNzBEMQcJ1TmbwBuzS7u4Bs0GCeoipJW3OBQm8vwtlrjty/RHnCceK7MHhxfM/m9wL2hV91SQo97VoVMyeFGpq5guxJlP0ST3NJNclFuXMPfpg9OGxW5Abl7ggvIKPALmqXDC4rV+vMaXfIPxiYGck= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 24 Aug 2026 17:03:34 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 9d2ed026f031 Merge tag 'sysctl-7.03-rc1' of git://git.kern.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1124919e580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6e414d6e0a79e71d > dashboard link: https://syzkaller.appspot.com/bug?extid=75f49ec552cc74d9d69b > 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-9d2ed026.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/89c0c0c0f535/vmlinux-9d2ed026.xz > kernel image: https://storage.googleapis.com/syzbot-assets/80d7adeb0e7d/bzImage-9d2ed026.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+75f49ec552cc74d9d69b@syzkaller.appspotmail.com Thanks. drivers/md/raid10.c lacks some sanity checking. In setup_conf(): /* FIXME calc properly */ conf->mirrors = kzalloc_objs(struct raid10_info, mddev->raid_disks + max(0, -mddev->delta_disks)); passed a crazy large number into kzalloc_objs(), causing __alloc_frozen_pages_noprof() to hit if (WARN_ON_ONCE_GFP(order > MAX_PAGE_ORDER, gfp)) return NULL; > tipc: Started in network mode > tipc: Node identity 2007ff, cluster identity 4711 > tipc: Node number set to 2099199 > md: async del_gendisk mode will be removed in future, please upgrade to mdadm-4.5+ > ------------[ cut here ]------------ > 1 > WARNING: mm/page_alloc.c:5280 at __alloc_frozen_pages_noprof+0x2ce/0x380 mm/page_alloc.c:5280, CPU#0: syz.0.0/5310 > Modules linked in: > CPU: 0 UID: 0 PID: 5310 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 8e 2d 0e 00 8b 54 24 0c 49 83 3c 24 00 0f 85 ab fe ff ff e9 ac fe ff ff c6 05 74 6e 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:ffffc9000d50f520 EFLAGS: 00010246 > RAX: ffffc9000d50f500 RBX: 0000000000000015 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000d50f588 > RBP: ffffc9000d50f610 R08: ffffc9000d50f587 R09: 0000000000000000 > R10: ffffc9000d50f560 R11: fffff52001aa1eb1 R12: 0000000000000000 > R13: 1ffff92001aa1ea8 R14: 0000000000040dc0 R15: dffffc0000000000 > FS: 00007fe2b9aac6c0(0000) GS:ffff88808c519000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffc93d2c090 CR3: 0000000044100000 CR4: 0000000000352ef0 > Call Trace: > > alloc_pages_mpol+0x212/0x390 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+0x409/0x720 mm/slub.c:5359 > _kmalloc_noprof include/linux/slab.h:992 [inline] > _kzalloc_noprof include/linux/slab.h:1309 [inline] > setup_conf+0x28b/0xce0 drivers/md/raid10.c:3883 > raid10_run+0x1d2/0x16c0 drivers/md/raid10.c:3984 > md_run+0xdbd/0x1e00 drivers/md/md.c:6760 > do_md_run+0x35/0x720 drivers/md/md.c:6861 > md_ioctl+0x1c58/0x2580 drivers/md/md.c:8492 > blkdev_ioctl+0x5e3/0x740 block/ioctl.c:797 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] > do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fe2b8b9e0d9 > 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:00007fe2b9aabfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fe2b8e25fa0 RCX: 00007fe2b8b9e0d9 > RDX: 0000000000000000 RSI: 00000000400c0930 RDI: 0000000000000009 > RBP: 00007fe2b8c35024 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fe2b8e26038 R14: 00007fe2b8e25fa0 R15: 00007ffe1ca65d58 > > > > --- > 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