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[80.230.25.45]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490bc23394asm39489705e9.0.2026.06.03.21.14.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2026 21:14:39 -0700 (PDT) Date: Thu, 4 Jun 2026 00:14:35 -0400 From: "Michael S. Tsirkin" To: Andrew Morton Cc: syzbot , 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, linux-next@vger.kernel.org, matthew.brost@intel.com, rakie.kim@sk.com, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com, ying.huang@linux.alibaba.com, ziy@nvidia.com Subject: Re: [syzbot] [mm?] linux-next test error: kernel BUG in post_alloc_hook Message-ID: <20260604001334-mutt-send-email-mst@kernel.org> References: <6a20a309.85ccb786.283107.0005.GAE@google.com> <20260603154737.48dfcc19a51da03241e1af48@linux-foundation.org> MIME-Version: 1.0 In-Reply-To: <20260603154737.48dfcc19a51da03241e1af48@linux-foundation.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: xg0ZmSQzeSkQdf0Jq4rCbbHwsAvKah7l8r3syHOJUr0_1780546480 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 89292A0006 X-Rspam-User: X-Stat-Signature: wmawybhs3tzxxta1kqyqhzn8mfy9z1yd X-HE-Tag: 1780546483-474681 X-HE-Meta: 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 3Bf4wsEn 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 FZOlv89f QYwhJwP5Bg3tPEN+MjfVZkPayPt4BYuf7Llg3zUXQ2kofWl/FLvxk1eq98qpaYhYLL18bCcP1Fc5DVh6tlu+2Sr4wCOvf+gnzekz5kx4YwzaM4ueY9XQBjJ5SPAr0OrHJ8WBQqecrb1KY62WMx26A1muVkQVwiOnrrzicCgR58pnA3AEq/Drwxq5SyUfVh2Aw9UMReI4vanBnhxxW+L4FbwyRcu9fC2IwsZgTSbQ4jZS0JiDhx9c+QaY8j1zFTBEhuCYb6hofcfbE4ixpsI1o8HuVaPqw/u7nO2UQsXXmLgCaj0/28AHs1tI9nKqKwTm Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jun 03, 2026 at 03:47:37PM -0700, Andrew Morton wrote: > (cc Mike Tsirkin) > > On Wed, 03 Jun 2026 14:56:25 -0700 syzbot wrote: > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: a225caacc365 Add linux-next specific files for 20260603 > > git tree: linux-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=13b0de66580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=717edf2a5f9fc390 > > dashboard link: https://syzkaller.appspot.com/bug?extid=8ffca916f3fa5455f9b4 > > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/f799d07ea17d/disk-a225caac.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/72d0f0ff94e6/vmlinux-a225caac.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/99d4279e6fec/bzImage-a225caac.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+8ffca916f3fa5455f9b4@syzkaller.appspotmail.com > > > > ... > > > > ********************************************************** > > ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > > ** ** > > ** This system shows unhashed kernel memory addresses ** > > ** via the console, logs, and other interfaces. This ** > > ** might reduce the security of your system. ** > > ** ** > > ** If you see this message and you are not debugging ** > > ** the kernel, report this immediately to your system ** > > ** administrator! ** > > ** ** > > ** Use hash_pointers=always to force this mode off ** > > ** ** > > ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > > ********************************************************** > > Geeze, who added that. > > > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13fe38 > > head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > > flags: 0x100000000000040(head|node=0|zone=2) > > raw: 0100000000000040 dead000000000100 dead000000000122 0000000000000000 > > raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > > head: 0100000000000040 dead000000000100 dead000000000122 0000000000000000 > > head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > > head: 0100000000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff > > head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004 > > page dumped because: VM_BUG_ON_PAGE(1 && PageCompound(page)) > > ------------[ cut here ]------------ > > kernel BUG at ./include/linux/page-flags.h:682! > > Oops: invalid opcode: 0000 [#1] SMP KASAN PTI > > CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted syzkaller #0 PREEMPT_{RT,(undef)} > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 > > RIP: 0010:__ClearPagePrezeroed include/linux/page-flags.h:682 [inline] > > RIP: 0010:post_alloc_hook+0x287/0x310 mm/page_alloc.c:1863 > > That's the __ClearPagePrezeroed(page) added by 504f40f6bda6 ("mm: > page_reporting: skip redundant zeroing of host-zeroed reported pages"). > > Was it intended that this series > (https://lore.kernel.org/cover.1779315441.git.mst@redhat.com) be > included in -next? It's huge, it's late, review is minor. Of course not ( I've no idea how that happened. Should not push to next late at night. > > > > Code: ff ff 89 da be 01 00 00 00 48 c7 c7 40 50 4f 8e e8 ce 4b d4 02 e9 c5 fe ff ff 4c 89 ef 48 c7 c6 40 ef 7a 8b e8 2a c6 05 ff 90 <0f> 0b 31 ed f7 44 24 04 00 01 00 00 0f 84 8e fd ff ff e9 86 fd ff > > RSP: 0000:ffffffff8e0078e0 EFLAGS: 00010046 > > RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff8e0fef40 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 > > R10: dffffc0000000000 R11: ffffed10170c4903 R12: dffffc0000000000 > > R13: ffffea0004ff8e00 R14: 1ffffd40009ff1c0 R15: 0000000000000000 > > FS: 0000000000000000(0000) GS:ffff888125a79000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffff88823ffff000 CR3: 000000000e1b8000 CR4: 00000000000100b0 > > Call Trace: > > > > prep_new_page mm/page_alloc.c:1925 [inline] > > get_page_from_freelist+0x3081/0x3320 mm/page_alloc.c:4015 > > __alloc_frozen_pages_noprof+0x194/0x380 mm/page_alloc.c:5376 > > __alloc_pages_mpol+0xe0/0x390 mm/mempolicy.c:2495 > > alloc_slab_page mm/slub.c:3287 [inline] > > allocate_slab+0x83/0x5e0 mm/slub.c:3404 > > new_slab mm/slub.c:3447 [inline] > > ___slab_alloc+0x160/0x930 mm/slub.c:4485 > > __slab_alloc_node mm/slub.c:4549 [inline] > > slab_alloc_node mm/slub.c:4925 [inline] > > __do_kmalloc_node mm/slub.c:5331 [inline] > > __kmalloc_noprof+0x140/0x7b0 mm/slub.c:5345 > > _kmalloc_noprof include/linux/slab.h:973 [inline] > > _kzalloc_noprof include/linux/slab.h:1286 [inline] > > __alloc_empty_sheaf mm/slub.c:2774 [inline] > > alloc_empty_sheaf mm/slub.c:2794 [inline] > > init_percpu_sheaves mm/slub.c:7555 [inline] > > do_kmem_cache_create+0x8ae/0x9a0 mm/slub.c:8595 > > create_boot_cache+0xbf/0x120 mm/slab_common.c:717 > > create_kmalloc_cache+0x41/0xb0 mm/slab_common.c:735 > > new_kmalloc_cache+0xd4/0x180 mm/slab_common.c:982 > > create_kmalloc_caches+0x14/0x50 mm/slab_common.c:1005 > > kmem_cache_init+0x14a/0x1e0 mm/slub.c:8496 > > mm_core_init+0x7e/0xb0 mm/mm_init.c:2728 > > start_kernel+0x162/0x3e0 init/main.c:1034 > > x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 > > x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291 > > common_startup_64+0x13e/0x157 > > > > Modules linked in: > > ---[ end trace 0000000000000000 ]--- > > RIP: 0010:__ClearPagePrezeroed include/linux/page-flags.h:682 [inline] > > RIP: 0010:post_alloc_hook+0x287/0x310 mm/page_alloc.c:1863 > > Code: ff ff 89 da be 01 00 00 00 48 c7 c7 40 50 4f 8e e8 ce 4b d4 02 e9 c5 fe ff ff 4c 89 ef 48 c7 c6 40 ef 7a 8b e8 2a c6 05 ff 90 <0f> 0b 31 ed f7 44 24 04 00 01 00 00 0f 84 8e fd ff ff e9 86 fd ff > > RSP: 0000:ffffffff8e0078e0 EFLAGS: 00010046 > > RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff8e0fef40 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > > RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 > > R10: dffffc0000000000 R11: ffffed10170c4903 R12: dffffc0000000000 > > R13: ffffea0004ff8e00 R14: 1ffffd40009ff1c0 R15: 0000000000000000 > > FS: 0000000000000000(0000) GS:ffff888125a79000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: ffff88823ffff000 CR3: 000000000e1b8000 CR4: 00000000000100b0 > > > > > > --- > > 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