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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2025 15:01:31.9979 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: zuIQzXYs2AF1etUUQGKqYaoxPOKtKS+MoGZVx0FoYuX9YsD1rG93nu9PgNnRZ1R7 X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8784 On 29 Jun 2025, at 18:47, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: dfba48a70cb6 Merge tag 'i2c-for-6.16-rc4' of git://git.ke= r.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D14a6298258000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D79da270cec5ff= d65 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D359a67b608de1ef= 72f65 > compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e0775= 7-1~exp1~20250514183223.118), Debian LLD 20.1.6 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d= 900f083ada3/non_bootable_disk-dfba48a7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/783560258712/vmlinu= x-dfba48a7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/685ad235ac7b/b= zImage-dfba48a7.xz > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+359a67b608de1ef72f65@syzkaller.appspotmail.com > > loop0: detected capacity change from 0 to 32768 > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 5325 at mm/page_alloc.c:4430 This warning fires when one tries to allocate a >1 order page with __GFP_NOFAIL. > __alloc_pages_slowpath+0xcb3/0xce0 mm/page_alloc.c:4430 > Modules linked in: > CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted 6.16.0-rc3-syzkaller-00= 329-gdfba48a70cb6 #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.= 16.3-2~bpo12+1 04/01/2014 > RIP: 0010:__alloc_pages_slowpath+0xcb3/0xce0 mm/page_alloc.c:4430 > Code: d8 48 c1 e8 03 0f b6 04 08 84 c0 75 2e f6 43 01 08 48 8b 14 24 0f 8= 4 a2 f3 ff ff 90 0f 0b 90 e9 99 f3 ff ff e8 ae 09 50 09 90 <0f> 0b 90 f7 c5= 00 04 00 00 75 bc 90 0f 0b 90 eb b6 89 d9 80 e1 07 > RSP: 0018:ffffc9000d62f970 EFLAGS: 00010246 > RAX: 1378840d66abe400 RBX: 0000000000000002 RCX: dffffc0000000000 > RDX: ffffc9000d62fa80 RSI: 0000000000000002 RDI: 0000000000048cc0 > RBP: 0000000000048cc0 R08: ffff88801b68003f R09: 1ffff110036d0007 > R10: dffffc0000000000 R11: ffffed10036d0008 R12: ffffc9000d62fa80 > R13: 1ffff92001ac5f4c R14: 0000000000048cc0 R15: dffffc0000000000 > FS: 00007fcd1cbf46c0(0000) GS:ffff88808d250000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fcd1bd726e0 CR3: 0000000043166000 CR4: 0000000000352ef0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:4972 > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 > alloc_slab_page mm/slub.c:2451 [inline] > allocate_slab+0xe2/0x3b0 mm/slub.c:2627 > new_slab mm/slub.c:2673 [inline] new_slab() allows __GFP_NOFAIL, since GFP_RECLAIM_MASK has it. In allocate_slab(), the first allocation without __GFP_NOFAIL failed, the retry used __GFP_NOFAIL but kmem_cache order was greater than 1, which led to the warning above. Maybe allocate_slab() should just fail when kmem_cache order is too big and first trial fails? I am no expert, so add Vlastimil for help. Barry, who added the nofail warning is cc=E2=80=99d. > ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 > __slab_alloc mm/slub.c:3949 [inline] > __slab_alloc_node mm/slub.c:4024 [inline] > slab_alloc_node mm/slub.c:4185 [inline] > __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4354 > kmalloc_noprof include/linux/slab.h:905 [inline] > kzalloc_noprof include/linux/slab.h:1039 [inline] > xfs_init_fs_context+0x54/0x500 fs/xfs/xfs_super.c:2279 > alloc_fs_context+0x651/0x7d0 fs/fs_context.c:318 > do_new_mount+0x10e/0xa40 fs/namespace.c:3881 > do_mount fs/namespace.c:4239 [inline] > __do_sys_mount fs/namespace.c:4450 [inline] > __se_sys_mount+0x317/0x410 fs/namespace.c:4427 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fcd1bd900ca > Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 8= 4 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff= ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fcd1cbf3e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007fcd1cbf3ef0 RCX: 00007fcd1bd900ca > RDX: 0000200000000040 RSI: 0000200000009640 RDI: 00007fcd1cbf3eb0 > RBP: 0000200000000040 R08: 00007fcd1cbf3ef0 R09: 0000000000208800 > R10: 0000000000208800 R11: 0000000000000246 R12: 0000200000009640 > R13: 00007fcd1cbf3eb0 R14: 000000000000964b R15: 0000200000001340 > > > > --- > 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 Best Regards, Yan, Zi