Re: [USB] WARNING: mm/page_alloc.c:5345 at __alloc_frozen_pages_noprof+0x39a/0x3d0, CPU#41: swapper/0/1

[Hao Ge <hao.ge@linux.dev>]

Hi Luiz

On 2026/9/22 10:28, Luiz Capitulino wrote:
> Hello,
> 
> When booting the latest Andrew Morton's mm-new tree[1] commit 498ee28e5ec4
> ("mm/swap, PM: hibernate: atomically replace hibernation pin") on a KVM guest,
> I'm getting the following MM warning being triggered:
> 
> """
> [    1.667197] [      T1] WARNING: mm/page_alloc.c:5345 at __alloc_frozen_pages_noprof+0x39a/0x3d0, CPU#41: swapper/0/1
> [    1.691217] [      T1] CPU: 41 UID: 0 PID: 1 Comm: swapper/0 Tainted: G        W           7.3.0-rc1+ #12 PREEMPT(full)
> [    1.692073] [      T1] Tainted: [W]=WARN
> [    1.692378] [      T1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS edk2-20260812-8.fc44 08/12/2026
> [    1.693158] [      T1] RIP: 0010:__alloc_frozen_pages_noprof+0x39a/0x3d0
> [    1.693685] [      T1] Code: e2 04 e8 49 85 ff ff 45 31 c9 e9 14 fe ff ff 0f 0b e9 e7 fe ff ff 80 3d 6d 3a f2 05 00 0f 85 2b fe ff ff c6 05 60 3a f2 05 01 <0f> 0b e9 1d fe ff ff 48 89 5c 24 40 48 89 6c 24 48 4c 89 64 24 50
> [    1.695238] [      T1] RSP: 0000:ff46f50b801538d8 EFLAGS: 00010246
> [    1.695723] [      T1] RAX: 0000000000000000 RBX: 0000000000000cc0 RCX: 0000000000000000
> [    1.696356] [      T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000cc0
> [    1.696981] [      T1] RBP: 0000000000000034 R08: 0000000000000000 R09: 0000000000000cc0
> [    1.697605] [      T1] R10: 0000000000000034 R11: 0000000000000100 R12: 0000000000000034
> [    1.698231] [      T1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [    1.698872] [      T1] FS:  0000000000000000(0000) GS:ff2b932745209000(0000) knlGS:0000000000000000
> [    1.699592] [      T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.700119] [      T1] CR2: 0000000000000000 CR3: 00000006ede4a001 CR4: 0000000000773ef0
> [    1.700745] [      T1] PKRU: 55555554
> [    1.701023] [      T1] Call Trace:
> [    1.701283] [      T1]  <TASK>
> [    1.701512] [      T1]  alloc_pages_node_noprof+0x4c/0xc0
> [    1.701919] [      T1]  __dma_direct_alloc_pages.isra.0+0x164/0x1f0
> [    1.702402] [      T1]  dma_direct_alloc+0x19f/0x2b0
> [    1.702767] [      T1]  dma_alloc_attrs+0x8d/0x200
> [    1.703133] [      T1]  xhci_alloc_interrupter+0xc9/0x190
> [    1.703543] [      T1]  xhci_mem_init+0x283/0x340
> [    1.703902] [      T1]  ? __pfx_xhci_pci_quirks+0x10/0x10
> [    1.704317] [      T1]  xhci_gen_setup+0x35e/0x4f0
> [    1.704684] [      T1]  xhci_pci_setup+0x52/0x1c0
> [    1.705038] [      T1]  usb_add_hcd.cold+0x241/0x5d8
> [    1.705413] [      T1]  usb_hcd_pci_probe+0x188/0x480
> [    1.705803] [      T1]  xhci_pci_common_probe+0x6b/0x2f0
> [    1.706218] [      T1]  local_pci_probe+0x4a/0x90
> [    1.706582] [      T1]  ? cpu_hotplug_disable+0x15/0x30
> [    1.706986] [      T1]  pci_call_probe+0x55/0x150
> [    1.707357] [      T1]  pci_device_probe+0xae/0x150
> [    1.707734] [      T1]  ? kernfs_create_link+0x61/0xb0
> [    1.708139] [      T1]  ? sysfs_do_create_link_sd+0x81/0xf0
> [    1.708562] [      T1]  call_driver_probe+0x23/0x100
> [    1.708949] [      T1]  ? driver_sysfs_add+0x55/0xc0
> [    1.709334] [      T1]  really_probe+0xd7/0x2d0
> [    1.709681] [      T1]  ? _raw_spin_unlock_irq+0xe/0x30
> [    1.710098] [      T1]  __driver_probe_device+0x9c/0x1b0
> [    1.710503] [      T1]  driver_probe_device+0x1f/0x80
> [    1.710892] [      T1]  ? __pfx___driver_attach+0x10/0x10
> [    1.711323] [      T1]  __driver_attach+0x10a/0x210
> [    1.711706] [      T1]  ? __pfx___driver_attach+0x10/0x10
> [    1.712125] [      T1]  bus_for_each_dev+0x86/0xf0
> [    1.712488] [      T1]  bus_add_driver+0x13e/0x230
> [    1.712858] [      T1]  ? __pfx_xhci_pci_init+0x10/0x10
> [    1.713273] [      T1]  ? __pfx_xhci_pci_init+0x10/0x10
> [    1.713681] [      T1]  driver_register+0x75/0xe0
> [    1.714049] [      T1]  do_one_initcall+0x7a/0x1c0
> [    1.714429] [      T1]  do_initcalls+0xe1/0x100
> [    1.714780] [      T1]  kernel_init_freeable+0x152/0x1c0
> [    1.715199] [      T1]  ? __pfx_kernel_init+0x10/0x10
> [    1.715592] [      T1]  kernel_init+0x1f/0x140
> [    1.715928] [      T1]  ret_from_fork+0x19e/0x270
> [    1.716296] [      T1]  ? __pfx_kernel_init+0x10/0x10
> [    1.716680] [      T1]  ? __pfx_kernel_init+0x10/0x10
> [    1.717071] [      T1]  ret_from_fork_asm+0x1a/0x30
> [    1.717438] [      T1]  </TASK>
> [    1.717663] [      T1] ---[ end trace 0000000000000000 ]---
> """
> 
> This does not happen with latest Linus tree 40288c9206c1 ("Merge tag
> 'drm-fixes-2026-09-19' of https://gitlab.freedesktop.org/drm/kernel").
> 
> What I could determine is:
> 
> - In xhci_alloc_interrupter() max_segs=0, which leds to seg=0
> 
> - This eventually leads to passing size=0 to get_order() in
>   __dma_direct_alloc_pages() (call sequenece below). Passing size=0 to
>   get_order() is undefined and returns order=52 on my guest, whch leads
>   to the warning since 52 > MAX_PAGE_ORDER
> 
>     xhci_alloc_erst()
>       dma_alloc_coherent()
>         dma_alloc_attrs()
>           dma_direct_alloc()
>             __dma_direct_alloc_pages()
>             get_order()
>             alloc_pages_node()
> 
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm origin/mm-new
> 

Thanks for the report. From my understanding, it is already
fixed in mainline by 045b5bef916d ("usb: xhci: Fix HCS_ERST_MAX conversion").

Thanks
Best Regards
Hao