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Fri, 20 Mar 2026 10:07:11 -0400 (EDT) Date: Fri, 20 Mar 2026 15:07:10 +0100 From: Marek =?utf-8?Q?Marczykowski-G=C3=B3recki?= To: Harry Yoo Cc: Laurent Pinchart , Hans de Goede , linux-media@vger.kernel.org, linux-mm@kvack.org Subject: Re: Linux 7.0-rc4: v4l2src0:src: page allocation failure - increased memory usage in 7.0? 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On Fri, Mar 20, 2026 at 10:01:33AM +0900, Harry Yoo wrote: > On Thu, Mar 19, 2026 at 01:18:18AM +0100, Marek Marczykowski-G=C3=B3recki= wrote: > > Hello, > >=20 > > When testing 7.0-rc4 (and also got it with 7.0-rc1), I got page > > allocation failure in uvcvideo when using v4l2 camera in a VM. The setup > > is rather memory constrained - it's a HVM with just 300MB of memory > > running on Xen, with PCI passthrough of USB controllers (to which an USB > > camera is connected). But the very same setup works just fine with older > > kernel (last known good is 6.19.5, built with the same config). >=20 > Could you please share what /proc/meminfo looks like on v6.19, and > also enable memory allocation profiling feature [1] and see > what has changed between v6.19 and v7.0? >=20 > On v6.19, you should be able to see how much memory is allocated by > reading /proc/allocinfo. >=20 > On v7.0-rc4, warn_alloc() should let memory allocation profiling > print top users. >=20 > [1] https://docs.kernel.org/mm/allocation-profiling.html Thanks, this got me some more info (below). That said, I think I spoke too soon about 6.19.5 - the page allocation failure happens there too, just without follow up crash, and v4l2 generally works afterwards (maybe few initial frames got lost? not sure) - so, I haven't noticed it before. So, it doesn't look like increased memory usage anymore. The message: [ 30.986973] v4l2src0:src: page allocation failure: order:5, mode:0xcc0(G= FP_KERNEL), nodemask=3D(null),cpuset=3D/,mems_allowed=3D0 [ 30.987035] CPU: 1 UID: 1000 PID: 1256 Comm: v4l2src0:src Not tainted 6.= 19.5-1.qubes.42.fc41.x86_64 #1 PREEMPT(full)=20 [ 30.987038] Hardware name: Xen HVM domU, BIOS 4.19.4 02/20/2026 [ 30.987039] Call Trace: [ 30.987041] [ 30.987044] dump_stack_lvl+0x5d/0x80 [ 30.987049] warn_alloc+0x162/0x190 [ 30.987052] ? __alloc_pages_direct_compact+0x1bc/0x220 [ 30.987054] __alloc_pages_slowpath.constprop.0+0x566/0x9b0 [ 30.987056] ? kernfs_next_descendant_post+0x1b/0xe0 [ 30.987059] __alloc_frozen_pages_noprof+0x31b/0x330 [ 30.987062] __alloc_pages_noprof+0xe/0x20 [ 30.987063] __dma_direct_alloc_pages.isra.0+0x1b2/0x3b0 [ 30.987066] dma_direct_alloc_pages+0x3f/0x190 [ 30.987068] alloc_single_sgt+0x12a/0x200 [ 30.987071] dma_alloc_noncontiguous+0x49/0x150 [ 30.987074] usb_alloc_noncoherent+0x45/0xa0 [ 30.987079] uvc_alloc_urb_buffers.part.0+0x95/0x130 [uvcvideo] [ 30.987092] uvc_video_start_transfer+0x19d/0x4e0 [uvcvideo] [ 30.987100] uvc_video_start_streaming+0x9c/0x140 [uvcvideo] [ 30.987107] uvc_start_streaming_video+0x58/0x100 [uvcvideo] [ 30.987116] vb2_start_streaming+0x63/0x130 [videobuf2_common] [ 30.987123] vb2_core_streamon+0x98/0xf0 [videobuf2_common] [ 30.987128] ? vb2_ioctl_streamon+0x15/0x60 [videobuf2_v4l2] [ 30.987133] __video_do_ioctl+0x419/0x540 [videodev] [ 30.987155] video_usercopy+0x286/0x690 [videodev] [ 30.987168] ? __pfx___video_do_ioctl+0x10/0x10 [videodev] [ 30.987181] v4l2_ioctl+0x6b/0xa0 [videodev] [ 30.987194] __x64_sys_ioctl+0x96/0xe0 [ 30.987198] do_syscall_64+0x84/0x6c0 [ 30.987201] ? __handle_mm_fault+0x470/0x700 [ 30.987204] ? count_memcg_events+0xdd/0x1a0 [ 30.987207] ? handle_mm_fault+0x220/0x340 [ 30.987209] ? do_user_addr_fault+0x2c3/0x7f0 [ 30.987212] ? irqentry_exit+0x7a/0x510 [ 30.987214] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 30.987216] RIP: 0033:0x7953bd8838db [ 30.987219] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 = 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89= > c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 [ 30.987220] RSP: 002b:00007953abffea90 EFLAGS: 00000246 ORIG_RAX: 000000= 0000000010 [ 30.987222] RAX: ffffffffffffffda RBX: 00007953a0008620 RCX: 00007953bd8= 838db [ 30.987224] RDX: 000000002f404da0 RSI: 0000000040045612 RDI: 00000000000= 00013 [ 30.987225] RBP: 000000002f404d90 R08: 00007953a000a9e0 R09: 00000000000= 00040 [ 30.987225] R10: 00007953a000aa10 R11: 0000000000000246 R12: 00000000000= 00000 [ 30.987226] R13: 00007953a0008638 R14: 0000000000000004 R15: 00007953a00= 08620 [ 30.987228] [ 30.987263] Mem-Info: [ 30.987939] active_anon:3060 inactive_anon:1925 isolated_anon:0 [ 30.987939] active_file:5208 inactive_file:3901 isolated_file:0 [ 30.987939] unevictable:0 dirty:8 writeback:0 [ 30.987939] slab_reclaimable:2569 slab_unreclaimable:12482 [ 30.987939] mapped:5743 shmem:33 pagetables:1341 [ 30.987939] sec_pagetables:0 bounce:0 [ 30.987939] kernel_misc_reclaimable:0 [ 30.987939] free:2402 free_pcp:115 free_cma:0 [ 30.988045] Node 0 active_anon:12240kB inactive_anon:7700kB active_file:= 20832kB inactive_file:15604kB unevictable:0kB isolated(anon):0kB isolated(f= ile):0kB mapped:22972kB dirty:32kB writeback:0kB shmem:132kB shmem_thp:0kB = shmem_pmdmapped:0kB anon_thp:0kB kernel_stack:3392kB pagetables:5364kB sec_= pagetables:0kB all_unreclaimable? no Balloon:16384kB [ 30.988123] Node 0 DMA free:904kB boost:0kB min:132kB low:164kB high:196= kB reserved_highatomic:0KB free_highatomic:0KB active_anon:1408kB inactive_= anon:300kB active_file:368kB inactive_file:3664kB unevictable:0kB writepend= ing:0kB zspages:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB = free_pcp:0kB local_pcp:0kB free_cma:0kB [ 30.988199] lowmem_reserve[]: 0 194 194 194 194 [ 30.988227] Node 0 DMA32 free:8704kB boost:0kB min:1716kB low:2144kB hig= h:2572kB reserved_highatomic:0KB free_highatomic:0KB active_anon:10832kB in= active_anon:7400kB active_file:20464kB inactive_file:11940kB unevictable:0k= B writepending:32kB zspages:0kB present:274148kB managed:199276kB mlocked:0= kB bounce:0kB free_pcp:456kB local_pcp:0kB free_cma:0kB [ 30.988305] lowmem_reserve[]: 0 0 0 0 0 [ 30.988319] Node 0 DMA: 4*4kB (UM) 31*8kB (UM) 16*16kB (UM) 4*32kB (UM) = 4*64kB (UM) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 904kB [ 30.988365] Node 0 DMA32: 604*4kB (UM) 524*8kB (UM) 108*16kB (UM) 10*32k= B (UM) 1*64kB (U) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB =3D 87= 20kB [ 30.988422] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_surp= =3D0 hugepages_size=3D1048576kB [ 30.988448] Node 0 hugepages_total=3D0 hugepages_free=3D0 hugepages_surp= =3D0 hugepages_size=3D2048kB [ 30.988472] 11692 total pagecache pages [ 30.988483] 2568 pages in swap cache [ 30.988494] Free swap =3D 891356kB [ 30.988505] Total swap =3D 1048572kB [ 30.988516] 72535 pages RAM [ 30.988524] 0 pages HighMem/MovableOnly [ 30.988535] 18876 pages reserved [ 30.988546] 0 pages cma reserved [ 30.988557] 0 pages hwpoisoned [ 30.988768] Memory allocations (profiling is currently turned on): [ 30.988789] 38.4 MiB 5505 mm/slub.c:3075 func:alloc_slab_page [ 30.988809] 33.0 MiB 8448 drivers/block/xen-blkfront.c:322 [xen_= blkfront] func:fill_grant_buffer [ 30.988834] 31.9 MiB 7943 mm/readahead.c:189 func:ractl_alloc_fo= lio [ 30.988852] 16.0 MiB 4096 drivers/xen/balloon.c:445 func:decreas= e_reservation [ 30.988873] 15.9 MiB 4064 drivers/media/common/videobuf2/videobu= f2-vmalloc.c:47 [videobuf2_vmalloc] func:vb2_vmalloc_alloc [ 30.988905] 11.4 MiB 2924 mm/swap_state.c:439 func:__read_swap_c= ache_async [ 30.988926] 10.5 MiB 2904 mm/execmem.c:41 func:execmem_vmalloc [ 30.988944] 7.36 MiB 116 security/apparmor/policy_unpack.c:1361= func:compress_zstd [ 30.988966] 5.70 MiB 171 security/apparmor/policy_unpack.c:689 = func:unpack_perms_table [ 30.989002] 5.57 MiB 1427 mm/memory.c:1191 func:folio_prealloc --=20 Best Regards, Marek Marczykowski-G=C3=B3recki Invisible Things Lab --//6XU5Z0NrL/kxgj Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAmm9VI4ACgkQ24/THMrX 1yxduwf/YmHCA3W4ZxuHTfGjJ+xLZldvXmp4F67FR6irIq/s0eeI58GvdyDNOW7O KEw2Hh/3g+tkjOW9aEI7uJHmY4X9BEJdULUqm9du41JYw2xo2mKpdnlXPRmDmvux svbR0nCm7784jx65aXr8HugqXB27ZPLUZSFRo3e2TuS9svTSZH0yxLxb+SX0Y7BF DRuLX6YOSpHiXJsuPgsP8vFF8JRHwmB5RJDySnKwXGr9331D6VEWRPTZbnvVzqDc Do6i3KyOx+ZNcZT6dKw0AS888tHciCY2e18j0+/ThAPySCPSUjAHj6SB6ucmy1dv YSDsXeAhwXKj8glNM2ltyvWTgNQo6w== =Z7xE -----END PGP SIGNATURE----- --//6XU5Z0NrL/kxgj--