When I test the USB camera test,it appears the following phenomenon.
root:/> ffmpeg -f video4linux2 -r 5 -s 320x240 -i /dev/video0 -vcodec mpeg4 -f m
p4 usb_camera.mp4
ffmpeg: page allocation failure: order:13, mode:0xd0
Hardware Trace:
0 Target : <0x0027dd60> { _dump_stack + 0x0 }
Source : <0x00048348> { _warn_alloc_failed + 0x78 } CALL pcrel
1 Target : <0x00048348> { _warn_alloc_failed + 0x78 }
Source : <0x0027df70> { _printk + 0x1c } RTS
2 Target : <0x0027df6c> { _printk + 0x18 }
Source : <0x0002af5c> { _vprintk_default + 0x1c } RTS
3 Target : <0x0002af58> { _vprintk_default + 0x18 }
Source : <0x0002ae4c> { _vprintk_emit + 0x21c } RTS
4 Target : <0x0002ae42> { _vprintk_emit + 0x212 }
Source : <0x0002ae52> { _vprintk_emit + 0x222 } JUMP.S
5 Target : <0x0002ae52> { _vprintk_emit + 0x222 }
Source : <0x00029d6a> { _wake_up_klogd + 0x3e } RTS
6 Target : <0x00029d66> { _wake_up_klogd + 0x3a }
Source : <0x000407f0> { _irq_work_queue + 0x68 } RTS
7 Target : <0x000407e8> { _irq_work_queue + 0x60 }
Source : <0x000f50f0> { _llist_add_batch + 0x44 } RTS
8 Target : <0x000f50ea> { _llist_add_batch + 0x3e }
Source : <0x000f50d0> { _llist_add_batch + 0x24 } IF CC JUMP pcrel
9 Target : <0x000f50c4> { _llist_add_batch + 0x18 }
Source : <0x000f50e8> { _llist_add_batch + 0x3c } JUMP.S
10 Target : <0x000f50d8> { _llist_add_batch + 0x2c }
Source : <0x000f50c2> { _llist_add_batch + 0x16 } JUMP.S
11 Target : <0x000f50ac> { _llist_add_batch + 0x0 }
Source : <0x000407e4> { _irq_work_queue + 0x5c } JUMP.L
12 Target : <0x000407d0> { _irq_work_queue + 0x48 }
Source : <0x000407b4> { _irq_work_queue + 0x2c } IF CC JUMP pcrel
13 Target : <0x000407a8> { _irq_work_queue + 0x20 }
Source : <0x000407ce> { _irq_work_queue + 0x46 } JUMP.S
14 Target : <0x000407c2> { _irq_work_queue + 0x3a }
Source : <0x000407a6> { _irq_work_queue + 0x1e } JUMP.S
15 Target : <0x00040788> { _irq_work_queue + 0x0 }
Source : <0x00029d62> { _wake_up_klogd + 0x36 } CALL pcrel
CPU: 0 PID: 541 Comm: ffmpeg Not tainted 4.0.0-ADI-2014R1-pre-00477-g0663a14 #2
Stack info:
SP: [0x02067c68] <0x02067c68> / kernel dynamic memory /
FP: (0x02067c60)
Memory from 0x02067c60 to 02068000
02067c60:(02067c68)<0027df6c>[00000000] 0004834c 00000000 000000d0 ffffe000 00f96358
02067c80: 0000000d 000000d0 000486e2 02066000 02067ce4 0004870a 00000000 00000000
02067ca0: 00000010 0000000d 000000d0 0000000d 00000040 00000000 00c0d000 02066008
02067cc0: 02066000 02066008 02066000 00000050 00000040 00002000 00000000 00000040
02067ce0: 00000000 003b1ad4 00000000 003b11a4 00000000 00000000 00000001 00000000
02067d00: 00000000 00048950 002cb61c 00f35928 00f348c8 0000000d 02000000 00000000
02067d20: 00000001 00100100 00200200 00f96100 00000000 000489d4 002cb61c 00f35928
02067d40: 00f348c8 00055440 00002000 02000000 0026e200 00000001 00000000 00000000
02067d60: 02067d80 0027e452 00000000 000010d8 010d8000 00100100 00200200 010d8000
02067d80: 00050694 002cb61c 00c0d000 00395db0 00000000 00f32654 00000000 010d8000
02067da0: 003b1ad8 0005e7d8 02066000 00000007 00000002 00000000 02067dbc 00000000
02067dc0: 00089916 0005d41c 00669116 00667fd0 0026e200 00000000 00000000 00000000
02067de0: 00000007 00000002 00000000 00000000 00000000 00000000 00000000 00000000
02067e00: 02066000 0000000e 00000008 544c4662 00000004 00017507 c0008000 c0e2a600
02067e20: 90620d01 00000001 00667fd0 008000c0 01000000 60985055 0001ff19 00000000
02067e40: 00001146 010d73da 00000000 00000000 00000000 00000000 00000000 00000000
02067e60: 00000000 80000040 00c0d002 <0005e116> 00396198 00c0d000 00395db0 fffffff8
02067e80: 00000001 02077000 02066000 0001f000 003b7b18 0005ec36 003b7b18 0005ec62
02067ea0: 00f96100 00c0d000 0000021d 00000000 00000000 0005ed94 003b7b18 00c0d000
02067ec0: 020a3fef 00f962d0 00000000 00a93b38 0005ed8c 0005ed94 0000000b 00a86884
02067ee0: 003b7b18 ffffe000 020a3fef 003b7b18 003b7b18 00000000 <ffa0077a> 003b75b8
02067f00: 00000000 <ffa0077a> 00000000 00f978a0 00000000 00000000 c0000000 003b7b18
02067f20: 020a3fef 00a032f6 00008000 00002000 00000000 02068000 00a032f6 00a032f6
02067f40: 00a182b8 ffa00e94 02002000 00a0f21b 00a0efc9 00a0f1d8 00a0efc6 00000000
02067f60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
02067f80: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
02067fa0: 00000000 00000000 00000000 ffffffff 00a93fd3 00a93b2c 00a93b38 00a93fdb
02067fc0: 00a86884 00a86884 020a3ff8 00000fff 0000000b 00000009 00a93fd3 020a3fef
02067fe0: 003b7b18 c0000000 003b75b8 003b7b18 020a3fef 020a3fef 0000000b 00000006
Return addresses in stack:
frame 1 : <0x0027df6c> { _printk + 0x18 }
address : <0x0005e116> { _search_binary_handler + 0x52 }
address : <0xffa0077a> { _system_call + 0x6a }
address : <0xffa0077a> { _system_call + 0x6a }
Mem-Info:
DMA per-cpu:
CPU 0: hi: 0, btch: 1 usd: 0
active_anon:0 inactive_anon:0 isolated_anon:0
active_file:0 inactive_file:0 isolated_file:0
unevictable:4544 dirty:0 writeback:0 unstable:0
free:7760 slab_reclaimable:452 slab_unreclaimable:384
mapped:0 shmem:0 pagetables:0 bounce:0
free_cma:0
DMA free:31040kB min:4096kB low:5120kB high:6144kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:1s
lowmem_reserve[]: 0 0 0
DMA: 544kB (U) 58kB (U) 216kB (U) 132kB (U) 264kB (U) 1128kB (U) 1256kB (U) 1512kB (U) 11024kB (U) 22048kB (UM) 24096kB (B
4544 total pagecache pages
15872 pages RAM
0 pages HighMem/MovableOnly
1100 pages reserved
nommu: Allocation of length 17661952 from process 541 (ffmpeg) failed
DMA per-cpu:
CPU 0: hi: 0, btch: 1 usd: 0
active_anon:0 inactive_anon:0 isolated_anon:0
active_file:0 inactive_file:0 isolated_file:0
unevictable:4544 dirty:0 writeback:0 unstable:0
free:7760 slab_reclaimable:452 slab_unreclaimable:384
mapped:0 shmem:0 pagetables:0 bounce:0
free_cma:0
DMA free:31040kB min:4096kB low:5120kB high:6144kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:1s
lowmem_reserve[]: 0 0 0
DMA: 544kB (U) 58kB (U) 216kB (U) 132kB (U) 264kB (U) 1128kB (U) 1256kB (U) 1512kB (U) 11024kB (U) 22048kB (UM) 24096kB (B
4544 total pagecache pages
Unable to allocate RAM for process text/data, errno 12</ffa0077a></ffa0077a>
