I got another problem, mdadm crashes when copying larger files. Sometimes there is an error at 1GB sometimes 60GB will be transferred fine. I have scanned RAM from u-boot but it is ok.
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[88205.462225] Unable to handle kernel paging request at virtual address ff3723a4
[88205.469432] pgd = c90a4000
[88205.472123] [ff3723a4] *pgd=00000000
[88205.475687] Internal error: Oops: 5 [#1] PREEMPT ARM
[88205.480626] Modules linked in: udf isofs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi usblp usb_storage ehci_orion ehci_hcd
[88205.492425] CPU: 0 PID: 1490 Comm: md0_raid5 Not tainted 4.14.133 #5
[88205.498742] Hardware name: LaCie 5Big Network v2
[88205.503333] task: df4f7980 task.stack: dbfb0000
[88205.507855] PC is at async_copy_data+0x74/0x24c
[88205.512365] LR is at raid_run_ops+0xb74/0x12b8
[88205.516785] pc : [<c04e1c60>] lr : [<c04e7304>] psr: 20000013
[88205.523022] sp : dbfb1cd8 ip : dfad6788 fp : 04000000
[88205.528223] r10: ca34d860 r9 : 00000000 r8 : ca34d860
[88205.533426] r7 : dbfb0000 r6 : 00001000 r5 : dfad6630 r4 : 00000000
[88205.539923] r3 : df5e07bc r2 : ff3723a0 r1 : 30000000 r0 : cf3723a0
[88205.546421] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[88205.553523] Control: 0005317f Table: 090a4000 DAC: 00000055
[88205.559242] Process md0_raid5 (pid: 1490, stack limit = 0xdbfb0190)
[88205.565481] Stack: (0xdbfb1cd8 to 0xdbfb2000)
[88205.569819] 1cc0: 00001000 dbfb1cec
[88205.577962] 1ce0: 00000001 d38747a8 dedec2bc 00000008 df5e07bc 00000000 00000000 00000000
[88205.586101] 1d00: 000001e0 df5e07bc dfad6630 00000001 dbfb0000 ca34d860 dfad6540 000000f0
[88205.594240] 1d20: ce445020 c04e7304 77ec9738 00000001 df5e07bc dfad6540 00000000 dbfb1e00
[88205.602379] 1d40: ce445020 df65cfbc 00000000 de9f3400 77ec9738 00000001 00000005 00000248
[88205.610518] 1d60: dfad6788 00000005 00000005 00000018 de9f3400 de9f3468 00000000 c04f0744
[88205.618658] 1d80: de9f3400 ce445020 dbfb1e00 ce445020 de9f3400 ce445020 ffffffff de9f35e0
[88205.626803] 1da0: 00000000 de9f3468 00000000 c04ec2ac 00000008 00000001 00000000 dfca3560
[88205.634942] 1dc0: 00000005 d5b08020 d5b08470 00000001 00000450 c001b160 ceb7a0c0 00000000
[88205.643081] 1de0: 00000001 df6f46ec 99f3ccd4 00005038 00000000 20000013 dbfb1e24 de9f359c
[88205.651219] 1e00: 00000000 00000000 00000000 00000000 00000005 00000000 00000000 00000004
[88205.659358] 1e20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[88205.667498] 1e40: ffffffff ffffffff 00000000 00000001 00000000 00000018 00000000 00000000
[88205.675637] 1e60: 00000000 00000000 dbfb1e94 de9f3400 00000008 00000002 ffffffff de9f35e0
[88205.683776] 1e80: 00000000 de9f3468 de9f3468 c04eedc0 00000001 00000000 cfc02020 deb79020
[88205.691915] 1ea0: ce445020 cec50aa0 c9704540 cd006000 cec3eaa0 da747540 dbfb0000 de9f3400
[88205.700055] 1ec0: 00000000 dbfb1f18 dbfb0000 00000000 de9f8060 de9f3c00 de9f35e0 c04ef210
[88205.708202] 1ee0: dbfb1f0c c06c30b4 dbfb0000 dbfb1f28 00000000 c0065a38 00000000 00000000
[88205.716340] 1f00: dbfb1f28 c08fce80 00000000 c0065c44 dbfb1f28 40000013 dbfb1f18 dbfb1f18
[88205.724480] 1f20: dbfb1f20 dbfb1f20 dbfb1f28 dbfb1f28 dbfb1f30 dbfb1f30 dbfb1f64 de9f8060
[88205.732626] 1f40: dbfb0000 000001e2 de9f8068 00000000 de9f8060 c04fc144 00000000 c04fc2b8
[88205.740766] 1f60: dbfb0000 00000000 df4f7980 c004bcf8 dbfb1f70 dbfb1f70 df4cbb80 de9f8660
[88205.748904] 1f80: 00000000 de9dfcc4 df4cbb98 c003e738 de9f8660 c003e638 00000000 00000000
[88205.757042] 1fa0: 00000000 00000000 00000000 c0013950 00000000 00000000 00000000 00000000
[88205.765180] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[88205.773319] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[88205.781469] [<c04e1c60>] (async_copy_data) from [<c04e7304>] (raid_run_ops+0xb74/0x12b8)
[88205.789532] [<c04e7304>] (raid_run_ops) from [<c04ec2ac>] (handle_stripe+0x23c/0x29f4)
[88205.797419] [<c04ec2ac>] (handle_stripe) from [<c04eedc0>] (handle_active_stripes+0x35c/0x430)
[88205.805998] [<c04eedc0>] (handle_active_stripes) from [<c04ef210>] (raid5d+0x37c/0x568)
[88205.813967] [<c04ef210>] (raid5d) from [<c04fc2b8>] (md_thread+0x174/0x184)
[88205.820906] [<c04fc2b8>] (md_thread) from [<c003e738>] (kthread+0x100/0x11c)
[88205.827934] [<c003e738>] (kthread) from [<c0013950>] (ret_from_fork+0x14/0x24)
[88205.835123] Code: e3a0100c e001019b e59a0050 e0802001 (e5925004)
[88205.841186] ---[ end trace 0121e80810a57e2c ]---
[88205.846248] note: md0_raid5[1490] exited with preempt_count 1