[Nexus 5 Original Android Development] show-p1984:
Your log shows a l1 cache error on cpu0.

[ 1693.482635] L1 / TLB Error detected on CPU 0!

[ 1693.482696]	CESR = 0x00000001

[ 1693.482788]	CPU speed = 2534400

[ 1693.482837]	MIDR = 0x512f06f0

[ 1693.482890] l2_saw [mem 0xf9012000-0xf901207f]:

[ 1693.482992] 00000000: 00000000 140c086f 00000014 00003000 000a0000 000000e2 00000000 000000e2

[ 1693.483050] 00000020: 00000000 00000000 00000000 00000000 00000001 3c102800 00000000 00000000

[ 1693.483128] 00000040: 02030080 00030000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483200] 00000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483265] krait0_saw [mem 0xf9089000-0xf908907f]:

[ 1693.483309] 00000000: 00000000 120f0867 00000001 0000303b 002f0000 00000000 00000000 00000000

[ 1693.483380] 00000020: 00000000 00000000 00000000 00000000 00000001 3c102800 00000000 00000000

[ 1693.483450] 00000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483491] 00000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483557] krait1_saw [mem 0xf9099000-0xf909907f]:

[ 1693.483627] 00000000: 00000000 120f0867 00000001 0f0701af 002f0000 00000000 00000000 00000000

[ 1693.483668] 00000020: 00000000 00000000 00000000 00000000 00000281 3c102800 00000000 00000000

[ 1693.483738] 00000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483809] 00000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.483874] krait2_saw [mem 0xf90a9000-0xf90a907f]:

[ 1693.483917] 00000000: 00000000 120f0867 00000001 0f0701af 002f0000 00000000 00000000 00000000

[ 1693.483989] 00000020: 00000000 00000000 00000000 00000000 00000281 3c102800 00000000 00000000

[ 1693.484060] 00000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.484103] 00000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.484169] krait3_saw [mem 0xf90b9000-0xf90b907f]:

[ 1693.484212] 00000000: 00000000 120f0867 00000001 0f0701af 002f0000 00000000 00000000 00000000

[ 1693.484284] 00000020: 00000000 00000000 00000000 00000000 00000281 3c102800 00000000 00000000

[ 1693.484356] 00000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.484428] 00000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000

[ 1693.484465] krait0_acs [mem 0xf9088000-0xf908803f]:

[ 1693.484505] 00000000: 00000000 00000080 00010781 00000000 00000000 403f3f7f 00002a39 00000000

[ 1693.484574] 00000020: 00000000 00000000 00000000 00030000 393f3f7f 00008022 00003f3f 00000000

[ 1693.484611] krait1_acs [mem 0xf9098000-0xf909803f]:

[ 1693.484680] 00000000: 00000000 00000080 00080770 00000000 00000000 403f3f7f 00002a39 00000000

[ 1693.484749] 00000020: 00000000 00000000 00000000 00030000 393f0000 00008022 00003f3f 00000000

[ 1693.484785] krait2_acs [mem 0xf90a8000-0xf90a803f]:

[ 1693.484853] 00000000: 00000000 00000080 00080770 00000000 00000000 403f3f7f 00002a43 00000000

[ 1693.484921] 00000020: 00000000 00000000 00000000 00030000 433f0000 00008022 00003f3f 00000000

[ 1693.484957] krait3_acs [mem 0xf90b8000-0xf90b803f]:

[ 1693.485026] 00000000: 00000000 00000080 00080770 00000000 00000000 403f3f7f 00002a3b 00000000

[ 1693.485095] 00000020: 00000000 00000000 00000000 00030000 3b3f0000 00008022 00003f3f 00000000

[ 1693.485129] D-cache tag parity error

[ 1693.485194] D-side CESYNR = 0x0000af42

[ 1693.485231] Kernel panic - not syncing: L1 nonrecoverable cache error detected

Which caused the kernel to panic.

Possible reasons:

1. Too much undervolting. (From your log => acpuclk_set_vdd: user voltage table modified!)

2. Too far under/over clocked

3. Hardware failure

4. A software bug in the original kernel code

In that order.