http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59436
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |hjl.tools at gmail dot com --- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> --- The bad run has open("x86_64-unknown-linux-gnu/bits/stdc++.h.gch/O2ggnu++0x.gch", O_RDONLY|O_NOCTTY) = 5 fstat(5, {st_mode=S_IFREG|0644, st_size=78195440, ...}) = 0 read(5, "gpch+014l\272\361U\305\242H\350\25\237\343\320\316\t\376\323", 24) = 24 read(5, "\3\1\0\0\0\0\0\0\200\367x\0\0\0\0\0\340\0\0\0\0\0\0\0", 24) = 24 ... read(5, "r\5\0\20\0\0\0\340r\5\0\20\0\0\0\340r\5\0\20\0\0\0\340r\5\0\20\0\0\0\340"..., 4096) = 4096 read(5, "v\5\0\20\0\0\0p\236L\2\20\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 4096) = 4096 mmap(0x1000000000, 77393920, PROT_READ|PROT_WRITE, MAP_PRIVATE, 5, 0xc1000) = 0x1000000000 ... The good runs don't do mmap on PCH file.