I just saw this, it doesn't seem to be reproducible:

...
ok net 0.855s
--- FAIL: TestLinuxSendfile (0.05 seconds)
fs_test.go:415: no sendfile system call found in:

execve("/tmp/go-build078447519/net/http/_test/http.test", ["/tmp/go-build078447519/net/http/"..., "-test.run=TestLinuxSendfileChild"], [/* 28 vars */]) = 0
brk(0) = 0x37d5000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0b32000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=89427, ...}) = 0
mmap(NULL, 89427, PROT_READ, MAP_PRIVATE, 4, 0) = 0x7ff0f0b1c000
close(4) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY) = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0Pl\0\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0755, st_size=135500, ...}) = 0
mmap(NULL, 2212920, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7ff0f06f7000
mprotect(0x7ff0f070f000, 2093056, PROT_NONE) = 0
mmap(0x7ff0f090e000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x17000) = 0x7ff0f090e000
mmap(0x7ff0f0910000, 13368, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0910000
close(4) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY) = 4
read(4, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \24\2\0\0\0\0\0"..., 832) = 832
fstat(4, {st_mode=S_IFREG|0755, st_size=1677624, ...}) = 0
mmap(NULL, 3793768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) = 0x7ff0f0358000
mprotect(0x7ff0f04ed000, 2093056, PROT_NONE) = 0
mmap(0x7ff0f06ec000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x194000) = 0x7ff0f06ec000
mmap(0x7ff0f06f1000, 21352, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7ff0f06f1000
close(4) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0b1b000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0b19000
arch_prctl(ARCH_SET_FS, 0x7ff0f0b19720) = 0
mprotect(0x7ff0f06ec000, 16384, PROT_READ) = 0
mprotect(0x7ff0f090e000, 4096, PROT_READ) = 0
mprotect(0x7ff0f0b34000, 4096, PROT_READ) = 0
munmap(0x7ff0f0b1c000, 89427) = 0
set_tid_address(0x7ff0f0b199f0) = 18947
set_robust_list(0x7ff0f0b19a00, 0x18) = 0
futex(0x7fff1c572f5c, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7fff1c572f5c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7ff0f0b19720) = -1 EAGAIN (Resource temporarily unavailable)
rt_sigaction(SIGRTMIN, {0x7ff0f06fd6c0, [], SA_RESTORER|SA_SIGINFO, 0x7ff0f0707060}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7ff0f06fd750, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7ff0f0707060}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
rt_sigaction(SIGHUP, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGINT, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGQUIT, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGILL, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGTRAP, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGABRT, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGBUS, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGFPE, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGUSR1, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGSEGV, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGUSR2, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGPIPE, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGALRM, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGTERM, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGSTKFLT, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGCHLD, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGTSTP, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGTTIN, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGTTOU, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGURG, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGXCPU, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGXFSZ, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGVTALRM, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGPROF, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGWINCH, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGIO, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGPWR, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGSYS, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRTMIN, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_2, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_3, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_4, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_5, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_6, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_7, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_8, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_9, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_10, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_11, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_12, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_13, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_14, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_15, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_16, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_17, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_18, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_19, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_20, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_21, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_22, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_23, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_24, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_25, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_26, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_27, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_28, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_29, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_30, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_31, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
rt_sigaction(SIGRT_32, {0x418ddf, ~[], SA_RESTORER|SA_STACK|SA_RESTART|SA_SIGINFO, 0x418e32}, NULL, 8) = 0
open("/proc/stat", O_RDONLY|O_CLOEXEC) = 4
read(4, "cpu 26751446 35451 8248792 2083"..., 252) = 252
read(4, "62474 84871592 0 0 0 25488807 0 "..., 252) = 252
read(4, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
read(4, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
read(4, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
read(4, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
read(4, " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0"..., 252) = 252
read(4, "\nprocs_blocked 0\nsoftirq 3692063"..., 252) = 108
read(4, "", 252) = 0
close(4) = 0
mmap(0xf800000000, 65536, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf800000000
munmap(0xf800000000, 65536) = 0
mmap(NULL, 131072, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0af9000
mmap(0xf840000000, 1048576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf840000000
mmap(0xf83fff0000, 65536, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf83fff0000
mmap(NULL, 131072, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0ad9000
mmap(NULL, 131072, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0ab9000
sigaltstack({ss_sp=0xf840076000, ss_flags=0, ss_size=32768}, NULL) = 0
mmap(NULL, 1048576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f09b9000
socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 4
bind(4, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP) = 5
bind(5, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::ffff:127.0.0.1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
close(5) = 0
close(4) = 0
open("/proc/sys/net/core/somaxconn", O_RDONLY|O_CLOEXEC) = 4
read(4, "128\n", 1024) = 4
read(4, "", 1020) = 0
close(4) = 0
dup(3) = 4
getsockopt(4, SOL_SOCKET, SO_TYPE, [1], [4]) = 0
getsockname(4, {sa_family=AF_INET, sin_port=htons(51826), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
getpeername(4, 0xf840000850, [112]) = -1 ENOTCONN (Transport endpoint is not connected)
pipe([5, 6]) = 0
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
fcntl(6, F_SETFD, FD_CLOEXEC) = 0
fcntl(5, F_GETFL) = 0 (flags O_RDONLY)
fcntl(5, F_SETFL, O_RDONLY|O_NONBLOCK) = 0
fcntl(6, F_GETFL) = 0x1 (flags O_WRONLY)
fcntl(6, F_SETFL, O_WRONLY|O_NONBLOCK) = 0
epoll_create1(O_CLOEXEC) = 7
epoll_ctl(7, EPOLL_CTL_ADD, 5, {EPOLLIN|0x2000, {u32=5, u64=5}}) = 0
brk(0) = 0x37d5000
brk(0x37f6000) = 0x37f6000
mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7ff0efb57000
mprotect(0x7ff0efb57000, 4096, PROT_NONE) = 0
clone(Process 18948 attached
child_stack=0x7ff0f0356fd0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7ff0f03579d0, tls=0x7ff0f0357700, child_tidptr=0x7ff0f03579d0) = 18948
[pid 18947] fcntl(4, F_GETFL) = 0x2 (flags O_RDWR)
[pid 18947] futex(0x7a3130, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid 18948] set_robust_list(0x7ff0f03579e0, 0x18) = 0
[pid 18948] sigaltstack({ss_sp=0xf8400ae000, ss_flags=0, ss_size=32768}, NULL) = 0
[pid 18948] futex(0x7a3130, FUTEX_WAKE, 1 <unfinished ...>
[pid 18947] <... futex resumed> ) = 0
[pid 18947] fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 18947] accept(4, {sa_family=AF_INET, sin_port=htons(55184), sin_addr=inet_addr("127.0.0.1")}, [16]) = 8
[pid 18947] fcntl(8, F_SETFD, FD_CLOEXEC) = 0
[pid 18947] fcntl(8, F_GETFL) = 0x2 (flags O_RDWR)
[pid 18947] fcntl(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 18947] getsockname(8, {sa_family=AF_INET, sin_port=htons(51826), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
[pid 18947] setsockopt(8, SOL_TCP, TCP_NODELAY, [1], 4) = 0
[pid 18947] mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7ff0ef356000
[pid 18947] mprotect(0x7ff0ef356000, 4096, PROT_NONE) = 0
[pid 18947] clone(Process 18949 attached
child_stack=0x7ff0efb55fd0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7ff0efb569d0, tls=0x7ff0efb56700, child_tidptr=0x7ff0efb569d0) = 18949
[pid 18947] accept(4, 0xf8400009a0, [112]) = -1 EAGAIN (Resource temporarily unavailable)
[pid 18947] futex(0x7a3130, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid 18948] <... futex resumed> ) = 1
[pid 18948] epoll_wait(7, <unfinished ...>
[pid 18949] set_robust_list(0x7ff0efb569e0, 0x18) = 0
[pid 18949] sigaltstack({ss_sp=0xf8400bc000, ss_flags=0, ss_size=32768}, NULL) = 0
[pid 18949] futex(0x7a3130, FUTEX_WAKE, 1 <unfinished ...>
[pid 18947] <... futex resumed> ) = 0
[pid 18947] epoll_ctl(7, EPOLL_CTL_ADD, 4, {EPOLLIN|EPOLLONESHOT|0x2000, {u32=4, u64=4}}) = 0
[pid 18947] futex(0x7a3130, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid 18949] <... futex resumed> ) = 1
[pid 18949] read(8, "GET / HTTP/1.1\r\nHost: 127.0.0.1:"..., 4096) = 93
[pid 18949] open("testdata", O_RDONLY|O_CLOEXEC) = 9
[pid 18949] fstat(9, {st_mode=S_IFDIR|0775, st_size=136, ...}) = 0
[pid 18949] open("testdata/index.html", O_RDONLY|O_CLOEXEC) = 10
[pid 18949] fstat(10, {st_mode=S_IFREG|0664, st_size=22, ...}) = 0
[pid 18949] open("/etc/mime.types", O_RDONLY|O_CLOEXEC) = 11
[pid 18949] read(11, "################################"..., 4096) = 4096
[pid 18949] read(11, "\napplication/whoispp-response\nap"..., 4071) = 4071
[pid 18949] read(11, "lication/vnd.ms-asf\napplication/"..., 4093) = 4093
[pid 18949] read(11, "ml.draw.template\t\t\t\t\t\tstd\napplic"..., 4075) = 4075
[pid 18949] mmap(0xf840100000, 1048576, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf840100000
[pid 18949] mmap(0xf83ffe0000, 65536, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xf83ffe0000
[pid 18949] read(11, "lab\t\t\t\tsci sce\napplication/x-sh\t"..., 4079) = 4079
[pid 18949] read(11, "r\nimage/x-coreldrawpattern\t\t\tpat"..., 4073) = 3544
[pid 18949] read(11, "", 4096) = 0
[pid 18949] close(11) = 0
[pid 18949] open("/etc/apache2/mime.types", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 18949] open("/etc/apache/mime.types", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
[pid 18949] write(8, "HTTP/1.1 200 OK\r\nAccept-Ranges: "..., 184 <unfinished ...>
[pid 18948] <... epoll_wait resumed> {{EPOLLIN, {u32=4, u64=4}}}, 10, -1) = 1
[pid 18948] epoll_ctl(7, EPOLL_CTL_DEL, 4, NULL) = 0
[pid 18948] futex(0x7a3130, FUTEX_WAKE, 1) = 1
[pid 18947] <... futex resumed> ) = 0
[pid 18948] epoll_wait(7, <unfinished ...>
[pid 18947] accept(4, {sa_family=AF_INET, sin_port=htons(55185), sin_addr=inet_addr("127.0.0.1")}, [16]) = 11
[pid 18947] fcntl(11, F_SETFD, FD_CLOEXEC) = 0
[pid 18947] fcntl(11, F_GETFL) = 0x2 (flags O_RDWR)
[pid 18947] fcntl(11, F_SETFL, O_RDWR|O_NONBLOCK) = 0
[pid 18947] getsockname(11, {sa_family=AF_INET, sin_port=htons(51826), sin_addr=inet_addr("127.0.0.1")}, [16]) = 0
[pid 18947] setsockopt(11, SOL_TCP, TCP_NODELAY, [1], 4) = 0
[pid 18947] mmap(NULL, 4096, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0b31000
[pid 18947] mmap(NULL, 8392704, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7ff0eeb55000
[pid 18947] mprotect(0x7ff0eeb55000, 4096, PROT_NONE) = 0
[pid 18947] clone(Process 18950 attached
child_stack=0x7ff0ef354fd0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7ff0ef3559d0, tls=0x7ff0ef355700, child_tidptr=0x7ff0ef3559d0) = 18950
[pid 18947] close(3) = 0
[pid 18947] futex(0x7a3130, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid 18949] <... write resumed> ) = 184
[pid 18949] futex(0xf8400ab368, FUTEX_WAIT, 0, NULL <unfinished ...>
[pid 18950] set_robust_list(0x7ff0ef3559e0, 0x18) = 0
[pid 18950] sigaltstack({ss_sp=0xf8400fa000, ss_flags=0, ss_size=32768}, NULL) = 0
[pid 18950] mmap(NULL, 131072, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7ff0f0999000
[pid 18950] futex(0xf8400ab368, FUTEX_WAKE, 1 <unfinished ...>
[pid 18949] <... futex resumed> ) = 0
[pid 18949] futex(0x7a3130, FUTEX_WAKE, 1 <unfinished ...>
[pid 18947] <... futex resumed> ) = 0
[pid 18947] read(11, "GET /quit HTTP/1.1\r\nHost: 127.0."..., 4096) = 97
[pid 18947] exit_group(0) = ?
FAIL
FAIL net/http 2.837s
ok net/http/cgi 0.324s
ok net/http/fcgi 0.012s