net/http: TestLinuxSendfile failing on mips64

[bcmills]

linux-mips64-rtrk (https://build.golang.org/log/08c75d4dfe5a50784afe5f032e5510cdc2e4ec8f):

--- FAIL: TestLinuxSendfile (0.37s)
    fs_test.go:1165: no sendfile system call found in:
        [pid 11110] +++ exited with 0 +++
        [pid 11106] +++ exited with 0 +++
        [pid 11109] +++ exited with 0 +++
        [pid 11108] +++ exited with 0 +++
        [pid 11107] +++ exited with 0 +++
        +++ exited with 0 +++
FAIL
FAIL	net/http	19.315s

See previously #18008.

CC @bradfitz @cherrymui @bogojevic @milanknezevic

[cherrymui]

Does the builder has 64-bit user space? As seen in #18008, the strace command that is not using 64-bit ABI may not work.

[milanknezevic]

@cherrymui The builder has 32-bit user space.

[milanknezevic]

@cherrymui @bradfitz The solution could be to modify the test to check if "n64:sendfile" syscall is used on mips64. Is that ok?

[cherrymui]

I think I tried that in #18008 (comment)

That was a few years ago. Things may be different now.

[gopherbot]

Change https://golang.org/cl/206178 mentions this issue: net/http: relax TestLinuxSendfile, trace all system calls, match n64:sendfile

[cherrymui]

Ok, apparently now we no longer match the arguments, so this may work.