bin/52932: tests hang on netbsd-8

[Manuel.Bouyer%lip6.fr@localhost]

>Number:         52932
>Category:       bin
>Synopsis:       tests hang on netbsd-8
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 17 17:55:00 +0000 2018
>Originator:     Manuel Bouyer
>Release:        NetBSD 8.0_BETA
>Organization:
>Environment:
System: NetBSD 8.0_BETA
Architecture: x86_64, i386, sparc at last
>Description:
	As shown at
	http://www-soc.lip6.fr/~bouyer/NetBSD-tests/qemu/netbsd-8/
	for several weeks now, and up to 201801120300Z, running tests on
	the netbsd-8 branch from anita consistently hang at:
[...]
lib/libc/sys/t_ptrace_wait (273/721): 81 test cases
    attach3: [0.111435s] Passed.
    attach4: [0.098737s] Passed.
    eventmask1: [0.103849s] Passed.
    eventmask2: [0.101645s] Passed.
    eventmask3: sorry, pid 17367 was killed: orphaned traced process
[0.096996s] Expected failure: PR kern/51630: /usr/src/tests/lib/libc/sys/t_ptrace_wait.c:1122: ptrace(PT_SET_EVENT_MASK, child, &set_event, len) != -1 not met
    eventmask4: [0.092491s] Passed.
    eventmask5: [0.102978s] Passed.
    eventmask6: [0.103471s] Passed.
    fork2: [0.121065s] Passed.
    fpregs1: [0.091827s] Passed.
    fpregs2: [0.103025s] Passed.
    getsigmask1: [0.095784s] Passed.
    getsigmask2: [0.091091s] Passed.
    io_read_auxv1: [0.113325s] Passed.
    io_read_d1: [0.090043s] Passed.
    io_read_d2: [0.099908s] Passed.
    io_read_d3: [0.101111s] Passed.
    io_read_d4: [0.094436s] Passed.
    io_read_d_write_d_handshake1: [0.101792s] Passed.
    io_read_d_write_d_handshake2: [0.096378s] Passed.
    io_read_i1: [0.102845s] Passed.
    io_read_i2: [0.099814s] Passed.
    io_read_i3: [0.090768s] Passed.
    io_read_i4: [0.096865s] Passed.
    io_write_d1: [0.100540s] Passed.
    io_write_d2: [0.100000s] Passed.
    io_write_d3: [0.097249s] Passed.
    io_write_d4: [0.094930s] Passed.
    kill1: [0.081539s] Passed.
    kill2: [0.097514s] Passed.
    lwp_create1: [0.116340s] Passed.
    lwp_exit1: [0.117504s] Passed.
    lwpinfo1: [0.096785s] Passed.
    read_d1: [0.103719s] Passed.
    read_d2: [0.103068s] Passed.
    read_d3: [0.104957s] Passed.
    read_d4: [0.101519s] Passed.
    read_d_write_d_handshake1: [0.098761s] Passed.
    read_d_write_d_handshake2: [0.098112s] Passed.
    read_i1: [0.110516s] Passed.
    read_i2: [0.098445s] Passed.
    read_i3: [0.104074s] Passed.
    read_i4: [0.100000s] Passed.
    regs1: [0.098383s] Passed.
    regs2: [0.102669s] Passed.
    regs3: [0.097452s] Passed.
    regs4: [0.098211s] Passed.
    regs5: [0.100004s] Passed.
    resume1: sorry, pid 16196 was killed: orphaned traced process

    from here, no progress is made, and anita times out.
    The last succesfull run on i386 was 2017-12-09

    Interestingly, running the tests on Xen succeeds, but this may be because
    ptrace has other issues with Xen (here resume1 fails with an expected
    timeout: PR kern/51995)
    
>How-To-Repeat:
	run anita with a qemu vmm.
>Fix:
	please