Date: Fri, 28 Dec 2018 00:16:48 -0800 From: Mark Millard <marklmi@yahoo.com> To: freebsd-emulation@freebsd.org, FreeBSD Current <freebsd-current@freebsd.org>, ports-list freebsd <freebsd-ports@freebsd.org> Cc: freebsd-arm <freebsd-arm@freebsd.org>, FreeBSD Toolchain <freebsd-toolchain@freebsd.org> Subject: Re: A reliable port cross-build failure (hangup) in my context (amd64->armv7 cross build, with native-tool speedup involved) Message-ID: <3946C94A-FCA6-49FE-ADDB-B042BBE50913@yahoo.com> In-Reply-To: <5C3F09FE-EA50-452D-98EE-364B7BF3ECD0@yahoo.com> References: <FF9B4284-4E6B-4D36-86A0-18861B527AC0@yahoo.com> <865A13C8-9749-486E-9F79-5EEDDECBE621@yahoo.com> <0154C3AC-D85B-4FCF-BA63-454BC26BC1A2@yahoo.com> <5C3F09FE-EA50-452D-98EE-364B7BF3ECD0@yahoo.com>
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[The historical notes are removed and replaced by partial trace
information from example hang-ups, not that I've figured out
what contributes yet.]
I ran into the following while trying to get evidence
about the hang-up for an amd64->armv7 cross-build of
multimedia/gstreamer1-qt@qt5 .
The following from trying to get evidence for the hang-up
via a manual run of "make multimedia/gstreamer1-qt FLAVOR=3Dqt5=E2=80=9D
in a poudriere bulk -i=E2=80=99s interactive mode for the context
that has the hang-up in normal poudriere-devel runs.
=46rom top after the hang-up (to identify some context):
14528 root 2 52 0 100M 24M 0 kqread 11 0:00 =
0.00% /usr/local/bin/qemu-arm-static /usr/local/bin/cmake -E =
cmake_autogen /wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.
14527 root 2 52 0 88M 13M 0 select 22 0:00 =
0.00% /usr/local/bin/qemu-arm-static ninja -j1 -v all
from ps -auxd as well (to identify more context):
root 10114 0.0 0.0 10328 1756 1 I+J 13:47 0:00.01 | =
`-- make FLAVOR=3Dqt5
root 14526 0.0 0.0 10204 1792 1 I+J 13:50 0:00.00 | =
`-- /bin/sh -e -c (cd =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build; if ! =
/usr/bin/env QT_SELE
root 14527 0.0 0.0 90304 13084 1 I+J 13:50 0:00.09 | =
`-- /usr/local/bin/qemu-arm-static ninja -j1 -v all
root 14528 0.0 0.0 102876 25060 1 IJ 13:50 0:00.12 | =
`-- /usr/local/bin/qemu-arm-static =
/usr/local/bin/cmake -E cmake_autogen /wrkdirs/usr/ports/multimedia/g
I had made a qemu-user-static that enabled do_strace when
it is used to run cmake or ninja.
The only do_strace lines from qemu-arm-static running cmake
or ninja mentioning process 14528 are included in the sequence:
(Before the below was a long list of "14527 fstatat=E2=80=9D lines.
I=E2=80=99ll note that "'Unknown syscall 545=E2=80=9D is from ppoll =
use.)
82400 sigprocmask(1,-1610620016,-191968524,-186261416,0,24) =3D 0
82400 sigaction(2,-1610620040,-191968596,-186261584,210460,0) =3D 0
82400 sigaction(15,-1610620040,-191968572,-186261584,210460,0) =3D 0
82400 sigaction(1,-1610620040,-191968548,-186261584,210460,0) =3D 0
82400 gettimeofday(-1610619984,0,4,-186261584,-1610619440,-1610619528) =3D=
0
82400 gettimeofday(-1610619984,0,4,359949,1545969996,0) =3D 0
82400 gettimeofday(-1610620120,0,4,2,-184666112,-1610619520) =3D 0
82400 fstatat(-100,"elements/gstqtvideosink/CMakeFiles", 0x9fffe200, 0) =
=3D 0
82400 fstatat(-100,"elements/gstqtvideosink/gstqt5videosink_autogen", =
0x9fffe200, 0) =3D 0
82400 pipe2(-1610620176,0,-1610620108,0,-1610620120,167084) =3D 0
82400 fcntl(5,1,-1610620108,-185863932,-192200556,-1610620228) =3D 0
82400 fcntl(5,2,1,-185863932,-192200556,-1610620228) =3D 0
82400 vfork(0,66450,-186876196,-1610620184,-1610620240,0) =3D 82401
82400 close(6) =3D 0
=3D 0
82400 Unknown syscall 545
82401 setpgid(0,0,-186876196,-1610620184,-1610620240,0) =3D 0
82401 sigprocmask(3,-191586912,0,-1610620184,-1610620240,0) =3D 0
82401 close(5) =3D 0
82401 open("/dev/null",0,0) =3D 5
82401 dup2(5,0,0,-1610620184,-1610620240,0) =3D 0
82401 close(5) =3D 0
82401 fcntl(0,2,0,-1610620184,-1610620240,0) =3D 0
82401 dup2(6,1,0,-1610620184,-1610620240,0) =3D 1
82401 fcntl(1,2,0,-1610620184,-1610620240,0) =3D 0
82401 dup2(6,2,0,-1610620184,-1610620240,0)82400 =
sigpending(-1610620072,1,0,-191968524,0,0) =3D 0
The vfork then close(6) sequence for 82400 vs. the later
use of 6 in dup2 in 82401 may be rather odd. But it looks
like qemu-*-static uses do_freebsd_fork to implement
do_freebsd_vfork, despite reporting vfork before
calling do_freebsd_vfork. (Does the close(6) appear to
indicate a race for native operation of ninja for the
period when the address space is shared?)
Ninja has Subprocess::Start code that has:
#ifdef POSIX_SPAWN_USEVFORK
flags |=3D POSIX_SPAWN_USEVFORK;
#endif
if (posix_spawnattr_setflags(&attr, flags) !=3D 0)
Fatal("posix_spawnattr_setflags: %s", strerror(errno));
const char* spawned_args[] =3D { "/bin/sh", "-c", command.c_str(), =
NULL };
if (posix_spawn(&pid_, "/bin/sh", &action, &attr,
const_cast<char**>(spawned_args), environ) !=3D 0)
Fatal("posix_spawn: %s", strerror(errno));
that is in use here. I think that this explains the vfork use.
It turns out that putting the hung-up build in the background
and then killing 82401 with the likes of kill -6 leads to more
output that had apparently been buffered. It shows the use of
the (amd64 native) /bin/sh that in turn leads to
/usr/local/bin/cmake via qemu-arm-static. /bin/sh, being
native, gets no do_strace output from qemu-arm-static.
82400 sigpending(-1610620072,1,0,-191968524,0,0) =3D 0
82400 read(5,0x9fffd368,4096) =3D 58
82400 Unknown syscall 545
82400 sigpending(-1610620072,1,0,-191968524,0,0) =3D 0
82400 read(5,0x9fffd368,4096) =3D 0
82400 close(5) =3D 0
82400 wait4(82401,-1610620004,0,0,-191968640,0) =3D 82401
82400 mmap(0,86016,3,201330690,-1,-1610620169) =3D 0xf4777000
82400 gettimeofday(-1610620224,0,4,-1610619944,31,16777216) =3D 0
82400 write(1,0xf4950000,283)[1/129] cd =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink && /usr/local/bin/cmake -E cmake_autogen =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink/CMakeFiles/gstqt5videosink_autogen.dir/AutogenInfo.cmake Debug
=3D 283
82400 write(1,0xf4950000,137)FAILED: =
elements/gstqtvideosink/CMakeFiles/gstqt5videosink_autogen =
elements/gstqtvideosink/gstqt5videosink_autogen/mocs_compilation.cpp=20
=3D 137
82400 write(1,0xf4950000,275)cd =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink && /usr/local/bin/cmake -E cmake_autogen =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink/CMakeFiles/gstqt5videosink_autogen.dir/AutogenInfo.cmake Debug
=3D 275
82400 write(1,0xf4950000,5) =3D 2
=3D 5
(Note that some 82400 writes are reporting 82401 information:)
82400 write(1,0xf4950000,49)82401 fcntl(2,2,0,-1610620184,-1610620240,0) =
=3D 0
=3D 49
82400 write(1,0xf4950000,19)82401 close(6) =3D 0
=3D 19
82400 write(1,0xf4950000,401)82401 execve("/bin/sh",{"/bin/sh","-c","cd =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink && /usr/local/bin/cmake -E cmake_autogen =
/wrkdirs/usr/ports/multimedia/gstreamer1-qt/work-qt5/.build/elements/gstqt=
videosink/CMakeFiles/gstqt5videosink_autogen.dir/AutogenInfo.cmake =
Debug",NULL})82401 __sysctl({ 0 3 }, 2, 0x9fffda80, 0x9fffdf64, =
0xf5002097, 0x0000000c) =3D 0
=3D 401
(The /bin/sh activity is not logged: /bin/sh is native amd64 code here. =
The
below is from the later /usr/local/bin/cmake via qemu-arm-static.
. . . (much omitted) . . .
82400 write(1,0xf4950000,60)82401 =
mmap(0,28672,3,201330690,-1,-1610621989) =3D 0xf41a0000
=3D 60
82400 write(1,0xf4950000,74)82401 =
clock_gettime(4,-1610621832,4,-199622492,-199622492,-199622656) =3D 0
=3D 74
82400 write(1,0xf4950000,62)82401 =
kqueue(-199622656,0,53102,0,-199622656,-1610621444) =3D 3
=3D 62
82400 write(1,0xf4950000,81)82401 ioctl(3, 0x20006601 { IO GRP:0x66('f') =
CMD:1 LEN:0 }, 0x0000cf6e, ...) =3D 0
=3D 81
. . . (some omitted) . . .
(Then there is a fairly long sequence of access's and then a sequence of
fstatat's just before:)
82400 write(1,0xf4950000,32)82401 write(9,0xf4e1a945,1) =3D 1
=3D 32
82400 write(1,0xf4950000,61)82401 =
clock_gettime(4,-1610622624,4,100863,1,-199483392) =3D 0
=3D 61
82400 write(1,0xf4950000,106)82401 =
kevent(3,-1610688200,2,-1610688200,1024,0)qemu: uncaught target signal 6 =
(Abort trap) - core dumped
=3D 106
82400 write(1,0xf4950000,41)ninja: build stopped: subcommand failed.
=3D 41
So it was hung at the kevent until the kill -6 .
Via another experiment ninja was at the time waiting
in ppoll:
Reading symbols from ninja...done.
[New LWP 73023]
Core was generated by `ninja'.
Program terminated with signal SIGABRT, Aborted.
#0 0xf4e5e0dc in _ppoll () from /lib/libc.so.7
(gdb) bt
#0 0xf4e5e0dc in _ppoll () from /lib/libc.so.7
#1 0x00033bf0 in SubprocessSet::DoWork (this=3D<optimized out>) at =
src/subprocess-posix.cc:237
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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