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hypervisor: 0.880
mistranslation: 0.877
user-level: 0.863
risc-v: 0.862
permissions: 0.859
TCG: 0.854
x86: 0.850
graphic: 0.850
peripherals: 0.847
virtual: 0.844
KVM: 0.841
register: 0.840
i386: 0.828
arm: 0.828
semantic: 0.824
assembly: 0.823
debug: 0.820
performance: 0.817
vnc: 0.811
device: 0.809
architecture: 0.809
ppc: 0.804
PID: 0.794
VMM: 0.794
files: 0.788
socket: 0.755
network: 0.701
kernel: 0.700
boot: 0.698
qemu hangs in pselect syscall
I'm using git commit d75aa4372f0414c9960534026a562b0302fcff29 (v2.7.0-rc4) configured with;
--enable-linux-user \
--disable-system \
--disable-tools \
--disable-guest-agent \
--static --disable-linux-aio \
--disable-fdt \
--without-pixman \
--disable-blobs \
Stable version (v2.6.0) also have the same problem.
In a chroot environment I ran below command-line to compile some things, different sources each time.
/usr/bin/qemu-arm -0 /usr/bin/edje_cc /usr/bin/edje_cc -id /home/abuild/rpmbuild/BUILD/org.tizen.browser-1.6.2/services/SimpleUI/images_mob/ -DBROWSER_RESOLUTION_720x1280=1 -DPROFILE_MOBILE=1 /home/abuild/rpmbuild/BUILD/org.tizen.browser-1.6.2/services/SimpleUI/edc/TextPopup_mob.edc /home/abuild/rpmbuild/BUILD/org.tizen.browser-1.6.2/build-tizen/services/SimpleUI/720x1280_TextPopup.edj
Here is back trace with gdb;
#0 safe_syscall_end () at /usr/src/debug/qemu-2.6.94/linux-user/host/i386/safe-syscall.inc.S:78
#1 0x60049370 in safe_pselect6 (nfds=10, readfds=0xffa31b5c, writefds=0xffa31bdc, exceptfds=0xffa31c5c, timeout=0x0, sig=0x0)
at /usr/src/debug/qemu-2.6.94/linux-user/syscall.c:855
#2 0x6004b2fe in do_select (n=10, rfd_addr=1082122232, wfd_addr=1082122360, efd_addr=1082122488, target_tv_addr=0)
at /usr/src/debug/qemu-2.6.94/linux-user/syscall.c:1386
#3 0x6005e5ba in do_syscall (cpu_env=0x640d0454, num=142, arg1=10, arg2=1082122232, arg3=1082122360, arg4=1082122488, arg5=0, arg6=1087473216, arg7=0,
arg8=0) at /usr/src/debug/qemu-2.6.94/linux-user/syscall.c:9690
#4 0x60045def in cpu_loop (env=0x640d0454) at /usr/src/debug/qemu-2.6.94/linux-user/main.c:876
#5 0x60047640 in main (argc=10, argv=0xffa33c84, envp=0xffa33cb0) at /usr/src/debug/qemu-2.6.94/linux-user/main.c:4817
Attached core file taken from gdb. To see the stack frame, you could try;
$ tar -xf reproduced_118_04.tar.bz2; gdb --core core.1823 qemu-arm
And recent strace log for PID 1823(stucked one);
79965 [ 313s] 1823 :0x8e _newselect(10,[9,3,],[],[],NULL)
79966 [ 313s] ==>[pselect6(0xa)=]
79967 [ 313s] [pselect6=0x1]<==
79968 [ 313s] 1823 :0x8e _newselect(10,[9,],[],[],NULL)
79969 [ 313s] 1823 :0x8e => = 0x00000001 ([9,],[],[],NULL)
79970 [ 313s] 1823 :0xfc epoll_wait(3,1082121456,32,0,1082121456,3)
79971 [ 313s] 1823 :0xfc epoll_wait(3,1082121456,32,0,1082121456,3)
79972 [ 313s] 1823 :0xfc => = 0
79973 [ 313s] 1823 :0x3 read(9,0x407fdeec,16)
79974 [ 313s] 1823 :0x3 read(9,0x407fdeec,16)
79975 [ 313s] 1823 :0x3 => = 8
79976 [ 313s] 1823 :0x107 clock_gettime(1,1082122120,0,1082829144,1082827588,0)
79977 [ 313s] 1823 :0x107 clock_gettime(1,1082122120,0,1082829144,1082827588,0)
79978 [ 313s] 1823 :0x107 => = 0
79979 [ 313s] 1823 :0x8e _newselect(10,[9,3,],[],[],NULL)
79980 [ 313s] ==>[pselect6(0xa)=]
I'm using 64-bit Ubuntu with kernel release Linux 3.19.0-25-generic #26~14.04.1-Ubuntu.
Reproducibility is low. One occurrence out of 50+ trials.
FYI, adding a build log with strace enabled.
Can you provide sufficient instructions for me to reproduce this on my machine, please?
Second part of scratch.armv7l.0.tar.gz.
Third part of scratch.armv7l.0.tar.gz.
Dear Peter.
Thank you for the update.
Please find the attached full chroot environment that I used(scratch.armv7l.0.tar.gz, split three parts).
You could try make build with below steps;
$ sudo su
$ echo -1 > /proc/sys/fs/binfmt_misc/arm
$ echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfa\xff\xff\xff:/usr/bin/qemu-arm-static:' > /proc/sys/fs/binfmt_misc/register
$ cat scratch.armv7l.0.tar.gz.a* > scratch.armv7l.0.tar.gz; sudo tar -zxf scratch.armv7l.0.tar.gz
$ cd scratch.armv7l.0
$ chroot .
chroot> cd /home/abuild/rpmbuild/BUILD/org.tizen.browser-1.6.2/build-tizen/services/
chroot> while :; do make clean; make -j32; done
Reproducibility is ver low but it surely happened.
Thanks.
I can't reproduce this with current git master, and I know we fixed a lot of race conditions in linux-user. So I'm going to close this bug -- if it's still a problem for you with new QEMU, please reopen, preferably with a repro case that's more frequent than 1-in-50-or-less.
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