On Tue, 4 Dec 2018, John Paul Adrian Glaubitz wrote:
> On 12/3/18 8:13 AM, Finn Thain wrote:
> > The problem turns out to be dash. I got things working again by replacing
> > /bin/sh and /bin/dash with symlinks to bash and then running
> > 'apt --fix-broken install' to finish the upgrade.
>
> Thanks for the heads-up! I just ran into this problem with qemu-system but
> not with qemu-user. I wonder whether it's related to [1].
>
It happens in aranym too. I tried strace,
execve("/root/dash", ["/root/dash", "-c", "/bin/echo"], ["PWD=/",
"HOME=/", "BOOT_IMAGE=vmlinux", "TERM=linux", "SHLVL=1",
"_=/usr/bin/strace"]) = 0
[...]
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
get_thread_area() = 0xc0022490
clone(child_stack=NULL,
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=NULL) = 415
wait4(-1,
0xefdaba3e, 0, NULL) = -1 ECHILD (No child processes)
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=415, si_uid=0,
si_status=0, si_utime=0, si_stime=2} ---
rt_sigreturn({mask=[]}) = -1 ECHILD (No child processes)
get_thread_area() = 0xc0022490
wait4(-1, 0xefdaba3e, 0, NULL) = -1 ECHILD (No child processes)
get_thread_area() = 0xc0022490
wait4(-1, 0xefdaba3e, 0, NULL) = -1 ECHILD (No child processes)
get_thread_area() = 0xc0022490
wait4(-1, 0xefdaba3e, 0, NULL) = -1 ECHILD (No child processes)
get_thread_area() = 0xc0022490
wait4(-1, 0xefdaba3e, 0, NULL) = -1 ECHILD (No child processes)
The last two lines loop indefinitely, and dash never teminates, even
though the child process has terminated already (SIGCHLD can be seen
above).
--
> Adrian
>
> > [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903514
>
>
