Hello folks,
we are experiencing a strange behavior while booting kvm-accelerated ICS
image on some linux machines (both ubuntu & debian):
emulator-x86 -verbose -show-kernel -avd x86_4_0_3 -no-window -qemu
-enable-kvm
The resulting log freezes after:
emulator: ping program: /opt/android-sdk-linux/tools/ddms
Therefore, we looked into the source code of the qemu / android emulator
and stumbled over:
qemu-setup.c -> android_emulation_setup(...)
if (path_exists(tmp)) {
...
/* disable SIGALRM for the fork(), the periodic signal seems to
* interefere badly with the fork() implementation on Linux running
* under VMWare.
*/
BEGIN_NOSIGALRM
pid = fork();
if (pid == 0) {
int fd = open("/dev/null", O_WRONLY);
dup2(fd, 1);
dup2(fd, 2);
execl( tmp, _ANDROID_PING_PROGRAM, "ping", "emulator", VERSION_STRING, NULL
);
}
END_NOSIGALRM
}
We are pretty certain that the codes hangs while invoking fork().
Firing strace
strace emulator-x86 -verbose -show-kernel -avd x86_4_0_3 -no-window -qemu
-enable-kvm
spits out an endless continuation of
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0) = ? ERESTARTNOINTR (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
clock_gettime(CLOCK_MONOTONIC, {55232, 717872152}) = 0 sigreturn() = 120
--- SIGIO (I/O possible) @ 0 (0) ---
clock_gettime(CLOCK_MONOTONIC, {55232, 719018162}) = 0 sigreturn() = 120
--- SIGIO (I/O possible) @ 0 (0) ---
clock_gettime(CLOCK_MONOTONIC, {55232, 719310431}) = 0 sigreturn() = 120
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0) = ? ERESTARTNOINTR (To be restarted)
As a temporary workaround, the branch of code in qemu-setup.c triggering
the fork() can be avoided by renaming the "ping program" (namely ddms) by
mv tools/ddms tools/ddms.fork.fix
However, we would like to avoid this "hack" in a productive system.
Any clues why the fork() in combinations with KVM keeps hanging?
Thanks so much!
-- erik
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