(using Li's new address and quoting whole message for him)
The change has been in linux-next for quite some time and I've been
booting fedora 16 a lot of times on top of this. Weird. I'll try to
find out what's wrong and if I can't spot it quick enough, will send a
revert patch to Linus. We can try again later. Mandeep, any ideas?
Thanks.
On Thu, Mar 29, 2012 at 12:01:26AM +0200, Jiri Kosina wrote:
> Hi,
>
> I am not able to boot current Linus' tree on system which is using
> systemd. In the early boot phase I get
>
> Failed to create root cgroup hierarchy: No such process
> Failed to allocate manager object: No such process
>
> and that's it, the system is completely unusable afterwards (not having
> any console spawned, no networking, etc).
>
> Bisection pointed to
>
> commit 61d1d219c4c0761059236a46867bc49943c4d29d
> Author: Mandeep Singh Baines <msb@xxxxxxxxxxxx>
> Date: Mon Jan 30 12:51:56 2012 -0800
>
> cgroup: remove extra calls to find_existing_css_set
>
> and I have verified that reverting this single commit on top of current
> Linus' tree makes the problem go away and the system boots properly.
>
> strace output shows that with 61d1d219c applied, systemd is failing while
> trying to add itself to the systemd cgroup:
>
> mkdir("/sys", 0755) = -1 EEXIST (File exists)
> mkdir("/sys/fs", 0755) = -1 EEXIST (File exists)
> mkdir("/sys/fs/cgroup", 0755) = -1 EEXIST (File exists)
> mkdir("/sys/fs/cgroup/systemd", 0755) = -1 EEXIST (File exists)
> mkdir("/sys/fs/cgroup/systemd/system", 0755) = 0
> open("/sys/fs/cgroup/systemd/system/tasks", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 6
> fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f60c4ecb000
> write(6, "357\n", 4) = -1 ESRCH (No such process)
> close(6) = 0
> munmap(0x7f60c4ecb000, 4096) = 0
> writev(3, [{"<27>", 4}, {"systemd", 7}, {"[357]: ", 7}, {"Failed to create root cgroup hierarchy: No such process", 55}, {"\n", 1}], 5) = 74
> open("/sys/fs/cgroup/systemd/system/tasks", O_RDONLY|O_CLOEXEC) = 6
> fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f60c4ecb000
> read(6, "357\n", 4096) = 4
> open("/sys/fs/cgroup/systemd/tasks", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 7
> fstat(7, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f60c4eca000
> write(7, "357\n", 4) = -1 ESRCH (No such process)
> close(7) = 0
> munmap(0x7f60c4eca000, 4096) = 0
> read(6, "", 4096) = 0
> close(6) = 0
> munmap(0x7f60c4ecb000, 4096) = 0
> open("/sys/fs/cgroup/systemd/system/tasks", O_RDONLY|O_CLOEXEC) = 6
> fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f60c4ecb000
> read(6, "", 4096) = 0
> close(6) = 0
> munmap(0x7f60c4ecb000, 4096) = 0
> open("/sys/fs/cgroup/systemd/system", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 6
> getdents(6, /* 7 entries */, 32768) = 240
> getdents(6, /* 0 entries */, 32768) = 0
> lstat("/sys/fs/cgroup/systemd/system/tasks", {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
> rmdir("/sys/fs/cgroup/systemd/system") = 0
> close(6) = 0
> close(4) = 0
> close(5) = 0
> close(0) = 0
> writev(3, [{"<27>", 4}, {"systemd", 7}, {"[357]: ", 7}, {"Failed to allocate manager object: No such process", 50}, {"\n", 1}], 5) = 69
--
tejun
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