[Devel] WARN_ON(is_virtual_pid(pgrp)) ?

[Kirill Korotaev]

AFAIR it can be ignored.
it warn's that some kernel thread with virtual pid (i.e. from inside VE)
changes it's session/pgrp.

BTW, In 2.6.18 (what kernel are you running?) these lines are changed to:
         WARN_ON(__is_virtual_pid(pgrp));
         WARN_ON(__is_virtual_pid(session));

Thanks,
Kirill


Jakob Goldbach wrote:
> Hi,
> 
> I'm running a Lustre client on a openvz kernel. After enabling
> ve_allow_kthreads I get the warnings below which comes from
> __set_special_pid (code pasted below). But what is openvz really warning
> about here? Is it an old debug message ? Should I care about it ? 
> 
> Thanks
> /Jakob
> 
> 
> 
> BUG: warning at kernel/exit.c:333/__set_special_pids()
> 
> Call Trace:
>  [<ffffffff8020af1b>] dump_stack+0x12/0x17
>  [<ffffffff8023076e>] __set_special_pids+0xab/0x127
>  [<ffffffff8023080c>] set_special_pids+0x22/0x33
>  [<ffffffff80232607>] daemonize+0x86/0x2e8
>  [<ffffffff88087ae3>] :libcfs:cfs_daemonize+0x13/0x70
>  [<ffffffff883114ec>] :lustre:ll_statahead_thread+0x19c/0x17f0
>  [<ffffffff8020a5e8>] child_rip+0xa/0x12
> DWARF2 unwinder stuck at child_rip+0xa/0x12
> Leftover inexact backtrace:
>  [<ffffffff88311350>] :lustre:ll_statahead_thread+0x0/0x17f0
>  [<ffffffff8020a5de>] child_rip+0x0/0x12
> 
> 
> 
> 
> void __set_special_pids(pid_t session, pid_t pgrp)
> {
>         struct task_struct *curr = current->group_leader;
> 
>         WARN_ON(is_virtual_pid(pgrp));
>         WARN_ON(is_virtual_pid(session));
> 
>         if (curr->signal->session != session) {
>                 detach_pid(curr, PIDTYPE_SID);
>                 curr->signal->session = session;
>                 attach_pid(curr, PIDTYPE_SID, session);
>         }
>         if (process_group(curr) != pgrp) {
>                 detach_pid(curr, PIDTYPE_PGID);
>                 curr->signal->pgrp = pgrp;
>                 attach_pid(curr, PIDTYPE_PGID, pgrp);
>         }
> }
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
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