Ingo Molnar a écrit :
* Andrew Morton <[email protected]> wrote:
Makes my machine hang early during the startup of init.
The last process to pass through close_file() is `hostname', presuably
parented by init. `hostname' exits then everything stops. init is
left sleeping in select().
All very strange.
weird. This really shouldnt cause a hang - i think there must be a bug
hiding elsewhere, this cond_resched() ought to be fine.
Ingo
Maybe a process is now awaken because of a closed pipe, instead of a SIGCHLD
Process A, father/parent of process B. They share a pipe (A reads the
pipe, B writes to)
Before
Process B exits, "atomically close all of its files and sending a SIGCLD
to its parent"
Process A catch the SIGCLD.
After :
Process B exits "close its files (and the pipe), reschedule before final
SIGCLD"
Process A gets the POLLIN/POLLHUP indication on the pipe -> Another code
path is run and may trigger a user side bug ?
Eric
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