[CRIU] [PATCH 0/4] fix fails of the ipc_namespace test

[Pavel Emelyanov]

All applied, thanks!

On 08/13/2014 05:51 PM, Andrey Vagin wrote:
> A few days ago we started to execute tests concurrently and
> the ipc_namespace test started to fail with the following error.
> ------------------------------------------------------------------------------
> 13:42:54.072:    84: ERR: ipc_namespace.c:356: IPC's differ
>  (errno = 11 (Resource temporarily unavailable))
> 13:42:54.073:    84: ERR: ipc_namespace.c:303: msg_ctlmni differs: 524651311 ---> 845
>  (errno = 11 (Resource temporarily unavailable))
> ------------------------------------- END -------------------------------------
> 
> The reason is partly due to auto_msgmni, which is set in a random value.
> If it is enalbed, the value of msgmni is recalculated each time,
> when ipns is created or destroyed in a system.
> 
> But it isn't all. When I set it to zero, the ipc_namespace test
> continued to report the same error. One more bug was found in
> the kernel. The new value of auto_msgmni isn't applied, if a buffer
> contains extra symbols.
> 
> Below you can find two examples. In the new value has not been
> handled properly.
> 
> $ strace ./a.out
> open("/proc/sys/kernel/auto_msgmni", O_WRONLY) = 3
> write(3, "0\n\0", 3)                    = 2
> close(3)                                = 0
> exit_group(0)
> $ cat /sys/kernel/debug/tracing/trace
> 
> $strace ./a.out
> open("/proc/sys/kernel/auto_msgmni", O_WRONLY) = 3
> write(3, "0\n", 2)                      = 2
> close(3)                                = 0
> 
> $ cat /sys/kernel/debug/tracing/trace
> a.out-697   [000] ....  3280.998235: unregister_ipcns_notifier <-proc_ipcauto_dointvec_minmax
> 
> https://lkml.org/lkml/2014/8/13/394
> 
> Andrey Vagin (4):
>   zdtm/ipc_namespaces: don't extra symbols in a sysctl file
>   ipc: set the msgmni sysctl after auto_msgmni
>   sysctl: don't write '\0' at the end of buffer in a sysctl file
>   zdtm/ipc_namespace: set the auto_msgmni sysctl to zero
> 
>  ipc_ns.c                              | 2 +-
>  sysctl.c                              | 5 ++---
>  test/zdtm/live/static/ipc_namespace.c | 4 ++--
>  3 files changed, 5 insertions(+), 6 deletions(-)
>