It turns out the write() is not a part of the dbus transaction with
cgmanager, but actually a part of libnih's mainloop exiting code:
(gdb) where
#0 0x00007f70ea509700 in __write_nocancel () at
../sysdeps/unix/syscall-template.S:81
#1 0x00007f70eae47377 in nih_main_loop_interrupt () at main.c:630
#2 0x00007f70eaa0d64b in _dbus_transport_queue_messages
(transport=transport@entry=0x2329290) at ../../dbus/dbus-transport.c:1157
#3 0x00007f70eaa0df8e in do_reading (transport=0x2329290) at
../../dbus/dbus-transport-socket.c:851
#4 0x00007f70eaa0e626 in socket_do_iteration (transport=0x2329290, flags=6,
timeout_milliseconds=<optimized out>) at ../../dbus/dbus-transport-socket.c:1162
#5 0x00007f70eaa0d3ff in _dbus_transport_do_iteration (transport=0x2329290,
flags=3940863025, flags@entry=6, timeout_milliseconds=1,
timeout_milliseconds@entry=25000) at ../../dbus/dbus-transport.c:976
#6 0x00007f70ea9f79dc in _dbus_connection_do_iteration_unlocked
(connection=connection@entry=0x232d580, pending=pending@entry=0x232bf90,
flags=flags@entry=6,
timeout_milliseconds=timeout_milliseconds@entry=25000) at
../../dbus/dbus-connection.c:1234
#7 0x00007f70ea9f8389 in _dbus_connection_block_pending_call
(pending=0x232bf90) at ../../dbus/dbus-connection.c:2415
#8 0x00007f70eaa0772a in dbus_pending_call_block (pending=<optimized out>) at
../../dbus/dbus-pending-call.c:748
#9 0x00007f70ea9f894d in dbus_connection_send_with_reply_and_block
(connection=0x232d580, message=0x23056e0, timeout_milliseconds=-1,
error=0x7fff22097b70)
at ../../dbus/dbus-connection.c:3530
#10 0x00007f70eb05b4f5 in cgmanager_create_sync () from
/lib/x86_64-linux-gnu/libcgmanager.so.0
#11 0x0000000000422520 in ?? ()
#12 0x00000000004164a4 in ?? ()
#13 0x000000000041655d in ?? ()
#14 0x000000000040f3ed in ?? ()
#15 0x00000000004107dc in ?? ()
#16 0x000000000040c4d3 in ?? ()
#17 0x00007f70eaa06e26 in _dbus_object_tree_dispatch_and_unlock
(tree=0x22f92a0, message=message@entry=0x22fb9d0,
found_object=found_object@entry=0x7fff22098114)
at ../../dbus/dbus-object-tree.c:862
#18 0x00007f70ea9f9a01 in dbus_connection_dispatch (connection=0x22f8870) at
../../dbus/dbus-connection.c:4672
#19 0x0000000000409467 in ?? ()
#20 0x000000000040622c in ?? ()
#21 0x00007f70ea43eec5 in __libc_start_main (main=0x4060d0, argc=1,
argv=0x7fff220982d8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>,
stack_end=0x7fff220982c8) at libc-start.c:287
#22 0x000000000040637c in ?? ()
This is happening in this part of nih/main.c:
/**
* nih_main_loop_interrupt:
*
* Interrupts the current (or next) main loop iteration because of an
* event that potentially needs immediate processing, or because some
* condition of the main loop has been changed.
**/
void
nih_main_loop_interrupt (void)
{
nih_main_loop_init ();
if (interrupt_pipe[1] != -1)
while (write (interrupt_pipe[1], "", 1) < 0)
;
}
Why the interrupt_pipe[0] woudl be closed is beyond me.
A simple fix would be to add a check for errno == EAGAIN in the while
loop to avoid this condition. However, we should figure out why this is
happening and hopefully we can prevent it happening at all.
** Also affects: libnih (Ubuntu)
Importance: Undecided
Status: New
** Changed in: libnih (Ubuntu)
Importance: Undecided => High
** Changed in: libnih (Ubuntu)
Status: New => Confirmed
** Changed in: cgmanager (Ubuntu)
Importance: Undecided => High
** Changed in: cgmanager (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1303649
Title:
systemd-logind spins in cgmanager_ping_sync()
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