next-20130607 BUG: sleeping function called from invalid context at lib/idr.c:424

[Valdis Kletnieks]

Tried to boot next-20130607, got this during early boot.  -0603 is OK, so
whatever did it is a recent patch. Not sure who's fault it is, as idr_preload()
has been there since February, apparently something in the SyS_semget()
path has been changed...

Looking at 'git blame', I see a bunch of patches from Davidlohr Bueso on 06/07
that hit ipc/util.c and friends.

[   17.332871] BUG: sleeping function called from invalid context at lib/idr.c:424
[   17.333013] in_atomic(): 0, irqs_disabled(): 0, pid: 231, name: systemd-cryptse
[   17.333135] 2 locks held by systemd-cryptse/231:
[   17.333226]  #0:  (&ids->rw_mutex){+++++.}, at: [<ffffffff811de265>] ipcget+0x58/0x162
[   17.333650]  #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff811e020e>] rcu_read_lock+0x0/0x6c
[   17.334103] CPU: 0 PID: 231 Comm: systemd-cryptse Not tainted 3.10.0-rc4-next-20130607 #79
[   17.334227] Hardware name: Dell Inc. Latitude E6530/07Y85M, BIOS A11 03/12/2013
[   17.334347]  0000000000000000 ffff8801254e3e18 ffffffff815ebdd7 ffff88012545ecc0
[   17.334706]  ffff8801254e3e40 ffffffff8105b59b ffff8801262a1600 ffffffff81a3ee28
[   17.335088]  00000000000000d0 ffff8801254e3e70 ffffffff812377ec ffff8801262a1618
[   17.335445] Call Trace:
[   17.335535]  [<ffffffff815ebdd7>] dump_stack+0x4f/0x9a
[   17.335633]  [<ffffffff8105b59b>] __might_sleep+0x19e/0x1a5
[   17.335730]  [<ffffffff812377ec>] idr_preload+0xb7/0x15c
[   17.335827]  [<ffffffff811ddd0c>] ipc_addid+0x3a/0x168
[   17.335924]  [<ffffffff811e055f>] newary+0xa5/0x1b7
[   17.336040]  [<ffffffff811de349>] ipcget+0x13c/0x162
[   17.336139]  [<ffffffff811e19a8>] SyS_semget+0x5d/0x69
[   17.336233]  [<ffffffff811e04ba>] ? semctl_nolock.constprop.15+0x240/0x240
[   17.336332]  [<ffffffff811dfb4c>] ? sysvipc_sem_proc_show+0x9b/0x9b
[   17.336430]  [<ffffffff811df9f5>] ? __ticket_spin_is_locked+0x11/0x11
[   17.336529]  [<ffffffff815f9dd2>] system_call_fastpath+0x16/0x1b
[   17.344508] bio: create slab <bio-1> at 1

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