Hi,
lockdep complains about this:
[ 92.041513] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 92.090910] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0
[ 92.094779] =================================
[ 92.094780] [ INFO: inconsistent lock state ]
[ 92.094782] 3.10.10-rt7 #5 Not tainted
[ 92.094783] ---------------------------------
[ 92.094784] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
[ 92.094787] systemd-journal/1002 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 92.094801] (&trans_pcie->irq_lock){?.+...}, at: [<ffffffffa015587c>] iwl_pcie_isr_ict+0x2c/0x2d0 [iwlwifi]
[ 92.094802] {HARDIRQ-ON-W} state was registered at:
[ 92.094808] [<ffffffff8107ea04>] __lock_acquire+0x5b4/0x1a60
[ 92.094810] [<ffffffff81080622>] lock_acquire+0x62/0x80
[ 92.094814] [<ffffffff81529360>] rt_spin_lock+0x40/0x50
[ 92.094822] [<ffffffffa015a49e>] iwl_trans_pcie_stop_hw+0x1e/0x150 [iwlwifi]
[ 92.094830] [<ffffffffa0265e84>] iwl_op_mode_dvm_start+0x244/0xc10 [iwldvm]
[ 92.094836] [<ffffffffa015062b>] iwl_opmode_register+0xcb/0xf0 [iwlwifi]
[ 92.094840] [<ffffffffa0288037>] acpi_cpufreq_cpu_exit+0x17/0x50 [acpi_cpufreq]
[ 92.094843] [<ffffffff810002a2>] do_one_initcall+0xf2/0x150
[ 92.094848] [<ffffffff8108b0cf>] load_module+0x18cf/0x2150
[ 92.094851] [<ffffffff8108ba96>] SyS_finit_module+0x76/0x80
[ 92.094854] [<ffffffff8152fa50>] system_call_fastpath+0x16/0x1b
[ 92.094855] irq event stamp: 291624
[ 92.094859] hardirqs last enabled at (291623): [<ffffffff8152cef9>] __do_page_fault+0x79/0x5a0
[ 92.094863] hardirqs last disabled at (291624): [<ffffffff8152a228>] common_interrupt+0x68/0x6d
[ 92.094866] softirqs last enabled at (0): [<ffffffff81033229>] copy_process.part.31+0x619/0x14f0
[ 92.094868] softirqs last disabled at (0): [< (null)>] (null)
[ 92.094869]
other info that might help us debug this:
[ 92.094870] Possible unsafe locking scenario:
[ 92.094870] CPU0
[ 92.094871] ----
[ 92.094872] lock(&trans_pcie->irq_lock);
[ 92.094873] <Interrupt>
[ 92.094875] lock(&trans_pcie->irq_lock);
[ 92.094875]
*** DEADLOCK ***
[ 92.094877] 1 lock held by systemd-journal/1002:
[ 92.094882] #0: (&mm->mmap_sem){+++++.}, at: [<ffffffff8152d04c>] __do_page_fault+0x1cc/0x5a0
[ 92.094883]
stack backtrace:
[ 92.094885] CPU: 0 PID: 1002 Comm: systemd-journal Not tainted 3.10.10-rt7 #5
[ 92.094887] Hardware name: Acer Aspire 1810T/JM11-MS, BIOS v1.3310 03/25/2010
[ 92.094890] ffffffff81fd95f0 ffffffff81a21cf0 ffffffff81525783 ffffffff81a21d40
[ 92.094893] ffffffff81522347 0000000000000000 ffff880100000000 ffffffff00000001
[ 92.094895] 0000000000000002 ffff88013734d050 ffffffff8107d420 0000000000000000
[ 92.094896] Call Trace:
[ 92.094902] <IRQ> [<ffffffff81525783>] dump_stack+0x19/0x1b
[ 92.094905] [<ffffffff81522347>] print_usage_bug+0x1fb/0x20c
[ 92.094909] [<ffffffff8107d420>] ? check_usage_backwards+0x140/0x140
[ 92.094912] [<ffffffff8107de3a>] mark_lock+0x23a/0x2c0
[ 92.094914] [<ffffffff8107ec4f>] __lock_acquire+0x7ff/0x1a60
[ 92.094918] [<ffffffff8152d04c>] ? __do_page_fault+0x1cc/0x5a0
[ 92.094920] [<ffffffff81080622>] lock_acquire+0x62/0x80
[ 92.094927] [<ffffffffa015587c>] ? iwl_pcie_isr_ict+0x2c/0x2d0 [iwlwifi]
[ 92.094930] [<ffffffff81529360>] rt_spin_lock+0x40/0x50
[ 92.094936] [<ffffffffa015587c>] ? iwl_pcie_isr_ict+0x2c/0x2d0 [iwlwifi]
[ 92.094943] [<ffffffffa015587c>] iwl_pcie_isr_ict+0x2c/0x2d0 [iwlwifi]
[ 92.094948] [<ffffffff810a88d5>] handle_irq_event_percpu+0x55/0x180
[ 92.094951] [<ffffffff810a8a38>] handle_irq_event+0x38/0x60
[ 92.094954] [<ffffffff810aab7f>] handle_edge_irq+0x6f/0x140
[ 92.094956] [<ffffffff81003ae9>] handle_irq+0x19/0x30
[ 92.094959] [<ffffffff810039b5>] do_IRQ+0x45/0xb0
[ 92.094962] [<ffffffff8152a22d>] common_interrupt+0x6d/0x6d
[ 92.094966] <EOI> [<ffffffff8152d04c>] ? __do_page_fault+0x1cc/0x5a0
[ 92.094969] [<ffffffff810806e0>] ? lock_release_non_nested+0xa0/0x300
[ 92.094973] [<ffffffff8106196d>] ? get_parent_ip+0xd/0x50
[ 92.094976] [<ffffffff8152a2c9>] ? retint_swapgs+0xe/0x13
[ 92.094980] [<ffffffff8123ed3d>] ? trace_hardirqs_off_thunk+0x3a/0x3c
[ 92.094983] [<ffffffff8152d429>] do_page_fault+0x9/0x10
[ 92.094985] [<ffffffff8152a502>] page_fault+0x22/0x30
[ 92.288725] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 92.291849] iwlwifi 0000:02:00.0: Radio type=0x1-0x2-0x0
[ 92.422236] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
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