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wlcore: DEADLOCK: WARNING: possible circular locking dependency detected

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Hi Team,

DEADLOCK detected on HiKey (arm64) development board running
linux-next-4.12.0-rc1. This DEADLOCK occurred two times
while booting the device and
other one is while running libhugetlbfs test suite.

Error log:
------------
https://pastebin.com/ABmiTfLb

LAVA job id:
https://validation.linaro.org/scheduler/job/1498548/log_file#L_195_866

Linux kernel version:
Linux version 4.12.0-rc1-next-20170515 (buildslave@x86-64-07) (gcc
version 6.2.1 20161016 (Linaro GCC 6.2-2016.11) ) #1 SMP PREEMPT Mon
May 15 03:12:43 UTC 2017

kernel_repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
kernel_commit_id: ecf5e3d45a01969de14e7feb1126f948fc2a2635
kernel_branch: master
build_arch: aarch64
compiler:  aarch64-linaro-linux linaro-6.2

Build location:
-------------------
https://snapshots.linaro.org/openembedded/lkft/morty/hikey/rpb/linux-next/10

Boot image:
   - boot-0.0+AUTOINC+06e4def583-4adfdd06f1-r0-hikey-20170515030615-10.uefi.img
Rootfs:
   - rpb-console-image-hikey-20170515030615-10.rootfs.img.gz

steps to reproduce:
--------------------------
 - sudo fastboot flash boot
boot-0.0+AUTOINC+06e4def583-4adfdd06f1-r0-hikey-20170515030615-10.uefi.img
 - sudo fastboot flash system
rpb-console-image-hikey-20170515030615-10.rootfs.img
 - Boot HiKey board.

Error log snippet:
-----------------------
[   76.039134] ======================================================
[   76.045319] WARNING: possible circular locking dependency detected
[   76.051507] 4.12.0-rc1-next-20170515 #1 Not tainted
[   76.056387] ------------------------------------------------------
[   76.062572] irq/56-wl18xx/2354 is trying to acquire lock:
[   76.067974]  (rtnl_mutex){+.+.+.}, at: [<ffff0000089b92f8>]
rtnl_lock+0x18/0x20
[   76.075309]
[   76.075309] but task is already holding lock:
[   76.081145]  (&wl->mutex){+.+.+.}, at: [<ffff000000f24054>]
wlcore_irq+0xdc/0x1a0 [wlcore]
[   76.089510]
[   76.089510] which lock already depends on the new lock.
[   76.089510]
[   76.097697]
[   76.097697] the existing dependency chain (in reverse order) is:
[   76.105187]
[   76.105187] -> #1 (&wl->mutex){+.+.+.}:
[   76.110519]        __lock_acquire+0x17b4/0x1928
[   76.115053]        lock_acquire+0xc8/0x290
[   76.119155]        __mutex_lock+0x78/0x8a8
[   76.123261]        mutex_lock_nested+0x1c/0x28
[   76.127775]        wlcore_regdomain_config.part.25+0x20/0x78 [wlcore]
[   76.134292]        wl1271_reg_notify+0x30/0x40 [wlcore]
[   76.139727]        wiphy_update_regulatory+0x294/0x420 [cfg80211]
[   76.145975]        wiphy_regulatory_register+0x34/0x48 [cfg80211]
[   76.152218]        wiphy_register+0x5fc/0x7d8 [cfg80211]
[   76.157812]        ieee80211_register_hw+0x3d4/0xa48 [mac80211]
[   76.163811]        wlcore_nvs_cb+0x758/0x9a8 [wlcore]
[   76.168936]        wlcore_probe+0x98/0xf0 [wlcore]
[   76.173779]        wl18xx_probe+0x4c/0xa8 [wl18xx]
[   76.178586]        platform_drv_probe+0x58/0xc0
[   76.183127]        driver_probe_device+0x214/0x2d0
[   76.187926]        __driver_attach+0xb4/0xb8
[   76.192204]        bus_for_each_dev+0x64/0xa0
[   76.196568]        driver_attach+0x20/0x28
[   76.200672]        bus_add_driver+0x110/0x230
[   76.205037]        driver_register+0x60/0xf8
[   76.209315]        __platform_driver_register+0x40/0x48
[   76.214551]        0xffff000000f90018
[   76.218222]        do_one_initcall+0x38/0x120
[   76.222589]        do_init_module+0x5c/0x1c0
[   76.226868]        load_module+0x1cac/0x2428
[   76.231145]        SyS_finit_module+0xc0/0xd0
[   76.235510]        __sys_trace_return+0x0/0x4
[   76.239872]
[   76.239872] -> #0 (rtnl_mutex){+.+.+.}:
[   76.245215]        print_circular_bug+0x80/0x2e0
[   76.249840]        __lock_acquire+0x17dc/0x1928
[   76.254379]        lock_acquire+0xc8/0x290
[   76.258485]        __mutex_lock+0x78/0x8a8
[   76.262589]        mutex_lock_nested+0x1c/0x28
[   76.267042]        rtnl_lock+0x18/0x20
[   76.270956]        cfg80211_sched_scan_results+0x60/0x230 [cfg80211]
[   76.277587]        ieee80211_sched_scan_results+0x5c/0x1e0 [mac80211]
[   76.284117]        wlcore_scan_sched_scan_results+0x24/0x60 [wlcore]
[   76.290523]        wl18xx_process_mailbox_events+0x60/0x468 [wl18xx]
[   76.296955]        wl1271_event_handle+0xc4/0x160 [wlcore]
[   76.302514]        wlcore_irq_locked+0x4e0/0x660 [wlcore]
[   76.307986]        wlcore_irq+0xe4/0x1a0 [wlcore]
[   76.312703]        irq_thread_fn+0x28/0x68
[   76.316809]        irq_thread+0x158/0x1f8
[   76.320827]        kthread+0x108/0x138
[   76.324584]        ret_from_fork+0x10/0x40
[   76.328686]
[   76.328686] other info that might help us debug this:
[   76.328686]
[   76.336715]  Possible unsafe locking scenario:
[   76.336715]
[   76.342650]        CPU0                    CPU1
[   76.347186]        ----                    ----
[   76.351722]   lock(&wl->mutex);
[   76.354872]                                lock(rtnl_mutex);
[   76.360543]                                lock(&wl->mutex);
[   76.366213]   lock(rtnl_mutex);
[   76.369361]
[   76.369361]  *** DEADLOCK ***
[   76.369361]
[   76.375304] 1 lock held by irq/56-wl18xx/2354:
[   76.379753]  #0:  (&wl->mutex){+.+.+.}, at: [<ffff000000f24054>]
wlcore_irq+0xdc/0x1a0 [wlcore]
[   76.388547]
[   76.388547] stack backtrace:
[   76.392922] CPU: 4 PID: 2354 Comm: irq/56-wl18xx Not tainted
4.12.0-rc1-next-20170515 #1
[   76.401032] Hardware name: HiKey Development Board (DT)
[   76.406267] Call trace:
[   76.408720] [<ffff00000808a028>] dump_backtrace+0x0/0x240
[   76.414131] [<ffff00000808a32c>] show_stack+0x14/0x20
[   76.419195] [<ffff0000084984f4>] dump_stack+0xbc/0xf8
[   76.424258] [<ffff000008124504>] print_circular_bug+0x1f4/0x2e0
[   76.430190] [<ffff00000812757c>] __lock_acquire+0x17dc/0x1928
[   76.435947] [<ffff000008127f38>] lock_acquire+0xc8/0x290
[   76.441272] [<ffff000008af5888>] __mutex_lock+0x78/0x8a8
[   76.446595] [<ffff000008af60d4>] mutex_lock_nested+0x1c/0x28
[   76.452267] [<ffff0000089b92f8>] rtnl_lock+0x18/0x20
[   76.457402] [<ffff000000cf4518>]
cfg80211_sched_scan_results+0x60/0x230 [cfg80211]
[   76.465253] [<ffff000000dfb0cc>]
ieee80211_sched_scan_results+0x5c/0x1e0 [mac80211]
[   76.472994] [<ffff000000f3887c>]
wlcore_scan_sched_scan_results+0x24/0x60 [wlcore]
[   76.480624] [<ffff000000f77640>]
wl18xx_process_mailbox_events+0x60/0x468 [wl18xx]
[   76.488278] [<ffff000000f2c874>] wl1271_event_handle+0xc4/0x160 [wlcore]
[   76.495056] [<ffff000000f22c28>] wlcore_irq_locked+0x4e0/0x660 [wlcore]
[   76.501747] [<ffff000000f2405c>] wlcore_irq+0xe4/0x1a0 [wlcore]
[   76.507682] [<ffff00000813dab8>] irq_thread_fn+0x28/0x68
[   76.513005] [<ffff00000813dda0>] irq_thread+0x158/0x1f8
[   76.518242] [<ffff0000080f4b38>] kthread+0x108/0x138
[   76.523217] [<ffff000008083710>] ret_from_fork+0x10/0x40

Best regards
Naresh Kamboju



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