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Message-ID: <20170518104151.GG17481@vireshk-i7>
Date: Thu, 18 May 2017 16:11:51 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Milosz Wasilewski <milosz.wasilewski@...aro.org>,
Fathi Boudra <fathi.boudra@...aro.org>,
Tom Gall <tom.gall@...aro.org>,
Sumit Semwal <sumit.semwal@...aro.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: Re: linux-next (4.12-rc1): DEADLOCK: WARNING: possible circular
locking dependency detected
On 18-05-17, 16:08, Viresh Kumar wrote:
> On 18 May 2017 at 16:05, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > Boot HiKey board.
> >
> > [ 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
You sure you pasted the right log? This doesn't look related to
cpufreq at all.
--
viresh
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