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Date: Fri, 31 Jul 2020 19:59:29 +0800
From: kernel test robot <rong.a.chen@...el.com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Linux PM <linux-pm@...r.kernel.org>,
Linux Documentation <linux-doc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
Giovanni Gherdovich <ggherdovich@...e.cz>,
Doug Smythies <dsmythies@...us.net>,
Francisco Jerez <francisco.jerez.plata@...el.com>,
0day robot <lkp@...el.com>, lkp@...ts.01.org
Subject: [cpufreq] 48fc4efcdd:
WARNING:possible_circular_locking_dependency_detected
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: 48fc4efcdd584e8f04da8b195262ec38221bd6db ("[PATCH v2 2/2] cpufreq: intel_pstate: Implement passive mode with HWP enabled")
url: https://github.com/0day-ci/linux/commits/Rafael-J-Wysocki/cpufreq-intel_pstate-Implement-passive-mode-with-HWP-enabled/20200717-014718
base: https://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git linux-next
in testcase: kernel-selftests
with following parameters:
group: kselftests-cpufreq
ucode: 0x5002f01
test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@...el.com>
[ 74.745395] WARNING: possible circular locking dependency detected
[ 74.752071] 5.8.0-rc5-00064-g48fc4efcdd584 #1 Not tainted
[ 74.757949] ------------------------------------------------------
[ 74.764604] main.sh/3019 is trying to acquire lock:
[ 74.769954] ffffffff82ec7f08 (intel_pstate_driver_lock){+.+.}-{3:3}, at: store_energy_performance_preference+0xec/0x250
[ 74.781228]
[ 74.781228] but task is already holding lock:
[ 74.788017] ffff88b07b5f8380 (&policy->rwsem){++++}-{3:3}, at: store+0x69/0xa0
[ 74.795711]
[ 74.795711] which lock already depends on the new lock.
[ 74.795711]
[ 74.805222]
[ 74.805222] the existing dependency chain (in reverse order) is:
[ 74.813529]
[ 74.813529] -> #2 (&policy->rwsem){++++}-{3:3}:
[ 74.820371] __lock_acquire+0x538/0xa90
[ 74.825144] lock_acquire+0xab/0x390
[ 74.829660] down_write+0x38/0x70
[ 74.833910] store+0x69/0xa0
[ 74.837724] kernfs_fop_write+0xdc/0x1c0
[ 74.842576] vfs_write+0xee/0x220
[ 74.846814] ksys_write+0x68/0xe0
[ 74.851039] do_syscall_64+0x52/0xb0
[ 74.855512] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 74.861463]
[ 74.861463] -> #1 (cpu_hotplug_lock){++++}-{0:0}:
[ 74.868395] __lock_acquire+0x538/0xa90
[ 74.873127] lock_acquire+0xab/0x390
[ 74.877597] cpus_read_lock+0x39/0xd0
[ 74.882146] cpufreq_register_driver+0xb6/0x2a0
[ 74.887556] intel_pstate_register_driver+0x32/0x70
[ 74.893312] intel_pstate_init+0x45d/0x4ca
[ 74.898281] do_one_initcall+0x5d/0x330
[ 74.902984] kernel_init_freeable+0x248/0x2c9
[ 74.908185] kernel_init+0xa/0x112
[ 74.912430] ret_from_fork+0x1f/0x30
[ 74.916850]
[ 74.916850] -> #0 (intel_pstate_driver_lock){+.+.}-{3:3}:
[ 74.924376] check_prev_add+0x8e/0x9f0
[ 74.928988] validate_chain+0x79b/0x1080
[ 74.933773] __lock_acquire+0x538/0xa90
[ 74.938469] lock_acquire+0xab/0x390
[ 74.942896] __mutex_lock+0xac/0x9c0
[ 74.947318] store_energy_performance_preference+0xec/0x250
[ 74.953735] store+0x7c/0xa0
[ 74.957458] kernfs_fop_write+0xdc/0x1c0
[ 74.962231] vfs_write+0xee/0x220
[ 74.966395] ksys_write+0x68/0xe0
[ 74.970549] do_syscall_64+0x52/0xb0
[ 74.974975] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 74.980859]
[ 74.980859] other info that might help us debug this:
[ 74.980859]
[ 74.989744] Chain exists of:
[ 74.989744] intel_pstate_driver_lock --> cpu_hotplug_lock --> &policy->rwsem
[ 74.989744]
[ 75.002149] Possible unsafe locking scenario:
[ 75.002149]
[ 75.008643] CPU0 CPU1
[ 75.013461] ---- ----
[ 75.018275] lock(&policy->rwsem);
[ 75.022037] lock(cpu_hotplug_lock);
[ 75.028495] lock(&policy->rwsem);
[ 75.034773] lock(intel_pstate_driver_lock);
[ 75.039427]
[ 75.039427] *** DEADLOCK ***
[ 75.039427]
[ 75.046168] 5 locks held by main.sh/3019:
[ 75.050456] #0: ffff888b9d973438 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x1ba/0x220
[ 75.058750] #1: ffff888beaaec488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write+0xa5/0x1c0
[ 75.067413] #2: ffff8898284de890 (kn->active#163){.+.+}-{0:0}, at: kernfs_fop_write+0xad/0x1c0
[ 75.076422] #3: ffffffff82c73a70 (cpu_hotplug_lock){++++}-{0:0}, at: store+0x26/0xa0
[ 75.084566] #4: ffff88b07b5f8380 (&policy->rwsem){++++}-{3:3}, at: store+0x69/0xa0
[ 75.092528]
[ 75.092528] stack backtrace:
[ 75.097500] CPU: 0 PID: 3019 Comm: main.sh Not tainted 5.8.0-rc5-00064-g48fc4efcdd584 #1
[ 75.105902] Hardware name: Intel Corporation ............/S9200WKBRD2, BIOS SE5C620.86B.0D.01.0552.060220191912 06/02/2019
[ 75.117274] Call Trace:
[ 75.120081] dump_stack+0x96/0xd0
[ 75.123754] check_noncircular+0x162/0x180
[ 75.128220] check_prev_add+0x8e/0x9f0
[ 75.132325] validate_chain+0x79b/0x1080
[ 75.136589] __lock_acquire+0x538/0xa90
[ 75.140767] lock_acquire+0xab/0x390
[ 75.144684] ? store_energy_performance_preference+0xec/0x250
[ 75.150775] __mutex_lock+0xac/0x9c0
[ 75.154697] ? store_energy_performance_preference+0xec/0x250
[ 75.160786] ? __lock_acquire+0x538/0xa90
[ 75.165147] ? store_energy_performance_preference+0xec/0x250
[ 75.171282] ? sscanf+0x4e/0x70
[ 75.174781] ? store_energy_performance_preference+0xec/0x250
[ 75.180886] store_energy_performance_preference+0xec/0x250
[ 75.186816] store+0x7c/0xa0
[ 75.190056] kernfs_fop_write+0xdc/0x1c0
[ 75.194338] vfs_write+0xee/0x220
[ 75.198011] ksys_write+0x68/0xe0
[ 75.201685] do_syscall_64+0x52/0xb0
[ 75.205617] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 75.211051] RIP: 0033:0x7f2c1dfa9504
[ 75.214999] Code: Bad RIP value.
[ 75.218582] RSP: 002b:00007fffe26da068 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
Rong Chen
View attachment "config-5.8.0-rc5-00064-g48fc4efcdd584" of type "text/plain" (209008 bytes)
View attachment "job-script" of type "text/plain" (6411 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (40412 bytes)
View attachment "kernel-selftests" of type "text/plain" (866 bytes)
View attachment "job.yaml" of type "text/plain" (5362 bytes)
View attachment "reproduce" of type "text/plain" (170 bytes)
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