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Date: Mon, 10 Aug 2020 08:22:34 +0800
From: kernel test robot <lkp@...el.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [cpufreq] d203ef0dcb:
WARNING:possible_circular_locking_dependency_detected
Greeting,
FYI, we noticed the following commit (built with gcc-9):
commit: d203ef0dcbacc3a3ae1b41cea1b8b72face55704 ("cpufreq: intel_pstate: Implement passive mode with HWP enabled")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: kernel-selftests
with following parameters:
group: kselftests-cpufreq
ucode: 0xdc
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: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G 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 <lkp@...el.com>
[ 48.078152] WARNING: possible circular locking dependency detected
[ 48.084624] 5.8.0-rc5-00027-gd203ef0dcbacc #1 Tainted: G I
[ 48.091702] ------------------------------------------------------
[ 48.098235] main.sh/1263 is trying to acquire lock:
[ 48.103417] ffffffff82ec7f08 (intel_pstate_driver_lock){+.+.}-{3:3}, at: store_energy_performance_preference+0xec/0x250
[ 48.114475]
[ 48.114475] but task is already holding lock:
[ 48.121057] ffff88810775cb80 (&policy->rwsem){++++}-{3:3}, at: store+0x69/0xa0
[ 48.128584]
[ 48.128584] which lock already depends on the new lock.
[ 48.128584]
[ 48.137870]
[ 48.137870] the existing dependency chain (in reverse order) is:
[ 48.146026]
[ 48.146026] -> #2 (&policy->rwsem){++++}-{3:3}:
[ 48.152689] __lock_acquire+0x538/0xa90
[ 48.157348] lock_acquire+0xab/0x390
[ 48.161752] down_write+0x38/0x70
[ 48.165970] store+0x69/0xa0
[ 48.169670] kernfs_fop_write+0xdc/0x1c0
[ 48.174410] vfs_write+0xee/0x220
[ 48.178547] ksys_write+0x68/0xe0
[ 48.182687] do_syscall_64+0x52/0xb0
[ 48.187198] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 48.193098]
[ 48.193098] -> #1 (cpu_hotplug_lock){++++}-{0:0}:
[ 48.199960] __lock_acquire+0x538/0xa90
[ 48.204636] lock_acquire+0xab/0x390
[ 48.209146] cpus_read_lock+0x39/0xd0
[ 48.213656] cpufreq_register_driver+0xb6/0x2a0
[ 48.219118] intel_pstate_register_driver+0x42/0xb0
[ 48.224890] intel_pstate_init+0x457/0x4c4
[ 48.229956] do_one_initcall+0x5d/0x330
[ 48.234653] kernel_init_freeable+0x248/0x2c9
[ 48.239933] kernel_init+0xa/0x112
[ 48.243954] RESULT_ROOT=/result/kernel-selftests/kselftests-cpufreq-ucode=0xdc/lkp-skl-d01/debian-10.4-x86_64-20200603.cgz/x86_64-rhel-7.6-kselftests/gcc-9/d203ef0dcbacc3a3ae1b41cea1b8b72face55704/3
[ 48.243956]
[ 48.244207] ret_from_fork+0x22/0x30
[ 48.244208]
[ 48.244208] -> #0 (intel_pstate_driver_lock){+.+.}-{3:3}:
[ 48.266422] job=/lkp/jobs/scheduled/lkp-skl-d01/kernel-selftests-kselftests-cpufreq-ucode=0xdc-debian-10.4-x86_64-20200603.cgz-d203ef0dcbacc3a3ae1b41cea1b8b72face55704-20200809-28154-vptfq5-1.yaml
[ 48.266424]
[ 48.269230] check_prev_add+0x8e/0x9f0
[ 48.269231] validate_chain+0x79b/0x1080
[ 48.269231] __lock_acquire+0x538/0xa90
[ 48.269233] lock_acquire+0xab/0x390
[ 48.316522] __mutex_lock+0xac/0x9c0
[ 48.321142] store_energy_performance_preference+0xec/0x250
[ 48.327686] store+0x7c/0xa0
[ 48.331564] kernfs_fop_write+0xdc/0x1c0
[ 48.336533] vfs_write+0xee/0x220
[ 48.340897] ksys_write+0x68/0xe0
[ 48.345261] do_syscall_64+0x52/0xb0
[ 48.349900] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 48.355983]
[ 48.355983] other info that might help us debug this:
[ 48.355983]
[ 48.365539] Chain exists of:
[ 48.365539] intel_pstate_driver_lock --> cpu_hotplug_lock --> &policy->rwsem
[ 48.365539]
[ 48.378769] Possible unsafe locking scenario:
[ 48.378769]
[ 48.385730] CPU0 CPU1
[ 48.390746] ---- ----
[ 48.395816] lock(&policy->rwsem);
[ 48.399818] lock(cpu_hotplug_lock);
[ 48.406450] lock(&policy->rwsem);
[ 48.412935] lock(intel_pstate_driver_lock);
[ 48.417768]
[ 48.417768] *** DEADLOCK ***
[ 48.417768]
[ 48.425132] 5 locks held by main.sh/1263:
[ 48.429578] #0: ffff8882e5f38438 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x1ba/0x220
[ 48.438068] #1: ffff8884550d6288 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write+0xa5/0x1c0
[ 48.446893] #2: ffff8882cfcf42a8 (kn->active#156){.+.+}-{0:0}, at: kernfs_fop_write+0xad/0x1c0
[ 48.456102] #3: ffffffff82c73a70 (cpu_hotplug_lock){++++}-{0:0}, at: store+0x26/0xa0
[ 48.464370] #4: ffff88810775cb80 (&policy->rwsem){++++}-{3:3}, at: store+0x69/0xa0
[ 48.472470]
[ 48.472470] stack backtrace:
[ 48.477844] CPU: 0 PID: 1263 Comm: main.sh Tainted: G I 5.8.0-rc5-00027-gd203ef0dcbacc #1
[ 48.487799] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.2.8 01/26/2016
[ 48.495665] Call Trace:
[ 48.498622] dump_stack+0x96/0xd0
[ 48.502441] check_noncircular+0x162/0x180
[ 48.507124] ? __lock_acquire+0x538/0xa90
[ 48.511635] check_prev_add+0x8e/0x9f0
[ 48.515977] validate_chain+0x79b/0x1080
[ 48.520415] __lock_acquire+0x538/0xa90
[ 48.524791] lock_acquire+0xab/0x390
[ 48.528936] ? store_energy_performance_preference+0xec/0x250
[ 48.535217] __mutex_lock+0xac/0x9c0
[ 48.539313] ? store_energy_performance_preference+0xec/0x250
[ 48.545551] ? store_energy_performance_preference+0xec/0x250
[ 48.551822] ? sscanf+0x4e/0x70
[ 48.555470] ? store_energy_performance_preference+0xec/0x250
[ 48.561707] store_energy_performance_preference+0xec/0x250
[ 48.567808] store+0x7c/0xa0
[ 48.571279] kernfs_fop_write+0xdc/0x1c0
[ 48.575701] vfs_write+0xee/0x220
[ 48.579494] ksys_write+0x68/0xe0
[ 48.583324] do_syscall_64+0x52/0xb0
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,
lkp
View attachment "config-5.8.0-rc5-00027-gd203ef0dcbacc" of type "text/plain" (209046 bytes)
View attachment "job-script" of type "text/plain" (6358 bytes)
View attachment "dmesg" of type "text/plain" (115821 bytes)
View attachment "kernel-selftests" of type "text/plain" (804 bytes)
View attachment "job.yaml" of type "text/plain" (5481 bytes)
View attachment "reproduce" of type "text/plain" (170 bytes)
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