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Date: Sun, 29 Oct 2017 22:18:55 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Byungchul Park <byungchul.park@....com>
Cc: Ingo Molnar <mingo@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
"H. Peter Anvin" <hpa@...or.com>, tipbuild@...or.com, lkp@...org
Subject: [lkp-robot] [locking/lockdep] 2dcd5adfb7:
WARNING:possible_circular_locking_dependency_detected
FYI, we noticed the following commit (built with gcc-5):
commit: 2dcd5adfb7401b762ddbe4b86dcacc2f3de6b97b ("locking/lockdep: Remove the BROKEN flag from CONFIG_LOCKDEP_CROSSRELEASE and CONFIG_LOCKDEP_COMPLETIONS")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git locking/core
in testcase: boot
on test machine: qemu-system-i386 -enable-kvm -m 256M
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+-------------------------------------------------------+------------+------------+
| | d141babe42 | 2dcd5adfb7 |
+-------------------------------------------------------+------------+------------+
| boot_successes | 20 | 0 |
| boot_failures | 0 | 20 |
| WARNING:possible_circular_locking_dependency_detected | 0 | 20 |
| BUG:kernel_hang_in_test_stage | 0 | 16 |
+-------------------------------------------------------+------------+------------+
[ 4.442653] WARNING: possible circular locking dependency detected
[ 4.443206] 4.14.0-rc6-00050-g2dcd5ad #1 Not tainted
[ 4.443648] ------------------------------------------------------
[ 4.444200] kworker/0:1/15 is trying to acquire lock:
[ 4.444661] (ww_class_mutex){+.+.}, at: [<b110af92>] test_abba_work+0x3b/0x167
[ 4.445354]
[ 4.445354] but now in release context of a crosslock acquired at the following:
[ 4.446160] ((completion)&abba.b_ready){+.+.}, at: [<b1baf438>] wait_for_common+0x1b/0x2b
[ 4.446899]
[ 4.446899] which lock already depends on the new lock.
[ 4.446899]
[ 4.447622]
[ 4.447622] the existing dependency chain (in reverse order) is:
[ 4.448297]
[ 4.448297] -> #1 ((completion)&abba.b_ready){+.+.}:
[ 4.448912] save_stack_trace+0x1e/0x2e
[ 4.449336] __lock_acquire+0x1554/0x1ea3
[ 4.449797] save_trace+0x0/0xfc
[ 4.450156] lock_acquire+0x25f/0x368
[ 4.450414] wait_for_common+0x1b/0x2b
[ 4.450414] __wait_for_common+0x72/0x44b
[ 4.450414] wait_for_common+0x1b/0x2b
[ 4.450414] mark_held_locks+0x98/0xcb
[ 4.450414] schedule_timeout+0x0/0x129
[ 4.450414] trace_hardirqs_on_caller+0x353/0x3ac
[ 4.450414] wait_for_common+0x1b/0x2b
[ 4.450414] wait_for_completion+0x1d/0x2c
[ 4.450414] test_abba+0x180/0x351
[ 4.450414] test_abba_work+0x0/0x167
[ 4.450414] test_abba+0x14c/0x351
[ 4.450414] complete+0x1d/0x95
[ 4.450414] ww_acquire_fini+0x20/0xca
[ 4.450414] test_aa+0x161/0x17a
[ 4.450414] test_aa+0x4d/0x17a
[ 4.450414] test_ww_mutex_init+0x17f/0x694
[ 4.450414] _raw_spin_unlock_irqrestore+0xbb/0x13e
[ 4.450414] add_device_randomness+0x29d/0x368
[ 4.450414] test_ww_mutex_init+0x0/0x694
[ 4.450414] do_one_initcall+0x108/0x279
[ 4.450414] do_early_param+0xee/0x1a1
[ 4.450414] kernel_init_freeable+0x2b6/0x494
[ 4.450414] kernel_init_freeable+0x2b6/0x494
[ 4.450414] kernel_init_freeable+0x2ed/0x494
[ 4.450414] kernel_init+0x0/0x231
[ 4.450414] kernel_init+0x13/0x231
[ 4.450414] ret_from_fork+0x19/0x30
[ 4.450414]
[ 4.450414] -> #0 (ww_class_mutex){+.+.}:
[ 4.450414] test_abba_work+0x3b/0x167
[ 4.450414]
[ 4.450414] other info that might help us debug this:
[ 4.450414]
[ 4.450414] Possible unsafe locking scenario by crosslock:
[ 4.450414]
[ 4.450414] CPU0 CPU1
[ 4.450414] ---- ----
[ 4.450414] lock(ww_class_mutex);
[ 4.450414] lock((completion)&abba.b_ready);
[ 4.450414] lock(ww_class_mutex);
[ 4.450414] unlock((completion)&abba.b_ready);
[ 4.450414]
[ 4.450414] *** DEADLOCK ***
[ 4.450414]
[ 4.450414] 5 locks held by kworker/0:1/15:
[ 4.450414] #0: ("events"){+.+.}, at: [<b10b18cc>] process_one_work+0x210/0x9bd
[ 4.450414] #1: ((&abba.work)){+.+.}, at: [<b10b18cc>] process_one_work+0x210/0x9bd
[ 4.450414] #2: (ww_class_acquire){+.+.}, at: [<b110af7b>] test_abba_work+0x24/0x167
[ 4.450414] #3: (ww_class_mutex){+.+.}, at: [<b110af92>] test_abba_work+0x3b/0x167
[ 4.450414] #4: (&x->wait#6){....}, at: [<b10edca2>] complete+0x1d/0x95
[ 4.450414]
[ 4.450414] stack backtrace:
[ 4.450414] CPU: 0 PID: 15 Comm: kworker/0:1 Not tainted 4.14.0-rc6-00050-g2dcd5ad #1
[ 4.450414] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 4.450414] Workqueue: events test_abba_work
[ 4.450414] Call Trace:
[ 4.450414] ? dump_stack+0x1a0/0x240
[ 4.450414] ? print_circular_bug+0x5b7/0x5d0
[ 4.450414] ? check_prev_add+0xaf/0x448
[ 4.450414] ? lock_commit_crosslock+0x660/0x6ac
[ 4.450414] ? debug_locks_off_graph_unlock+0x35/0x35
[ 4.450414] ? complete+0x35/0x95
[ 4.450414] ? test_abba_work+0x57/0x167
[ 4.450414] ? process_one_work+0x47f/0x9bd
[ 4.450414] ? worker_thread+0x371/0x594
[ 4.450414] ? kthread+0x1f3/0x206
[ 4.450414] ? mod_delayed_work_on+0xf1/0xf1
[ 4.450414] ? list_del_init+0x63/0x63
[ 4.450414] ? ret_from_fork+0x19/0x30
[ 4.981673] tsc: Refined TSC clocksource calibration: 2925.995 MHz
[ 4.982283] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2a2d2f8b9e6, max_idle_ns: 440795279943 ns
[ 10.597299] rcu-perf:--- Start of test: nreaders=0 nwriters=1 verbose=1 shutdown=1
[ 10.598377] rcu-torture: Creating rcu_perf_shutdown task
[ 10.613441] rcu-torture: Creating rcu_perf_writer task
[ 10.623613] rcu-perf: rcu_perf_writer task started
[ 11.164456] workingset: timestamp_bits=30 max_order=16 bucket_order=0
[ 11.165375] zbud: loaded
[ 11.165887] ntfs: driver 2.1.32 [Flags: R/O DEBUG].
[ 11.225456] gfs2: GFS2 installed
[ 11.234806] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
[ 11.235535] io scheduler noop registered (default)
[ 11.235973] io scheduler mq-deadline registered
To reproduce:
git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
Thanks,
Xiaolong
View attachment "config-4.14.0-rc6-00050-g2dcd5ad" of type "text/plain" (94249 bytes)
View attachment "job-script" of type "text/plain" (4210 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (12072 bytes)
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