From: Byungchul Park <byungchul.park@lge.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: mingo@kernel.org, tglx@linutronix.de, walken@google.com,
boqun.feng@gmail.com, kirill@shutemov.name,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, willy@infradead.org,
npiggin@gmail.com, kernel-team@lge.com
Subject: Re: [PATCH v8 00/14] lockdep: Implement crossrelease feature
Date: Thu, 10 Aug 2017 19:52:04 +0900 [thread overview]
Message-ID: <20170810105204.GC20323@X58A-UD3R> (raw)
In-Reply-To: <20170810005556.GU20323@X58A-UD3R>
On Thu, Aug 10, 2017 at 09:55:56AM +0900, Byungchul Park wrote:
> On Wed, Aug 09, 2017 at 05:50:59PM +0200, Peter Zijlstra wrote:
> >
> >
> > Heh, look what it does...
>
> It does not happen in my machine..
>
> I tihink it happens because of "Simplify xhlock ring buffer invalidation"
> patch of you.
I mis-understood your simplification patch. I think your patch works well
unless overwriting occurs - it doesn't work if overwriting occurs though.
Anyway, if crossrelease and lockdep report the following in a normal
condition, it would be a desirable result.
What do you think about the following report? Positive? Or negative?
>
> First of all, could you reverse yours and check if it happens, too?
> If not, we have to think the simplification more.
>
> BTW, does your patch consider the possibility that a worker and irqs can
> be nested? Is it no problem even in the case?
>
> >
> >
> > 4======================================================
> > 4WARNING: possible circular locking dependency detected
> > 4.13.0-rc2-00317-gadc6764a3adf-dirty #797 Tainted: G W
> > 4------------------------------------------------------
> > 4startpar/582 is trying to acquire lock:
> > c (c(complete)&barr->donec){+.+.}c, at: [<ffffffff8110de4d>] flush_work+0x1fd/0x2c0
> > 4
> > but task is already holding lock:
> > c (clockc#3c){+.+.}c, at: [<ffffffff8122e866>] lru_add_drain_all_cpuslocked+0x46/0x1a0
> > 4
> > which lock already depends on the new lock.
> >
> > 4
> > the existing dependency chain (in reverse order) is:
> >
> > -> #4c (clockc#3c){+.+.}c:
> > __lock_acquire+0x10a5/0x1100
> > lock_acquire+0xea/0x1f0
> > __mutex_lock+0x6c/0x960
> > mutex_lock_nested+0x1b/0x20
> > lru_add_drain_all_cpuslocked+0x46/0x1a0
> > lru_add_drain_all+0x13/0x20
> > SyS_mlockall+0xb8/0x1c0
> > entry_SYSCALL_64_fastpath+0x23/0xc2
> >
> > -> #3c (ccpu_hotplug_lock.rw_semc){++++}c:
> > __lock_acquire+0x10a5/0x1100
> > lock_acquire+0xea/0x1f0
> > cpus_read_lock+0x2a/0x90
> > kmem_cache_create+0x2a/0x1d0
> > scsi_init_sense_cache+0xa0/0xc0
> > scsi_add_host_with_dma+0x67/0x360
> > isci_pci_probe+0x873/0xc90
> > local_pci_probe+0x42/0xa0
> > work_for_cpu_fn+0x14/0x20
> > process_one_work+0x273/0x6b0
> > worker_thread+0x21b/0x3f0
> > kthread+0x147/0x180
> > ret_from_fork+0x2a/0x40
> >
> > -> #2c (cscsi_sense_cache_mutexc){+.+.}c:
> > __lock_acquire+0x10a5/0x1100
> > lock_acquire+0xea/0x1f0
> > __mutex_lock+0x6c/0x960
> > mutex_lock_nested+0x1b/0x20
> > scsi_init_sense_cache+0x3d/0xc0
> > scsi_add_host_with_dma+0x67/0x360
> > isci_pci_probe+0x873/0xc90
> > local_pci_probe+0x42/0xa0
> > work_for_cpu_fn+0x14/0x20
> > process_one_work+0x273/0x6b0
> > worker_thread+0x21b/0x3f0
> > kthread+0x147/0x180
> > ret_from_fork+0x2a/0x40
> >
> > -> #1c (c(&wfc.work)c){+.+.}c:
> > process_one_work+0x244/0x6b0
> > worker_thread+0x21b/0x3f0
> > kthread+0x147/0x180
> > ret_from_fork+0x2a/0x40
> > 0xffffffffffffffff
> >
> > -> #0c (c(complete)&barr->donec){+.+.}c:
> > check_prev_add+0x3be/0x700
> > __lock_acquire+0x10a5/0x1100
> > lock_acquire+0xea/0x1f0
> > wait_for_completion+0x3b/0x130
> > flush_work+0x1fd/0x2c0
> > lru_add_drain_all_cpuslocked+0x158/0x1a0
> > lru_add_drain_all+0x13/0x20
> > SyS_mlockall+0xb8/0x1c0
> > entry_SYSCALL_64_fastpath+0x23/0xc2
> >
> > other info that might help us debug this:
> >
> > Chain exists of:
> > c(complete)&barr->donec --> ccpu_hotplug_lock.rw_semc --> clockc#3c
> >
> > Possible unsafe locking scenario:
> >
> > CPU0 CPU1
> > ---- ----
> > lock(clockc#3c);
> > lock(ccpu_hotplug_lock.rw_semc);
> > lock(clockc#3c);
> > lock(c(complete)&barr->donec);
> >
> > *** DEADLOCK ***
> >
> > 2 locks held by startpar/582:
> > #0: c (ccpu_hotplug_lock.rw_semc){++++}c, at: [<ffffffff8122e9ce>] lru_add_drain_all+0xe/0x20
> > #1: c (clockc#3c){+.+.}c, at: [<ffffffff8122e866>] lru_add_drain_all_cpuslocked+0x46/0x1a0
> >
> > stack backtrace:
> > dCPU: 23 PID: 582 Comm: startpar Tainted: G W 4.13.0-rc2-00317-gadc6764a3adf-dirty #797
> > dHardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
> > dCall Trace:
> > d dump_stack+0x86/0xcf
> > d print_circular_bug+0x203/0x2f0
> > d check_prev_add+0x3be/0x700
> > d ? add_lock_to_list.isra.30+0xc0/0xc0
> > d ? is_bpf_text_address+0x82/0xe0
> > d ? unwind_get_return_address+0x1f/0x30
> > d __lock_acquire+0x10a5/0x1100
> > d ? __lock_acquire+0x10a5/0x1100
> > d ? add_lock_to_list.isra.30+0xc0/0xc0
> > d lock_acquire+0xea/0x1f0
> > d ? flush_work+0x1fd/0x2c0
> > d wait_for_completion+0x3b/0x130
> > d ? flush_work+0x1fd/0x2c0
> > d flush_work+0x1fd/0x2c0
> > d ? flush_workqueue_prep_pwqs+0x1c0/0x1c0
> > d ? trace_hardirqs_on+0xd/0x10
> > d lru_add_drain_all_cpuslocked+0x158/0x1a0
> > d lru_add_drain_all+0x13/0x20
> > d SyS_mlockall+0xb8/0x1c0
> > d entry_SYSCALL_64_fastpath+0x23/0xc2
> > dRIP: 0033:0x7f818d2e54c7
> > dRSP: 002b:00007fffcce83798 EFLAGS: 00000246c ORIG_RAX: 0000000000000097
> > dRAX: ffffffffffffffda RBX: 0000000000000046 RCX: 00007f818d2e54c7
> > dRDX: 0000000000000000 RSI: 00007fffcce83650 RDI: 0000000000000003
> > dRBP: 000000000002c010 R08: 0000000000000000 R09: 0000000000000000
> > dR10: 0000000000000008 R11: 0000000000000246 R12: 000000000002d000
> > dR13: 000000000002c010 R14: 0000000000001000 R15: 00007f818d599b00
next prev parent reply other threads:[~2017-08-10 10:53 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-07 7:12 [PATCH v8 00/14] lockdep: Implement crossrelease feature Byungchul Park
2017-08-07 7:12 ` [PATCH v8 01/14] lockdep: Refactor lookup_chain_cache() Byungchul Park
2017-08-10 12:18 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 02/14] lockdep: Add a function building a chain between two classes Byungchul Park
2017-08-10 12:18 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 03/14] lockdep: Change the meaning of check_prev_add()'s return value Byungchul Park
2017-08-10 12:19 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 04/14] lockdep: Make check_prev_add() able to handle external stack_trace Byungchul Park
2017-08-10 12:19 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 05/14] lockdep: Implement crossrelease feature Byungchul Park
2017-08-09 14:05 ` Peter Zijlstra
2017-08-10 1:30 ` Byungchul Park
2017-08-10 9:21 ` Peter Zijlstra
2017-08-10 12:19 ` [tip:locking/core] locking/lockdep: Implement the 'crossrelease' feature tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 06/14] lockdep: Detect and handle hist_lock ring buffer overwrite Byungchul Park
2017-08-09 14:16 ` Peter Zijlstra
2017-08-10 1:32 ` Byungchul Park
2017-08-10 9:22 ` Peter Zijlstra
2017-08-10 10:32 ` Byungchul Park
2017-08-10 11:59 ` Boqun Feng
2017-08-10 12:11 ` Byungchul Park
2017-08-10 12:51 ` Boqun Feng
2017-08-10 13:17 ` Boqun Feng
2017-08-11 0:44 ` Byungchul Park
2017-08-11 3:43 ` Byungchul Park
2017-08-11 8:03 ` Boqun Feng
2017-08-11 8:52 ` Byungchul Park
2017-08-11 9:44 ` Byungchul Park
2017-08-11 13:06 ` Byungchul Park
2017-08-14 7:05 ` Boqun Feng
2017-08-14 7:22 ` Byungchul Park
2017-08-14 7:29 ` Byungchul Park
2017-08-11 0:40 ` Byungchul Park
2017-08-11 1:03 ` Boqun Feng
2017-08-10 12:20 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 07/14] lockdep: Handle non(or multi)-acquisition of a crosslock Byungchul Park
2017-08-10 12:20 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 08/14] lockdep: Make print_circular_bug() aware of crossrelease Byungchul Park
2017-08-10 12:21 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-07 7:12 ` [PATCH v8 09/14] lockdep: Apply crossrelease to completions Byungchul Park
2017-08-07 10:20 ` kbuild test robot
2017-08-07 11:45 ` kbuild test robot
2017-08-09 9:51 ` Peter Zijlstra
2017-08-09 10:24 ` Peter Zijlstra
2017-08-10 1:24 ` Byungchul Park
2017-08-10 12:21 ` [tip:locking/core] locking/lockdep: " tip-bot for Byungchul Park
2017-08-14 8:50 ` [PATCH v8 09/14] lockdep: " Arnd Bergmann
2017-08-18 23:43 ` Boqun Feng
2017-08-19 12:51 ` Arnd Bergmann
2017-08-19 13:34 ` Arnd Bergmann
2017-08-23 14:43 ` Boqun Feng
2017-08-20 3:18 ` Boqun Feng
2017-08-07 7:12 ` [PATCH v8 10/14] pagemap.h: Remove trailing white space Byungchul Park
2017-08-07 7:12 ` [PATCH v8 11/14] lockdep: Apply crossrelease to PG_locked locks Byungchul Park
2017-08-07 10:36 ` kbuild test robot
2017-08-10 1:35 ` Byungchul Park
2017-08-10 9:25 ` Peter Zijlstra
2017-09-05 1:03 ` Byungchul Park
2017-08-07 7:12 ` [PATCH v8 12/14] lockdep: Apply lock_acquire(release) on __Set(__Clear)PageLocked Byungchul Park
2017-08-07 7:13 ` [PATCH v8 13/14] lockdep: Move data of CONFIG_LOCKDEP_PAGELOCK from page to page_ext Byungchul Park
2017-08-07 10:43 ` kbuild test robot
2017-08-07 7:13 ` [PATCH v8 14/14] lockdep: Crossrelease feature documentation Byungchul Park
2017-08-07 15:58 ` kbuild test robot
2017-08-10 12:22 ` [tip:locking/core] locking/lockdep: Add 'crossrelease' " tip-bot for Byungchul Park
2017-08-09 15:50 ` [PATCH v8 00/14] lockdep: Implement crossrelease feature Peter Zijlstra
2017-08-10 0:55 ` Byungchul Park
2017-08-10 3:47 ` Byungchul Park
2017-08-10 10:52 ` Byungchul Park [this message]
2017-08-10 9:37 ` Byungchul Park
2017-08-10 10:52 ` Peter Zijlstra
2017-08-10 11:10 ` Ingo Molnar
2017-08-10 11:45 ` Byungchul Park
2017-08-14 10:57 ` Ingo Molnar
2017-08-14 11:10 ` Byungchul Park
2017-08-15 8:20 ` Ingo Molnar
2017-08-16 0:16 ` Byungchul Park
2017-08-16 4:05 ` Boqun Feng
2017-08-16 4:37 ` Byungchul Park
2017-08-16 5:40 ` Boqun Feng
2017-08-16 6:37 ` Byungchul Park
2017-08-16 5:05 ` Byungchul Park
2017-08-16 5:58 ` Boqun Feng
2017-08-16 7:14 ` Byungchul Park
2017-08-16 8:06 ` Byungchul Park
2017-08-16 9:38 ` Byungchul Park
2017-08-17 7:48 ` Ingo Molnar
2017-08-17 8:04 ` Boqun Feng
2017-08-17 8:12 ` Ingo Molnar
2017-08-17 8:33 ` Boqun Feng
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