From: Hyeonggon Yoo <42.hyeyoo@gmail.com>
To: Byungchul Park <byungchul.park@lge.com>
Cc: torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com,
linux-ide@vger.kernel.org, adilger.kernel@dilger.ca,
linux-ext4@vger.kernel.org, mingo@redhat.com,
linux-kernel@vger.kernel.org, peterz@infradead.org,
will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org,
joel@joelfernandes.org, sashal@kernel.org,
daniel.vetter@ffwll.ch, chris@chris-wilson.co.uk,
duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org,
tytso@mit.edu, willy@infradead.org, david@fromorbit.com,
amir73il@gmail.com, bfields@fieldses.org,
gregkh@linuxfoundation.org, kernel-team@lge.com,
linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org,
minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com,
sj@kernel.org, jglisse@redhat.com, dennis@kernel.org,
cl@linux.com, penberg@kernel.org, rientjes@google.com,
vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org,
paolo.valente@linaro.org, josef@toxicpanda.com,
linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk,
jack@suse.cz, jack@suse.com, jlayton@kernel.org,
dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org,
dri-devel@lists.freedesktop.org, airlied@linux.ie,
rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com,
hamohammed.sa@gmail.com
Subject: Re: [PATCH v4 00/24] DEPT(Dependency Tracker)
Date: Sat, 12 Mar 2022 01:53:26 +0000 [thread overview]
Message-ID: <Yiv9Fn4kcRbXJLmu@ip-172-31-19-208.ap-northeast-1.compute.internal> (raw)
In-Reply-To: <1646377603-19730-1-git-send-email-byungchul.park@lge.com>
On Fri, Mar 04, 2022 at 04:06:19PM +0900, Byungchul Park wrote:
> Hi Linus and folks,
>
> I've been developing a tool for detecting deadlock possibilities by
> tracking wait/event rather than lock(?) acquisition order to try to
> cover all synchonization machanisms. It's done on v5.17-rc1 tag.
>
> https://github.com/lgebyungchulpark/linux-dept/commits/dept1.14_on_v5.17-rc1
>
Small feedback unrelated to thread:
I'm not sure "Need to expand the ring buffer" is something to call
WARN(). Is this stack trace useful for something?
========
Hello Byungchul. These are two warnings of DEPT on system.
Both cases look similar.
In what case DEPT says (unknown)?
I'm not sure we can properly debug this.
===================================================
DEPT: Circular dependency has been detected.
5.17.0-rc1+ #3 Tainted: G W
---------------------------------------------------
summary
---------------------------------------------------
*** AA DEADLOCK ***
context A
[S] (unknown)(&vfork:0)
[W] wait_for_completion_killable(&vfork:0)
[E] complete(&vfork:0)
[S]: start of the event context
[W]: the wait blocked
[E]: the event not reachable
---------------------------------------------------
context A's detail
---------------------------------------------------
context A
[S] (unknown)(&vfork:0)
[W] wait_for_completion_killable(&vfork:0)
[E] complete(&vfork:0)
[S] (unknown)(&vfork:0):
(N/A)
[W] wait_for_completion_killable(&vfork:0):
[<ffffffc00802204c>] kernel_clone+0x25c/0x2b8
stacktrace:
dept_wait+0x74/0x88
wait_for_completion_killable+0x60/0xa0
kernel_clone+0x25c/0x2b8
__do_sys_clone+0x5c/0x74
__arm64_sys_clone+0x18/0x20
invoke_syscall.constprop.0+0x78/0xc4
do_el0_svc+0x98/0xd0
el0_svc+0x44/0xe4
el0t_64_sync_handler+0xb0/0x12c
el0t_64_sync+0x158/0x15c
[E] complete(&vfork:0):
[<ffffffc00801f49c>] mm_release+0x7c/0x90
stacktrace:
dept_event+0xe0/0x100
complete+0x48/0x98
mm_release+0x7c/0x90
exit_mm_release+0xc/0x14
do_exit+0x1b4/0x81c
do_group_exit+0x30/0x9c
__wake_up_parent+0x0/0x24
invoke_syscall.constprop.0+0x78/0xc4
do_el0_svc+0x98/0xd0
el0_svc+0x44/0xe4
el0t_64_sync_handler+0xb0/0x12c
el0t_64_sync+0x158/0x15c
---------------------------------------------------
information that might be helpful
---------------------------------------------------
CPU: 6 PID: 229 Comm: start-stop-daem Tainted: G W 5.17.0-rc1+ #3
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace.part.0+0x9c/0xc4
show_stack+0x14/0x28
dump_stack_lvl+0x9c/0xcc
dump_stack+0x14/0x2c
print_circle+0x2d4/0x438
cb_check_dl+0x44/0x70
bfs+0x60/0x168
add_dep+0x88/0x11c
do_event.constprop.0+0x19c/0x2c0
dept_event+0xe0/0x100
complete+0x48/0x98
mm_release+0x7c/0x90
exit_mm_release+0xc/0x14
do_exit+0x1b4/0x81c
do_group_exit+0x30/0x9c
__wake_up_parent+0x0/0x24
invoke_syscall.constprop.0+0x78/0xc4
do_el0_svc+0x98/0xd0
el0_svc+0x44/0xe4
el0t_64_sync_handler+0xb0/0x12c
el0t_64_sync+0x158/0x15c
===================================================
DEPT: Circular dependency has been detected.
5.17.0-rc1+ #3 Tainted: G W
---------------------------------------------------
summary
---------------------------------------------------
*** AA DEADLOCK ***
context A
[S] (unknown)(&try_completion:0)
[W] wait_for_completion_timeout(&try_completion:0)
[E] complete(&try_completion:0)
[S]: start of the event context
[W]: the wait blocked
[E]: the event not reachable
---------------------------------------------------
context A's detail
---------------------------------------------------
context A
[S] (unknown)(&try_completion:0)
[W] wait_for_completion_timeout(&try_completion:0)
[E] complete(&try_completion:0)
[S] (unknown)(&try_completion:0):
(N/A)
[W] wait_for_completion_timeout(&try_completion:0):
[<ffffffc008166bf4>] kunit_try_catch_run+0xb4/0x160
stacktrace:
dept_wait+0x74/0x88
wait_for_completion_timeout+0x64/0xa0
kunit_try_catch_run+0xb4/0x160
kunit_test_try_catch_successful_try_no_catch+0x3c/0x98
kunit_try_run_case+0x9c/0xa0
kunit_generic_run_threadfn_adapter+0x1c/0x28
kthread+0xd4/0xe4
ret_from_fork+0x10/0x20
[E] complete(&try_completion:0):
[<ffffffc00803dce4>] kthread_complete_and_exit+0x18/0x20
stacktrace:
dept_event+0xe0/0x100
complete+0x48/0x98
kthread_complete_and_exit+0x18/0x20
kunit_try_catch_throw+0x0/0x1c
kthread+0xd4/0xe4
ret_from_fork+0x10/0x20
---------------------------------------------------
information that might be helpful
---------------------------------------------------
CPU: 15 PID: 132 Comm: kunit_try_catch Tainted: G W 5.17.0-rc1+ #3
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace.part.0+0x9c/0xc4
show_stack+0x14/0x28
dump_stack_lvl+0x9c/0xcc
dump_stack+0x14/0x2c
print_circle+0x2d4/0x438
cb_check_dl+0x44/0x70
bfs+0x60/0x168
add_dep+0x88/0x11c
do_event.constprop.0+0x19c/0x2c0
dept_event+0xe0/0x100
complete+0x48/0x98
kthread_complete_and_exit+0x18/0x20
kunit_try_catch_throw+0x0/0x1c
kthread+0xd4/0xe4
ret_from_fork+0x10/0x20
> Benifit:
>
> 0. Works with all lock primitives.
> 1. Works with wait_for_completion()/complete().
> 2. Works with 'wait' on PG_locked.
> 3. Works with 'wait' on PG_writeback.
> 4. Works with swait/wakeup.
> 5. Works with waitqueue.
> 6. Multiple reports are allowed.
> 7. Deduplication control on multiple reports.
> 8. Withstand false positives thanks to 6.
> 9. Easy to tag any wait/event.
>
> Future work:
[...]
> --
> 1.9.1
>
--
Thank you, You are awesome!
Hyeonggon :-)
next prev parent reply other threads:[~2022-03-12 1:53 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-04 7:06 [PATCH v4 00/24] DEPT(Dependency Tracker) Byungchul Park
2022-03-04 7:06 ` [PATCH v4 01/24] llist: Move llist_{head,node} definition to types.h Byungchul Park
2022-03-04 7:06 ` [PATCH v4 02/24] dept: Implement Dept(Dependency Tracker) Byungchul Park
2022-03-09 7:21 ` kernel test robot
2022-03-09 23:43 ` kernel test robot
2022-03-04 7:06 ` [PATCH v4 03/24] dept: Embed Dept data in Lockdep Byungchul Park
2022-03-04 7:06 ` [PATCH v4 04/24] dept: Add a API for skipping dependency check temporarily Byungchul Park
2022-03-04 7:06 ` [PATCH v4 05/24] dept: Apply Dept to spinlock Byungchul Park
2022-03-04 7:06 ` [PATCH v4 06/24] dept: Apply Dept to mutex families Byungchul Park
2022-03-04 7:06 ` [PATCH v4 07/24] dept: Apply Dept to rwlock Byungchul Park
2022-03-04 7:06 ` [PATCH v4 08/24] dept: Apply Dept to wait_for_completion()/complete() Byungchul Park
2022-03-04 7:06 ` [PATCH v4 09/24] dept: Apply Dept to seqlock Byungchul Park
2022-03-04 7:06 ` [PATCH v4 10/24] dept: Apply Dept to rwsem Byungchul Park
2022-03-04 7:06 ` [PATCH v4 11/24] dept: Add proc knobs to show stats and dependency graph Byungchul Park
2022-03-10 7:43 ` kernel test robot
2022-03-04 7:06 ` [PATCH v4 12/24] dept: Introduce split map concept and new APIs for them Byungchul Park
2022-03-04 7:06 ` [PATCH v4 13/24] dept: Apply Dept to wait/event of PG_{locked,writeback} Byungchul Park
2022-03-04 7:06 ` [PATCH v4 14/24] dept: Apply SDT to swait Byungchul Park
2022-03-09 9:14 ` kernel test robot
2022-03-04 7:06 ` [PATCH v4 15/24] dept: Apply SDT to wait(waitqueue) Byungchul Park
2022-03-04 7:06 ` [PATCH v4 16/24] locking/lockdep, cpu/hotplus: Use a weaker annotation in AP thread Byungchul Park
2022-03-04 19:28 ` Sergei Shtylyov
2022-03-04 23:36 ` Byungchul Park
2022-03-04 7:06 ` [PATCH v4 17/24] dept: Distinguish each syscall context from another Byungchul Park
2022-03-04 7:06 ` [PATCH v4 18/24] dept: Distinguish each work " Byungchul Park
2022-03-04 7:06 ` [PATCH v4 19/24] dept: Disable Dept within the wait_bit layer by default Byungchul Park
2022-03-04 7:06 ` [PATCH v4 20/24] dept: Add nocheck version of init_completion() Byungchul Park
2022-03-04 7:06 ` [PATCH v4 21/24] dept: Disable Dept on struct crypto_larval's completion for now Byungchul Park
2022-03-04 7:06 ` [PATCH v4 22/24] dept: Don't create dependencies between different depths in any case Byungchul Park
2022-03-04 11:39 ` Hyeonggon Yoo
2022-03-04 23:38 ` Byungchul Park
2022-03-04 7:06 ` [PATCH v4 23/24] dept: Let it work with real sleeps in __schedule() Byungchul Park
2022-03-04 7:06 ` [PATCH v4 24/24] dept: Disable Dept on that map once it's been handled until next turn Byungchul Park
2022-03-12 1:53 ` Hyeonggon Yoo [this message]
2022-03-14 6:59 ` [PATCH v4 00/24] DEPT(Dependency Tracker) Byungchul Park
2022-03-15 12:04 ` Hyeonggon Yoo
2022-03-16 4:32 ` Byungchul Park
2022-03-16 9:30 ` Hyeonggon Yoo
2022-03-18 7:51 ` Byungchul Park
2022-03-20 10:57 ` Byungchul Park
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Yiv9Fn4kcRbXJLmu@ip-172-31-19-208.ap-northeast-1.compute.internal \
--to=42.hyeyoo@gmail.com \
--cc=adilger.kernel@dilger.ca \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=amir73il@gmail.com \
--cc=bfields@fieldses.org \
--cc=byungchul.park@lge.com \
--cc=chris@chris-wilson.co.uk \
--cc=cl@linux.com \
--cc=damien.lemoal@opensource.wdc.com \
--cc=dan.j.williams@intel.com \
--cc=daniel.vetter@ffwll.ch \
--cc=david@fromorbit.com \
--cc=dennis@kernel.org \
--cc=djwong@kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=duyuyang@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=hamohammed.sa@gmail.com \
--cc=hannes@cmpxchg.org \
--cc=hch@infradead.org \
--cc=jack@suse.com \
--cc=jack@suse.cz \
--cc=jglisse@redhat.com \
--cc=jlayton@kernel.org \
--cc=joel@joelfernandes.org \
--cc=johannes.berg@intel.com \
--cc=josef@toxicpanda.com \
--cc=kernel-team@lge.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-ext4@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=melissa.srw@gmail.com \
--cc=mhocko@kernel.org \
--cc=minchan@kernel.org \
--cc=mingo@redhat.com \
--cc=ngupta@vflare.org \
--cc=paolo.valente@linaro.org \
--cc=penberg@kernel.org \
--cc=peterz@infradead.org \
--cc=rientjes@google.com \
--cc=rodrigosiqueiramelo@gmail.com \
--cc=rostedt@goodmis.org \
--cc=sashal@kernel.org \
--cc=sj@kernel.org \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=tytso@mit.edu \
--cc=vbabka@suse.cz \
--cc=vdavydov.dev@gmail.com \
--cc=viro@zeniv.linux.org.uk \
--cc=will@kernel.org \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).