NetBSD Problem Report #54617
From www@netbsd.org Mon Oct 14 11:58:28 2019
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by mollari.NetBSD.org (Postfix) with ESMTPS id 66E807A18D
for <gnats-bugs@gnats.NetBSD.org>; Mon, 14 Oct 2019 11:58:28 +0000 (UTC)
Message-Id: <20191014115827.765A07A24F@mollari.NetBSD.org>
Date: Mon, 14 Oct 2019 11:58:27 +0000 (UTC)
From: asjdoran@gmail.com
Reply-To: asjdoran@gmail.com
To: gnats-bugs@NetBSD.org
Subject: deadlock between sysmon and onewire drivers
X-Send-Pr-Version: www-1.0
>Number: 54617
>Category: kern
>Synopsis: deadlock between sysmon and onewire drivers
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: martin
>State: closed
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Oct 14 12:00:00 +0000 2019
>Closed-Date: Fri Oct 25 16:27:07 +0000 2019
>Last-Modified: Fri Oct 25 16:30:01 +0000 2019
>Originator: Andrew Doran
>Release: 8.1
>Organization:
Andrew Doran
>Environment:
NetBSD steamy.local 8.1_STABLE NetBSD 8.1_STABLE (GENERIC) #1: Sat Oct 5 23:56:59 IST 2019 ad@steamy.local:/local/home/ad/src-81/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
Processing an envstat(1) invocation. sme_global_mtx is acquired, and then owtemp_refresh() called to read the sensor data. In turn this attempts to acquire the onewire rwlock, which is already held:
crash> t/a fffffe80795274e0
trace: pid 6734 lid 1 at 0xffff800043f66b10
sleepq_block() at sleepq_block+0x97
turnstile_block() at turnstile_block+0x24f
rw_vector_enter() at rw_vector_enter+0x120
owtemp_refresh() at owtemp_refresh+0x22
sysmon_envsys_refresh_sensor() at sysmon_envsys_refresh_sensor+0x80
sme_update_dictionary() at sme_update_dictionary+0xca
sysmonioctl_envsys() at sysmonioctl_envsys+0x28e
VOP_IOCTL() at VOP_IOCTL+0x54
vn_ioctl() at vn_ioctl+0xa6
sys_ioctl() at sys_ioctl+0x11a
syscall() at syscall+0x1ec
--- syscall (number 54) ---
7c68590ff13a:
crash> ps/w | grep 6734
6734 1 envstat netbsd 43 tstile fffffe807decfe10
crash> x/Lx fffffe807decfe10
fffffe807decfe10: fffffe807d004ba7
crash> ps | grep fffffe807d004ba
0 74 3 0 200 fffffe807d004ba0 onewire0 tstile
Concurrently, onewire_thread() thinks the device is gone. This kthread holds the onewire rwlock, and during the detach attempts to acquire sme_global_mtx:
crash> t/a fffffe807d004ba0
trace: pid 0 lid 74 at 0xffff800043f0ae00
sleepq_block() at sleepq_block+0x97
turnstile_block() at turnstile_block+0x24f
mutex_vector_enter() at mutex_vector_enter+0x34a
sysmon_envsys_unregister() at sysmon_envsys_unregister+0x16
owtemp_detach() at owtemp_detach+0x15
config_detach() at config_detach+0xa1
onewire_thread() at onewire_thread+0x283
>How-To-Repeat:
Drive some devices via owtemp & call envstat regularly.
>Fix:
None offered. I suspect this is a pattern repeated elsewhere.
>Release-Note:
>Audit-Trail:
From: Andrew Doran <asjdoran@gmail.com>
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: kern/54617: deadlock between sysmon and onewire drivers
Date: Fri, 25 Oct 2019 14:32:25 +0100
--000000000000e9a6500595bc2e10
Content-Type: text/plain; charset="UTF-8"
Fix attached. I have no commit privs. Description:
onewire:
- Alter locking strategy to avoid deadlock on detach.
- Auto bus probe chews CPU. Increase interval from 3s to 10s.
- Put temp sensor S/N in dev description so it can be identified.
- Use mutex/condvar.
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`
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<div dir=3D"ltr"><div>Fix attached.=C2=A0 I have no commit privs.=C2=A0 Des=
cription:</div><div><br></div><div>onewire:</div><div>- Alter locking strat=
egy to avoid deadlock on detach.<br></div><div>- Auto bus probe chews CPU.=
=C2=A0 Increase interval from 3s to 10s.</div><div>- Put temp sensor S/N in=
dev description so it can be identified.</div><div><div>- Use mutex/condva=
r.<br></div></div><div><br></div><div>begin 644 onewire.diff.gz<br>M'XL=
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--000000000000e9a6500595bc2e10--
From: Andrew Doran <asjdoran@gmail.com>
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: kern/54617: deadlock between sysmon and onewire drivers
Date: Fri, 25 Oct 2019 15:27:29 +0100
--000000000000d802b20595bcf3ea
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--000000000000d802b20595bcf3ea--
Responsible-Changed-From-To: kern-bug-people->martin
Responsible-Changed-By: martin@NetBSD.org
Responsible-Changed-When: Fri, 25 Oct 2019 16:27:07 +0000
Responsible-Changed-Why:
Take
State-Changed-From-To: open->closed
State-Changed-By: martin@NetBSD.org
State-Changed-When: Fri, 25 Oct 2019 16:27:07 +0000
State-Changed-Why:
Patch applied - thanks!
From: "Martin Husemann" <martin@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc:
Subject: PR/54617 CVS commit: src/sys/dev/onewire
Date: Fri, 25 Oct 2019 16:25:15 +0000
Module Name: src
Committed By: martin
Date: Fri Oct 25 16:25:14 UTC 2019
Modified Files:
src/sys/dev/onewire: onewire.c onewirereg.h owtemp.c
Log Message:
PR kern/54617: onewire(4):
- Alter locking strategy to avoid deadlock on detach.
- Auto bus probe chews CPU. Increase interval from 3s to 10s.
- Put temp sensor S/N in dev description so it can be identified.
- Use mutex/condvar.
Patch from Andrew Doran.
To generate a diff of this commit:
cvs rdiff -u -r1.16 -r1.17 src/sys/dev/onewire/onewire.c
cvs rdiff -u -r1.3 -r1.4 src/sys/dev/onewire/onewirereg.h
cvs rdiff -u -r1.17 -r1.18 src/sys/dev/onewire/owtemp.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
>Unformatted:
(Contact us)
$NetBSD: query-full-pr,v 1.43 2018/01/16 07:36:43 maya Exp $
$NetBSD: gnats_config.sh,v 1.9 2014/08/02 14:16:04 spz Exp $
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