NetBSD Problem Report #54617

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	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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 <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&#39;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

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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:

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