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IDS Forum

Server hangs with "mutex wait nsf.lock"

Posted By:
Date:

Long post..

this occurs a few times a week. Shared memory connections work fine,
tcp connections will "hang". So when this condition occurs, it seems as
if all sessions no longer get served except for one. I have seen this
occur with as little as 2 sessions. If I fire up a new dbaccess
session, my window will show up blank and hang and will not show up in
onstat -u.. The session that is doing the blocking usually clears in a
minute or two, but occasionally blocks longer ( most we let it go was 30
minutes in a test). If it takes more than a couple of minutes, we
bounce the engine. When bringing down, there is an error something
like, "server not responding, timed out after 120 seconds" although the
server is brought down.

E450 with 4 procs.
Informix Dynamic Server Version 9.30.UC3
Solaris 2.6

Basically a blob image file server. Blobs ranging from 1k to 1G are
stored and served from machine.

Has anyone experienced this "mutex wait nsf.lock" behavior? Informix
tech support has been looking into this, but they have been unsuccessful
in diagnosing.

All shortened for space..

onconfig

----------
## Tried several different NETTYPE configs.. currently

NETTYPE ipcshm,1,50,CPU # Configure poll thread(s) for nettype
#NETTYPE tlitcp,2,50,NET # Configure poll thread(s) for nettype
NETTYPE tlitcp,2,300,CPU # Configure poll thread(s) for nettype

MULTIPROCESSOR 1 # 0 for single-processor, 1 for
multi-processor
NUMCPUVPS 3 # Number of user (cpu) vps
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps
to one

NOAGE 1 # Process aging
## Messed with this. Tried AFF and no AFF and AFF 2 processors etc..
same problem.
AFF_SPROC 0 # Affinity start processor
AFF_NPROCS 0 # Affinity number of processors
----------

onstat -u
==== the sessions with "S" appear hung.
---------
14152b34 ---P--- 11338 testftp - 0 0 1 250 0
14154344 ---P--- 13400 testftp - 0 0 1 250 0
1415977c S--P--- 13396 testftp - 1417fdc8 0 0 23500 0
1415a384 ---P--- 13401 testftp - 0 0 1 250 0
1415a988 S--P--- 13398 informix 2 1417fdc8 0 0 27500 0
---------

onstat -g ath
---------
11422 14d1ddc0 14152b34 2 sleeping forever 1cpu sqlexec
13480 14f2c778 1415977c 2 mutex wait nsf.lock 1cpu sqlexec
13482 159451b8 1415a988 2 mutex wait nsf.lock 1cpu srvinfx
13484 14dcc2b0 14154344 3 running 4cpu sqlexec
13485 14ce1ed0 1415a384 2 sleeping forever 1cpu sqlexec
---------

onstat -g lmx:
----------
Locked mutexes:
mid addr name holder lkcnt waiter waittime
3258 1417fdc8 nsf.lock 13484 0 13 986
13482 972
13480 757
5757 15287988 slcommon_ct 13480 0
6020 15945840 slcommon_ct 13482 0

Number of mutexes on VP free lists: 568
----------

onstat -g wmx:
-----------
Mutexes with waiters:
mid addr name holder lkcnt waiter waittime
3258 1417fdc8 nsf.lock 13484 0 13 986
13482 972
13480 757

Number of mutexes on VP free lists: 568
-----------
onstat -k all
---------
Stack for thread: 13484 sqlexec <--looks like session blocking others.
base: 0x14ce6000
len: 36864
pc: 0x006995b8
tos: 0x14cee848
state: running
vp: 4

Stack for thread: 13482 srvinfx <--- looks like a "blocked" session
base: 0x14cc1000
len: 36864
pc: 0x006995b8
tos: 0x14cc9778
state: mutex wait
vp: 1

0x00691580 (oninit)mt_lock_wait(0xa8b428, 0xa8b400, 0x2, 0x1417fdc8,
0x1, 0x0)
0x006916f8 (oninit)mt_lock (0x1417fdc8, 0x1417fdc8, 0x0, 0x1400a8e0,
0x0, 0x1400a8a0)
0x006e3fa0 (oninit)sl_lock (0x1457c6d0, 0x157b6d88, 0x7, 0x1400a8e0,
0x14cc99cc, 0x1400a8a0)
0x006e3350 (oninit)net_nsf_closefd(0x9581f8, 0x14ca5e30, 0x14cc9a3c,
0xa, 0x4, 0x14ca5e30)
0x00717640 (oninit)disctli (0x4, 0xa, 0x14d07d04, 0x14ca5e30,
0x15d95da8, 0x1)
0x007066b8 (oninit)tlDiscon(0x14cdf030, 0xa, 0x2, 0x2, 0x1, 0xa9f1b8)
0x007037fc (oninit)slSQIdiscon(0xa, 0xa, 0xffffffff, 0x147b7d1c, 0x0,
0x14d07d04)
0x006fe050 (oninit)pfDiscon(0x14cdf030, 0x147b7ca8, 0x14cc9d5c, 0x0,
0xa, 0x14d07d04)
0x006f5aac (oninit)cmDiscon(0x14cdf0a8, 0xa, 0x14cc9d5c, 0xa,
0x14cdf030, 0x14cc9c38)
0x006f2a08 (oninit)ascAbort(0x14d07d04, 0x14cdf0a8, 0x14cc9d58, 0x0,
0x14cdf0a8, 0xef508c10)
0x006d22a0 (oninit)asfExit (0x1, 0x0, 0x0, 0x14cdf0a8, 0x14cdf030,
0x14cc9d58)
0x006d2078 (oninit)ASF_Call(0xa0, 0x0, 0x14cdf0a8, 0xa, 0x14cc9d58,
0x14cc9d61)
0x003c5bc8 (oninit)sqscb_cleanup(0xa91400, 0x927400, 0xa85000, 0x1000,
0xa9174c, 0x1)
0x0069e034 (oninit)destroy_session(0x927400, 0xa7bc00, 0xa7bf2c,
0x14119950, 0x927438, 0x14119950
)
0x0039c18c (oninit)sq_exit (0xa7b800, 0x0, 0x14d07018, 0x0, 0x1470f018,
0x4e)
0x0039810c (oninit)sqmain (0x38, 0xa91400, 0x927400, 0xa85004, 0x1,
0x94c6c4)
0x00699b38 (oninit)startup (0xa8b400, 0x0, 0x0, 0x1400a8e0, 0x1462a018,
0x1400a8a0)
0x0068dd6c (oninit)idle_processor(0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
0x00000000 (*nosymtab*)0x0

---------

Box is under very low load..

---------
mpstat 1 5
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
0 7 0 426 126 115 197 11 12 28 0 2017 17 7
0 76
1 6 0 560 408 200 146 10 10 20 0 2116 27 10
0 63
2 6 0 312 111 100 133 10 10 20 0 3120 27 11
0 61
3 6 0 269 265 259 85 6 6 19 0 1783 31 13
0 56
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
0 0 0 0 100 100 18 0 1 0 0 7 0 0 0
100
1 3 0 312 400 200 34 0 0 1 0 39 0 0 0
100
2 0 0 0 101 100 15 0 2 0 0 16 0 0 0
100
3 0 0 0 104 104 2 0 1 0 0 0 0 0 0
100
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
0 0 0 0 100 100 16 0 1 0 0 23 0 0 0
100
1 0 0 312 400 200 34 0 0 0 0 32 0 0 0
100
2 0 0 0 103 103 22 0 1 0 0 19 0 0 0
100
3 0 0 0 102 102 4 0 1 0 0 4 0 0 0
100
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
0 0 0 0 104 104 28 0 0 2 0 13 0 0 0
100
1 0 0 312 404 204 36 0 0 2 0 16 0 0 0
100
2 0 0 0 100 100 20 0 2 0 0 21 0 0 0
100
3 0 0 0 107 107 1 0 0 0 0 0 0 0 0
100
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
0 0 0 0 100 100 6 0 1 0 0 3 0 0 0
100
1 0 0 4758 400 200 36 0 1 0 0 40 0 2
0 98
2 0 0 0 102 101 25 0 3 0 0 19 0 0 0
100
3 0 0 0 104 104 1 0 0 0 0 0 0 0 0
100
----------
vmstat 1 5
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s0 s1 s6 s5 in sy cs us
sy id
0 0 0 16568 2432 0 26 16 0 2 0 0 1 1 0 0 811 533 563 26
11 64
0 0 0 2203024 40896 0 3 0 0 0 0 0 0 0 0 0 603 127 86
0 0 100
0 0 0 2203024 40896 0 0 0 0 0 0 0 0 0 0 0 608 57 55
0 0 100
0 0 0 2203024 40896 0 0 0 0 0 0 0 0 0 0 0 605 73 65
0 0 100
0 0 0 2203024 40896 0 0 0 0 0 0 0 0 0 0 0 608 103 98
0 0 100

---------

Patrick McDonough

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