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Date:      Fri, 13 Sep 1996 05:18:12 -0400 (EDT)
From:      bill@twwells.com (T. William Wells)
To:        freebsd-questions@freebsd.org
Subject:   gratuitous system hangs -- 2.1.5
Message-ID:  <m0v1UO4-00011uC@twwells.com>

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I posted the bulk of this message before but got no answers....

In addition to the original post, which I've included at the end
of this new text, I have this (slightly edited) vmstat. Yes, the
vmstat kept running through the crash; I got this output by
having been telnetted in and capturing the vmstat on another
machine.

 procs      memory     page                       disks       faults      cpu
 r  b  w    avm   fre  flt  re  pi  po   fr    sr s0 s1   in    sy  cs us sy id
 3  0  0 421488  5144  619  17   1   0  616    0   4 13  434  1299 189 13 25 62
 2  1  0 397596  5048  532   3   1   0  535    0   4 12  481  1062 189  9 15 76
 2  0  0 379872  5736  439   3   0   0  464    0   2 10  480   932 195  8 15 77
 4  1  0 401056  4832 1213  19   3   0 1146    0   3 18  544  1985 262 14 31 55
**presumably, this is where things started going wrong....
19 36  0 610428  1664 1182  17   6   0 1039    0  19 45  564  1650 296 22 38 41
60 37  3 764756   220 1374   0  14  47 1076 6787  45 56  769  2394 518 11 45 43
16 45 21 704324  2228  629   0  17  36  636 4358  48 49  590  1601 433 15 39 46
13 34 17 664476  5336   34   1   3  51  101 4375  55 47  515 10320 210  7 38 56
14 36  0 544712  8192   48   1   3  18   53 7460  22  1  374   413 127  2 22 75
14 36  0 516176  7940   19   0   1   0   10    0   2  1  359   456 137  1  6 93
14 36  0 376420  7916   11   0   2   0   15    0   5  2  356   439 137  3  8 89
14 36  0 363124  8120    8   1   1   0   25    0   3  2  358   544 131  6  8 86
14 36  0 322944  8476   22   0   0   0   42    0   0  1  316   261  80  2  3 95
14 36  0 318748  9440   61   0   1   0  107    0  10 12  347   345 103  2  8 90
15 37  0 307268 10072   51   0   4   0   88    0   4  2  337   325 104  2  5 93
15 37  0 296872 10028    3   0   1   0    2    0   0  1  326   307  76  3  5 92
15 37  0 311468  9052   48   0  10   0   37    0   4  9  355   428 117  4  7 89
17 38  1 313476  9384   24   0   2   0   44    0   1  1  326   335  87  3  4 93
15 37  0 303860  9496   59   0   7   0   67    0   7  2  338   345  93  3  6 91
16 38  0 300732  9408    9   0   2   0    5    0   6 12  363   421 115  4  6 90
16 38  0 286192  9800   23   0   1   0   43    0   0  0  297   278  73  3  5 92
16 38  0 273460 10236    8   0   1   0   31    0   0  2  291   182  47  1  2 97

One other, possibly irrelevant, datum. There seems to be an
unusual number of processes in "lock_write" state, says the
results of a ps taken via ddb during the crash.

------------
I've been having some unexplained system hangs. These occured in
2.1 and continue in 2.1.5. The symptoms are these: processes that
are running keep running. Processes cannot start. Processes appear
to be unable to exit. For example, if I'm running a shell I can
(always? I can't say for sure) run internal shell commands but as
soon as I try to run anything external, it hangs. I run a radius
server on that machine; it keeps responding to requests. There are
no console messages. There are no abnormal log entries. The disk
is still active.

The behavior of the system does change with time -- the radius
server stops responding eventually; when telnetting in, instead
of a connected-to message and a hang, it just doesn't connect.

The only remedy is the reset switch....

I've included the boot messages and the config. Any ideas?

	FreeBSD 2.1.5-RELEASE #0: Tue Aug 27 21:14:03 EDT 1996
	    root@ux1.cyberenet.net:/usr/src/sys/compile/UX1
	CPU: 133-MHz Pentium 735\90 or 815\100 (Pentium-class CPU)
	  Origin = "GenuineIntel"  Id = 0x52b  Stepping=11
	  Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
	real memory  = 67108864 (65536K bytes)
	avail memory = 63217664 (61736K bytes)
	Probing for devices on PCI bus 0:
	chip0 <Intel 82437 PCI cache memory controller> rev 2 on pci0:0
	chip1 <Intel 82371 PCI-ISA bridge> rev 2 on pci0:7:0
	chip2 <Intel 82371 Bus-master IDE controller> rev 2 on pci0:7:1
	de0 <Digital DC21041 Ethernet> rev 17 int a irq 5 on pci0:13
	de0: DC21041 [10Mb/s] pass 1.1 Ethernet address 00:00:c0:3b:ae:c7
	Probing for devices on the ISA bus:
	sc0 at 0x60-0x6f irq 1 on motherboard
	sc0: VGA color <16 virtual consoles, flags=0x0>
	sio0 not found at 0x3f8
	sio1 at 0x2f8-0x2ff irq 3 on isa
	sio1: type 16550A
	lpt0 not found at 0xffffffff
	fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
	fdc0: NEC 72065B
	fd0: 1.44MB 3.5in
	wdc0 not found at 0x1f0
	wdc1 not found at 0x170
	aha0 at 0x330-0x333 irq 11 drq 5 on isa
	aha0 waiting for scsi devices to settle
	(aha0:0:0): "FUJITSU M2694ES-512 8134" type 0 fixed SCSI 1
	sd0(aha0:0:0): Direct-Access 1033MB (2117025 512 byte sectors)
	(aha0:1:0): "QUANTUM XP34301 1071" type 0 fixed SCSI 2
	sd1(aha0:1:0): Direct-Access 4106MB (8410200 512 byte sectors)
	npx0 on motherboard
	npx0: INT 16 interface
	changing root device to sd0a
	WARNING: / was not properly dismounted.
	de0: enabling Thinwire/BNC port


machine         "i386"
cpu             "I486_CPU"
cpu             "I586_CPU"
ident           "UX1"
maxusers        64

options         INET                    #InterNETworking
options         FFS                     #Berkeley Fast Filesystem
options         "CD9660"                #ISO 9660 Filesystem
options         PROCFS                  #Process filesystem
options         "COMPAT_43"             #Compatible with BSD 4.3
options         "FAT_CURSOR"
options         "SCSI_DELAY=15"         #Be pessimistic about Joe SCSI device
options         BOUNCE_BUFFERS          #include support for DMA bounce buffers
options         DODUMP
options         DDB
options         "NMBCLUSTERS=4096"      # lots of mbufs!
options         "INITIAL_CBLOCKS=200"   # start with more clists

options         SYSVSHM
options         SYSVSEM
options         SYSVMSG

config          kernel  root on wd0

controller      isa0
controller      pci0

controller      fdc0    at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr
disk            fd0     at fdc0 drive 0
disk            fd1     at fdc0 drive 1

controller      wdc0    at isa? port "IO_WD1" bio irq 14 vector wdintr
disk            wd0     at wdc0 drive 0
disk            wd1     at wdc0 drive 1

controller      wdc1    at isa? port "IO_WD2" bio irq 15 vector wdintr
disk            wd2     at wdc1 drive 0
disk            wd3     at wdc1 drive 1

options         ATAPI   #Enable ATAPI support for IDE bus
device          wcd0    #IDE CD-ROM

controller      ahc0
controller      aha0    at isa? port "IO_AHA0" bio irq ? drq 5 vector ahaintr

controller      scbus0

device          sd0
device          st0
device          cd0     #Only need one of these, the code dynamically grows

# syscons is the default console driver, resembling an SCO console
device          sc0     at isa? port "IO_KBD" tty irq 1 vector scintr

device          npx0    at isa? port "IO_NPX" irq 13 vector npxintr

device          sio0    at isa? port "IO_COM1" tty irq 4 vector siointr
device          sio1    at isa? port "IO_COM2" tty irq 3 vector siointr

device          lpt0    at isa? port? tty irq 7 vector lptintr

device de0

pseudo-device   loop
pseudo-device   ether
pseudo-device   log
pseudo-device   pty     64
pseudo-device   gzip            # Exec gzipped a.out's



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