Date: Sat, 13 Apr 1996 21:07:34 -0400 (EDT) From: Brian Tao <taob@io.org> To: FREEBSD-HACKERS-L <freebsd-hackers@freebsd.org> Subject: pmap_zero_page and kmem_malloc panics Message-ID: <Pine.NEB.3.92.960413203938.27644F-100000@zap.io.org>
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For some reason, our Web/FTP server has been crashing/hanging a
lot lately. I was able to take down the reason for two recent ones:
panic: kmem_malloc: kmem_map too small
panic: pmap_zero_page: CMAP busy
The mysterious process deadlock hang also hit a couple of times
(can switch virtual consoles, can ping, but nothing else), with no
helpful errors logged.
I'm going to upgrade to the latest snapshot too see if this
problem goes away. The kernel has maxusers=128, SysV IPC options
turned on, NMBCLUSTERS=8192, OPEN_MAX=1024, CHILD_MAX=512 and
MAXMEM=131072. It isn't running out of mbufs (although it did hit
7202 out of 8192 once) and I doubt it is getting anywhere close to
hitting swap. 'top' usually shows about 50MB free when there isn't a
mirror process running.
The de0 interface sees between 100K to 200K per second both ways
on a 10Mbps link to our etherswitch, according to "netstat -b 1". The
Web server gets between 3.5 to 4 million hits per week, including
those to the 50 IP aliases on de0 (could this a problem?). The FTP
server isn't as busy, about 1200 files per day.
We've had two crashes already today. The second is the "CMAP
busy" one shown above, and it happened less than three hours after a
previous crash and reboot.
FreeBSD 2.1.0-RELEASE #0: Fri Apr 5 13:37:27 EST 1996
taob@cabal.io.org:/usr/local/src/sys/compile/WWW
CPU: 133-MHz Pentium 735\\90 or 815\\100 (Pentium-class CPU)
Origin = "GenuineIntel" Id = 0x52b Stepping=11
Features=0x1bf<FPU,VME,PSE,MCE,CX8,APIC>
real memory = 134217728 (131072K bytes)
avail memory = 130084864 (127036K bytes)
Probing for devices on the ISA bus:
vt0 at 0x60-0x6f irq 1 on motherboard
vt0: unknown trident, 80 col, color, 8 scr, mf2-kbd, [R3.20-b24]
sio0 at 0x3f8-0x3ff irq 4 on isa
sio0: type 16550A
sio1 at 0x2f8-0x2ff irq 3 on isa
sio1: type 16550A
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: NEC 72065B
fd0: 1.44MB 3.5in
npx0 on motherboard
npx0: INT 16 interface
Probing for devices on the PCI bus:
chip0 <Intel 82437 (Triton)> rev 2 on pci0:0
chip1 <Intel 82371 (Triton)> rev 2 on pci0:7
de0 <Digital DC21140 Fast Ethernet> rev 18 int a irq 12 on pci0:9
de0: DC21140 [10-100Mb/s] pass 1.2 Ethernet address 00:00:c0:39:41:c8
de0: enabling 10baseT UTP port
ncr0 <ncr 53c810 scsi> rev 2 int a irq 10 on pci0:11
ncr0 waiting for scsi devices to settle
(ncr0:0:0): "SEAGATE ST51080N 0913" type 0 fixed SCSI 2
sd0(ncr0:0:0): Direct-Access
sd0(ncr0:0:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
1030MB (2109840 512 byte sectors)
sd0(ncr0:0:0): with 4826 cyls, 4 heads, and an average 109 sectors/track
(ncr0:1:0): "QUANTUM XP34301 1051" type 0 fixed SCSI 2
sd1(ncr0:1:0): Direct-Access
sd1(ncr0:1:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
4106MB (8410200 512 byte sectors)
sd1(ncr0:1:0): with 4076 cyls, 20 heads, and an average 103 sectors/track
(ncr0:2:0): "QUANTUM XP34301 1051" type 0 fixed SCSI 2
sd2(ncr0:2:0): Direct-Access
sd2(ncr0:2:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
4106MB (8410200 512 byte sectors)
sd2(ncr0:2:0): with 4076 cyls, 20 heads, and an average 103 sectors/track
(ncr0:4:0): "QUANTUM XP34301 1071" type 0 fixed SCSI 2
sd3(ncr0:4:0): Direct-Access
sd3(ncr0:4:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
4106MB (8410200 512 byte sectors)
sd3(ncr0:4:0): with 4076 cyls, 20 heads, and an average 103 sectors/track
vga0 <VGA-compatible display device> rev 227 int a irq 11 on pci0:12
--
Brian Tao (BT300, taob@io.org)
Systems and Network Administrator, Internex Online Inc.
"Though this be madness, yet there is method in't"
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