Date: Fri, 2 Oct 1998 01:02:46 -0400 (EDT) From: Brian Tao <taob@risc.org> To: FREEBSD-CURRENT <freebsd-current@FreeBSD.ORG> Subject: Processes stuck waiting for tty drain? Message-ID: <Pine.GSO.3.96.981002005131.23916A-100000@tor-dev1.nbc.netcom.ca>
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Installed a 3.0-BETA on a K6-2/300, supped at around 22:00 EDT on
September 30. No devfs, ELF system. I used "pax -rwvpe" to duplicate
/usr/{obj,src,sup} from /dev/wd0s2h to /dev/da0s1a (both with
softupdates enabled). At some point during the copy, activity on that
tty stopped. I telnetted back into the machine and found the pax
process in SIGSTOP. Sending it a SIGCONT changed its state, but it
didn't seem to be making any further progress:
% ps lax
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
1000 338 337 0 18 0 452 264 pause Is p1 0:00.04 -csh (csh)
0 353 338 0 4 0 1312 1108 ttywai S+ p1 0:00.15 -usr/local/bin/tcsh
0 407 353 0 4 0 1112 980 ttywri S p1 0:09.00 pax -rwvpe obj ports src sup /depot
Killing off pax and tcsh left just the login csh, which was
unkillable:
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
1000 338 337 0 4 0 452 288 ttywai SEs+ p1- 0:00.00 (csh)
Killing off the parent telnetd did allow the csh to exit. Last
time I saw this sort of thing (probably three or more years ago now),
the process was somehow blocked while waiting for its tty to drain
before exiting. This time, I was ssh'd into a Solaris box from home
over 64K ISDN, then telnetting into the -current box, if that makes a
difference. Any ideas? I'll try reproducing the problem.
[...]
wdc0 at 0x1f0-0x1f7 irq 14 on isa
wdc0: unit 0 (wd0): <ST39140A>
wd0: 8693MB (17803440 sectors), 17662 cyls, 16 heads, 63 S/T, 512 B/S
wd0: ATA INQUIRE valid = 0007, dmamword = 0007, apio = 0003, udma = 0407
[...]
ncr0: restart (scsi reset).
de0: enabling 100baseTX port
(probe6:ncr0:0:6:0): INQUIRY. CDB: 12 1 80 0 ff 0
(probe6:ncr0:0:6:0): ILLEGAL REQUEST asc:24,0
(probe6:ncr0:0:6:0): Invalid field in CDB sks:c8,1
pass0 at ncr0 bus 0 target 3 lun 0
pass0: <SEAGATE ST34573N 5958> Fixed Direct Access SCSI2 device
pass0: Serial Number LN496865000019070BR8
pass0: 20.0MB/s transfers (20.0MHz, offset 15), Tagged Queueing Enabled
pass1 at ncr0 bus 0 target 6 lun 0
pass1: <TOSHIBA CD-ROM XM-6201TA 1030> Removable CD-ROM SCSI2 device
pass1: 10.0MB/s transfers (10.0MHz, offset 16)
da0 at ncr0 bus 0 target 3 lun 0
da0: <SEAGATE ST34573N 5958> Fixed Direct Access SCSI2 device
da0: Serial Number LN496865000019070BR8
da0: 20.0MB/s transfers (20.0MHz, offset 15), Tagged Queueing Enabled
da0: 4340MB (8888924 512 byte sectors: 255H 63S/T 553C)
--
Brian Tao (BT300, taob@risc.org)
"Though this be madness, yet there is method in't"
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