Date: Thu, 18 Jul 2002 15:41:26 +0100 (BST) From: Gavin Atkinson <gavin@ury.york.ac.uk> To: <freebsd-ports@freebsd.org> Cc: <cy@freebsd.org> Subject: screen(1) issues with 4.6? Message-ID: <Pine.BSF.4.33.0207181023030.19954-100000@ury.york.ac.uk>
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Hi,
(This may be same as PR 39479, so cy@ cc'd as he is owner of that PR)
I'm seeing some strange problems with a couple of machine running
4.6-RELEASE and screen(1) installed as a package from ports. Installing
from source via ports works fine.
It seems that screen will use as much processor power as it can get hold
on. Worse still, this seems to be mostly system calls, thus making the
system pretty sluggish...
last pid: 61504; load averages: 1.00, 1.00, 1.00 up 0+11:50:05 10:25:19
26 processes: 4 running, 22 sleeping
CPU states: 19.0% user, 0.0% nice, 81.0% system, 0.0% interrupt, 0.0% idle
Mem: 15M Active, 8352K Inact, 15M Wired, 5216K Cache, 14M Buf, 15M Free
Swap: 600M Total, 80K Used, 600M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
147 gavin 54 0 1720K 1084K RUN 635:51 98.83% 98.83% screen
101 root 2 0 1800K 1100K select 0:04 0.00% 0.00% sendmail
61382 root 28 0 1716K 1204K RUN 0:03 0.00% 0.00% ppp
using ktrace reveals that the program is stuck in this tight loop:
147 screen CALL seteuid(0x3e8)
147 screen RET seteuid 0
147 screen CALL setegid(0x3e8)
147 screen RET setegid 0
147 screen CALL open(0x8089ca0,0x4,0)
147 screen NAMI "/tmp/screens/S-gavin/147.ttyp0.endor"
147 screen RET open 4
147 screen CALL seteuid(0)
147 screen RET seteuid 0
147 screen CALL setegid(0x3e8)
147 screen RET setegid 0
147 screen CALL select(0x400,0xbfbff440,0xbfbff3c0,0,0)
147 screen RET select 1
147 screen CALL fcntl(0x4,0x4,0)
147 screen RET fcntl 0
147 screen CALL read(0x4,0x8088480,0xc30)
147 screen GIO fd 4 read 0 bytes
""
147 screen RET read 0
147 screen CALL close(0x4)
147 screen RET close 0
So my suspition is that select() is returning when it shouldn't. As I say,
this only affects two machines, both are running 4.6-RELEASE. I am in the
process of upgrading one to -STABLE, so i'll reply to say if it fixed the
problem, though it does look as if it is the binary package at fault. I
can give shell access to somebody to the box I am about to upgrade to
-STABLE, if nobody else can recreate the problem. In the mean-time, is it
possible to delete the binary package from the FTP servers?
Gavin
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