strace makes kernel noisy

Jonathan Sergent (sergent+kernel@kgb.etla.net)
Sat, 09 Jan 1999 20:38:05 -0800


strace works funny for me on 2.2.0-pre6. (Not sure when it started
doing this; probably sometime back in 2.1.x, since I don't use it
very often.)

I get these kernel messages:

Jan 9 19:09:40 kgb kernel: Process: ftp (stack=c663fe5c, task=c663e000)
Jan 9 19:09:40 kgb kernel: [<c016698b>] [<c0166d56>] [<c0117645>] [<c016d707>] [<c0174a0b>] [<c017497c>] [<c0156f2e>] [<c017497c>] [<c0157145>] [<c01570ac>] [<c0123b38>] [<c0109634>]
Jan 9 19:09:40 kgb kernel: Process: ftp (stack=c663fef0, task=c663e000)
Jan 9 19:09:40 kgb kernel: [<c010938f>] [<c0157145>] [<c01570ac>] [<c0123b38>] [<c0123b50>] [<c010967c>]
Jan 9 19:09:40 kgb kernel: Process: ftp (stack=c663ff8c, task=c663e000)
Jan 9 19:09:40 kgb kernel: [<c010c789>] [<c010969d>]

... these last two lines continue for a long time (evidently until I
hit ^C on the strace). I don't see an actual error message here,
but I guess this is a stack dump of some sort.

I don't know how this stuff works under the covers, but I shouldn't be
able to make the kernel go crazy like this. If this is not a known
problem then I'll try to look into why my machine doing this... or is
this just a case of debug messages that were never turned off?

strace(1)'s output (when redirected to a file so it's not cluttered with
the kernel messages) seems okay.

-- 
Jonathan Sergent / sergent@io.com

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