sysutils/strace wilderness on 6-CURRENT

From: Vladimir Grebenschikov (vova_at_fbsd.ru)
Date: 08/31/04

  • Next message: Maxim Sobolev: "Re: burncd(8) usability: why `-s max' isn't default?" 
    To: "current@freebsd.org" <current@freebsd.org>
Date: Tue, 31 Aug 2004 14:28:00 +0400

    Hi

    (fresh -CURREMT and fresh strace from ports, UP machine)

    It silmple does nothing - sleeps foreaver in suspended:

    # strace /bin/ls
    ^T
    load: 0.14 cmd: strace 98957 [suspended] 0.00u 0.00s 0% 760k
    ^C
    #

    child program does not executed too.

    But if do sometimes (often) if I do
    # truss strace /bin/ls
    (it works as expected)

    and then
    # strace /bin/ls
    execve(0xbfbfe0e0, [0xbfbfe5c4], [/* 0 vars */]) = 0
    mmap(0, 3880, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x28071000
    munmap(0x28071000, 3880) = 0
    __sysctl([...], 0x2806da4c, 0xbfbfe378, NULL, 0) = 0
    mmap(0, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) =
    0x28071000
    issetugid(0) = 0
    open("/etc/libmap.conf", O_RDONLY) = 3
    ...

    strace start work as expected, but only one time, second time it stick
    again.

    view from KDB:
    [thread 100016]
    Stopped at kdb_enter+0x30: leave
    db> ps
      pid proc uarea uid ppid pgrp flag stat wmesg wchan
    cmd
    99035 c32448c0 d6a85000 207 99034 99034 0020002 stop[SUSP] strace
    99034 c21f8a80 d7911000 207 98930 99034 0004002 [SLPQ pioctl
    0xc32449e8][SLP] strace 

    -- 
Vladimir B. Grebenchikov
vova@fbsd.ru
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  • Next message: Maxim Sobolev: "Re: burncd(8) usability: why `-s max' isn't default?"