Package: strace
Version: 4.5.14-1
Severity: normal
If you attach to a running multithreaded program using -f -p <pid>,
everything seems to work fine (you get the trace of all running threads)
until the time comes to detach. Pressing ^C leaves strace hanging; pressing
^Z followed by "kill %1" kills strace, but also kills the traced program.
This makes strace useless for tracing running multithreaded programs.
To repeat:
$ pgrep firefox
3422
$ strace -fp 3422
... a bunch of output ...
[pid 3422] gettimeofday({1152268503, 354598}, NULL) = 0
[pid 3422] poll(^CProcess 3422 detached
At this point, strace is hanging. When I press ^Z and kill strace, Firefox
dies as well. The same happens with other multithreaded programs, not just
Firefox. The problem does not occur without -f and therefore is not an
issue for single-threaded programs.
This is under Debian's 2.6.15-1-686 kernel, but the same seems to happen
under other kernels from the 2.6 series.
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (900, 'testing'), (800, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.15-1-686
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages strace depends on:
ii libc6 2.3.6-15 GNU C Library: Shared libraries
strace recommends no packages.
-- no debconf information
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