I'm trying out this patch:
https://build.opensuse.org/package/view_file?file=postfix-mysql-write-suppo…
and I keep getting a segfault in proxymap. I've read the postfix
DEBUG_README a number of times and tried various debugger_command
without getting any closer. I thought the next thing would be getting
a core dump, but that's not easy either ...
Apparently, there is an issue in getting a core dump from a process that
has dropped privileges? I've changed kernel.core_uses_pid and
kernel.core_pattern, and I've even tried
updating /etc/security/limits.conf, but still no core dump.
Any suggestions?
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Per Jessen, Zürich (21.9°C)
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I am experiencing a frustrating problem with a USB device. The device
has linux support and uses libusb in asynchronous mode via
libusb_fill_interrupt_transfer(). The device is a multi-button device
(http://xkeys.com/xkeys/xk24.php). The problem is that, after a random
amount of time, the callback registered with
libusb_fill_interrupt_transfer() is called with the status
LIBUSB_TRANSFER_CANCELLED. There is no need for there to be any user
interaction with the device when this happens. It just appears. After
this happens, libusb no longer provides any events.
In a search, I see some info about this when packets larger than 16k are
involved. In the case of this device, the packets are more on the order
of 80 bytes. The solution was a newer kernel and libusb. But that was
only for devices sending >16k packets.
Unfortunately this is on openSUSE 11.2. I cannot update these systems at
this time. So I need to see what is happening to see if there is
anything I can do.
Has anyone come across this kind of behavior on openSUSE? I am using
libusb 1.0.2, which seems to be the one that goes with kernel 2.6.31.
I have of course asked the supplier. But I get a feeling that may not
lead anywhere. The officially support Ubuntu. Support requests seem to
disappear.
Yours sincerely,
Roger Oberholtzer
OPQ Systems / Ramböll RST
Office: Int +46 10-615 60 20
Mobile: Int +46 70-815 1696
roger.oberholtzer(a)ramboll.se
________________________________________
Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden
www.rambollrst.se
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I have a threaded application that encounters a segmentation violation.
I am fairly certain it is the initial thread that encounters the
problem. But I just want to be sure of the following:
1. If a multi-threaded app encounters a seg violation, and a core dump
is created, the core is of the thread that encountered the seg
violation, and not of the main thread, right?
2. If a process starts a thread, and that thread exits, the process does
not know about this until it tries to join the thread, right? So, if a
thread has a seg violation and exits, the 'parent' thread will also not
be made exit. It has to detect the thread is gone by it's own mechanisms
or by trying to join the thread. I ask this because I want to be certain
I am not misinterpreting which thread in my application is the one that
really is getting the seg violation.
This is on openSUSE 11.2 with kernel 2.6.31.14-51-desktop
Yours sincerely,
Roger Oberholtzer
OPQ Systems / Ramböll RST
Office: Int +46 10-615 60 20
Mobile: Int +46 70-815 1696
roger.oberholtzer(a)ramboll.se
________________________________________
Ramböll Sverige AB
Krukmakargatan 21
P.O. Box 17009
SE-104 62 Stockholm, Sweden
www.rambollrst.se
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