I posted my question in the lighttpd development forum here:
http://redmine.lighttpd.net/boards/3/topics/3623
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Bus error
https://bugs.launchpad.net/bugs/643518
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ubuntu-bugs mailing
Yes I will ask lighttpd development team if its normal or not.
From my gut feeling a server software should never crash with Bus error.
What is interessting, I didn't notice to have this problem with OpenSolaris and
ZFS. Maybe nmap has a different behaviour on Linux than Solaris.
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Bus error
Since I no more changed the file stats, lighttpd no more crashes with bus
error.
So: Do not change files while lighttpd is reading them with nmap under Linux.
Solution: Change document root files only with UNIX rename syscall.
This bug will not happen if files will be changed properly.
You can
lighttpd version:
lighttpd/1.4.26 (ssl)
I could use strace to trace when it bus error occured:
ioctl(14, FIONREAD, [0])= 0
read(14, 0x298dd70, 4159) = -1 EAGAIN (Resource temporarily
unavailable)
epoll_ctl(12, EPOLL_CTL_MOD, 14, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=14,
Its possible that the content of /var/www/trashmail/htdocs/stats changed
between the mmap and write from outside on the filesystem.
Then the data addresses provided by mmap could be invalid.
Should lighttpd not lock the file after open and before executing mmap?
Then unlock after reading it?
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locking would probably uses too much resources for a high-speed webserver.
The error comes from my side: I change a file while lighttpd is using it. The
solution would be to change it atomically without that lighttpd loss its file
descriptor. I will use rename for this.
So if I change the
Public bug reported:
Binary package hint: lighttpd
Lighttpd crashes with a Bus error every hour on my server.
# lighttpd -f /etc/lighttpd/lighttpd.conf -D
Bus error
Can't use GDB to find out more because I get generic error:
# gdb /usr/sbin/lighttpd
GNU gdb (GDB) 7.1-ubuntu
Copyright (C) 2010
Here are my system information:
# cat /etc/issue
Ubuntu 10.04.1 LTS \n \l
# uname -ar
Linux trashmail 2.6.32-23-server #37-Ubuntu SMP Fri Jun 11 09:11:11 UTC 2010
x86_64 GNU/Linux
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Bus error
https://bugs.launchpad.net/bugs/643518
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Public bug reported:
Impossible to use DBI with DBD::mysql on Ubuntu 10.04.1 LTS.
I get Segmentation fault of Perl when exiting the script.
It seems that there is an internal destructor for DBD which is called on
script exit which produce this segfault error.
I can repeat the error at any time.
