[Bug 643518] Re: Bus error
** Changed in: lighttpd (Ubuntu) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/643518 Title: Bus error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lighttpd/+bug/643518/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
FYI: fixed in lighttpd 1.4.40, released July 2016. Latest lighttpd release (at time this is being written) is lighttpd 1.4.44 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/643518 Title: Bus error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lighttpd/+bug/643518/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
I posted my question in the lighttpd development forum here: http://redmine.lighttpd.net/boards/3/topics/3623 -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
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. -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
Thank you for your bug report and investigating the root cause / issue. I do not really agree that it is not a bug; a web server should not crash in this case, but handle it more gracefully. Therefore I am marking it Triaged for now. Do you like to report it to the Lighttpd developers upstream? If they believe it is invalid, I would agree - but they are probably interested to know about this. ** Changed in: lighttpd (Ubuntu) Importance: Undecided => Low ** Changed in: lighttpd (Ubuntu) Status: New => Triaged -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: 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 close the bug. -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
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 contents of file "stats", I will create "stats.tmp" and then rename it to "stats". I will try this out to see if I will still get a bus error. -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
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? -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
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, u64=14}})
= 0
epoll_ctl(12, EPOLL_CTL_MOD, 14, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=14, u64=14}})
= 0
epoll_wait(12, {{EPOLLIN, {u32=13, u64=13}}}, 10001, 1000) = 1
ioctl(13, FIONREAD, [613]) = 0
read(13, "GET /stats HTTP/1.1\r\nHost: www.t"..., 4159) = 613
setsockopt(13, SOL_TCP, TCP_CORK, [1], 4) = 0
writev(13, [{"HTTP/1.1 200 OK\r\nContent-Type: a"..., 163}], 1) = 163
open("/var/www/trashmail/htdocs/stats", O_RDONLY) = 24
fcntl(24, F_SETFD, FD_CLOEXEC) = 0
mmap(NULL, 26, PROT_READ, MAP_SHARED, 24, 0) = 0x7ff6a72bc000
write(13, "221744625:0.00:1222:36391\n", 26) = -1 EFAULT (Bad address)
--- SIGBUS (Bus error) @ 0 (0) ---
Process 332 detached
--
Bus error
https://bugs.launchpad.net/bugs/643518
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 643518] Re: Bus error
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 -- Bus error https://bugs.launchpad.net/bugs/643518 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
