Hi,
I have a reproducable bug with Kernel 2.6.24.[24] and apache2. Apache only
delivers files up to 256 bytes, transfer of larger files will be
interrupted (nothing was delivered). Others applications seems to work
correctly. A squid-2.6 on the same machine has no problems to access files
larger than 256 bytes, copying, transferring via network or editing works
correctly too.
I've tested randomly some aufs versions since 20071001, all shows the same
effect. On the other side, in my older kernel 2.6.20.21 with aufs from
20071015 works correctly.
The curious thing: the time I've seen this bug was two years ago with
unionfs - and this bug was the reason to switch to aufs ;-)
Some debug infos including a strace from apache process below.
Wolfgang
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1) cat /proc/mounts:
rootfs / rootfs rw 0 0
/dev/sr0 / iso9660 ro 0 0
none /proc proc rw 0 0
tmpfs /MEMORY tmpfs rw 0 0
none /etc aufs rw,xino=/MEMORY/etc/.aufs.xino,br:/MEMORY/etc=rw:/z-etc=rr 0 0
none /dev aufs rw,xino=/MEMORY/dev/.aufs.xino,br:/MEMORY/dev=rw:/dev=rr 0 0
/dev/sda2 /DISK/var ext3 rw,data=ordered 0 0
none /var aufs rw,xino=/DISK/var/.aufs.xino,br:/DISK/var=rw:/z-var=rr 0 0
tmpfs /lib/init/rw tmpfs rw,nosuid 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec 0 0
usbfs /proc/bus/usb usbfs rw,nosuid,nodev,noexec 0 0
tmpfs /dev/shm tmpfs rw,nosuid,nodev 0 0
devpts /dev/pts devpts rw,nosuid,noexec 0 0
/dev/sda5 /var/tmp/havp ext3 rw,mand,data=ordered 0 0
2) ls -l /sys/fs/aufs/*
-rw-r--r-- 1 root root 0 Apr 4 17:37 /sys/fs/aufs/brs
-rw-r--r-- 1 root root 0 Apr 4 17:37 /sys/fs/aufs/config
-rw-r--r-- 1 root root 0 Apr 4 17:37 /sys/fs/aufs/debug
-rw-r--r-- 1 root root 0 Apr 4 17:37 /sys/fs/aufs/stat
/sys/fs/aufs/f6cca000:
total 0
-rw-r--r-- 1 root root 0 Apr 4 17:37 xino
/sys/fs/aufs/f75c0a00:
total 0
-rw-r--r-- 1 root root 0 Apr 4 17:37 xino
/sys/fs/aufs/f7c99e00:
total 0
-rw-r--r-- 1 root root 0 Apr 4 17:37 xino
3) cat /proc/version
Linux version 2.6.24.4 ([EMAIL PROTECTED]) (gcc version 4.1.2 20061115
(prerelease) (Debian 4.1.1-21)) #3 SMP Sun Mar 30 11:00:50 CEST 2008
4) strings --all /lib/modules/2.6.24.4/kernel/fs/aufs/aufs.ko |grep version
version=20080324
5) make KDIR=/usr/src/linux -f local.mk (plain local.mk)
6) strace apache process:
Process 2101 attached - interrupt to quit
accept(3, {sa_family=AF_INET, sin_port=htons(52723),
sin_addr=inet_addr("172.17.49.1")}, [16]) = 8
getsockname(8, {sa_family=AF_INET, sin_port=htons(80),
sin_addr=inet_addr("172.17.49.12")}, [16]) = 0
fcntl64(8, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(8, F_SETFL, O_RDWR|O_NONBLOCK) = 0
read(8, "GET /squid/download.html\r\n", 8000) = 26
gettimeofday({1207336449, 210394}, NULL) = 0
stat64("/var/www/squid/download.html", {st_mode=S_IFREG|0644, st_size=458,
...}) = 0
open("/var/www/squid/download.html", O_RDONLY|O_LARGEFILE) = 9
sendfile(8, 9, [0], 458) = -1 EINVAL (Invalid argument)
read(8, 0x81c8150, 8000) = -1 EAGAIN (Resource temporarily
unavailable)
write(7, "172.17.49.1 - - [04/Apr/2008:21:"..., 88) = 88
close(8) = 0
read(4, 0xbff11297, 1) = -1 EAGAIN (Resource temporarily
unavailable)
close(9) = 0
close(5) = 0
close(4) = 0
exit_group(0) = ?
Process 2101 detached
=====================================
--
<wob (at) swobspace de> * http://www.swobspace.de
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