Messages in this thread | | | Date | Thu, 10 Jun 1999 11:16:50 +0800 | From | Tung-Han Hsieh <> | Subject | Problem of swap file |
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Dear All,
I want to report a problem which is related to multiple swap files. I report this problem according to the "REPORTING-BUGS" format.
[1.] swapon/off will fault in multiple swap files.
[2.] I have tried to enable multiple swap files with swapon / off but found something strange. My procedure is
1. Create swap files:
dd if=/dev/null of=/home/swap/swap1 bs=1024 count=524288 dd if=/dev/null of=/home/swap/swap2 bs=1024 count=524288 mkswap /home/swap/swap1 mkswap /home/swap/swap2
2. Then I tried to swapon them. This step seems OK.
swapon /home/swap/swap1 swapon /home/swap/swap2
3. Then I tried to swapoff them. It seems OK, too.
swapoff /home/swap/swap1 swapoff /home/swap/swap2
4. However, when I tried to swapon swap1 again, it cause segmentation fault:
swapon /home/swap/swap1 ==> Segmentation fault cat /proc/swaps ==> Segmentation fault swapoff /home/swap/swap1 ==> swapoff: /home/swap/swap1: Invalid argument
If I type "free" command, I see that the swap size does not include these two swap files.
5. The only way I can think to recover this is to reboot system. Then I got a "Device or resource busy" message when I try to unmount the partition /home.
6. However, if I try to swapoff/on only 1 swap file, it seems OK to do that:
swapon /home/swap/swap1 swapon /home/swap/swap2 swapoff /home/swap/swap2 swapon /home/swap/swap2 swapoff /home/swap/swap2 .......
[3.] Keywords: swap, swapon, swapoff
[4.] Kernel version: Linux version 2.2.9 (root@twcp3) (gcc version 2.7.2.3) #3 \ Mon Jun 7 15:04:44 CST 1999
[5.] No Oops output here.
[6.] The procedure to trigger the problem is described as above.
[7.] Environment: [7.1.] Output of ver_linux script:
========================================================================== -- Versions installed: (if some fields are empty or looks -- unusual then possibly you have very old versions) Linux twcp3 2.2.9 #3 Mon Jun 7 15:04:44 CST 1999 i686 unknown Kernel modules 2.1.121 Gnu C 2.7.2.3 Binutils 2.9.1.0.19 Linux C Library 2.1.1 Dynamic linker ldd (GNU libc) 2.1.1 Procps 1.2.9 Mount 2.9g Net-tools 2.01 Kbd 0.96 Sh-utils 1.16 Modules Loaded serial via-rhine vfat nfs lockd sunrpc binfmt_aout ==========================================================================
[7.2.] Processor information
========================================================================== processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 7 model name : 00/07 stepping : 3 cpu MHz : 551.261100 cache size : 512 KB fdiv_bug : no hlt_bug : no sep_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx osfxsr kni bogomips : 550.50 ==========================================================================
[7.3.] Module information:
========================================================================== serial 18112 0 (autoclean) via-rhine 8360 1 vfat 11088 0 (unused) nfs 27932 0 (unused) lockd 28932 0 [nfs] sunrpc 48052 0 [nfs lockd] binfmt_aout 3704 0 ==========================================================================
[7.4.] SCSI information
========================================================================== Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: QUANTUM Model: ATLAS IV 9 WLS Rev: 0707 Type: Direct-Access ANSI SCSI revision: 02 ==========================================================================
[7.5.] Other information
I use Debian Linux-2.1, but I upgrade the kernel source (the original source without the Debian patches) to 2.2.9, and the glibc-2.1 (Debian package libc6-2.1.1-10). Debian Linux-2.1 is ready for kernel-2.2 environment.
The /etc/fstab is:
========================================================================== # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> /dev/sda2 / ext2 defaults,errors=remount-ro 0 1 /dev/sda6 none swap sw 0 0 proc /proc proc defaults 0 0 /dev/sda3 /var ext2 defaults 0 2 /dev/sda5 /home ext2 defaults 0 2 ==========================================================================
command "fdisk -l /dev/sda" shows
========================================================================== Disk /dev/sda: 255 heads, 63 sectors, 1116 cylinders Units = cylinders of 16065 * 512 bytes
Device Boot Start End Blocks Id System /dev/sda1 * 1 262 2104483+ b Win95 FAT32 /dev/sda2 263 351 714892+ 83 Linux native /dev/sda3 352 389 305235 83 Linux native /dev/sda4 390 1116 5839627+ 5 Extended /dev/sda5 390 1052 5325516 83 Linux native /dev/sda6 1053 1116 514048+ 82 Linux swap ==========================================================================
Tung-Han Hsieh
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