Messages in this thread | | | Date | Sat, 03 Mar 2001 09:06:30 -0600 | From | Steven Brooks <> | Subject | PROBLEM: block loop device hangs |
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When mounting a file using the loopback device, the mount program hangs for ever. Other than that, the system is still usable.
Dist: Redhat-7 Kernel: 2.4.2 (compiled with kgcc, i.e. egcs-2.91.66) CPU: Pentium II 400 Mem: 128MB RAM + 512MB swap (More information below)
For me, it is 100% reproducable, no matter what I try to mount: 1. an ISO image from a Win2000 FAT32 partition, from hdb (IDE/ATAPI drive) 2. an ext2 image from an ext2 partition, from hdb (IDE/ATAPI drive) 3. an ext2 image from a Win2000 FAT32 partition, from hda (a different IDE/ATAPI drive)
The simplest way for me to reproduce it is: dd if=/dev/zero of=t bs=1024k count=1 mke2fs t mount -o loop t /mnt/cdrom
Mount then hangs, and never recovers. I cannot even kill it using kill -9.
An strace of mount shows (they all die in the exact same place): [...] open("t", O_RDWR) = 3 open("/dev/loop0", O_RDWR) = 4 mlockall(0x3, 0xbffff848) = 0 ioctl(4, LOOP_SET_FD, 0x3) = 0 ioctl(4, LOOP_SET_STATUS, 0xbffff828) = 0 close(4) = 0 close(3) = 0 rt_sigprocmask(SIG_BLOCK, ~[TRAP SEGV], NULL, 8) = 0 stat64("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0 open("/dev/loop0", O_RDONLY) = 3 lseek(3, 1024, SEEK_SET) = 1024 read(3,
(The last line is left unfinished by strace.)
ps auwx shows: [...] root 818 0.0 1.2 1564 1548 pts/0 DL 08:44 0:00 mount -o loop t /mnt/cdrom [...]
I have lots of memory available; free shows: total used free shared buffers cached Mem: 127156 124884 2272 0 19140 49148 -/+ buffers/cache: 56596 70560 Swap: 530104 60 530044
Other than that, the system is still fine. I can umount and mount other, real block devices (attempting to mount another loopback just causes another process to hang).
I can't keep up with the kernel traffic. If you need any more information, please e-mail me directly.
Thanks, Steven
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/proc/version: Linux version 2.4.2 (root@minneyar) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #5 Fri Mar 2 08:09:35 CST 2001
/proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 5 model name : Pentium II (Deschutes) stepping : 3 cpu MHz : 399.327 cache size : 512 KB fdiv_bug : no hlt_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 fxsr bogomips : 796.26
/proc/modules: loop 7584 2 (autoclean) tdfx 53104 1 nfsd 70992 8 (autoclean) lockd 49744 1 (autoclean) [nfsd] sunrpc 59136 1 (autoclean) [nfsd lockd] 8139too 15104 1 (autoclean) agpgart 13952 1 nls_iso8859-1 2832 2 (autoclean) nls_cp437 4352 2 (autoclean) vfat 11504 2 (autoclean) fat 31744 0 (autoclean) [vfat] es1371 26832 0 soundcore 3856 4 [es1371] ac97_codec 7920 0 [es1371] usb-uhci 22544 0 (unused) usbcore 47408 1 [usb-uhci]
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