Hi Arnd,
> Are you sure that it's not just taking very long?
Hmm, after one or two minutes I lost my patience. Also, hitting Ctrl-C
didn't abort the application. Suspending it with Ctrl-Z doesn't work
either. I did an strace, and the last few lines look like this:
stat64("/dev/mmcblk0p1", {st_mode=S_IFBLK|0660, st_rdev=makedev(179,
5), ...}) = 0
open("/dev/mmcblk0p1", O_RDONLY|O_EXCL) = 3
close(3) = 0
open("/dev/mmcblk0p1", O_RDONLY|O_LARGEFILE) = 3
uname({sys="Linux", node="mde", ...}) = 0
ioctl(3, BLKGETSIZE64, 0xbea40610) = 0
close(3) = 0
write(1, "fs_types for mke2fs.conf resolut"..., 37fs_types for
mke2fs.conf resolution: ) = 37
write(1, "'ext3'", 6'ext3') = 6
write(1, "\n", 1
) = 1
open("/dev/mmcblk0p1", O_RDONLY|O_LARGEFILE) = 3
ioctl(3, BLKSSZGET, 0xbea408b8) = 0
close(3) = 0
open("/dev/mmcblk0p1", O_RDONLY|O_LARGEFILE) = 3
ioctl(3, BLKPBSZGET, 0xbea408bc) = 0
close(3) = 0
stat64("/dev/mmcblk0p1", {st_mode=S_IFBLK|0660, st_rdev=makedev(179,
5), ...}) = 0
open("/dev/mmcblk0p1", O_RDONLY|O_LARGEFILE) = 3
fadvise64_64(3, 0, 0, POSIX_FADV_RANDOM) = 0
fstat64(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(179, 5), ...}) = 0
uname({sys="Linux", node="mde", ...}) = 0
ioctl(3, BLKGETSIZE64, 0x53a4b8) = 0
ioctl(3, CDROM_GET_CAPABILITY, 0) = -1 EINVAL (Invalid argument)
ioctl(3, BLKALIGNOFF, 0xbea40764) = 0
ioctl(3, BLKIOMIN, 0xbea40764) = 0
ioctl(3, BLKIOOPT, 0xbea40764) = 0
ioctl(3, BLKPBSZGET, 0xbea40764) = 0
ioctl(3, BLKSSZGET, 0x53a4d0) = 0
close(3) = 0
access("/sys/fs/ext4/features/lazy_itable_init", R_OK) = -1 ENOENT (No
such file or directory)
open("/dev/mmcblk0p1", O_RDWR|O_EXCL|O_LARGEFILE) = 3
stat64("/dev/mmcblk0p1", {st_mode=S_IFBLK|0660, st_rdev=makedev(179,
5), ...}) = 0
ioctl(3, BLKDISCARDZEROES, 0xbea40880) = 0
ioctl(3, BLKROGET, 0xbea40884) = 0
uname({sys="Linux", node="mde", ...}) = 0
gettimeofday({1403353145, 564428}, NULL) = 0
gettimeofday({1403353145, 564587}, NULL) = 0
gettimeofday({1403353145, 564709}, NULL) = 0
ioctl(3, BLKDISCARD
Too bad I cannot see the arguments/results from the ioctls ...
I also noticed that it takes an awful lot of kernel task time:
root@mde:~# top | head -n9
top - 14:09:59 up 2 min, 2 users, load average: 1.84, 0.79, 0.30
Tasks: 86 total, 2 running, 84 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.3 us, 22.2 sy, 0.0 ni, 54.6 id, 22.5 wa, 0.0 hi, 0.4 si, 0.0 st
KiB Mem: 1034092 total, 86760 used, 947332 free, 2808 buffers
KiB Swap: 0 total, 0 used, 0 free, 52128 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
71 root 20 0 0 0 0 R 99.5 0.0 2:23.54 mmcqd/1
323 root 20 0 2640 1640 1304 R 5.5 0.2 0:00.02 top
Maybe it's hanging in the kernel ? The whan stays at get_request:
root@mde:~# ps -a -o pid,f,stat,pcpu,pmem,psr,comm,wchan=WIDE-WCHAN | grep mkfs
296 0 D+ 0.0 0.1 2 mkfs.ext3 get_request
> Can you try erasing a smaller region of the device
Sure, this seems to work.
root@mde:~# blkdiscard /dev/mmcblk0 0 1
erasing 0 to 1 on /dev/mmcblk0
ioctl: Invalid argument
root@mde:~# blkdiscard /dev/mmcblk0 0 512
erasing 0 to 512 on /dev/mmcblk0
root@mde:~# blkdiscard /dev/mmcblk0 0 4096
erasing 0 to 4096 on /dev/mmcblk0
root@mde:~# blkdiscard /dev/mmcblk0 0 8192
erasing 0 to 8192 on /dev/mmcblk0
root@mde:~# blkdiscard /dev/mmcblk0 0 16384
erasing 0 to 16386 on /dev/mmcblk0
ioctl: Invalid argument
root@mde:~# xxd -g0 </dev/mmcblk0 | head
0000000: 00000000000000000000000000000000 ................
0000010: 00000000000000000000000000000000 ................
0000020: 00000000000000000000000000000000 ................
0000030: 00000000000000000000000000000000 ................
0000040: 00000000000000000000000000000000 ................
0000050: 00000000000000000000000000000000 ................
0000060: 00000000000000000000000000000000 ................
0000070: 00000000000000000000000000000000 ................
0000080: 00000000000000000000000000000000 ................
0000090: 00000000000000000000000000000000 ................
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