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wierd: resize2fs hangs when enlarging loop dev on-line

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fpemud
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Guru

Joined: 15 Feb 2012
Posts: 354

Posted: Mon Dec 26, 2016 11:52 pm Post subject: wierd: resize2fs hangs when enlarging loop dev on-line

First, I run ./a.sh:

Code:

fpemud-workstation test # cat a.sh
dd if=/dev/zero of=abc.img bs=409600 count=1024 conv=sparse
mkfs.ext4 -O ^has_journal abc.img
mkdir mntdir
mount abc.img mntdir

Then, I run ./b.sh step by step manually:

Code:

fpemud-workstation test # cat b.sh
dd if=/dev/zero bs=102400 count=1024 >> abc.img
losetup -c /dev/loop0
resize2fs -p -f /dev/loop0

System hang on this command, it seems it hangs in ioctl.
top shows resize2fs use 100% of one cpu core, in system mode:

Code:

fpemud-workstation test # strace resize2fs /dev/loop0
execve("/sbin/resize2fs", ["resize2fs", "/dev/loop0"], [/* 64 vars */]) = 0
brk(NULL) = 0x1b57000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa128fc4000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=235155, ...}) = 0
mmap(NULL, 235155, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa128f8a000
close(3) = 0
open("/lib64/libe2p.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=32608, ...}) = 0
mmap(NULL, 2128584, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa128b9a000
mprotect(0x7fa128ba1000, 2093056, PROT_NONE) = 0
mmap(0x7fa128da0000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7fa128da0000
close(3) = 0
open("/lib64/libext2fs.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\3\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=334824, ...}) = 0
mmap(NULL, 2430824, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa128948000
mprotect(0x7fa128997000, 2097152, PROT_NONE) = 0
mmap(0x7fa128b97000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4f000) = 0x7fa128b97000
close(3) = 0
open("/lib64/libcom_err.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\25\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=14456, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa128f89000
mmap(NULL, 2109960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa128744000
mprotect(0x7fa128747000, 2093056, PROT_NONE) = 0
mmap(0x7fa128946000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fa128946000
close(3) = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\7\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1664424, ...}) = 0
mmap(NULL, 3770584, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa1283ab000
mprotect(0x7fa12853b000, 2093056, PROT_NONE) = 0
mmap(0x7fa12873a000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18f000) = 0x7fa12873a000
mmap(0x7fa128740000, 14552, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa128740000
close(3) = 0
open("/lib64/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220`\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=131032, ...}) = 0
mmap(NULL, 2208808, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fa12818f000
mprotect(0x7fa1281a6000, 2093056, PROT_NONE) = 0
mmap(0x7fa1283a5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7fa1283a5000
mmap(0x7fa1283a7000, 13352, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fa1283a7000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa128f88000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa128f86000
arch_prctl(ARCH_SET_FS, 0x7fa128f86740) = 0
mprotect(0x7fa12873a000, 16384, PROT_READ) = 0
mprotect(0x7fa1283a5000, 4096, PROT_READ) = 0
mprotect(0x7fa128946000, 4096, PROT_READ) = 0
mprotect(0x7fa128b97000, 4096, PROT_READ) = 0
mprotect(0x7fa128da0000, 4096, PROT_READ) = 0
mprotect(0x60c000, 4096, PROT_READ) = 0
mprotect(0x7fa128fc5000, 4096, PROT_READ) = 0
munmap(0x7fa128f8a000, 235155) = 0
set_tid_address(0x7fa128f86a10) = 10725
set_robust_list(0x7fa128f86a20, 24) = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7fa128194b30, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7fa12819fec0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7fa128194bc0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fa12819fec0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
brk(NULL) = 0x1b57000
brk(0x1b78000) = 0x1b78000
open("/usr/lib64/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=110518032, ...}) = 0
mmap(NULL, 110518032, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fa121829000
close(3) = 0
write(2, "resize2fs 1.43.3 (04-Sep-2016)\n", 31resize2fs 1.43.3 (04-Sep-2016)
) = 31
stat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
open("/proc/swaps", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "Filename\t\t\t\tType\t\tSize\tUsed\tPrio"..., 1024) = 101
stat("/dev/sdd2", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 50), ...}) = 0
read(3, "", 1024) = 0
close(3) = 0
open("/proc/mounts", O_RDONLY|O_CLOEXEC) = 3
stat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
futex(0x7fa128740fe8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "sysfs /sys sysfs rw,nosuid,nodev"..., 1024) = 1024
stat("/dev/bcache0", {st_mode=S_IFBLK|0660, st_rdev=makedev(253, 0), ...}) = 0
read(3, "memory 0 0\ncgroup /sys/fs/cgroup"..., 1024) = 1024
stat("/dev/sdd1", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 49), ...}) = 0
read(3, "824k,mode=700,uid=1000,gid=1000 "..., 1024) = 318
stat("/home/fpemud/workspace/syncupd/test/mntdir", {st_mode=S_IFDIR|0755, st_size=1024, ...}) = 0
close(3) = 0
stat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
open("/dev/loop0", O_RDONLY|O_EXCL) = -1 EBUSY (Device or resource busy)
open("/dev/loop0", O_RDWR) = 3
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
close(3) = 0
open("/dev/loop0", O_RDONLY) = 3
fstat(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
ioctl(3, BLKDISCARDZEROES, [1]) = 0
pread64(3, "\0\220\1\0\0@\6\0\0P\0\0`\4\6\0\365\217\1\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 1024, 1024) = 1024
pread64(3, "\6\1\0\0\26\1\0\0&\1\0\0\315\16\364\7\2\0\4\0\0\0\0\0\0\0\0\0\364\7\211l"..., 4096, 2048) = 4096
open("/dev/loop0", O_RDONLY) = 4
uname({sysname="Linux", nodename="fpemud-workstation", ...}) = 0
ioctl(4, BLKGETSIZE64, [524288000]) = 0
close(4) = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 4
fstat(4, {st_mode=S_IFREG|0644, st_size=2997, ...}) = 0
read(4, "# Locale name alias data base.\n#"..., 4096) = 2997
read(4, "", 4096) = 0
close(4) = 0
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/e2fsprogs.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
write(1, "Filesystem at /dev/loop0 is moun"..., 109Filesystem at /dev/loop0 is mounted on /home/fpemud/workspace/syncupd/test/mntdir; on-line resizing required
) = 109
write(1, "old_desc_blocks = 4, new_desc_bl"..., 41old_desc_blocks = 4, new_desc_blocks = 4
) = 41
access("/sys/fs/ext4/features/meta_bg_resize", R_OK) = 0
open("/home/fpemud/workspace/syncupd/test/mntdir", O_RDONLY) = 4
ioctl(4, _IOC(_IOC_WRITE, 0x66, 0x10, 0x08), 0x7ffec9ea15b0

Code:

fpemud-workstation test # uname -a
Linux fpemud-workstation 4.5.5 #1 SMP PREEMPT Sun Nov 13 22:02:07 CST 2016 x86_64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz GenuineIntel GNU/Linux

Code:

fpemud-workstation test # resize2fs
resize2fs 1.43.3 (04-Sep-2016)
Usage: resize2fs [-d debug_flags] [-f] [-F] [-M] [-P] [-p] device [-b|-s|new_size] [-z undo_file]

Last edited by fpemud on Thu Jan 19, 2017 11:48 pm; edited 1 time in total

fpemud
Guru
Guru

Joined: 15 Feb 2012
Posts: 354

Posted: Thu Jan 19, 2017 11:46 pm Post subject: Anyone can help

I upgraded my kernel version to 4.9.4 yestoday, the problem still exists.

Code:

fpemud@fpemud-workstation ~ $ uname -a
Linux fpemud-workstation 4.9.4 #1 SMP PREEMPT Thu Jan 19 08:59:55 CST 2017 x86_64 Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz GenuineIntel GNU/Linux
fpemud@fpemud-workstation ~ $

Please, anyone can help? Is it possibly a kernel bug?

teika
Apprentice

Joined: 19 Feb 2011
Posts: 167
Location: YYYY-MM-DD, period. Have you ever used the Internet?

Posted: Fri Jan 20, 2017 4:59 am Post subject:

Have you done this before "losetup -c"? $ losetup /dev/loop0 abc.img a.sh doesn't have this line...

frostschutz
Advocate

Joined: 22 Feb 2005
Posts: 2977
Location: Germany

Posted: Fri Jan 20, 2017 11:50 am Post subject:

You should probably take this to a mailing list...

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