Bug 693741
| Summary: | qemu-img re-base fail with read-only new backing file | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Igor Lvovsky <ilvovsky> |
| Component: | qemu-kvm | Assignee: | Kevin Wolf <kwolf> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.1 | CC: | ehabkost, Jes.Sorensen, juzhang, lpeer, mkenneth, syeghiay, tburke, virt-maint |
| Target Milestone: | rc | Keywords: | Regression |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.157.el6 | Doc Type: | Bug Fix |
| Doc Text: |
Cause: qemu-img tries to open backing file read-write.
Consequence: qemu-img rebase fail new backing file is read-only.
Fix: qemu-img rebase open new backing file as read-only.
Result: 'qemu-img rebase' works even if new backing file is read-only.
|
Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-05-19 11:21:24 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 693283 | ||
Since RHEL 6.1 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. Tested qemu-kvm-0.12.1.2-2.153.el6.x86_64,didn't hit the comment0's problem.any mistake,please fix me. 1.set up nfs server #cat /etc/exports /mnt *(rw,no_root_squash) 2. mount nfs server #mount 10.66.8.113:/mnt/ nfs 3.create base.img and change to read only state 3.1 qemu-img create -f qcow2 base.qcow2 100M chmod 440 base_img 3.2 #qemu-img create -f qcow2 -b base.qcow2 -F qcow2 sn1.qcow2 chmod 740 sn1.qcow2 3.3 #qemu-img create -f qcow2 -b sn1.qcow2 -F qcow2 sn2.qcow2 chmod 740 sn２.qcow2 #ll total 416 -r--r-----. 1 nobody nobody 262144 Apr 6 2011 base.qcow2 drwxr-xr-x. 2 nobody nobody 4096 Jan 4 11:28 images -rwxr-----. 1 nobody nobody 262144 Apr 6 2011 sn1.qcow2 -rwxr-----. 1 nobody nobody 262144 Apr 6 2011 sn2.qcow2 drwxr-xr-x. 2 nobody nobody 4096 Jan 4 11:28 windows 4.rebase sn2 #strace qemu-img rebase -f qcow2 -b base.qcow2 -F qcow2 sn2.qcow2 execve("/usr/bin/qemu-img", ["qemu-img", "rebase", "-f", "qcow2", "-b", "base.qcow2", "-F", "qcow2", "sn2.qcow2"], [/* 30 vars */]) = 0 brk(0) = 0x175e000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f902e7000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=56949, ...}) = 0 mmap(NULL, 56949, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2f902d9000 close(3) = 0 open("/lib64/librt.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@!\0\3578\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=47072, ...}) = 0 mmap(0x38ef000000, 2128816, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38ef000000 mprotect(0x38ef007000, 2093056, PROT_NONE) = 0 mmap(0x38ef206000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x38ef206000 close(3) = 0 open("/lib64/libpthread.so.0", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20\\\300\3568\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=145672, ...}) = 0 mmap(0x38eec00000, 2212768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38eec00000 mprotect(0x38eec17000, 2097152, PROT_NONE) = 0 mmap(0x38eee17000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x38eee17000 mmap(0x38eee19000, 13216, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x38eee19000 close(3) = 0 open("/lib64/libaio.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\5\0\3568\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=5624, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f902d8000 mmap(0x38ee000000, 2099840, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38ee000000 mprotect(0x38ee001000, 2093056, PROT_NONE) = 0 mmap(0x38ee200000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0x38ee200000 close(3) = 0 open("/lib64/libz.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\36\300\3578\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=88240, ...}) = 0 mmap(0x38efc00000, 2181040, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38efc00000 mprotect(0x38efc15000, 2093056, PROT_NONE) = 0 mmap(0x38efe14000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x38efe14000 close(3) = 0 open("/lib64/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260\355A\3568\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1908648, ...}) = 0 mmap(0x38ee400000, 3733672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x38ee400000 mprotect(0x38ee587000, 2093056, PROT_NONE) = 0 mmap(0x38ee786000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x186000) = 0x38ee786000 mmap(0x38ee78b000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x38ee78b000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f902d7000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f902d6000 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f902d5000 arch_prctl(ARCH_SET_FS, 0x7f2f902d6700) = 0 mprotect(0x38ee786000, 16384, PROT_READ) = 0 mprotect(0x38eee17000, 4096, PROT_READ) = 0 mprotect(0x38ef206000, 4096, PROT_READ) = 0 mprotect(0x38ede1d000, 4096, PROT_READ) = 0 munmap(0x7f2f902d9000, 56949) = 0 set_tid_address(0x7f2f902d69d0) = 7859 set_robust_list(0x7f2f902d69e0, 0x18) = 0 futex(0x7fff18175bcc, FUTEX_WAKE_PRIVATE, 1) = 0 futex(0x7fff18175bcc, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7f2f902d6700) = -1 EAGAIN (Resource temporarily unavailable) rt_sigaction(SIGRTMIN, {0x38eec05a90, [], SA_RESTORER|SA_SIGINFO, 0x38eec0f520}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {0x38eec05b20, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x38eec0f520}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 getrlimit(RLIMIT_STACK, {rlim_cur=10240*1024, rlim_max=RLIM_INFINITY}) = 0 brk(0) = 0x175e000 brk(0x177f000) = 0x177f000 open("sn2.qcow2", O_RDONLY|O_NONBLOCK) = 3 ioctl(3, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(3) = 0 stat("sn2.qcow2", {st_mode=S_IFREG|0740, st_size=262144, ...}) = 0 open("sn2.qcow2", O_RDWR|O_CLOEXEC) = 3 rt_sigprocmask(SIG_BLOCK, [USR2], NULL, 8) = 0 signalfd(4294967295, [USR2], 8) = 4 fcntl(4, F_GETFD) = 0 fcntl(4, F_SETFD, FD_CLOEXEC) = 0 fcntl(4, F_SETFL, O_RDONLY|O_NONBLOCK) = 0 lseek(3, 0, SEEK_END) = 262144 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f901d4000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8ffd3000 brk(0x17a0000) = 0x17a0000 pread(3, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 open("sn1.qcow2", O_RDONLY|O_NONBLOCK) = 5 ioctl(5, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(5) = 0 stat("sn1.qcow2", {st_mode=S_IFREG|0740, st_size=262144, ...}) = 0 open("sn1.qcow2", O_RDONLY|O_CLOEXEC) = 5 lseek(5, 0, SEEK_END) = 262144 pread(5, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8fed2000 brk(0x17c2000) = 0x17c2000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8fcd1000 pread(5, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(5, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(5, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(5, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 brk(0x17e3000) = 0x17e3000 open("base.qcow2", O_RDONLY|O_NONBLOCK) = 6 ioctl(6, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(6) = 0 stat("base.qcow2", {st_mode=S_IFREG|0440, st_size=262144, ...}) = 0 open("base.qcow2", O_RDONLY|O_CLOEXEC) = 6 lseek(6, 0, SEEK_END) = 262144 pread(6, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(6, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8fbd0000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f9cf000 brk(0x1813000) = 0x1813000 pread(6, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(6, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 open("sn1.qcow2", O_RDONLY|O_NONBLOCK) = 7 ioctl(7, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(7) = 0 stat("sn1.qcow2", {st_mode=S_IFREG|0740, st_size=262144, ...}) = 0 open("sn1.qcow2", O_RDONLY|O_CLOEXEC) = 7 lseek(7, 0, SEEK_END) = 262144 pread(7, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(7, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f8ce000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f6cd000 brk(0x1835000) = 0x1835000 pread(7, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(7, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(7, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(7, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 open("base.qcow2", O_RDONLY|O_NONBLOCK) = 8 ioctl(8, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(8) = 0 stat("base.qcow2", {st_mode=S_IFREG|0440, st_size=262144, ...}) = 0 open("base.qcow2", O_RDONLY|O_CLOEXEC) = 8 lseek(8, 0, SEEK_END) = 262144 pread(8, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(8, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f5cc000 brk(0x1856000) = 0x1856000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f3cb000 pread(8, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(8, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 brk(0x1877000) = 0x1877000 open("base.qcow2", O_RDONLY|O_NONBLOCK) = 9 ioctl(9, CDROM_DRIVE_STATUS, 0x7fffffff) = -1 ENOTTY (Inappropriate ioctl for device) close(9) = 0 stat("base.qcow2", {st_mode=S_IFREG|0440, st_size=262144, ...}) = 0 open("base.qcow2", O_RDWR|O_CLOEXEC) = 9 lseek(9, 0, SEEK_END) = 262144 pread(9, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pread(9, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 512, 65536) = 512 mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f2ca000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8f0c9000 brk(0x1898000) = 0x1898000 pread(9, "\0\0\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 65536, 131072) = 65536 pread(9, "QFI\373\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8eec8000 mmap(NULL, 2101248, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f2f8ecc7000 munmap(0x7f2f8eec8000, 2101248) = 0 munmap(0x7f2f8ecc7000, 2101248) = 0 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pwrite(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 fdatasync(3) = 0 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pwrite(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 fdatasync(3) = 0 pread(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\t\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 pwrite(3, "QFI\373\0\0\0\2\0\0\0\0\0\0\0X\0\0\0\n\0\0\0\20\0\0\0\0\6@\0\0"..., 512, 0) = 512 fdatasync(3) = 0 munmap(0x7f2f8f5cc000, 1052672) = 0 munmap(0x7f2f8f3cb000, 2101248) = 0 close(8) = 0 munmap(0x7f2f8f8ce000, 1052672) = 0 munmap(0x7f2f8f6cd000, 2101248) = 0 close(7) = 0 munmap(0x7f2f8f2ca000, 1052672) = 0 munmap(0x7f2f8f0c9000, 2101248) = 0 close(9) = 0 munmap(0x7f2f8fbd0000, 1052672) = 0 munmap(0x7f2f8f9cf000, 2101248) = 0 close(6) = 0 munmap(0x7f2f8fed2000, 1052672) = 0 munmap(0x7f2f8fcd1000, 2101248) = 0 close(5) = 0 munmap(0x7f2f901d4000, 1052672) = 0 munmap(0x7f2f8ffd3000, 2101248) = 0 close(3) = 0 exit_group(0) = ? 5 #echo $? 0 6.#qemu-img info sn2.qcow2 image: sn2.qcow2 file format: qcow2 virtual size: 100M (104857600 bytes) disk size: 136K cluster_size: 65536 backing file: base.qcow2 (actual path: base.qcow2) You don't even need NFS. This is how I reproduced the bug (on a git tree corresponding to -154): $ ./qemu-img create -f qcow2 /tmp/base.qcow2 4G Formatting '/tmp/base.qcow2', fmt=qcow2 size=4294967296 encryption=off cluster_size=0 $ ./qemu-img create -f qcow2 /tmp/base_new.qcow2 4G Formatting '/tmp/base_new.qcow2', fmt=qcow2 size=4294967296 encryption=off cluster_size=0 $ ./qemu-img create -f qcow2 -b /tmp/base.qcow2 /tmp/sn1 Formatting '/tmp/sn1', fmt=qcow2 size=4294967296 backing_file='/tmp/base.qcow2' encryption=off cluster_size=0 $ chmod 444 /tmp/base.qcow2 $ chmod 444 /tmp/base_new.qcow2 $ ./qemu-img rebase -b /tmp/base_new.qcow2 /tmp/sn1 qemu-img: Could not open new backing file '/tmp/base_new.qcow2' Both can reproduce using comment0 and comment3 steps with qemu-kvm-0.12.1.2-2.154.el6.x86_6.mark qa_ack+. Verified this issue with qemu-kvm-0.12.1.2-2.158.el6.x86_64 Results: [test@dhcp-91-174 test1]$ qemu-img rebase -b base_new.qcow2 sn1 [test@dhcp-91-174 test1]$ qemu-img info sn1 image: sn1 file format: qcow2 virtual size: 4.0G (4294967296 bytes) disk size: 136K cluster_size: 65536 backing file: base_new.qcow2 (actual path: base_new.qcow2)
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Cause: qemu-img tries to open backing file read-write.
Consequence: qemu-img rebase fail new backing file is read-only.
Fix: qemu-img rebase open new backing file as read-only.
Result: 'qemu-img rebase' works even if new backing file is read-only.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0534.html An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0534.html |
Description of problem: qemu-img rebase fail on NFS setup (work fine on block devices) For given chain: baseVol --> sn1 --> sn2 'baseVol' is readonly 'sn1' and 'sn2' are readwrite Now, I run a command: qemu-img rebase -f qcow2 -b baseVol -F qcow2 sn2 qemu-img try to open 'baseVol' with O_RDWR and fail. Actually, this bug was solved already in qemu-img-112 but introduced again in 134 Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info: