Bug 846954
| Summary: | qemu-img convert segfaults on zeroed image | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | bugz |
| Component: | qemu-kvm | Assignee: | Kevin Wolf <kwolf> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | low | ||
| Version: | 6.3 | CC: | acathrow, areis, bcao, bsarathy, dyasny, juzhang, mkenneth, qzhang, shuang, virt-maint |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.306.el6 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-02-21 07:38:27 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
bugz
2012-08-09 09:09:32 UTC
Really, one should test one's hypotheses before adding misinformation: 11:41 root@Boomer# cd /tmp/ 11:41 root@Boomer# dd if=/dev/zero count=2880 of=/tmp/fs.img 2880+0 records in 2880+0 records out 1474560 bytes (1.5 MB) copied, 0.00758618 s, 194 MB/s 11:43 root@Boomer# mke2fs /tmp/fs.img mke2fs 1.41.12 (17-May-2010) /tmp/fs.img is not a block special device. Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks 184 inodes, 1440 blocks 72 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=1572864 1 block group 8192 blocks per group, 8192 fragments per group 184 inodes per group Writing inode tables: done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 21 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. 11:43 root@Boomer# qemu-img convert -O qcow -o \? /tmp/fs.img /tmp/null Supported options: size Virtual disk size backing_file File name of a base image encryption Encrypt the image Segmentation fault (core dumped) 11:43 root@Boomer# I've upgraded to urgency Medium, the evidence to me is the program is unusable and I will have to find some other way of converting my real disk images. It also happens with the disk image reported in https://bugzilla.redhat.com/show_bug.cgi?id=847425 It seems almost certainly because of the -o switch: 12:12 root@Boomer# strace -f -e trace=open qemu-img convert -O raw -o\? /media/9a237ce7-ffd6-4872-acc6-d0966783f992/exports/kstest/kstest-disk1.vmdk /tmp/kstest-disk1.img open("/etc/ld.so.cache", O_RDONLY) = 3 open("/lib64/librt.so.1", O_RDONLY) = 3 open("/lib64/libpthread.so.0", O_RDONLY) = 3 open("/lib64/libglib-2.0.so.0", O_RDONLY) = 3 open("/lib64/libaio.so.1", O_RDONLY) = 3 open("/usr/lib64/libusbredirparser.so.0", O_RDONLY) = 3 open("/lib64/libz.so.1", O_RDONLY) = 3 open("/lib64/libc.so.6", O_RDONLY) = 3 open("/tmp/kstest-disk1.img", O_RDONLY|O_NONBLOCK) = 3 Supported options: size Virtual disk size --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV (core dumped) +++ Segmentation fault (core dumped) 12:21 root@Boomer# Thanks for the report. This is fixed by upstream commit fa170c14, posted a backport for RHEL 6.4. Reproduced on qemu-kvm-0.12.1.2-2.295.el6.x86_64. # dd if=/dev/zero count=2880 of=/tmp/fs.img # qemu-img info /tmp/fs.img image: /tmp/fs.img file format: raw virtual size: 1.4M (1474560 bytes) disk size: 1.4M # gdb qemu-img (gdb) r convert -O qcow2 -o \? /tmp/fs.img /tmp/null Starting program: /usr/bin/qemu-img convert -O qcow2 -o \? /tmp/fs.img /tmp/null [Thread debugging using libthread_db enabled] Supported options: size Virtual disk size backing_file File name of a base image backing_fmt Image format of the base image encryption Encrypt the image cluster_size qcow2 cluster size preallocation Preallocation mode (allowed values: off, metadata, full) Program received signal SIGSEGV, Segmentation fault. 0x0000000000000000 in ?? () Missing separate debuginfos, use: debuginfo-install glib2-2.22.5-7.el6.x86_64 glibc-2.12-1.80.el6.x86_64 libaio-0.3.107-10.el6.x86_64 usbredir-0.4.3-1.el6.x86_64 zlib-1.2.3-27.el6.x86_64 (gdb) (gdb) bt #0 0x0000000000000000 in ?? () #1 0x00007ffff7fbb311 in img_convert (argc=<value optimized out>, argv=<value optimized out>) at qemu-img.c:1009 #2 0x00007ffff6cf6cdd in __libc_start_main () from /lib64/libc.so.6 #3 0x00007ffff7fb9619 in _start () ============================= Verified on qemu-kvm-0.12.1.2-2.334.el6.x86_64 and passed. # qemu-img convert -O qcow2 -o \? /tmp/fs.img /tmp/null Supported options: size Virtual disk size backing_file File name of a base image backing_fmt Image format of the base image encryption Encrypt the image cluster_size qcow2 cluster size preallocation Preallocation mode (allowed values: off, metadata, full) [root@t1 home]# So this bug is fixed. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2013-0527.html |