Bug 798499
| Summary: | Guest aborted sometimes when quit it after a savevm | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Qunfang Zhang <qzhang> |
| Component: | qemu-kvm | Assignee: | Kevin Wolf <kwolf> |
| Status: | CLOSED WONTFIX | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 6.3 | CC: | acathrow, areis, bsarathy, juzhang, kwolf, michen, mkenneth, pbonzini, shu, sluo, tburke, virt-maint, wdai |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-06-22 15:15:59 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: | |||
savevm is not supported. I'm leaving the bug open to see if the abort is rlevant to other scenarios. Looks like we're forgetting to call qcow2_cache_put() in some error path. Reproducing this only with qemu-io/qemu-img, so that we have a fully deteministic scriptable test case would be good. From bug 807894 comment 9, this was seen also with external snapshots: (qemu) snapshot_blkdev drive-virtio-disk0 /root/sn1 qcow2 (qemu) block_stream drive-virtio-disk0 (qemu) quit qemu-kvm core dump: Program terminated with signal 6, Aborted. #0 0x00007f5400ae1885 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 64 return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig); (gdb) bt #0 0x00007f5400ae1885 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 #1 0x00007f5400ae3065 in abort () at abort.c:92 #2 0x00007f5400ada9fe in __assert_fail_base (fmt=<value optimized out>, assertion=0x7f540330b286 "c->entries[i].ref == 0", file=0x7f540330b25b "block/qcow2-cache.c", line=<value optimized out>, function=<value optimized out>) at assert.c:96 #3 0x00007f5400adaac0 in __assert_fail (assertion=0x7f540330b286 "c->entries[i].ref == 0", file=0x7f540330b25b "block/qcow2-cache.c", line=69, function=0x7f540330b2b0 "qcow2_cache_destroy") at assert.c:105 #4 0x00007f54031b4324 in qcow2_cache_destroy (bs=<value optimized out>, c=0x7f54049dcd70) at block/qcow2-cache.c:69 #5 0x00007f54031ae34a in qcow2_close (bs=0x7f54047e4010) at block/qcow2.c:628 #6 0x00007f5403197f21 in bdrv_close (bs=0x7f54047e4010) at block.c:693 #7 0x00007f5403198068 in bdrv_close_all () at block.c:717 #8 0x00007f5403184985 in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2270 #9 0x00007f5403165cec in main_loop (argc=20, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4202 #10 main (argc=20, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6427 Hm, this seems to be related to quitting while streaming. Better open a separate bug. (In reply to comment #6) > Hm, this seems to be related to quitting while streaming. Better open a > separate bug. Discussed this with Kevin, I'm moving it to 6.4 (savevm is not supported, but it's still worth some investigation in the near future). Paolo, I assume you'll take care of the streaming case, even though this bug currently blocks the blk_mirror bug. Yes, the streaming case is bug 807898. Mirror+streaming is broken beyond possibility of saving it, so I removed bug 806432 from the blocks list of this one. savevm is not supported and the streaming case has been investigated by Paolo. Closing as WONTFIX. |
Description of problem: Boot a guest (I tested rhel5.8-64 and rhel6.3-64) and savevm, after finish save the internal snapshot, quit the command line. Aborted occurs. I attach a virtual floppy with qcow2 format in the command line. I'm not very sure whether it is related the floppy because this issue is not 100% reproduced. Re-test 7 times without floppy, did not reproduce the issue. Version-Release number of selected component (if applicable): kernel-2.6.32-241.el6.x86_64 qemu-kvm-0.12.1.2-2.233.el6.x86_64 How reproducible: 2/10 Steps to Reproduce: 0.Pre-install a rhel guest and create a 1.4M floppy disk. #qemu-img create -f qcow2 floppy.qcow2 1474560 1. Boot a guest: (gdb) r -M rhel6.3.0 -cpu cpu64-rhel6 -enable-kvm -m 4G -smp 2,sockets=1,cores=2,threads=1 -name rhel5.8-64 -uuid 125b7bc8-1b37-49e9-9a33-7e8917c34b88 -rtc base=localtime,driftfix=slew -device virtio-serial-pci,id=virtio-serial0,max_ports=16,bus=pci.0,addr=0x4 -drive file=/home/RHEL-Server-5.8-64-virtio.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop,aio=native -device ide-drive,bus=ide.0,unit=1,drive=drive-virtio-disk0,id=virtio-disk0 -netdev tap,id=hostnet0,vhost=on,script=/etc/qemu-ifup -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:42:1a:52,bus=pci.0,addr=0x3 -chardev socket,id=charchannel0,path=/tmp/qzhang-test,server,nowait -device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.rhevm.vdsm -spice port=5930,disable-ticketing -vga qxl -global qxl-vga.vram_size=33554432 -usb -device usb-tablet,id=input0 -device virtio-balloon-pci,id=balloon0,addr=0x7 -boot c -monitor stdio -drive file=/home/floppy.qcow2,if=none,id=drive-fdc0-0-0,format=qcow2,cache=none -global isa-fdc.driveA=drive-fdc0-0-0 2.(qemu)savevm 3.(qemu)quit (after finish the savevm) Actual results: (qemu) (qemu) savevm handle_dev_input: stop [New Thread 0x7ffff05ec700 (LWP 17083)] handle_dev_input: start (qemu) (qemu) (qemu) q [New Thread 0x7ffed7bfd700 (LWP 17106)] qemu-kvm: block/qcow2-cache.c:69: qcow2_cache_destroy: Assertion `c->entries[i].ref == 0' failed. Program received signal SIGABRT, Aborted. 0x00007ffff500e885 in raise () from /lib64/libc.so.6 (gdb) (gdb) (gdb) bt #0 0x00007ffff500e885 in raise () from /lib64/libc.so.6 #1 0x00007ffff5010065 in abort () from /lib64/libc.so.6 #2 0x00007ffff50079fe in __assert_fail_base () from /lib64/libc.so.6 #3 0x00007ffff5007ac0 in __assert_fail () from /lib64/libc.so.6 #4 0x00007ffff7e4d1f4 in qcow2_cache_destroy (bs=<value optimized out>, c=0x7ffff86d7640) at block/qcow2-cache.c:69 #5 0x00007ffff7e470ba in qcow2_close (bs=<value optimized out>) at block/qcow2.c:625 #6 0x00007ffff7e31531 in bdrv_close (bs=0x7ffff86eb2c0) at block.c:665 #7 0x00007ffff7e315a8 in bdrv_close_all () at block.c:688 #8 0x00007ffff7e1e2a5 in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2249 #9 0x00007ffff7e0047c in main_loop (argc=20, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4228 #10 main (argc=20, argv=<value optimized out>, envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6489 Expected results: Guest should quit normally. Additional info: Once when savevm, qemu prompts error, and then quit qemu causing an aborted.But I only saw this error for only once. (qemu) savevm handle_dev_input: stop Error while creating snapshot on 'drive-fdc0-0-0' handle_dev_input: start