Bug 679127
| Summary: | Multiple running applications cause hanging/failing | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Marian Krcmarik <mkrcmari> | ||||
| Component: | qemu-kvm | Assignee: | Uri Lublin <uril> | ||||
| Status: | CLOSED DUPLICATE | QA Contact: | Virtualization Bugs <virt-bugs> | ||||
| Severity: | urgent | Docs Contact: | |||||
| Priority: | urgent | ||||||
| Version: | 6.1 | CC: | khong, lkocman, mhasko, mkenneth, tburke, uril, virt-maint | ||||
| Target Milestone: | rc | Keywords: | Regression, TestBlocker, Triaged | ||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2011-03-03 13:36:39 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: | |||||||
| Attachments: |
|
||||||
|
Description
Marian Krcmarik
2011-02-21 16:54:58 UTC
From bt:
#0 __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:136
#1 0x0000003fe2e09345 in _L_lock_870 () from /lib64/libpthread.so.0
#2 0x0000003fe2e09217 in __pthread_mutex_lock (mutex=0x8e39a0) at pthread_mutex_lock.c:61
#3 0x000000000042af4e in kvm_mutex_lock () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2580
#4 0x000000000040b8d8 in main_loop_wait (timeout=1000) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4418
#5 0x000000000042b2fa in kvm_main_loop () at /usr/src/debug/qemu-kvm-0.12.1.2/qemu-kvm.c:2165
#6 0x000000000040ef0f in main_loop (argc=<value optimized out>, argv=<value optimized out>,
envp=<value optimized out>) at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:4634
#7 main (argc=<value optimized out>, argv=<value optimized out>, envp=<value optimized out>)
at /usr/src/debug/qemu-kvm-0.12.1.2/vl.c:6848
Seems like it happens only with -vga qxl set (guest driver doesn't matter) I got the same freeze with vesa and qxl. I'm getting kicked off the session after like 20 seconds of usage. This does happen also with single vcpu Created attachment 480718 [details]
multi-threaded backtrace
Attached multi-threaded backtrace, qemu-kvm hanged right after start of guest's X. CL was:
$ qemu-kvm -smp 2 -m 1024 -name rhel6_32 -enable-kvm -spice port=3001,disable-ticketing -soundhw ac97 -vga qxl /dev/root_vg/q-rhel6_32
From origin: > Additional info: > Sometimes only session is logged out instead of failing/hanging. reported as separate bug: https://bugzilla.redhat.com/show_bug.cgi?id=680120 I could not reproduce with a single vcpu and some applications running (did not try too hard). Easily reproduced the "hanging" part of the bug with "chvt 4" and trying to chvt back to the X console. It seems that the problem is missing mutex unlocks. We have a patch upstream (spice upstream not qemu) that fixes such issues; and specifically, the exact same issue that we've encountered -- in qxl_add_memslot. Upstream in (spice) patch: 4855161da1f6dbc129593487814cd8518016de20 (In reply to comment #9) > I could not reproduce with a single vcpu and some applications running (did not > try too hard). scratch that. Easily reproduced following the instructions in #comment0 ("Steps to Reproduce"), sometimes even before that when X starts. I guess I was just lucky earlier and I did not try too hard (used chvt instead of installing OOO). This bug looks like a duplicate of 678208 to me, especially when looking at the stack trace (comment#2). *** This bug has been marked as a duplicate of bug 678208 *** |