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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_missing/host_missing/accel_missing/839.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 839
-title = "qxl in COLO secondary node cause QEMU to segmentation fault"
-state = "opened"
-created_at = "2022-01-25T07:47:42.134Z"
-closed_at = "n/a"
-labels = ["device:graphics"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/839"
-host-os = "Ubuntu Linux 20.04"
-host-arch = "x86"
-qemu-version = "v6.2.0"
-guest-os = "Windows 10"
-guest-arch = "x86"
-description = """After COLO checkpoint, the Secondary VM's qemu received segmentation fault while releasing qxl resources in interface_release_resource() routine.     
-i have used gdb and qemu trace to debug Secondary VM's qemu. the object 'qxl->last_release' is null and object 'ring->items[prod].el' != 0, it leads to null pointer dereference.     
-During COLO checkpoint,the Secondary VM's qemu has loaded Primary VM's qxl states,so i think it not need to release qxl resources."""
-reproduce = """1.Startup Primary VM and Secondary VM of COLO mode, and gdb to Secondary VM's qemu.     
-2.Connect to Primary VM's spice server.         
-3.Secondary VM's qemu will receiveing segmentation fault."""
-additional = """gdb to Secondary VM's qemu:     
-   ``` 
-Program received signal SIGSEGV, Segmentation fault.      
-[Switching to Thread 0x7ff9e3bff700 (LWP 44703)]     
-0x0000555555b2e8d6 in interface_release_resource (sin=0x555557d7c8a8, ext=...) at ../hw/display/qxl.c:783     
-783\t        qxl->last_release->next = ext.info->id;    
-(gdb) bt   
-#0  0x0000555555b2e8d6 in interface_release_resource (sin=0x555557d7c8a8, ext=...) at ../hw/display/qxl.c:783    
-#1  0x00007fffd7751dd1 in red_drawable_unref () at /lib64/libspice-server.so.1    
-#2  0x00007fffd771eabe in drawable_unref () at /lib64/libspice-server.so.1    
-#3  0x00007fffd77206a7 in draw_until () at /lib64/libspice-server.so.1   
-#4  0x00007fffd771f7cd in display_channel_draw () at /lib64/libspice-server.so.1   
-#5  0x00007fffd7721b51 in display_channel_process_draw () at /lib64/libspice-server.so.1   
-#6  0x00007fffd7752142 in red_process_display () at /lib64/libspice-server.so.1
-#7  0x00007fffd77521fb in worker_source_dispatch () at /lib64/libspice-server.so.1
-#8  0x00007fffd6c2f049 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
-#9  0x00007fffd6c2f3a8 in g_main_context_iterate.isra.19 () at /lib64/libglib-2.0.so.0
-#10 0x00007fffd6c2f67a in g_main_loop_run () at /lib64/libglib-2.0.so.0
-#11 0x00007fffd775166a in red_worker_main () at /lib64/libspice-server.so.1
-#12 0x00007fffd5658dd5 in start_thread () at /lib64/libpthread.so.0
-#13 0x00007fffd538202d in clone () at /lib64/libc.so.6
-(gdb) frame 0
-#0  0x0000555555b2e8d6 in interface_release_resource (sin=0x555557d7c8a8, ext=...) at ../hw/display/qxl.c:783
-783\t        qxl->last_release->next = ext.info->id;
-(gdb) print qxl->last_release
-$1 = (QXLReleaseInfo *) 0x0
-   ```
-
-qemu trace log:
-   ```
-44840@1643012769.363844:colo_send_message Send 'checkpoint-reply' message
-44840@1643012773.579053:colo_receive_message Receive 'vmstate-send' message
-44840@1643012773.978838:colo_receive_message Receive 'vmstate-size' message
-44840@1643012773.979041:colo_send_message Send 'vmstate-received' message
-44840@1643012774.180598:qxl_pre_load 0
-44703@1643012774.180660:qxl_ring_res_put 0 #res=20
-44840@1643012774.182627:qxl_post_load 0 native
-44840@1643012774.197993:colo_vm_state_change Change 'stop' => 'run'
-44840@1643012774.198030:colo_send_message Send 'vmstate-loaded' message
-   ```"""