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Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/manual-review/1497479')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/manual-review/1497479 | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/manual-review/1497479 b/results/classifier/deepseek-2-tmp/output/manual-review/1497479 deleted file mode 100644 index d50ff7683..000000000 --- a/results/classifier/deepseek-2-tmp/output/manual-review/1497479 +++ /dev/null @@ -1,24 +0,0 @@ - -memory corruption with migrate/savevm in TCG mode - -[ISSUE] - -QEMU releases 2.3.1 and lower are forgetting to flush TLBs before enabling the global dirty pages log and entering the final stage of saving the VM. - -[DESCRIPTION] - -The situation is the following: -1. TLB misses is the only way for page dirtying in the TCG mode. -2. If TLB is hit by a running VM during the execution of the `ram_save_iterate' by migration thread (e.g. if VM is mostly idling) then some pages are missing in the dirty log. -3. These pages are then not migrated during `ram_save_complete'. -4. This makes memory content in a saved VM state differ from the actual VM memory. -5. If the affected area includes some Kernel data structures such as trees or lists this can cause Kernel to Oops after loading the saved state. - -[SOLUTION] - -A proposed solution is to flush TLB when `log_global_start' is called. -Here is the patch: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1493049/+attachment/4459905/+files/tcg-commit-on-log-global-start.patch - -[LINKS] - -Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1493049 \ No newline at end of file |