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Diffstat (limited to 'gitlab/issues/target_missing/host_missing/accel_TCG/2791.toml')
| -rw-r--r-- | gitlab/issues/target_missing/host_missing/accel_TCG/2791.toml | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/gitlab/issues/target_missing/host_missing/accel_TCG/2791.toml b/gitlab/issues/target_missing/host_missing/accel_TCG/2791.toml deleted file mode 100644 index bfbbb041..00000000 --- a/gitlab/issues/target_missing/host_missing/accel_TCG/2791.toml +++ /dev/null @@ -1,75 +0,0 @@ -id = 2791 -title = "\"Missing character write event in the replay log\" when trying rr=replay with snapshot" -state = "opened" -created_at = "2025-01-23T16:07:25.357Z" -closed_at = "n/a" -labels = ["accel: TCG", "icount"] -url = "https://gitlab.com/qemu-project/qemu/-/issues/2791" -host-os = "Debian testing" -host-arch = "x86" -qemu-version = "Built from `cf86770c7aa31ebd6e56f4eeb25c34107f92c51e" -guest-os = "n/a" -guest-arch = "n/a" -description = """Probably best to just illustrate with commands. Happy path: - -```sh -rm replay.bin snapshots.qcow2; qemu-img create -f qcow2 snapshots.qcow2 256M - -~/src/qemu/build/qemu-system-x86_64 -nodefaults -nographic -serial stdio \\ - -icount shift=auto,rr=record,rrfile=replay.bin,rrsnapshot=init \\ - -drive file=snapshots.qcow2,if=none,id=rr \\ - -kernel ./.kunit/arch/x86/boot/bzImage -append "nokaslr console=ttyS0" - -# It runs, guest kernel crashes when realising it has no rootfs, all good -du -sh snapshots.qcow2 # 976K - -# Repeat same command just switched to rr=replay -~/src/qemu/build/qemu-system-x86_64 -nodefaults -nographic -serial stdio \\ - -icount shift=auto,rr=replay,rrfile=replay.bin,rrsnapshot=init \\ - -drive file=snapshots.qcow2,if=none,id=rr \\ - -kernel ./.kunit/arch/x86/boot/bzImage -append "nokaslr console=ttyS0" -# Much slower, but same result. All good -``` - -But, I want to take a snapshot later in boot. - -```sh -rm replay.bin snapshots.qcow2; qemu-img create -f qcow2 snapshots.qcow2 256M - -# This time, running with debug. Also have to switch to -monitor stdio because of -# https://gitlab.com/qemu-project/qemu/-/issues/2790 -~/src/qemu/build/qemu-system-x86_64 -nodefaults -nographic -monitor stdio \\ - -icount shift=auto,rr=record,rrfile=replay.bin,rrsnapshot=init \\ - -drive file=snapshots.qcow2,if=none,id=rr \\ - -kernel ./.kunit/arch/x86/boot/bzImage -append "nokaslr console=ttyS0" \\ - -s -S - -# In another terminal, attach a debugger, set a breakpoint, continue to the breakpoint -gdb -ex "target remote localhost:1234" .kunit/vmlinux -(gdb) hb start_kernel -(gdb) continue - -# When the breakpoint is hit, back in the first terminal: -(qemu) savevm test -(qemu) quit - -du -sh snapshots.qcow2 # 21M - -# Now try to replay again -~/src/qemu/build/qemu-system-x86_64 -nodefaults -nographic -serial stdio \\ - -icount shift=auto,rr=replay,rrfile=replay.bin,rrsnapshot=init \\ - -drive file=snapshots.qcow2,if=none,id=rr \\ - -kernel ./.kunit/arch/x86/boot/bzImage -append "nokaslr console=ttyS0" -``` - -Result: - -``` -qemu-system-x86_64: Missing character write event in the replay log (insn total 1598039/586 left, event 886 is EVENT_INSTRUCTION) -fish: Job 1, '~/src/qemu/build/qemu-system-x8…' terminated by signal -icount shift=auto,rr=repla… ( -drive file=snapshots.qcow2…) -fish: Job -kernel ./.kunit/arch/x86/b…, 'SIGABRT' terminated by signal Abort () -``` - -Exit code is 134.""" -reproduce = "n/a" -additional = "n/a" |