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-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"