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Diffstat (limited to 'gitlab/issues/target_missing/host_missing/accel_KVM/1274.toml')
| -rw-r--r-- | gitlab/issues/target_missing/host_missing/accel_KVM/1274.toml | 42 |
1 files changed, 0 insertions, 42 deletions
diff --git a/gitlab/issues/target_missing/host_missing/accel_KVM/1274.toml b/gitlab/issues/target_missing/host_missing/accel_KVM/1274.toml deleted file mode 100644 index 88d092f75..000000000 --- a/gitlab/issues/target_missing/host_missing/accel_KVM/1274.toml +++ /dev/null @@ -1,42 +0,0 @@ -id = 1274 -title = "Cannot debug init using \"qemu -s -S\" if init is compiled dynamically or if kvm is enabled" -state = "closed" -created_at = "2022-10-25T06:37:16.506Z" -closed_at = "2023-12-01T19:56:42.721Z" -labels = ["Documentation", "GDB", "accel: KVM"] -url = "https://gitlab.com/qemu-project/qemu/-/issues/1274" -host-os = "Debian sid (as of 2022-10-22)" -host-arch = "x86_64" -qemu-version = "QEMU emulator version 7.1.0 (Debian 1:7.1+dfsg-2+b1)" -guest-os = "Debian sid (as of 2022-10-22)" -guest-arch = "x86_64" -description = """I'm trying to connect from host to init process running in guest. I'm using this guide: https://qemu-project.gitlab.io/qemu/system/gdb.html . Everything works well, but there is two problems: -1. Debugging stops to work if I add "-enable-kvm" -2. Debugging stops to work if I remove "-static" when compiling init""" -reproduce = """I have absolutely fresh Debian sid system (as of 2022-10-22). I create the following file on it: -```c -#include <stdio.h> - -int -main () -{ - printf ("a\\n"); - printf ("b\\n"); - for (;;); -} -``` - -Then I compile it so: `gcc -static -g a.c`. Result is saved as `/root/a.out`. Then I run `sync; echo 3 > /proc/sys/vm/drop_caches; sync` to make sure this `/root/a.out` actually got to disk. - -Then I start the host system inside of qemu using well-known `-snapshot /dev/sda` trick. Exact command is here: - -```bash -qemu-system-x86_64 -daemonize -m 300M -s -S -kernel /vmlinuz -initrd /initrd.img -snapshot -append "root=/dev/sda init=/root/a.out" -drive file=/dev/sda,format=raw -``` - -(As you guessed, my disk has no partitions, it directly stores ext4 filesystem.) - -Then I type on host `gdb ./a.out`. And then inside of gdb I type `target remote localhost:1234`, then `br 7` (line 7 is `printf ("b\\n")`, then `c`. Then guest OS boots and reaches init (i. e. `/root/a.out`). And then gdb actually pauses on line 7. I. e. everything works! - -But if I add `-enable-kvm` to qemu command line OR remove `-static` from gcc command line, then breakpoint doesn't work, i. e. gdb doesn't pause on breakpoint, the execution continues and the execution fails to infinite loop.""" -additional = "n/a" |