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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/2703.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 2703
-title = "ptimer period sporadically too long"
-state = "closed"
-created_at = "2024-11-27T14:19:00.476Z"
-closed_at = "2025-03-09T00:40:01.337Z"
-labels = ["icount"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2703"
-host-os = "EndeavourOS"
-host-arch = "x86"
-qemu-version = "9.1.0 (v9.1.0-27-g154e0ea1fe-dirty) // custom device added"
-guest-os = "Linux"
-guest-arch = "x86"
-description = """A ptimer in a custom device with a frequency of 10kHz is sporadically called after more than 100,000ns in virtual time have elapsed.
-
-With a icount shift of 4 or 5 this happens almost everytime before the linux guest can even finish booting.
-
-With a shift of 0 this happens very rarely, but it does occur from time to time."""
-reproduce = """1. setup a ptimer with a frequency of 10kHz and assert that the time passed between callbacks is exactly 100,000ns
-2. run
-3. wait for boom"""
-additional = """```
-// Timer setup
-ptimer_transaction_begin(state->timer);
-
-ptimer_set_freq(state->timer, 10000);
-ptimer_run(state->timer, 0);
-   
-ptimer_transaction_commit(state->timer);
-```
-```
-// timer callback
-int64_t now  = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
-static int64_t last = 0;
-if (last > 0)
-{
-   if (now - last != 100000)
-   {
-       fprintf(stderr, "error tick %ld after %ld is incorrect: %ld\\n", now, last, now - last);
-       assert(0);
-   }
-}
-last = now;
-```
-
-```
-error tick 47867503135 after 47867400000 is incorrect: 103135
-qemu-system-x86_64: ../...file.c:119: timer_callback: Assertion `0' failed.
-```"""