小型转储是崩溃时进程的内存转储， 有助于调试崩溃原因。
本教程将详细介绍调试工作流程，该工作流程会将 minidump 文件加载到 zxdb，然后详细介绍调试步骤，以了解 minidump 捕获的失败情况。
捕获小型转储文件
您可以使用 savedump 命令从 zxdb 中的任何调试会话中捕获迷你转储。
例如，如果您对 cobalt.cm 组件使用 zxdb：
ffx component debug cobalt.cm您应该会看到如下所示的输出：
Waiting for process matching "job 20999".
Type "filter" to see the current filters.
👉 To get started, try "status" or "help".
Attached Process 1 state=Running koid=21246 name=cobalt.cm component=cobalt.cm
Loading 15 modules for cobalt.cm ...Done.
如果您想捕获 minidump，则需要先 pause 调试程序：
pause
您应该会看到如下所示的输出：
508 const zx_port_packet_t* packet))
509
▶ 510 BLOCKING_SYSCALL(port_wait, zx_status_t, /* no attributes */, 3, (handle, deadline, packet),
511 (_ZX_SYSCALL_ANNO(use_handle("Fuchsia")) zx_handle_t handle, zx_time_t deadline,
512 zx_port_packet_t* packet))
🛑 thread 1 $elf(SYSCALL_zx_port_wait) + 0x7 • syscalls.inc:510
使用 savedump 保存 minidump：
savedump cobalt.dump
您应该会看到如下所示的输出：
Saving minidump...
Minidump written to cobalt.dump
保存迷你转储后，您可以退出调试程序：
quit
您的迷你转储现在保存在工作目录中。您现在可以加载了 并调试该小型转储文件
加载和调试 minidump 文件
无论您尝试调试的组件的语言如何，在 zxdb 中加载和调试 minidump 文件的方式都是相同的。不过，也有一些 不同语言中应注意的事项有所不同。
Rust
如需将迷你转储文件加载到 zxdb，您可以使用
ffx debug core。对于 例如，加载名为archivist_unittest.dump的迷你转储文件：ffx debug core archivist_unittest.dump您应该会看到如下所示的输出：
Opening dump file... Dump loaded successfully. 👉 To get started, try "status" or "help". Attached Process 1 state=Running koid=14446435 name=<_> Loading 6 modules for <_> Downloading symbols... Done. 🛑 (no location information) Attached Process 2 state=Running koid=14446435 name=<_> Attaching to previously connected processes: 14446435: <_> Loading 6 modules for <_> Done. Symbol downloading complete. 5 succeeded, 0 failed.列出堆栈帧：
frame您应该会看到如下所示的输出：
▶ 0 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::test_entry_point::λ(…) • archivist.rs:547 1 core::future::future::«impl»::poll<…>(…) • future/future.rs:123 2 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:27 3 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:122 4 fuchsia_async::atomic_future::«impl»::poll<…>(…) • atomic_future.rs:72 5 fuchsia_async::atomic_future::AtomicFuture::try_poll(…) • atomic_future.rs:230 6 fuchsia_async::runtime::fuchsia::executor::common::Executor::try_poll(…) • executor/common.rs:554 7 fuchsia_async::runtime::fuchsia::executor::common::Executor::poll_ready_tasks(…) • executor/common.rs:133 8 fuchsia_async::runtime::fuchsia::executor::common::Executor::worker_lifecycle<…>(…) • executor/common.rs:429 9 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run<…>(…) • executor/local.rs:104 10 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run_singlethreaded<…>(…) • executor/local.rs:70 11 fuchsia_async::test_support::«impl»::run_singlethreaded::λ() • test_support.rs:120 12 fuchsia_async::test_support::Config::in_parallel(…) • test_support.rs:215 13 fuchsia_async::test_support::«impl»::run_singlethreaded(…) • test_support.rs:117 14 fuchsia_async::test_support::run_singlethreaded_test<…>(…) • test_support.rs:227 15 fuchsia::test_singlethreaded<…>(…) • fuchsia/src/lib.rs:195 16 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log() • archivist.rs:524 17 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::λ(…) • archivist.rs:525 18 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 19 core::ops::function::FnOnce::call_once<…>(…) • library/core/src/ops/function.rs:250 (inline) 20 test::__rust_begin_short_backtrace<…>(…) • library/test/src/lib.rs:625 21 test::run_test_in_spawned_subprocess(…) • library/test/src/lib.rs:753 22 test::test_main_static_abort(…) • library/test/src/lib.rs:199 23 archivist_lib_lib_test::main() • archivist/src/lib.rs:1 24 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 25 std::sys::backtrace::__rust_begin_short_backtrace<…>(…) • fuchsia-third_party-rust/library/std/src/sys/backtrace.rs:155 26 std::rt::lang_start::λ() • fuchsia-third_party-rust/library/std/src/rt.rs:159 27 core::ops::function::impls::«impl»::call_once<…>(…) • library/core/src/ops/function.rs:284 (inline) 28 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) 29 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 30 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 31 std::rt::lang_start_internal::λ() • library/std/src/rt.rs:141 (inline) 32 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) 33 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 34 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 35 std::rt::lang_start_internal(…) • library/std/src/rt.rs:141 36 std::rt::lang_start<…>(…) • fuchsia-third_party-rust/library/std/src/rt.rs:158 37 $elf(main) + 0x21 38…40 «libc startup» (-r expands)现在，您可以使用快捷键在所有会话中快速执行操作。
列出每个线程的帧：
thread * frame您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=14450503 name="" ▶ 0 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::test_entry_point::λ(…) • archivist.rs:547列出每个线程的帧，但要提供更多详细信息，您可以将
thread与backtrace动词组合使用：thread * backtrace此命令可帮助您查看每个堆栈帧的局部变量。请注意，minidump 中仅捕获堆栈内存，以缩短捕获时间并减小文件大小。指向堆变量的指针通常不 解析为任何有用的内容
您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=14450503 name="" ▶ 0 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::test_entry_point::λ(…) • archivist.rs:547 (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 1 core::future::future::«impl»::poll<…>(…) • future/future.rs:123 self = Pin<&mut core::pin::Pin<alloc…>{__pointer: (*)0xa2987a4580} cx = (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 2 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:27 (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 3 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:122 (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 4 fuchsia_async::atomic_future::«impl»::poll<…>(…) • atomic_future.rs:72 self = (*)0xa2987a4520 cx = (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 5 fuchsia_async::atomic_future::AtomicFuture::try_poll(…) • atomic_future.rs:230 self = (*)0x9d587a4118 cx = (*)0x5c626904e0 ➔ Context{waker: (*)0x5c626904c8, local_waker: (*)0x5c626904c8, ext: AssertUnwindSafe<core::task::wake::ExtData>(…), _marker: PhantomData<fn(&())->&()>, _marker2: PhantomData<*mut()>} 6 fuchsia_async::runtime::fuchsia::executor::common::Executor::try_poll(…) • executor/common.rs:554 self = (*)0x9b187a9300 task = (*)0x5c62690588 ➔ (*)0x9d587a40f0 7 fuchsia_async::runtime::fuchsia::executor::common::Executor::poll_ready_tasks(…) • executor/common.rs:133 self = (*)0x9b187a9300 local_collector = (*)0x5c62690600 ➔ LocalCollector{collector: (*)0x9b187a9438, last_ticks: 1050997948718604, polls: 1, tasks_pending_max: 10} 8 fuchsia_async::runtime::fuchsia::executor::common::Executor::worker_lifecycle<…>(…) • executor/common.rs:429 self = (*)0xa4187a90a0 9 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run<…>(…) • executor/local.rs:104 self = (*)0x5c62690878 ➔ LocalExecutor{ehandle: EHandle{…}} main_future = AtomicFuture{state: AtomicUsize{1}, future: UnsafeCell{$(alloc::boxed::Box<dyn fuchsia_async::atomic_future::FutureOrResultAccess, alloc::alloc::Global>){…}}} 10 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run_singlethreaded<…>(…) • executor/local.rs:70 self = (*)0x5c62690878 ➔ LocalExecutor{ehandle: EHandle{…}} main_future = Unresumed{run_stream: (*)0xa3187a86a0, test: λ{…}} 11 fuchsia_async::test_support::«impl»::run_singlethreaded::λ() • test_support.rs:120 12 fuchsia_async::test_support::Config::in_parallel(…) • test_support.rs:215 self = (*)0x5c62690ae8 ➔ Config{repeat_count: 1, max_concurrency: 0, max_threads: 0, timeout: …} f = <The value of type '*const alloc::sync::ArcInner<(dyn core::ops::function::Fn<(), Output=()> + core::marker::Send + core::marker::Sync)>' is the incorrect size (expecting 8, got 16). Please file a bug.> 13 fuchsia_async::test_support::«impl»::run_singlethreaded(…) • test_support.rs:117 test = <The value of type '*const alloc::sync::ArcInner<(dyn core::ops::function::Fn<(usize), Output=core::pin::Pin<alloc::boxed::Box<dyn core::future::future::Future<Output=()>, alloc::alloc::Global>>> + core::marker::Send + core::marker::Sync)>' is the incorrect size (expecting 8, got 16). Please file a bug.> cfg = Config{repeat_count: 1, max_concurrency: 0, max_threads: 0, timeout: None<Duration>} 14 fuchsia_async::test_support::run_singlethreaded_test<…>(…) • test_support.rs:227 test = <Unavailable> 15 fuchsia::test_singlethreaded<…>(…) • fuchsia/src/lib.rs:195 f = <Register rdi not available.> 16 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log() • archivist.rs:524 17 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::λ(…) • archivist.rs:525 (*)0x5c62690bde ➔ λ 18 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 λ <Value has no data.> 19 core::ops::function::FnOnce::call_once<…>(…) • library/core/src/ops/function.rs:250 (inline) <Register rsi not available.> <Optimized out> 20 test::__rust_begin_short_backtrace<…>(…) • library/test/src/lib.rs:625 f = <Register rsi not available.> 21 test::run_test_in_spawned_subprocess(…) • library/test/src/lib.rs:753 desc = <Register rdi not available.> runnable_test = Static(&core::ops::function::FnOnce::call_once<archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::{closure_env#0}, ()>) 22 test::test_main_static_abort(…) • library/test/src/lib.rs:199 tests = <Unavailable> 23 archivist_lib_lib_test::main() • archivist/src/lib.rs:1 24 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 &archivist_lib_lib_test::main <Value has no data.> 25 std::sys::backtrace::__rust_begin_short_backtrace<…>(…) • fuchsia-third_party-rust/library/std/src/sys/backtrace.rs:155 f = &archivist_lib_lib_test::main 26 std::rt::lang_start::λ() • fuchsia-third_party-rust/library/std/src/rt.rs:159 27 core::ops::function::impls::«impl»::call_once<…>(…) • library/core/src/ops/function.rs:284 (inline) self = $(&(dyn core::ops::function::Fn<(), Output=i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe)){pointer: (*)0x5c62690f50 ➔ $((dyn core::ops::function::Fn<(), Output=i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe)), vtable = <Invalid data offset 8 in object of size 8.>} args = <Optimized out> 28 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) data = <Optimized out> 29 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 30 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 31 std::rt::lang_start_internal::λ() • library/std/src/rt.rs:141 (inline) 32 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) data = <Optimized out> 33 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 34 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 35 std::rt::lang_start_internal(…) • library/std/src/rt.rs:141 main = $(&(dyn core::ops::function::Fn<(), Output=i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe)){pointer: (*)0x5c62690f50 ➔ $((dyn core::ops::function::Fn<(), Output=i32> + core::marker::Sync + core::panic::unwind_safe::RefUnwindSafe)), vtable: (*)0x13a66000958} argc = <Register rdx not available.> argv = <Register rcx not available.> sigpipe = <Register r8 not available.> 36 std::rt::lang_start<…>(…) • fuchsia-third_party-rust/library/std/src/rt.rs:158 main = &archivist_lib_lib_test::main argc = 2 argv = (*)0xecf9d19fb0 sigpipe = 0 37 $elf(main) + 0x21 38…40 «libc startup» (-r expands)列出当前线程：
thread您应该会看到如下所示的输出：
# state koid name ▶ 1 Core Dump 14450503列出特定会话。例如
thread 1：thread 1您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=14450503 name=""然后，您可以使用
frame从thread 1查看此特定堆栈帧：frame您应该会看到如下所示的输出：
▶ 0 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::test_entry_point::λ(…) • archivist.rs:547 1 core::future::future::«impl»::poll<…>(…) • future/future.rs:123 2 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:27 3 fuchsia_async::test_support::«impl»::run_singlethreaded::λ::λ(…) • test_support.rs:122 4 fuchsia_async::atomic_future::«impl»::poll<…>(…) • atomic_future.rs:72 5 fuchsia_async::atomic_future::AtomicFuture::try_poll(…) • atomic_future.rs:230 6 fuchsia_async::runtime::fuchsia::executor::common::Executor::try_poll(…) • executor/common.rs:554 7 fuchsia_async::runtime::fuchsia::executor::common::Executor::poll_ready_tasks(…) • executor/common.rs:133 8 fuchsia_async::runtime::fuchsia::executor::common::Executor::worker_lifecycle<…>(…) • executor/common.rs:429 9 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run<…>(…) • executor/local.rs:104 10 fuchsia_async::runtime::fuchsia::executor::local::LocalExecutor::run_singlethreaded<…>(…) • executor/local.rs:70 11 fuchsia_async::test_support::«impl»::run_singlethreaded::λ() • test_support.rs:120 12 fuchsia_async::test_support::Config::in_parallel(…) • test_support.rs:215 13 fuchsia_async::test_support::«impl»::run_singlethreaded(…) • test_support.rs:117 14 fuchsia_async::test_support::run_singlethreaded_test<…>(…) • test_support.rs:227 15 fuchsia::test_singlethreaded<…>(…) • fuchsia/src/lib.rs:195 16 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log() • archivist.rs:524 17 archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::λ(…) • archivist.rs:525 18 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 19 core::ops::function::FnOnce::call_once<…>(…) • library/core/src/ops/function.rs:250 (inline) 20 test::__rust_begin_short_backtrace<…>(…) • library/test/src/lib.rs:625 21 test::run_test_in_spawned_subprocess(…) • library/test/src/lib.rs:753 22 test::test_main_static_abort(…) • library/test/src/lib.rs:199 23 archivist_lib_lib_test::main() • archivist/src/lib.rs:1 24 core::ops::function::FnOnce::call_once<…>(…) • fuchsia-third_party-rust/library/core/src/ops/function.rs:250 25 std::sys::backtrace::__rust_begin_short_backtrace<…>(…) • fuchsia-third_party-rust/library/std/src/sys/backtrace.rs:155 26 std::rt::lang_start::λ() • fuchsia-third_party-rust/library/std/src/rt.rs:159 27 core::ops::function::impls::«impl»::call_once<…>(…) • library/core/src/ops/function.rs:284 (inline) 28 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) 29 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 30 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 31 std::rt::lang_start_internal::λ() • library/std/src/rt.rs:141 (inline) 32 std::panicking::try::do_call<…>(…) • library/std/src/panicking.rs:553 (inline) 33 std::panicking::try<…>() • library/std/src/panicking.rs:517 (inline) 34 std::panic::catch_unwind<…>() • library/std/src/panic.rs:350 (inline) 35 std::rt::lang_start_internal(…) • library/std/src/rt.rs:141 36 std::rt::lang_start<…>(…) • fuchsia-third_party-rust/library/std/src/rt.rs:158 37 $elf(main) + 0x21 38…40 «libc startup» (-r expands)根据上一步的输出，您可能需要深入了解
frame 0：frame 0您应该会看到如下所示的输出：
archivist_lib_lib_test::archivist::tests::can_log_and_retrieve_log::test_entry_point::λ(…) • archivist.rs:547如需查看当前帧中的其他代码行，请使用
list：list您应该会看到如下所示的输出：
542 543 let mut expected = vec!["my msg1".to_owned(), "my msg2".to_owned()]; 544 expected.sort(); 545 546 let mut actual = vec![recv_logs.next().await.unwrap(), recv_logs.next().await.unwrap()]; ▶ 547 actual.sort(); 548 549 assert_eq!(expected, actual); 550 551 // can log after killing log sink proxy 552 log_helper.kill_log_sink(); 553 log_helper.write_log("my msg1"); 554 log_helper.write_log("my msg2"); 555 556 assert_eq!( 557 expected,由于此帧实际上包含一些归档程序代码，因此您可以使用
locals查看此堆栈帧中的本地变量。如需查看当前堆栈帧中的所有局部变量，请使用
locals：locals您应该会看到如下所示的输出：
_task_context = (*)0x5c626904e0 ➔ Context{ waker: (*)0x5c626904c8 local_waker: (*)0x5c626904c8 ext: AssertUnwindSafe<core::task::wake::ExtData>(None(<Value has no data.>)) _marker: PhantomData<fn(&())->&()> _marker2: PhantomData<*mut()> } actual = <Invalid pointer 0x9c187a04e8> directory = <Invalid pointer 0x9c187a0460> expected = <Invalid pointer 0x9c187a04d0> log_helper = <Invalid pointer 0x9c187a0470> log_helper2 = <Invalid pointer 0x9c187a04c0> recv_logs = <Invalid pointer 0x9c187a0468>然后，您可以使用
print查看有关特定变量的更多信息。例如：print _task_context您应该会看到如下所示的输出：
(*)0x5c626904e0 ➔ Context{ waker: (*)0x5c626904c8 local_waker: (*)0x5c626904c8 ext: AssertUnwindSafe<core::task::wake::ExtData>(None(<Value has no data.>)) _marker: PhantomData<fn(&())->&()> _marker2: PhantomData<*mut()> }
您已成功加载并分析了 Rust 代码的小型转储。
C++
如需将迷你转储文件加载到 zxdb，您可以使用
ffx debug core。 例如，如需加载名为cobalt_minidump.dump的小型转储文件，请使用以下命令：ffx debug core cobalt_minidump.dump您应该会看到如下所示的输出：
Opening dump file... Dump loaded successfully. 👉 To get started, try "status" or "help". Attached Process 1 state=Running koid=15650768 name=<_> Loading 15 modules for <_> ...Done. Attached Process 2 state=Running koid=15650768 name=<_> Attaching to previously connected processes: 15650768: <_> Loading 15 modules for <_> Done.加载了迷你转储文件后，您现在可以检查堆栈 针对捕获小型转储时出现的所有线程。
列出堆栈帧：
frame您应该会看到如下所示的输出：
▶ 0…4 «Waiting for event in async::Loop::Run()» (-r expands) 5 main(…) • cobalt_main.cc:349 6…8 «libc startup» (-r expands)您现在可以使用快捷方式在所有线程中快速执行操作：
列出每个线程的帧：
thread * frame您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=19601 name="" ▶ 0…4 «Waiting for event in async::Loop::Run()» (-r expands) 5 main(…) • cobalt_main.cc:349 6…8 «libc startup» (-r expands) Thread 2 state="Core Dump" koid=26944 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 2 __timedwait_assign_owner(…) • __timedwait.c:23 3 __timedwait(…) • threads_impl.h:322 (inline) 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 5 std::__2::__libcpp_condvar_timedwait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:127 (inline) 6 std::__2::condition_variable::__do_timed_wait(…) • condition_variable.cpp:54 7 std::__2::condition_variable::wait_for<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:196 8 std::__2::condition_variable::__do_timed_wait<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:235 9 std::__2::condition_variable::wait_until<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:161 10 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:240 11 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:247 12 std::__2::condition_variable_any::wait_for<…>(…) • condition_variable:260 13 cobalt::local_aggregation::DelayedLocalAggregateStorage::Run(…) • delayed_local_aggregate_storage.cc:200 14 λ(…) • delayed_local_aggregate_storage.cc:45 15 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 16 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 17 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 18…19 «pthread startup» (-r expands) Thread 3 state="Core Dump" koid=26975 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 2 __timedwait_assign_owner(…) • __timedwait.c:23 3 __timedwait(…) • threads_impl.h:322 (inline) 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 5 std::__2::__libcpp_condvar_wait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:122 (inline) 6 std::__2::condition_variable::wait(…) • condition_variable.cpp:30 7 std::__2::condition_variable_any::wait<…>(…) • condition_variable:225 8 std::__2::condition_variable_any::wait<…>(…) • condition_variable:231 9 cobalt::uploader::ShippingManager::Run(…) • shipping_manager.cc:217 10 λ(…) • shipping_manager.cc:76 11 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 12 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 13 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 14…15 «pthread startup» (-r expands) Thread 4 state="Core Dump" koid=26983 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 2 __timedwait_assign_owner(…) • __timedwait.c:23 3 __timedwait(…) • threads_impl.h:322 (inline) 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 5 std::__2::__libcpp_condvar_timedwait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:127 (inline) 6 std::__2::condition_variable::__do_timed_wait(…) • condition_variable.cpp:54 7 std::__2::condition_variable::wait_for<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:196 8 std::__2::condition_variable::__do_timed_wait<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:235 9 std::__2::condition_variable::wait_until<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:161 10 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:240 11 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:247 12 cobalt::local_aggregation::ObservationGenerator::Run(…) • observation_generator.cc:92 13 λ(…) • observation_generator.cc:65 14 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 15 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 16 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 17…18 «pthread startup» (-r expands)如需列出每个线程的帧，但包含更多详细信息，您可以将
thread与backtrace动词组合使用：thread * backtrace此命令可帮助您查看每个堆栈帧的局部变量。请注意，minidump 中仅捕获堆栈内存，以缩短捕获时间并减小文件大小。指向堆变量的指针通常不 解析为任何有用的内容
<Invalid pointer 0x285f3fd5a18>。您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=19601 name="" ▶ 0…4 «Waiting for event in async::Loop::Run()» (-r expands) 5 main(…) • cobalt_main.cc:349 argc = 2 argv = (*)0x26866821fc0 6…8 «libc startup» (-r expands) Thread 2 state="Core Dump" koid=26944 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 value_ptr = (*)0x285f3fd5904 current_value = 2 new_futex_owner = 0 deadline = 612921722073211 2 __timedwait_assign_owner(…) • __timedwait.c:23 futex = <Register rdi not available.> val = <Register rsi not available.> clk = <Register rdx not available.> at = <Register rcx not available.> new_owner = <Register r8 not available.> 3 __timedwait(…) • threads_impl.h:322 (inline) futex = (*)0x285f3fd5904 val = 2 clk = 0 at = (*)0x285f3fd5918 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 c = (*)0x370ff24ae20 m = (*)0x3707f2b76c8 ts = (*)0x285f3fd5918 5 std::__2::__libcpp_condvar_timedwait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:127 (inline) __cv = <Register rdi not available.> __m = <Register rsi not available.> __ts = <Optimized out> 6 std::__2::condition_variable::__do_timed_wait(…) • condition_variable.cpp:54 this = <Register rdi not available.> lk = <Register rsi not available.> tp = <Register rdx not available.> 7 std::__2::condition_variable::wait_for<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:196 this = (*)0x370ff24ae20 __lk = <Invalid pointer 0x285f3fd5a18> __d = <Invalid pointer 0x285f3fd59a8> 8 std::__2::condition_variable::__do_timed_wait<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:235 this = (*)0x370ff24ae20 __lk = <Invalid pointer 0x285f3fd5a18> __tp = <Invalid pointer 0x285f3fd59b0> 9 std::__2::condition_variable::wait_until<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:161 this = (*)0x370ff24ae20 __lk = <Invalid pointer 0x285f3fd5a18> __t = <Invalid pointer 0x285f3fd5a60> 10 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:240 this = (*)0x370ff24ae20 __lock = <Invalid pointer 0x285f3fd5ab0> __t = <Invalid pointer 0x285f3fd5a60> 11 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:247 this = (*)0x370ff24ae20 __lock = <Invalid pointer 0x285f3fd5ab0> __t = <Invalid pointer 0x285f3fd5a60> __pred = <Invalid pointer 0x285f3fd5a40> 12 std::__2::condition_variable_any::wait_for<…>(…) • condition_variable:260 this = (*)0x370ff24ae20 __lock = <Invalid pointer 0x285f3fd5ab0> __d = <Invalid pointer 0x370ff24ae00> __pred = {locked_state = <Invalid pointer 0x285f3fd5ab0>} 13 cobalt::local_aggregation::DelayedLocalAggregateStorage::Run(…) • delayed_local_aggregate_storage.cc:200 this = (*)0x370ff24acf0 14 λ(…) • delayed_local_aggregate_storage.cc:45 this = (*)0x36bff27b228 15 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 __f = <Invalid pointer 0x36bff27b228> 16 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 __t = <Invalid pointer 0x36bff27b220> {} 17 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 __vp = (*)0x36bff27b220 18…19 «pthread startup» (-r expands) Thread 3 state="Core Dump" koid=26975 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 value_ptr = (*)0x23b6ad77434 current_value = 2 new_futex_owner = 0 deadline = 9223372036854775807 2 __timedwait_assign_owner(…) • __timedwait.c:23 futex = <Register rdi not available.> val = <Register rsi not available.> clk = <Register rdx not available.> at = <Register rcx not available.> new_owner = <Register r8 not available.> 3 __timedwait(…) • threads_impl.h:322 (inline) futex = (*)0x23b6ad77434 val = 2 clk = 0 at = (*)0x0 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 c = (*)0x3673f24a610 m = (*)0x3707f2b7998 ts = (*)0x0 5 std::__2::__libcpp_condvar_wait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:122 (inline) __cv = <Register rdi not available.> __m = <Register rsi not available.> 6 std::__2::condition_variable::wait(…) • condition_variable.cpp:30 this = <Register rdi not available.> lk = <Register rsi not available.> 7 std::__2::condition_variable_any::wait<…>(…) • condition_variable:225 this = (*)0x3673f24a610 __lock = <Invalid pointer 0x23b6ad77608> 8 std::__2::condition_variable_any::wait<…>(…) • condition_variable:231 this = (*)0x3673f24a610 __lock = <Invalid pointer 0x23b6ad77608> __pred = <Invalid pointer 0x23b6ad77480> 9 cobalt::uploader::ShippingManager::Run(…) • shipping_manager.cc:217 this = (*)0x3673f24a530 10 λ(…) • shipping_manager.cc:76 this = (*)0x36bff27a7a8 11 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 __f = <Invalid pointer 0x36bff27a7a8> 12 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 __t = <Invalid pointer 0x36bff27a7a0> {} 13 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 __vp = (*)0x36bff27a7a0 14…15 «pthread startup» (-r expands) Thread 4 state="Core Dump" koid=26983 name="" ▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 value_ptr = (*)0x149c84b2bc4 current_value = 2 new_futex_owner = 0 deadline = 615784347537787 2 __timedwait_assign_owner(…) • __timedwait.c:23 futex = <Register rdi not available.> val = <Register rsi not available.> clk = <Register rdx not available.> at = <Register rcx not available.> new_owner = <Register r8 not available.> 3 __timedwait(…) • threads_impl.h:322 (inline) futex = (*)0x149c84b2bc4 val = 2 clk = 0 at = (*)0x149c84b2bd8 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 c = (*)0x3673f24b128 m = (*)0x3707f2b6548 ts = (*)0x149c84b2bd8 5 std::__2::__libcpp_condvar_timedwait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:127 (inline) __cv = <Register rdi not available.> __m = <Register rsi not available.> __ts = <Optimized out> 6 std::__2::condition_variable::__do_timed_wait(…) • condition_variable.cpp:54 this = <Register rdi not available.> lk = <Register rsi not available.> tp = <Register rdx not available.> 7 std::__2::condition_variable::wait_for<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:196 this = (*)0x3673f24b128 __lk = <Invalid pointer 0x149c84b2cd8> __d = <Invalid pointer 0x149c84b2c68> 8 std::__2::condition_variable::__do_timed_wait<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:235 this = (*)0x3673f24b128 __lk = <Invalid pointer 0x149c84b2cd8> __tp = <Invalid pointer 0x149c84b2c70> 9 std::__2::condition_variable::wait_until<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:161 this = (*)0x3673f24b128 __lk = <Invalid pointer 0x149c84b2cd8> __t = <Invalid pointer 0x3673f24b0d8> 10 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:240 this = (*)0x3673f24b128 __lock = <Invalid pointer 0x149c84b2d20> __t = <Invalid pointer 0x3673f24b0d8> 11 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:247 this = (*)0x3673f24b128 __lock = <Invalid pointer 0x149c84b2d20> __t = <Invalid pointer 0x3673f24b0d8> __pred = <Invalid pointer 0x149c84b2d00> 12 cobalt::local_aggregation::ObservationGenerator::Run(…) • observation_generator.cc:92 this = (*)0x3673f24b0a0 clock = (*)0x36bff27aaa0 13 λ(…) • observation_generator.cc:65 this = (*)0x36bff24cf68 14 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 __f = <Invalid pointer 0x36bff24cf68> 15 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 __t = <Invalid pointer 0x36bff24cf60> {} 16 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 __vp = (*)0x36bff24cf60 17…18 «pthread startup» (-r expands)列出当前线程：
thread您应该会看到如下所示的输出：
# state koid name ▶ 1 Core Dump 19601 2 Core Dump 26944 3 Core Dump 26975 4 Core Dump 26983列出特定会话。例如
thread 2：thread 2您应该会看到如下所示的输出：
Thread 2 state="Core Dump" koid=26944 name=""然后，您可以使用
frame从thread 2查看此特定堆栈帧：frame您应该会看到如下所示的输出：
▶ 0 $elf(CODE_SYSCALL_zx_futex_wait) + 0xa • syscalls.inc:210 1 _zx_futex_wait(…) • syscalls.inc:210 2 __timedwait_assign_owner(…) • __timedwait.c:23 3 __timedwait(…) • threads_impl.h:322 (inline) 4 pthread_cond_timedwait(…) • pthread_cond_timedwait.c:78 5 std::__2::__libcpp_condvar_timedwait(…) • stage2-bins/include/c++/v1/__thread/support/pthread.h:127 (inline) 6 std::__2::condition_variable::__do_timed_wait(…) • condition_variable.cpp:54 7 std::__2::condition_variable::wait_for<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:196 8 std::__2::condition_variable::__do_timed_wait<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:235 9 std::__2::condition_variable::wait_until<…>(…) • linux-x64/include/c++/v1/__condition_variable/condition_variable.h:161 10 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:240 11 std::__2::condition_variable_any::wait_until<…>(…) • condition_variable:247 12 std::__2::condition_variable_any::wait_for<…>(…) • condition_variable:260 13 cobalt::local_aggregation::DelayedLocalAggregateStorage::Run(…) • delayed_local_aggregate_storage.cc:200 14 λ(…) • delayed_local_aggregate_storage.cc:45 15 std::__2::__invoke<…>(…) • linux-x64/include/c++/v1/__type_traits/invoke.h:150 16 std::__2::__thread_execute<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:192 17 std::__2::__thread_proxy<…>(…) • linux-x64/include/c++/v1/__thread/thread.h:201 18…19 «pthread startup» (-r expands)列出另一个特定会话。例如
thread 1：thread 1您应该会看到如下所示的输出：
Thread 1 state="Core Dump" koid=19601 name=""然后，您可以使用
frame从thread 1查看此特定堆栈帧：frame您应该会看到如下所示的输出：
▶ 0…4 «Waiting for event in async::Loop::Run()» (-r expands) 5 main(…) • cobalt_main.cc:349 6…8 «libc startup» (-r expands)根据上一步的输出，您可能需要深入了解
frame 5：frame 5您应该会看到如下所示的输出：
main(…) • cobalt_main.cc:349如需查看当前帧中的其他代码行，请使用
list：list您应该会看到如下所示的输出：
344 345 if (!app.ok()) { 346 FX_LOGS(FATAL) << "Failed to construct the cobalt app: " << app.status(); 347 } 348 inspector.Health().Ok(); ▶ 349 loop.Run(); 350 FX_LOGS(INFO) << "Cobalt will now shut down."; 351 return 0; 352 }由于此帧实际上包含一些代码，因此您可以使用
locals查看此堆栈帧中的本地变量。如需查看当前堆栈帧中的所有局部变量，请使用
locals：locals您应该会看到如下所示的输出：
argc = 2 argv = (*)0x26866821fc0 command_line = <Invalid pointer 0x26866821418> context = <Invalid pointer 0x26866821100> event_aggregator_backfill_days = 2 flag_value = <Invalid pointer 0x268668211d8> initial_interval = <Invalid pointer 0x26866821138> inspector = <Invalid pointer 0x268668212f0> loop = <Invalid pointer 0x26866821108> max_bytes_per_observation_store = 215040 min_interval = <Invalid pointer 0x26866821118> require_lifecycle_service = true schedule_interval = <Invalid pointer 0x26866821140> start_event_aggregator_worker = true status = 0 (ZX_OK) storage_quotas = { per_project_reserved_bytes = 1024 total_capacity_bytes = 731136 } test_dont_backfill_empty_reports = false upload_jitter = 0.2 upload_schedule = { target_interval = {__rep_ = 3600} min_interval = {__rep_ = 10} initial_interval = {__rep_ = 60} jitter = 0.2 } use_fake_clock = false use_memory_observation_store = false然后，您可以使用
print查看有关特定变量的更多信息。例如：print upload_schedule您应该会看到如下所示的输出：
{ target_interval = {__rep_ = 3600} min_interval = {__rep_ = 10} initial_interval = {__rep_ = 60} jitter = 0.2 }
您已成功加载并分析了 C++ 代码的小型转储。