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agent: Avoid agent panic when reading empty stats

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This was seen in an issue report, where we'd try to unwrap a None value,
leading to a panic.

Fixes: #4077
Related: #4043

Full backtrace:
```
"thread 'tokio-runtime-worker' panicked at 'called `Option::unwrap()` on a `None` value', rustjail/src/cgroups/fs/mod.rs:593:31"
"stack backtrace:"
"   0:     0x7f0390edcc3a - std::backtrace_rs::backtrace::libunwind::trace::hd5eff4de16dbdd15"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5"
"   1:     0x7f0390edcc3a - std::backtrace_rs::backtrace::trace_unsynchronized::h04a775b4c6ab90d6"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5"
"   2:     0x7f0390edcc3a - std::sys_common::backtrace::_print_fmt::h3253c3db9f17d826"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys_common/backtrace.rs:67:5"
"   3:     0x7f0390edcc3a - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h02bfc712fc868664"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys_common/backtrace.rs:46:22"
"   4:     0x7f0390a91fbc - core::fmt::write::hfd5090d1132106d8"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/core/src/fmt/mod.rs:1149:17"
"   5:     0x7f0390edb804 - std::io::Write::write_fmt::h34acb699c6d6f5a9"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/io/mod.rs:1697:15"
"   6:     0x7f0390edbee0 - std::sys_common::backtrace::_print::hfca761479e3d91ed"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys_common/backtrace.rs:49:5"
"   7:     0x7f0390edbee0 - std::sys_common::backtrace::print::hf666af0b87d2b5ba"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys_common/backtrace.rs:36:9"
"   8:     0x7f0390edbee0 - std::panicking::default_hook::{{closure}}::hb4617bd1d4a09097"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/panicking.rs:211:50"
"   9:     0x7f0390edb2da - std::panicking::default_hook::h84f684d9eff1eede"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/panicking.rs:228:9"
"  10:     0x7f0390edb2da - std::panicking::rust_panic_with_hook::h8e784f5c39f46346"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/panicking.rs:606:17"
"  11:     0x7f0390f0c416 - std::panicking::begin_panic_handler::{{closure}}::hef496869aa926670"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/panicking.rs:500:13"
"  12:     0x7f0390f0c3b6 - std::sys_common::backtrace::__rust_end_short_backtrace::h8e9b039b8ed3e70f"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys_common/backtrace.rs:139:18"
"  13:     0x7f0390f0c372 - rust_begin_unwind"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/panicking.rs:498:5"
"  14:     0x7f03909062c0 - core::panicking::panic_fmt::h568976b83a33ae59"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/core/src/panicking.rs:107:14"
"  15:     0x7f039090641c - core::panicking::panic::he2e71cfa6548cc2c"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/core/src/panicking.rs:48:5"
"  16:     0x7f0390eb443f - <rustjail::cgroups::fs::Manager as rustjail::cgroups::Manager>::get_stats::h85031fc1c59c53d9"
"  17:     0x7f03909c0138 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hfa6e6cd7516f8d11"
"  18:     0x7f0390d697e5 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hffbaa534cfa97d44"
"  19:     0x7f039099c0b3 - <core::future::from_generator::GenFuture<T> as core::future::future::Future>::poll::hae3ab083a06d0b4b"
"  20:     0x7f0390af9e1e - std::panic::catch_unwind::h1fdd25c8ebba32e1"
"  21:     0x7f0390b7c4e6 - tokio::runtime::task::raw::poll::hd3ebbd0717dac808"
"  22:     0x7f0390f49f3f - tokio::runtime::thread_pool::worker::Context::run_task::hfdd63cd1e0b17abf"
"  23:     0x7f0390f3a599 - tokio::runtime::task::raw::poll::h62954f6369b1d210"
"  24:     0x7f0390f37863 - std::sys_common::backtrace::__rust_begin_short_backtrace::h1c58f232c078bfe9"
"  25:     0x7f0390f4f3dd - core::ops::function::FnOnce::call_once{{vtable.shim}}::h2d329a84c0feed57"
"  26:     0x7f0390f0e535 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h137e5243c6233a3b"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/alloc/src/boxed.rs:1694:9"
"  27:     0x7f0390f0e535 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7331c46863d912b7"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/alloc/src/boxed.rs:1694:9"
"  28:     0x7f0390f0e535 - std::sys::unix:🧵:Thread:🆕:thread_start::h1fb20b966cb927ab"
"                               at /rustc/db9d1b20bba1968c1ec1fc49616d4742c1725b4b/library/std/src/sys/unix/thread.rs:106:17"
```

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
(cherry picked from commit 78f30c33c6)
This commit is contained in:
Fabiano Fidêncio 2022-04-12 10:46:10 +02:00
parent 0ad6f05dee
commit 6b41754018
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/agent/rustjail/src/cgroups/fs/mod.rs
View File

@ -590,9 +590,9 @@ fn get_cpuacct_stats(cg: &cgroups::Cgroup) -> SingularPtrField<CpuUsage> {
let h = lines_to_map(&cpuacct.stat);
let usage_in_usermode =
(((*h.get("user").unwrap() * NANO_PER_SECOND) as f64) / *CLOCK_TICKS) as u64;
(((*h.get("user").unwrap_or(&0) * NANO_PER_SECOND) as f64) / *CLOCK_TICKS) as u64;
let usage_in_kernelmode =
(((*h.get("system").unwrap() * NANO_PER_SECOND) as f64) / *CLOCK_TICKS) as u64;
(((*h.get("system").unwrap_or(&0) * NANO_PER_SECOND) as f64) / *CLOCK_TICKS) as u64;
let total_usage = cpuacct.usage;
@ -623,9 +623,9 @@ fn get_cpuacct_stats(cg: &cgroups::Cgroup) -> SingularPtrField<CpuUsage> {
let cpu_controller: &CpuController = get_controller_or_return_singular_none!(cg);
let stat = cpu_controller.cpu().stat;
let h = lines_to_map(&stat);
let usage_in_usermode = *h.get("user_usec").unwrap();
let usage_in_kernelmode = *h.get("system_usec").unwrap();
let total_usage = *h.get("usage_usec").unwrap();
let usage_in_usermode = *h.get("user_usec").unwrap_or(&0);
let usage_in_kernelmode = *h.get("system_usec").unwrap_or(&0);
let total_usage = *h.get("usage_usec").unwrap_or(&0);
let percpu_usage = vec![];
SingularPtrField::some(CpuUsage {