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Add Python 3.12 Support (#2553)
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- Implement an initial mechanism to read the thread state from TLS
- Fetch libc offsets dynamically
- Improve libc detection
- Fix musl issues
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@kakkoyun
kakkoyun authored Feb 26, 2024
2 parents 88b0d5b + 7af6417 commit 69f4599
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Showing 21 changed files with 1,394 additions and 629 deletions.
2 changes: 0 additions & 2 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,6 @@ VMLINUX := vmlinux.h
BPF_ROOT := bpf
BPF_SRC := $(BPF_ROOT)/unwinders/native.bpf.c
OUT_BPF_DIR := pkg/profiler/cpu/bpf/programs/objects/$(ARCH)
# TODO(kakkoyun): DRY.
OUT_BPF := $(OUT_BPF_DIR)/native.bpf.o
OUT_RBPERF := $(OUT_BPF_DIR)/rbperf.bpf.o
OUT_PYPERF := $(OUT_BPF_DIR)/pyperf.bpf.o
Expand Down Expand Up @@ -163,7 +162,6 @@ ifndef DOCKER
$(OUT_BPF): $(BPF_SRC) libbpf | $(OUT_DIR)
mkdir -p $(OUT_BPF_DIR) $(OUT_BPF_CONTAINED_DIR)
$(MAKE) -C bpf build
# TODO(kakkoyun): DRY.
cp bpf/out/$(ARCH)/native.bpf.o $(OUT_BPF)
cp bpf/out/$(ARCH)/rbperf.bpf.o $(OUT_RBPERF)
cp bpf/out/$(ARCH)/pyperf.bpf.o $(OUT_PYPERF)
Expand Down
2 changes: 0 additions & 2 deletions bpf/Makefile
View file
Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,6 @@ OUT_DIR ?= ../dist
OUT_BPF_BASE_DIR := out
OUT_BPF_DIR := $(OUT_BPF_BASE_DIR)/$(ARCH)
OUT_BPF := $(OUT_BPF_DIR)/native.bpf.o
# TODO(kakkoyun): DRY.
OUT_RBPERF := $(OUT_BPF_DIR)/rbperf.bpf.o
OUT_PYPERF := $(OUT_BPF_DIR)/pyperf.bpf.o
OUT_PID_NAMESPACE_DETECTOR := $(OUT_BPF_DIR)/pid_namespace.bpf.o
Expand All @@ -24,7 +23,6 @@ BPF_BUNDLE := $(OUT_DIR)/parca-agent.bpf.tar.gz
LIBBPF_HEADERS := $(OUT_DIR)/libbpf/$(ARCH)/usr/include

VMLINUX_INCLUDE_PATH := $(SHORT_ARCH)
# TODO(kakkoyun): DRY.
BPF_SRC := unwinders/native.bpf.c
RBPERF_SRC := unwinders/rbperf.bpf.c
PYPERF_SRC := unwinders/pyperf.bpf.c
Expand Down
149 changes: 116 additions & 33 deletions bpf/unwinders/pyperf.bpf.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,20 @@ struct {
__type(value, PythonVersionOffsets);
} version_specific_offsets SEC(".maps");

struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 12); // arbitrary
__type(key, u32);
__type(value, LibcOffsets);
} musl_offsets SEC(".maps");

struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, 12); // arbitrary
__type(key, u32);
__type(value, LibcOffsets);
} glibc_offsets SEC(".maps");

struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__uint(max_entries, 1);
Expand Down Expand Up @@ -80,7 +94,64 @@ struct {
} \
})

static __always_inline long unsigned int read_tls_base(struct task_struct *task) {
// tls_read reads from the TLS associated with the provided key depending on the libc implementation.
static inline __attribute__((__always_inline__)) int tls_read(void *tls_base, InterpreterInfo *interpreter_info, void **out) {
LibcOffsets *libc_offsets;
void *tls_addr = NULL;
int key = interpreter_info->tls_key;
switch (interpreter_info->libc_implementation) {
case LIBC_IMPLEMENTATION_GLIBC:
// Read the offset from the corresponding map.
libc_offsets = bpf_map_lookup_elem(&glibc_offsets, &interpreter_info->libc_offset_index);
if (libc_offsets == NULL) {
LOG("[error] libc_offsets for glibc is NULL");
return -1;
}
#if __TARGET_ARCH_x86

tls_addr = tls_base + libc_offsets->pthread_block + (key * libc_offsets->pthread_key_data_size) + libc_offsets->pthread_key_data;
#elif __TARGET_ARCH_arm64
tls_addr =
tls_base - libc_offsets->pthread_size + libc_offsets->pthread_block + (key * libc_offsets->pthread_key_data_size) + libc_offsets->pthread_key_data;
#else
#error "Unsupported platform"
#endif
break;
case LIBC_IMPLEMENTATION_MUSL:
// Read the offset from the corresponding map.
libc_offsets = bpf_map_lookup_elem(&musl_offsets, &interpreter_info->libc_offset_index);
if (libc_offsets == NULL) {
LOG("[error] libc_offsets for musl is NULL");
return -1;
}
#if __TARGET_ARCH_x86
if (bpf_probe_read_user(&tls_addr, sizeof(tls_addr), tls_base + libc_offsets->pthread_block)) {
return -1;
}
tls_addr = tls_addr + key * libc_offsets->pthread_key_data_size;
#elif __TARGET_ARCH_arm64
if (bpf_probe_read_user(&tls_addr, sizeof(tls_addr), tls_base - libc_offsets->pthread_size + libc_offsets->pthread_block)) {
return -1;
}
tls_addr = key * libc_offsets->pthread_key_data_size;
#else
#error "Unsupported platform"
#endif
break;
default:
LOG("[error] unknown libc_implementation %d", interpreter_info->libc_implementation);
return -1;
}

LOG("tls_read key %d from address 0x%lx", key, (unsigned long)tls_addr);
if (bpf_probe_read(out, sizeof(*out), tls_addr)) {
LOG("failed to read 0x%lx from TLS", (unsigned long)tls_addr);
return -1;
}
return 0;
}

static inline __attribute__((__always_inline__)) long unsigned int read_tls_base(struct task_struct *task) {
long unsigned int tls_base;
// This changes depending on arch and kernel version.
// task->thread.fs, task->thread.uw.tp_value, etc.
Expand Down Expand Up @@ -108,7 +179,6 @@ int unwind_python_stack(struct bpf_perf_event_data *ctx) {
return 1;
}

// TODO(kakkoyun) : DRY.
u64 pid_tgid = bpf_get_current_pid_tgid();
pid_t pid = pid_tgid >> 32;
pid_t tid = pid_tgid;
Expand All @@ -122,11 +192,6 @@ int unwind_python_stack(struct bpf_perf_event_data *ctx) {
return 0;
}

if (interpreter_info->thread_state_addr == 0) {
LOG("[error] interpreter_info.thread_state_addr was NULL");
return 0;
}

LOG("[start]");
LOG("[event] pid=%d tid=%d", pid, tid);

Expand Down Expand Up @@ -157,50 +222,68 @@ int unwind_python_stack(struct bpf_perf_event_data *ctx) {

// Fetch thread state.

// GDB: ((PyThreadState *)_PyRuntime.gilstate.tstate_current)
LOG("interpreter_info->thread_state_addr 0x%llx", interpreter_info->thread_state_addr);
int err = bpf_probe_read_user(&state->thread_state, sizeof(state->thread_state), (void *)(long)interpreter_info->thread_state_addr);
if (err != 0) {
LOG("[error] failed to read interpreter_info->thread_state_addr with %d", err);
goto submit_without_unwinding;
}
if (state->thread_state == 0) {
LOG("[error] thread_state was NULL");
goto submit_without_unwinding;
if (interpreter_info->thread_state_addr != 0) {
LOG("interpreter_info->thread_state_addr 0x%llx", interpreter_info->thread_state_addr);
int err = bpf_probe_read_user(&state->thread_state, sizeof(state->thread_state), (void *)(long)interpreter_info->thread_state_addr);
if (err != 0) {
LOG("[error] failed to read interpreter_info->thread_state_addr with %d", err);
goto submit_without_unwinding;
}
LOG("thread_state 0x%llx", state->thread_state);
}
LOG("thread_state 0x%llx", state->thread_state);

struct task_struct *task = (struct task_struct *)bpf_get_current_task();
long unsigned int tls_base = read_tls_base(task);
LOG("tls_base 0x%llx", (void *)tls_base);
if (interpreter_info->use_tls) {
struct task_struct *task = (struct task_struct *)bpf_get_current_task();
long unsigned int tls_base = read_tls_base(task);
LOG("tls_base 0x%llx", (void *)tls_base);

// TODO(kakkoyun): Read TLS key in here instead of user-space.
// int key;
// if (bpf_probe_read(&key, sizeof(key), interpreter_info->tls_key_addr)) {
// LOG("[error] failed to read TLS key from 0x%lx", (unsigned long)interpreter_info->tls_key_addr);
// goto submit_without_unwinding;
// }
if (tls_read((void *)tls_base, interpreter_info, &state->thread_state)) {
LOG("[error] failed to read thread state from TLS 0x%lx", (unsigned long)interpreter_info->tls_key);
goto submit_without_unwinding;
}

if (state->thread_state == 0) {
LOG("[error] thread_state was NULL");
goto submit_without_unwinding;
}
LOG("thread_state 0x%llx", state->thread_state);
}

GET_OFFSETS();

// Fetch the thread id.

LOG("offsets->py_thread_state.thread_id %d", offsets->py_thread_state.thread_id);
pthread_t pthread_id;
bpf_probe_read_user(&pthread_id, sizeof(pthread_id), state->thread_state + offsets->py_thread_state.thread_id);
if (bpf_probe_read_user(&pthread_id, sizeof(pthread_id), state->thread_state + offsets->py_thread_state.thread_id)) {
LOG("[error] failed to read thread_state->thread_id");
goto submit_without_unwinding;
}

LOG("pthread_id %lu", pthread_id);
// 0x10 = offsetof(tcbhead_t, self) for glibc x86.
// pthread_t current_pthread_id;
// bpf_probe_read_user(&current_pthread_id, sizeof(current_pthread_id), (void *)(tls_base + 0x10));
// LOG("current_pthread_id %lu", current_pthread_id);
// if (pthread_id != current_pthread_id) {
// LOG("[error] pthread_id %lu != current_pthread_id %lu", pthread_id, current_pthread_id);
// goto submit_without_unwinding;
// }
// state->current_pthread = current_pthread_id;
state->current_pthread = pthread_id;

// Get pointer to top frame from PyThreadState.

if (offsets->py_thread_state.frame > -1) {
LOG("offsets->py_thread_state.frame %d", offsets->py_thread_state.frame);
bpf_probe_read_user(&state->frame_ptr, sizeof(void *), state->thread_state + offsets->py_thread_state.frame);
if (bpf_probe_read_user(&state->frame_ptr, sizeof(void *), state->thread_state + offsets->py_thread_state.frame)) {
LOG("[error] failed to read thread_state->frame");
goto submit_without_unwinding;
}
} else {
LOG("offsets->py_thread_state.cframe %d", offsets->py_thread_state.cframe);
void *cframe;
bpf_probe_read_user(&cframe, sizeof(cframe), (void *)(state->thread_state + offsets->py_thread_state.cframe));
if (bpf_probe_read_user(&cframe, sizeof(cframe), (void *)(state->thread_state + offsets->py_thread_state.cframe))) {
LOG("[error] failed to read thread_state->cframe");
goto submit_without_unwinding;
}
if (cframe == 0) {
LOG("[error] cframe was NULL");
goto submit_without_unwinding;
Expand Down
18 changes: 18 additions & 0 deletions bpf/unwinders/pyperf.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -12,11 +12,22 @@

#define PYPERF_STACK_WALKING_PROGRAM_IDX 0

enum libc_implementation {
LIBC_IMPLEMENTATION_GLIBC = 0,
LIBC_IMPLEMENTATION_MUSL = 1,
};

typedef struct {
// u64 start_time;
// u64 interpreter_addr;
u64 thread_state_addr;
u64 tls_key;
u32 py_version_offset_index;
u32 libc_offset_index;
enum libc_implementation libc_implementation;

_Bool use_tls;
// TODO(kakkoyun): bool use_runtime_debug_offsets;
} InterpreterInfo;

enum python_stack_status {
Expand Down Expand Up @@ -127,3 +138,10 @@ typedef struct {
PyTupleObject py_tuple_object;
PyTypeObject py_type_object;
} PythonVersionOffsets;

typedef struct {
s64 pthread_size;
s64 pthread_block;
s64 pthread_key_data;
s64 pthread_key_data_size;
} LibcOffsets;
10 changes: 5 additions & 5 deletions go.mod
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,12 +24,12 @@ require (
github.com/google/pprof v0.0.0-20240207164012-fb44976bdcd5
github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus v1.0.0
github.com/grpc-ecosystem/go-grpc-middleware/v2 v2.0.1
github.com/klauspost/compress v1.17.6
github.com/klauspost/compress v1.17.7
github.com/minio/highwayhash v1.0.2
github.com/oklog/run v1.1.0
github.com/opencontainers/runtime-spec v1.2.0
github.com/parca-dev/parca v0.20.0
github.com/parca-dev/runtime-data v0.0.0-20240221144835-838a856ad496
github.com/parca-dev/runtime-data v0.0.0-20240225202746-241008d5f5c3
github.com/planetscale/vtprotobuf v0.6.0
github.com/prometheus/client_golang v1.18.0
github.com/prometheus/common v0.47.0
Expand Down Expand Up @@ -201,11 +201,11 @@ require (
go.opencensus.io v0.24.0 // indirect
go.opentelemetry.io/otel/metric v1.23.1 // indirect
go.opentelemetry.io/proto/otlp v1.1.0 // indirect
golang.org/x/crypto v0.18.0 // indirect
golang.org/x/crypto v0.19.0 // indirect
golang.org/x/mod v0.14.0 // indirect
golang.org/x/net v0.20.0 // indirect
golang.org/x/net v0.21.0 // indirect
golang.org/x/oauth2 v0.16.0 // indirect
golang.org/x/term v0.16.0 // indirect
golang.org/x/term v0.17.0 // indirect
golang.org/x/text v0.14.0 // indirect
golang.org/x/time v0.5.0 // indirect
golang.org/x/tools v0.17.0 // indirect
Expand Down
20 changes: 10 additions & 10 deletions go.sum
View file
Original file line number Diff line number Diff line change
Expand Up @@ -386,8 +386,8 @@ github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7V
github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvWXihfKN4Q=
github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/klauspost/compress v1.17.6 h1:60eq2E/jlfwQXtvZEeBUYADs+BwKBWURIY+Gj2eRGjI=
github.com/klauspost/compress v1.17.6/go.mod h1:/dCuZOvVtNoHsyb+cuJD3itjs3NbnF6KH9zAO4BDxPM=
github.com/klauspost/compress v1.17.7 h1:ehO88t2UGzQK66LMdE8tibEd1ErmzZjNEqWkjLAKQQg=
github.com/klauspost/compress v1.17.7/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
github.com/klauspost/cpuid/v2 v2.2.6 h1:ndNyv040zDGIDh8thGkXYjnFtiN02M1PVVF+JE/48xc=
github.com/klauspost/cpuid/v2 v2.2.6/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
Expand Down Expand Up @@ -495,8 +495,8 @@ github.com/oracle/oci-go-sdk/v65 v65.53.0 h1:/h+rzaRw7W1eSTeDLhSMTRnyXg1oj5NTPeB
github.com/oracle/oci-go-sdk/v65 v65.53.0/go.mod h1:IBEV9l1qBzUpo7zgGaRUhbB05BVfcDGYRFBCPlTcPp0=
github.com/parca-dev/parca v0.20.0 h1:G/TdZLbZEArZzd86rI2RqMpUtz0verlvO3+NDP/d0m0=
github.com/parca-dev/parca v0.20.0/go.mod h1:dKRKjo1MK83iEUygyINUYTAriHICGYejD4EWm5MGT+0=
github.com/parca-dev/runtime-data v0.0.0-20240221144835-838a856ad496 h1:sTUSBmbMriumcql8S8UwHtfpzYO2GfaivNEs9eY0Ty4=
github.com/parca-dev/runtime-data v0.0.0-20240221144835-838a856ad496/go.mod h1:NRpa9nozMNUeyw6p6KeuSx+leWBMoJJE7+mN7XUNdpA=
github.com/parca-dev/runtime-data v0.0.0-20240225202746-241008d5f5c3 h1:hlxBPG8wcI0fd2RLJHKcPIFO36k+9mEMpYb3e8NFbSg=
github.com/parca-dev/runtime-data v0.0.0-20240225202746-241008d5f5c3/go.mod h1:zSTEFju13hAb35sGVtDwWXXHhRPoVQjDnFEpltj6du4=
github.com/parquet-go/parquet-go v0.19.0 h1:xtHOBIE0/8CRhmf06V1GJ7q3qARY2/kXiSweFlscwUQ=
github.com/parquet-go/parquet-go v0.19.0/go.mod h1:6pu/Ca02WRyWyF6jbY1KceESGBZMsRMSijjLbajXaG8=
github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
Expand Down Expand Up @@ -683,8 +683,8 @@ golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8U
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
golang.org/x/crypto v0.18.0 h1:PGVlW0xEltQnzFZ55hkuX5+KLyrMYhHld1YHO4AKcdc=
golang.org/x/crypto v0.18.0/go.mod h1:R0j02AL6hcrfOiy9T4ZYp/rcWeMxM3L6QYxlOuEG1mg=
golang.org/x/crypto v0.19.0 h1:ENy+Az/9Y1vSrlrvBSyna3PITt4tiZLf7sgCjZBX7Wo=
golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
Expand Down Expand Up @@ -729,8 +729,8 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/net v0.20.0 h1:aCL9BSgETF1k+blQaYUBx9hJ9LOGP3gAVemcZlf1Kpo=
golang.org/x/net v0.20.0/go.mod h1:z8BVo6PvndSri0LbOE3hAn0apkU+1YvI6E70E9jsnvY=
golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
Expand Down Expand Up @@ -785,8 +785,8 @@ golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.16.0 h1:m+B6fahuftsE9qjo0VWp2FW0mB3MTJvR0BaMQrq0pmE=
golang.org/x/term v0.16.0/go.mod h1:yn7UURbUtPyrVJPGPq404EukNFxcm/foM+bV/bfcDsY=
golang.org/x/term v0.17.0 h1:mkTF7LCd6WGJNL3K1Ad7kwxNfYAW6a8a8QqtMblp/4U=
golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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