From patchwork Wed Aug 16 15:49:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Schnelle X-Patchwork-Id: 13355474 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75D69C001B0 for ; Wed, 16 Aug 2023 16:27:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344100AbjHPQ0e (ORCPT ); Wed, 16 Aug 2023 12:26:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344400AbjHPQ0K (ORCPT ); Wed, 16 Aug 2023 12:26:10 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 47FF41990; Wed, 16 Aug 2023 09:26:07 -0700 (PDT) Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 37GGOuHl032633; Wed, 16 Aug 2023 16:25:59 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=Wij6D2h2w36Wi4sdC7IYHNf84PoVmJCs6l/6oA+6jsU=; b=pC3y8YmZUOgg1ouqbHsg8FR8rUxBTWbj8YL8MCoaFLgeqlGlVPJEjOjWezrR/qvo5TE5 V12LEFT8yK0X1h+8q6y7rXxHpWgnZtczILCOV8nfa7/CgSSyrIn0Sf/obuHxpODCOIaJ zLeNyelrDOo8W6m1+9ieGVxwM4q5Y3Ne+Y89935KD59/Lb979Z0pHWW3llZ0Qa+z/NRU 1ZCyn3G7qpf/27CWv2BkrTaRhjz2kt71QoJgd8l+OaE0+AfuDNbuyrlOh2CbEXn2s3zK kKgs7waBTgHvFrwfcbDTestgX8/lxJSxKzmPz+xBmKg+1Xc0xqpB8a1xdq+HgDUoeCuW TA== Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3sh1y5019n-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 16 Aug 2023 16:25:58 +0000 Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 37GEdw5Z018920; Wed, 16 Aug 2023 15:49:47 GMT Received: from smtprelay02.fra02v.mail.ibm.com ([9.218.2.226]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 3seq41netn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 16 Aug 2023 15:49:47 +0000 Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 37GFnjQX57475502 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 16 Aug 2023 15:49:45 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 874E820043; Wed, 16 Aug 2023 15:49:45 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 685AF20040; Wed, 16 Aug 2023 15:49:45 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 16 Aug 2023 15:49:45 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55390) id 2EB49E012C; Wed, 16 Aug 2023 17:49:45 +0200 (CEST) From: Sven Schnelle To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Masami Hiramatsu , linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH RESEND v3 1/3] tracing/synthetic: use union instead of casts Date: Wed, 16 Aug 2023 17:49:26 +0200 Message-Id: <20230816154928.4171614-2-svens@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230816154928.4171614-1-svens@linux.ibm.com> References: <20230816154928.4171614-1-svens@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: MXR9ODk57Y86LoI3tMebgPMoBz1-IISF X-Proofpoint-ORIG-GUID: MXR9ODk57Y86LoI3tMebgPMoBz1-IISF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-16_16,2023-08-15_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 mlxlogscore=999 lowpriorityscore=0 adultscore=0 malwarescore=0 mlxscore=0 impostorscore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308160140 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org The current code uses a lot of casts to access the fields member in struct synth_trace_events with different sizes. This makes the code hard to read, and had already introduced an endianness bug. Use a union and struct instead. Signed-off-by: Sven Schnelle --- include/linux/trace_events.h | 11 ++++ kernel/trace/trace.h | 8 +++ kernel/trace/trace_events_synth.c | 87 +++++++++++++------------------ 3 files changed, 56 insertions(+), 50 deletions(-) diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 3930e676436c..1e8bbdb8da90 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -59,6 +59,17 @@ int trace_raw_output_prep(struct trace_iterator *iter, extern __printf(2, 3) void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...); +/* Used to find the offset and length of dynamic fields in trace events */ +struct trace_dynamic_info { +#ifdef CONFIG_CPU_BIG_ENDIAN + u16 offset; + u16 len; +#else + u16 len; + u16 offset; +#endif +}; + /* * The trace entry - the most basic unit of tracing. This is what * is printed in the end as a single line in the trace output, such as: diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index e1edc2197fc8..95956f75bea5 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1295,6 +1295,14 @@ static inline void trace_branch_disable(void) /* set ring buffers to default size if not already done so */ int tracing_update_buffers(void); +union trace_synth_field { + u8 as_u8; + u16 as_u16; + u32 as_u32; + u64 as_u64; + struct trace_dynamic_info as_dynamic; +}; + struct ftrace_event_field { struct list_head link; const char *name; diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c index dd398afc8e25..7fff8235075f 100644 --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -127,7 +127,7 @@ static bool synth_event_match(const char *system, const char *event, struct synth_trace_event { struct trace_entry ent; - u64 fields[]; + union trace_synth_field fields[]; }; static int synth_event_define_fields(struct trace_event_call *call) @@ -321,19 +321,19 @@ static const char *synth_field_fmt(char *type) static void print_synth_event_num_val(struct trace_seq *s, char *print_fmt, char *name, - int size, u64 val, char *space) + int size, union trace_synth_field *val, char *space) { switch (size) { case 1: - trace_seq_printf(s, print_fmt, name, (u8)val, space); + trace_seq_printf(s, print_fmt, name, val->as_u8, space); break; case 2: - trace_seq_printf(s, print_fmt, name, (u16)val, space); + trace_seq_printf(s, print_fmt, name, val->as_u16, space); break; case 4: - trace_seq_printf(s, print_fmt, name, (u32)val, space); + trace_seq_printf(s, print_fmt, name, val->as_u32, space); break; default: @@ -374,36 +374,26 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, /* parameter values */ if (se->fields[i]->is_string) { if (se->fields[i]->is_dynamic) { - u32 offset, data_offset; - char *str_field; - - offset = (u32)entry->fields[n_u64]; - data_offset = offset & 0xffff; - - str_field = (char *)entry + data_offset; + union trace_synth_field *data = &entry->fields[n_u64]; trace_seq_printf(s, print_fmt, se->fields[i]->name, STR_VAR_LEN_MAX, - str_field, + (char *)entry + data->as_dynamic.offset, i == se->n_fields - 1 ? "" : " "); n_u64++; } else { trace_seq_printf(s, print_fmt, se->fields[i]->name, STR_VAR_LEN_MAX, - (char *)&entry->fields[n_u64], + (char *)&entry->fields[n_u64].as_u64, i == se->n_fields - 1 ? "" : " "); n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } } else if (se->fields[i]->is_stack) { - u32 offset, data_offset, len; unsigned long *p, *end; + union trace_synth_field *data = &entry->fields[n_u64]; - offset = (u32)entry->fields[n_u64]; - data_offset = offset & 0xffff; - len = offset >> 16; - - p = (void *)entry + data_offset; - end = (void *)p + len - (sizeof(long) - 1); + p = (void *)entry + data->as_dynamic.offset; + end = (void *)p + data->as_dynamic.len - (sizeof(long) - 1); trace_seq_printf(s, "%s=STACK:\n", se->fields[i]->name); @@ -419,13 +409,13 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, print_synth_event_num_val(s, print_fmt, se->fields[i]->name, se->fields[i]->size, - entry->fields[n_u64], + &entry->fields[n_u64], space); if (strcmp(se->fields[i]->type, "gfp_t") == 0) { trace_seq_puts(s, " ("); trace_print_flags_seq(s, "|", - entry->fields[n_u64], + entry->fields[n_u64].as_u64, __flags); trace_seq_putc(s, ')'); } @@ -454,21 +444,16 @@ static unsigned int trace_string(struct synth_trace_event *entry, int ret; if (is_dynamic) { - u32 data_offset; + union trace_synth_field *data = &entry->fields[*n_u64]; - data_offset = struct_size(entry, fields, event->n_u64); - data_offset += data_size; - - len = fetch_store_strlen((unsigned long)str_val); - - data_offset |= len << 16; - *(u32 *)&entry->fields[*n_u64] = data_offset; + data->as_dynamic.offset = struct_size(entry, fields, event->n_u64) + data_size; + data->as_dynamic.len = fetch_store_strlen((unsigned long)str_val); ret = fetch_store_string((unsigned long)str_val, &entry->fields[*n_u64], entry); (*n_u64)++; } else { - str_field = (char *)&entry->fields[*n_u64]; + str_field = (char *)&entry->fields[*n_u64].as_u64; #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE if ((unsigned long)str_val < TASK_SIZE) @@ -492,6 +477,7 @@ static unsigned int trace_stack(struct synth_trace_event *entry, unsigned int data_size, unsigned int *n_u64) { + union trace_synth_field *data = &entry->fields[*n_u64]; unsigned int len; u32 data_offset; void *data_loc; @@ -515,8 +501,9 @@ static unsigned int trace_stack(struct synth_trace_event *entry, memcpy(data_loc, stack, len); /* Fill in the field that holds the offset/len combo */ - data_offset |= len << 16; - *(u32 *)&entry->fields[*n_u64] = data_offset; + + data->as_dynamic.offset = data_offset; + data->as_dynamic.len = len; (*n_u64)++; @@ -592,19 +579,19 @@ static notrace void trace_event_raw_event_synth(void *__data, switch (field->size) { case 1: - *(u8 *)&entry->fields[n_u64] = (u8)val; + entry->fields[n_u64].as_u8 = (u8)val; break; case 2: - *(u16 *)&entry->fields[n_u64] = (u16)val; + entry->fields[n_u64].as_u16 = (u16)val; break; case 4: - *(u32 *)&entry->fields[n_u64] = (u32)val; + entry->fields[n_u64].as_u32 = (u32)val; break; default: - entry->fields[n_u64] = val; + entry->fields[n_u64].as_u64 = val; break; } n_u64++; @@ -1791,19 +1778,19 @@ int synth_event_trace(struct trace_event_file *file, unsigned int n_vals, ...) switch (field->size) { case 1: - *(u8 *)&state.entry->fields[n_u64] = (u8)val; + state.entry->fields[n_u64].as_u8 = (u8)val; break; case 2: - *(u16 *)&state.entry->fields[n_u64] = (u16)val; + state.entry->fields[n_u64].as_u16 = (u16)val; break; case 4: - *(u32 *)&state.entry->fields[n_u64] = (u32)val; + state.entry->fields[n_u64].as_u32 = (u32)val; break; default: - state.entry->fields[n_u64] = val; + state.entry->fields[n_u64].as_u64 = val; break; } n_u64++; @@ -1884,19 +1871,19 @@ int synth_event_trace_array(struct trace_event_file *file, u64 *vals, switch (field->size) { case 1: - *(u8 *)&state.entry->fields[n_u64] = (u8)val; + state.entry->fields[n_u64].as_u8 = (u8)val; break; case 2: - *(u16 *)&state.entry->fields[n_u64] = (u16)val; + state.entry->fields[n_u64].as_u16 = (u16)val; break; case 4: - *(u32 *)&state.entry->fields[n_u64] = (u32)val; + state.entry->fields[n_u64].as_u32 = (u32)val; break; default: - state.entry->fields[n_u64] = val; + state.entry->fields[n_u64].as_u64 = val; break; } n_u64++; @@ -2031,19 +2018,19 @@ static int __synth_event_add_val(const char *field_name, u64 val, } else { switch (field->size) { case 1: - *(u8 *)&trace_state->entry->fields[field->offset] = (u8)val; + trace_state->entry->fields[field->offset].as_u8 = (u8)val; break; case 2: - *(u16 *)&trace_state->entry->fields[field->offset] = (u16)val; + trace_state->entry->fields[field->offset].as_u16 = (u16)val; break; case 4: - *(u32 *)&trace_state->entry->fields[field->offset] = (u32)val; + trace_state->entry->fields[field->offset].as_u32 = (u32)val; break; default: - trace_state->entry->fields[field->offset] = val; + trace_state->entry->fields[field->offset].as_u64 = val; break; } } From patchwork Wed Aug 16 15:49:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Schnelle X-Patchwork-Id: 13355469 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ACB96C41513 for ; Wed, 16 Aug 2023 16:18:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344603AbjHPQS1 (ORCPT ); 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Wed, 16 Aug 2023 15:49:46 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55390) id D63C0E012C; Wed, 16 Aug 2023 17:49:45 +0200 (CEST) From: Sven Schnelle To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Masami Hiramatsu , linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH RESEND v3 2/3] tracing/synthetic: skip first entry for stack traces Date: Wed, 16 Aug 2023 17:49:27 +0200 Message-Id: <20230816154928.4171614-3-svens@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230816154928.4171614-1-svens@linux.ibm.com> References: <20230816154928.4171614-1-svens@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: EuPMFYJ89KLizs5WJYxpGi2ZxcmHwTbA X-Proofpoint-ORIG-GUID: EuPMFYJ89KLizs5WJYxpGi2ZxcmHwTbA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-16_16,2023-08-15_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=999 impostorscore=0 mlxscore=0 clxscore=1015 suspectscore=0 spamscore=0 malwarescore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308160140 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org While debugging another issue i noticed that the stack trace output contains the number of entries on top: -0 [000] d..4. 203.322502: wake_lat: pid=0 delta=2268270616 stack=STACK: => 0x10 => __schedule+0xac6/0x1a98 => schedule+0x126/0x2c0 => schedule_timeout+0x242/0x2c0 => __wait_for_common+0x434/0x680 => __wait_rcu_gp+0x198/0x3e0 => synchronize_rcu+0x112/0x138 => ring_buffer_reset_online_cpus+0x140/0x2e0 => tracing_reset_online_cpus+0x15c/0x1d0 => tracing_set_clock+0x180/0x1d8 => hist_register_trigger+0x486/0x670 => event_hist_trigger_parse+0x494/0x1318 => trigger_process_regex+0x1d4/0x258 => event_trigger_write+0xb4/0x170 => vfs_write+0x210/0xad0 => ksys_write+0x122/0x208 Fix this by skipping the first element. Also replace the pointer logic with an index variable which is easier to read. Fixes: 00cf3d672a9d ("tracing: Allow synthetic events to pass around stacktraces") Signed-off-by: Sven Schnelle --- kernel/trace/trace_events_synth.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c index 7fff8235075f..80a2a832f857 100644 --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -350,7 +350,7 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, struct trace_seq *s = &iter->seq; struct synth_trace_event *entry; struct synth_event *se; - unsigned int i, n_u64; + unsigned int i, j, n_u64; char print_fmt[32]; const char *fmt; @@ -389,18 +389,13 @@ static enum print_line_t print_synth_event(struct trace_iterator *iter, n_u64 += STR_VAR_LEN_MAX / sizeof(u64); } } else if (se->fields[i]->is_stack) { - unsigned long *p, *end; union trace_synth_field *data = &entry->fields[n_u64]; - - p = (void *)entry + data->as_dynamic.offset; - end = (void *)p + data->as_dynamic.len - (sizeof(long) - 1); + unsigned long *p = (void *)entry + data->as_dynamic.offset; trace_seq_printf(s, "%s=STACK:\n", se->fields[i]->name); - - for (; *p && p < end; p++) - trace_seq_printf(s, "=> %pS\n", (void *)*p); + for (j = 1; j < data->as_dynamic.len / sizeof(long); j++) + trace_seq_printf(s, "=> %pS\n", (void *)p[j]); n_u64++; - } else { struct trace_print_flags __flags[] = { __def_gfpflag_names, {-1, NULL} }; @@ -490,10 +485,6 @@ static unsigned int trace_stack(struct synth_trace_event *entry, break; } - /* Include the zero'd element if it fits */ - if (len < HIST_STACKTRACE_DEPTH) - len++; - len *= sizeof(long); /* Find the dynamic section to copy the stack into. */ From patchwork Wed Aug 16 15:49:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Schnelle X-Patchwork-Id: 13355448 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A1FDC001B0 for ; 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Wed, 16 Aug 2023 15:49:46 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 55390) id 7BC89E012C; Wed, 16 Aug 2023 17:49:46 +0200 (CEST) From: Sven Schnelle To: Steven Rostedt Cc: linux-kernel@vger.kernel.org, Masami Hiramatsu , linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH RESEND v3 3/3] tracing/synthetic: allocate one additional element for size Date: Wed, 16 Aug 2023 17:49:28 +0200 Message-Id: <20230816154928.4171614-4-svens@linux.ibm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230816154928.4171614-1-svens@linux.ibm.com> References: <20230816154928.4171614-1-svens@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Rq6ZPzLbUSRNKmXEE-XkXN_ezXXgVytQ X-Proofpoint-GUID: Rq6ZPzLbUSRNKmXEE-XkXN_ezXXgVytQ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-16_15,2023-08-15_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 mlxscore=0 priorityscore=1501 spamscore=0 adultscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308160135 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org While debugging another issue i noticed that the stack trace contains one invalid entry at the end: -0 [008] d..4. 26.484201: wake_lat: pid=0 delta=2629976084 000000009cc24024 stack=STACK: => __schedule+0xac6/0x1a98 => schedule+0x126/0x2c0 => schedule_timeout+0x150/0x2c0 => kcompactd+0x9ca/0xc20 => kthread+0x2f6/0x3d8 => __ret_from_fork+0x8a/0xe8 => 0x6b6b6b6b6b6b6b6b This is because the code failed to add the one element containing the number of entries to field_size. Fixes: 00cf3d672a9d ("tracing: Allow synthetic events to pass around stacktraces") Signed-off-by: Sven Schnelle --- kernel/trace/trace_events_synth.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c index 80a2a832f857..9897d0bfcab7 100644 --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -528,7 +528,8 @@ static notrace void trace_event_raw_event_synth(void *__data, str_val = (char *)(long)var_ref_vals[val_idx]; if (event->dynamic_fields[i]->is_stack) { - len = *((unsigned long *)str_val); + /* reserve one extra element for size */ + len = *((unsigned long *)str_val) + 1; len *= sizeof(unsigned long); } else { len = fetch_store_strlen((unsigned long)str_val);