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From 853d5903a200d8a15b3f38780ddaea5c92fa1a03 Mon Sep 17 00:00:00 2001
From: He Zhe <zhe.he@windriver.com>
Date: Mon, 19 Apr 2021 09:09:28 +0000
Subject: [PATCH 4/4] fix: mm, tracing: kfree event name mismatching with
provider kmem (v5.12)
a8bc8ae5c932 ("fix: mm, tracing: record slab name for kmem_cache_free() (v5.12)")
introduces the following call trace for kfree. This is caused by mismatch
between kfree event and its provider kmem.
This patch maps kfree to kmem_kfree.
WARNING: CPU: 2 PID: 42294 at src/lttng-probes.c:81 fixup_lazy_probes+0xb0/0x1b0 [lttng_tracer]
CPU: 2 PID: 42294 Comm: modprobe Tainted: G O 5.12.0-rc6-yoctodev-standard #1
Hardware name: Intel Corporation JACOBSVILLE/JACOBSVILLE, BIOS JBVLCRB2.86B.0014.P20.2004020248 04/02/2020
RIP: 0010:fixup_lazy_probes+0xb0/0x1b0 [lttng_tracer]
Code: 75 28 83 c3 01 3b 5d c4 74 22 48 8b 4d d0 48 63
c3 4c 89 e2 4c 89 f6 48 8b 04 c1 4c 8b 38 4c 89
ff e8 64 9f 4b de 85 c0 74 c3 <0f> 0b 48 8b 05 bf
f2 1e 00 48 8d 50 e8 48 3d f0 a0 98 c0 75 18 eb
RSP: 0018:ffffb976807bfbe0 EFLAGS: 00010286
RAX: 00000000ffffffff RBX: 0000000000000004 RCX: 0000000000000004
RDX: 0000000000000066 RSI: ffffffffc03c10a7 RDI: ffffffffc03c11a1
RBP: ffffb976807bfc28 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000004
R13: ffffffffc03c2000 R14: ffffffffc03c10a7 R15: ffffffffc03c11a1
FS: 00007f0ef9533740(0000) GS:ffffa100faa00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561e8f0aa000 CR3: 000000015b318000 CR4: 0000000000350ee0
Call Trace:
lttng_probe_register+0x38/0xe0 [lttng_tracer]
? __event_probe__module_load+0x520/0x520 [lttng_probe_module]
__lttng_events_init__module+0x15/0x20 [lttng_probe_module]
do_one_initcall+0x68/0x310
? kmem_cache_alloc_trace+0x2ad/0x4c0
? do_init_module+0x28/0x280
do_init_module+0x62/0x280
load_module+0x26e4/0x2920
? kernel_read_file+0x22e/0x290
__do_sys_finit_module+0xb1/0xf0
__x64_sys_finit_module+0x1a/0x20
do_syscall_64+0x38/0x50
entry_SYSCALL_64_after_hwframe+0x44/0xae
Upstream-Status: Backport [2.12.6]
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I00e8ee2b8c35f6f8602c88295f5113fbbd139709
---
instrumentation/events/lttng-module/kmem.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/instrumentation/events/lttng-module/kmem.h b/instrumentation/events/lttng-module/kmem.h
index d787ea54..c9edee61 100644
--- a/instrumentation/events/lttng-module/kmem.h
+++ b/instrumentation/events/lttng-module/kmem.h
@@ -88,7 +88,9 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(kmem_alloc_node, kmem_cache_alloc_node,
)
#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,12,0))
-LTTNG_TRACEPOINT_EVENT(kfree,
+LTTNG_TRACEPOINT_EVENT_MAP(kfree,
+
+ kmem_kfree,
TP_PROTO(unsigned long call_site, const void *ptr),
--
2.25.1
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