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* [PATCH v5 00/13] Add build ID to stacktraces
@ 2021-04-20 21:49 Stephen Boyd
  2021-04-20 21:49 ` [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing Stephen Boyd
  0 siblings, 1 reply; 3+ messages in thread
From: Stephen Boyd @ 2021-04-20 21:49 UTC (permalink / raw)
  To: Andrew Morton
  Cc: linux-kernel, Alexei Starovoitov, Andy Shevchenko, Baoquan He,
	Borislav Petkov, Catalin Marinas, Dave Young, Evan Green,
	Hsin-Yi Wang, Ingo Molnar, Jessica Yu, Jiri Olsa, kexec,
	Konstantin Khlebnikov, linux-arm-kernel, linux-doc,
	Matthew Wilcox, Petr Mladek, Rasmus Villemoes, Sasha Levin,
	Sergey Senozhatsky, Steven Rostedt, Thomas Gleixner, Vivek Goyal,
	Will Deacon, x86, Christoph Hellwig

This series adds the kernel's build ID[1] to the stacktrace header printed
in oops messages, warnings, etc. and the build ID for any module that
appears in the stacktrace after the module name. The goal is to make the
stacktrace more self-contained and descriptive by including the relevant
build IDs in the kernel logs when something goes wrong. This can be used
by post processing tools like script/decode_stacktrace.sh and kernel
developers to easily locate the debug info associated with a kernel
crash and line up what line and file things started falling apart at.

To show how this can be used I've included a patch to
decode_stacktrace.sh that downloads the debuginfo from a debuginfod
server.

This also includes some patches to make the buildid.c file use more
const arguments and consolidate logic into buildid.c from kdump. These
are left to the end as they were mostly cleanup patches. I don't know
who exactly maintains this so I guess Andrew is the best option to merge
all this code.

Here's an example lkdtm stacktrace on arm64.

 WARNING: CPU: 4 PID: 3255 at drivers/misc/lkdtm/bugs.c:83 lkdtm_WARNING+0x28/0x30 [lkdtm]
 Modules linked in: lkdtm rfcomm algif_hash algif_skcipher af_alg xt_cgroup uinput xt_MASQUERADE
 CPU: 4 PID: 3255 Comm: bash Not tainted 5.11 #3 aa23f7a1231c229de205662d5a9e0d4c580f19a1
 Hardware name: Google Lazor (rev3+) with KB Backlight (DT)
 pstate: 00400009 (nzcv daif +PAN -UAO -TCO BTYPE=--)
 pc : lkdtm_WARNING+0x28/0x30 [lkdtm]
 lr : lkdtm_do_action+0x24/0x40 [lkdtm]
 sp : ffffffc0134fbca0
 x29: ffffffc0134fbca0 x28: ffffff92d53ba240
 x27: 0000000000000000 x26: 0000000000000000
 x25: 0000000000000000 x24: ffffffe3622352c0
 x23: 0000000000000020 x22: ffffffe362233366
 x21: ffffffe3622352e0 x20: ffffffc0134fbde0
 x19: 0000000000000008 x18: 0000000000000000
 x17: ffffff929b6536fc x16: 0000000000000000
 x15: 0000000000000000 x14: 0000000000000012
 x13: ffffffe380ed892c x12: ffffffe381d05068
 x11: 0000000000000000 x10: 0000000000000000
 x9 : 0000000000000001 x8 : ffffffe362237000
 x7 : aaaaaaaaaaaaaaaa x6 : 0000000000000000
 x5 : 0000000000000000 x4 : 0000000000000001
 x3 : 0000000000000008 x2 : ffffff93fef25a70
 x1 : ffffff93fef15788 x0 : ffffffe3622352e0
 Call trace:
  lkdtm_WARNING+0x28/0x30 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
  direct_entry+0x16c/0x1b4 [lkdtm ed5019fdf5e53be37cb1ba7899292d7e143b259e]
  full_proxy_write+0x74/0xa4
  vfs_write+0xec/0x2e8
  ksys_write+0x84/0xf0
  __arm64_sys_write+0x24/0x30
  el0_svc_common+0xf4/0x1c0
  do_el0_svc_compat+0x28/0x3c
  el0_svc_compat+0x10/0x1c
  el0_sync_compat_handler+0xa8/0xcc
  el0_sync_compat+0x178/0x180
 ---[ end trace 3d95032303e59e68 ]---

Changes from v4 (https://lore.kernel.org/r/20210410015300.3764485-1-swboyd@chromium.org):
 * Stubbed out more code when CONFIG_STACKTRACE_BUILD_ID=n
 * Use static_assert instead of BUILD_BUG_ON()
 * Dropped bad printk change to IP on x86

Changes from v3 (https://lore.kernel.org/r/20210331030520.3816265-1-swboyd@chromium.org):
 * Fixed compilation warnings due to config changes
 * Fixed kernel-doc on init_vmlinx_build_id()
 * Totally removed add_build_id_vmcoreinfo()
 * Added another printk format %pBb to help x86 print backtraces
 * Some BUILD_BUG_ON() checks to make sure the buildid doesn't get bigger or smaller

Changes from v2 (https://lore.kernel.org/r/20210324020443.1815557-1-swboyd@chromium.org):
 * Renamed symbol printing function to indicate build IDness
 * Put build ID information behind Kconfig knob
 * Build ID for vmlinux is calculated in early init instead of on demand
 * printk format is %pS[R]b

Changes from v1 (https://lore.kernel.org/r/20210301174749.1269154-1-swboyd@chromium.org):
 * New printk format %pSb and %pSr
 * Return binary format instead of hex format string from build ID APIs
 * Some new patches to cleanup buildid/decode_stacktrace.sh
 * A new patch to decode_stacktrace.sh to parse output

[1] https://fedoraproject.org/wiki/Releases/FeatureBuildId

Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Evan Green <evgreen@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: <kexec@lists.infradead.org>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: <linux-doc@vger.kernel.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: <x86@kernel.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: peter enderborg <peter.
Stephen Boyd (13):
  buildid: Only consider GNU notes for build ID parsing
  buildid: Add API to parse build ID out of buffer
  buildid: Stash away kernels build ID on init
  dump_stack: Add vmlinux build ID to stack traces
  module: Add printk formats to add module build ID to stacktraces
  arm64: stacktrace: Use %pSb for backtrace printing
  x86/dumpstack: Use %pSb/%pBb for backtrace printing
  scripts/decode_stacktrace.sh: Support debuginfod
  scripts/decode_stacktrace.sh: Silence stderr messages from
    addr2line/nm
  scripts/decode_stacktrace.sh: Indicate 'auto' can be used for base
    path
  buildid: Mark some arguments const
  buildid: Fix kernel-doc notation
  kdump: Use vmlinux_build_id to simplify

 Documentation/core-api/printk-formats.rst |  11 +++
 arch/arm64/kernel/stacktrace.c            |   2 +-
 arch/x86/kernel/dumpstack.c               |   2 +-
 include/linux/buildid.h                   |   8 ++
 include/linux/crash_core.h                |  12 +--
 include/linux/kallsyms.h                  |  20 ++++-
 include/linux/module.h                    |   8 +-
 init/main.c                               |   1 +
 kernel/crash_core.c                       |  50 +----------
 kernel/kallsyms.c                         | 101 +++++++++++++++++-----
 kernel/module.c                           |  31 ++++++-
 lib/Kconfig.debug                         |  11 +++
 lib/buildid.c                             |  74 ++++++++++++----
 lib/dump_stack.c                          |  13 ++-
 lib/vsprintf.c                            |   8 +-
 scripts/decode_stacktrace.sh              |  89 +++++++++++++++----
 16 files changed, 327 insertions(+), 114 deletions(-)


base-commit: a38fd8748464831584a19438cbb3082b5a2dab15
-- 
https://chromeos.dev


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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing
  2021-04-20 21:49 [PATCH v5 00/13] Add build ID to stacktraces Stephen Boyd
@ 2021-04-20 21:49 ` Stephen Boyd
  2021-04-21  9:58   ` Catalin Marinas
  0 siblings, 1 reply; 3+ messages in thread
From: Stephen Boyd @ 2021-04-20 21:49 UTC (permalink / raw)
  To: Andrew Morton
  Cc: linux-kernel, Catalin Marinas, Will Deacon, linux-arm-kernel,
	Jiri Olsa, Alexei Starovoitov, Jessica Yu, Evan Green,
	Hsin-Yi Wang, Petr Mladek, Steven Rostedt, Andy Shevchenko,
	Matthew Wilcox

Let's use the new printk format to print the stacktrace entry when
printing a backtrace to the kernel logs. This will include any module's
build ID[1] in it so that offline/crash debugging can easily locate the
debuginfo for a module via something like debuginfod[2].

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Evan Green <evgreen@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Link: https://fedoraproject.org/wiki/Releases/FeatureBuildId [1]
Link: https://sourceware.org/elfutils/Debuginfod.html [2]
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/arm64/kernel/stacktrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index ad20981dfda4..9d38da01ff98 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -129,7 +129,7 @@ NOKPROBE_SYMBOL(walk_stackframe);
 
 static void dump_backtrace_entry(unsigned long where, const char *loglvl)
 {
-	printk("%s %pS\n", loglvl, (void *)where);
+	printk("%s %pSb\n", loglvl, (void *)where);
 }
 
 void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
-- 
https://chromeos.dev


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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing
  2021-04-20 21:49 ` [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing Stephen Boyd
@ 2021-04-21  9:58   ` Catalin Marinas
  0 siblings, 0 replies; 3+ messages in thread
From: Catalin Marinas @ 2021-04-21  9:58 UTC (permalink / raw)
  To: Stephen Boyd
  Cc: Andrew Morton, linux-kernel, Will Deacon, linux-arm-kernel,
	Jiri Olsa, Alexei Starovoitov, Jessica Yu, Evan Green,
	Hsin-Yi Wang, Petr Mladek, Steven Rostedt, Andy Shevchenko,
	Matthew Wilcox

On Tue, Apr 20, 2021 at 02:49:56PM -0700, Stephen Boyd wrote:
> Let's use the new printk format to print the stacktrace entry when
> printing a backtrace to the kernel logs. This will include any module's
> build ID[1] in it so that offline/crash debugging can easily locate the
> debuginfo for a module via something like debuginfod[2].
> 
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: <linux-arm-kernel@lists.infradead.org>
> Cc: Jiri Olsa <jolsa@kernel.org>
> Cc: Alexei Starovoitov <ast@kernel.org>
> Cc: Jessica Yu <jeyu@kernel.org>
> Cc: Evan Green <evgreen@chromium.org>
> Cc: Hsin-Yi Wang <hsinyi@chromium.org>
> Cc: Petr Mladek <pmladek@suse.com>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Matthew Wilcox <willy@infradead.org>
> Link: https://fedoraproject.org/wiki/Releases/FeatureBuildId [1]
> Link: https://sourceware.org/elfutils/Debuginfod.html [2]
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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2021-04-20 21:49 [PATCH v5 00/13] Add build ID to stacktraces Stephen Boyd
2021-04-20 21:49 ` [PATCH v5 06/13] arm64: stacktrace: Use %pSb for backtrace printing Stephen Boyd
2021-04-21  9:58   ` Catalin Marinas

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