[igt RFC 1/3] lib/debugfs: Make is_mountpoint() non-fatal

[igt RFC 1/3] lib/debugfs: Make is_mountpoint() non-fatal

[Chris Wilson]

is_mountpoint() asserts rather than report the error. Normally this
isn't a problem, except for atypical selftests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/igt_debugfs.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 60b29e3a..2bdcdee1 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -88,18 +88,26 @@
 static bool is_mountpoint(const char *path)
 {
 	char buf[strlen(path) + 4];
-	dev_t dot_dev, dotdot_dev;
 	struct stat st;
+	dev_t dev;
 
 	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
-	igt_assert_eq(stat(buf, &st), 0);
-	dot_dev = st.st_dev;
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	dev = st.st_dev;
 
 	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
-	igt_assert_eq(stat(buf, &st), 0);
-	dotdot_dev = st.st_dev;
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
 
-	return dot_dev != dotdot_dev;
+	return dev != st.st_dev;
 }
 
 /**
@@ -113,16 +121,14 @@ static bool is_mountpoint(const char *path)
  */
 const char *igt_debugfs_mount(void)
 {
-	struct stat st;
+	if (is_mountpoint("/sys/kernel/debug"))
+		return "/sys/kernel/debug";
 
-	if (stat("/debug/dri", &st) == 0)
+	if (is_mountpoint("/debug"))
 		return "/debug";
 
-	if (stat("/sys/kernel/debug/dri", &st) == 0)
-		return "/sys/kernel/debug";
-
-	igt_assert(is_mountpoint("/sys/kernel/debug") ||
-		   mount("debug", "/sys/kernel/debug", "debugfs", 0, 0) == 0);
+	if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
+		return NULL;
 
 	return "/sys/kernel/debug";
 }
@@ -155,6 +161,7 @@ char *igt_debugfs_path(int device, char *path, int pathlen)
 	}
 
 	debugfs_root = igt_debugfs_mount();
+	igt_assert(debugfs_root);
 
 	idx = minor(st.st_rdev);
 	snprintf(path, pathlen, "%s/dri/%d/name", debugfs_root, idx);
-- 
2.15.0.rc0

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[igt RFC 2/3] lib: Add hooks for enabling ftrace

[Chris Wilson]

If the kernel has tracing support builtin, we can enable around
troublesome tests to obtain greater detail from the kernel that may
prove invaluable in debugging the problem.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/Makefile.sources |   2 +
 lib/igt_core.c       |   5 ++
 lib/igt_ftrace.c     | 181 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/igt_ftrace.h     |  46 +++++++++++++
 4 files changed, 234 insertions(+)
 create mode 100644 lib/igt_ftrace.c
 create mode 100644 lib/igt_ftrace.h

diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index 965e230e..7ae9cfb9 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -12,6 +12,8 @@ lib_source_list =	 	\
 	igt_aux.c		\
 	igt_aux.h		\
 	igt_edid_template.h	\
+	igt_ftrace.c		\
+	igt_ftrace.h		\
 	igt_gt.c		\
 	igt_gt.h		\
 	igt_gvt.c		\
diff --git a/lib/igt_core.c b/lib/igt_core.c
index 480d4b1e..3d928eba 100644
--- a/lib/igt_core.c
+++ b/lib/igt_core.c
@@ -64,6 +64,7 @@
 #include "intel_io.h"
 #include "igt_debugfs.h"
 #include "igt_dummyload.h"
+#include "igt_ftrace.h"
 #include "version.h"
 #include "config.h"
 
@@ -565,6 +566,8 @@ static void low_mem_killer_disable(bool disable)
 bool igt_exit_called;
 static void common_exit_handler(int sig)
 {
+	igt_ftrace_close();
+
 	if (!igt_only_list_subtests()) {
 		low_mem_killer_disable(false);
 		kick_fbcon(true);
@@ -859,6 +862,8 @@ out:
 		sync();
 		oom_adjust_for_doom();
 		low_mem_killer_disable(true);
+
+		igt_ftrace_open();
 	}
 
 	/* install exit handler, to ensure we clean up */
diff --git a/lib/igt_ftrace.c b/lib/igt_ftrace.c
new file mode 100644
index 00000000..5b618f11
--- /dev/null
+++ b/lib/igt_ftrace.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "igt.h"
+#include "igt_ftrace.h"
+#include "igt_debugfs.h"
+#include "igt_sysfs.h"
+
+#define BIT(x) (1ul << (x))
+
+/* Only a single tracer in the kernel, so we can use a singleton */
+struct igt_ftrace {
+	int dir;
+
+	unsigned long flags;
+#define PID_SET BIT(0)
+#define INCLUDE_SET BIT(1)
+#define EXCLUDE_SET BIT(2)
+
+} igt_ftrace = { -1 };
+
+int igt_ftrace_open(void)
+{
+	int dir;
+	int err;
+
+	dir = open(igt_debugfs_mount(), O_RDONLY);
+	if (dir < 0)
+		return -errno;
+
+	igt_ftrace.dir = openat(dir, "tracing", O_RDONLY);
+	close(dir);
+	if (igt_ftrace.dir < 0)
+		return -errno;
+
+	err = igt_ftrace_disable();
+	if (err)
+		goto ft_close;
+
+	return 0;
+
+ft_close:
+	close(igt_ftrace.dir);
+	igt_ftrace.dir = -1;
+	return err;
+}
+
+int __igt_ftrace_enable(const char *mode,
+			const struct igt_ftrace_options *opts)
+{
+	int err;
+
+	if (igt_ftrace.dir < 0)
+		return -ENODEV;
+
+	if (!mode)
+		return -EINVAL;
+
+	err = igt_sysfs_set(igt_ftrace.dir, "current_tracer", mode);
+	if (err < 0)
+		return err;
+
+	if (opts && opts->pid) {
+		err = igt_sysfs_printf(igt_ftrace.dir,
+				       "set_ftrace_pid", "%d",
+				       opts->pid);
+		if (err < 0)
+			goto disable;
+
+		igt_ftrace.flags |= PID_SET;
+	}
+
+	if (opts && opts->include) {
+		err = igt_sysfs_set(igt_ftrace.dir,
+				    "set_ftrace_filter",
+				    opts->include);
+		if (err < 0)
+			goto disable;
+
+		igt_ftrace.flags |= INCLUDE_SET;
+	}
+
+	if (opts && opts->exclude) {
+		err = igt_sysfs_set(igt_ftrace.dir,
+				    "set_ftrace_notrace",
+				    opts->exclude);
+		if (err < 0)
+			goto disable;
+
+		igt_ftrace.flags |= EXCLUDE_SET;
+	}
+
+	err = igt_sysfs_set(igt_ftrace.dir, "tracer_on", "1");
+	if (err < 0)
+		return err;
+
+	return 0;
+
+disable:
+	igt_ftrace_disable();
+	return err;
+}
+
+int igt_ftrace_disable(void)
+{
+	int err;
+
+	if (igt_ftrace.dir < 0)
+		return -ENODEV;
+
+	err = igt_sysfs_set(igt_ftrace.dir, "tracer_on", "0");
+	if (err < 0)
+		return err;
+
+	if (igt_ftrace.flags & PID_SET) {
+		igt_sysfs_set(igt_ftrace.dir, "set_ftrace_pid", "");
+		igt_ftrace.flags &= ~PID_SET;
+	}
+
+	if (igt_ftrace.flags & INCLUDE_SET) {
+		igt_sysfs_set(igt_ftrace.dir, "set_ftrace_filter", "");
+		igt_ftrace.flags &= ~INCLUDE_SET;
+	}
+
+	if (igt_ftrace.flags & EXCLUDE_SET) {
+		igt_sysfs_set(igt_ftrace.dir, "set_ftrace_notrace", "");
+		igt_ftrace.flags &= ~EXCLUDE_SET;
+	}
+
+	return 0;
+}
+
+void igt_ftrace_dump(const char *header)
+{
+	char *txt;
+
+	if (igt_ftrace.dir < 0)
+		return;
+
+	txt = igt_sysfs_get(igt_ftrace.dir, "trace");
+	if (!txt)
+		return;
+
+	igt_info("%s:\n%s", header, txt);
+	free(txt);
+}
+
+void igt_ftrace_close(void)
+{
+	if (igt_ftrace.dir < 0)
+		return;
+
+	close(igt_ftrace.dir);
+	igt_ftrace.dir = -1;
+}
diff --git a/lib/igt_ftrace.h b/lib/igt_ftrace.h
new file mode 100644
index 00000000..3dd67682
--- /dev/null
+++ b/lib/igt_ftrace.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#ifndef IGT_FTRACE_H
+#define IGT_FTRACE_H
+
+int igt_ftrace_open(void);
+
+struct igt_ftrace_options {
+	int pid;
+	const char *include;
+	const char *exclude;
+};
+
+int __igt_ftrace_enable(const char *mode,
+			const struct igt_ftrace_options *opts);
+#define igt_ftrace_enable() __igt_ftrace_enable("function_graph", NULL)
+
+int igt_ftrace_disable(void);
+
+void igt_ftrace_dump(const char *header);
+
+void igt_ftrace_close(void);
+
+#endif /* IGT_FTRACE_H */
-- 
2.15.0.rc0

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[igt RFC 3/3] lib: Enable automatic ftrace dumping for suspend failures

[Chris Wilson]

Supplement dmesg with the function call graph to try and help identify
why the suspend failed. On the other hand, it may be very noisy and
perturb the system due to its overhead...

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 lib/igt_aux.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index fa6594c3..ae076aaa 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -54,6 +54,7 @@
 #include "intel_chipset.h"
 #include "igt_aux.h"
 #include "igt_debugfs.h"
+#include "igt_ftrace.h"
 #include "igt_gt.h"
 #include "igt_rand.h"
 #include "igt_sysfs.h"
@@ -762,13 +763,19 @@ static void suspend_via_rtcwake(enum igt_suspend_state state)
 		     "the rtcwake tool or how your distro is set up.\n",
 		      ret);
 
+	igt_ftrace_enable();
+
 	snprintf(cmd, sizeof(cmd), "rtcwake -s %d -m %s ",
 		 delay, suspend_state_name[state]);
 	ret = system(cmd);
-	igt_assert_f(ret == 0,
-		     "rtcwake failed with %i\n"
-		     "Check dmesg for further details.\n",
-		     ret);
+
+	igt_ftrace_disable();
+	if (ret) {
+		igt_warn("rtcwake failed with %i\n", ret);
+		igt_ftrace_dump(__func__);
+		igt_assert_f(ret == 0,
+			     "Check dmesg for further details.\n");
+	}
 }
 
 static void suspend_via_sysfs(int power_dir, enum igt_suspend_state state)
-- 
2.15.0.rc0

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Re: [igt RFC 2/3] lib: Add hooks for enabling ftrace

[Chris Wilson]

Quoting Chris Wilson (2017-10-13 13:02:58)
> If the kernel has tracing support builtin, we can enable around
> troublesome tests to obtain greater detail from the kernel that may
> prove invaluable in debugging the problem.

Michał pointed out that there is a ftrace-dump-on-oops flag, which could
very well be a way we can vastly increase debug output without
increasing the noise. The challenge is putting it to use. We could start
with a plain function_tracer and see where we need to go from there; I
think we want to trace_printk() (as possibly a igt_trace_printk if we
want to go overboard).
-Chris
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Re: [igt RFC 1/3] lib/debugfs: Make is_mountpoint() non-fatal

[Ville Syrjälä]

On Fri, Oct 13, 2017 at 01:02:57PM +0100, Chris Wilson wrote:
> is_mountpoint() asserts rather than report the error. Normally this
> isn't a problem, except for atypical selftests.
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  lib/igt_debugfs.c | 33 ++++++++++++++++++++-------------
>  1 file changed, 20 insertions(+), 13 deletions(-)
> 
> diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
> index 60b29e3a..2bdcdee1 100644
> --- a/lib/igt_debugfs.c
> +++ b/lib/igt_debugfs.c
> @@ -88,18 +88,26 @@
>  static bool is_mountpoint(const char *path)
>  {
>  	char buf[strlen(path) + 4];
> -	dev_t dot_dev, dotdot_dev;
>  	struct stat st;
> +	dev_t dev;
>  
>  	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
> -	igt_assert_eq(stat(buf, &st), 0);
> -	dot_dev = st.st_dev;
> +	if (stat(buf, &st))
> +		return false;
> +
> +	if (!S_ISDIR(st.st_mode))
> +		return false;
> +
> +	dev = st.st_dev;
>  
>  	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
> -	igt_assert_eq(stat(buf, &st), 0);
> -	dotdot_dev = st.st_dev;
> +	if (stat(buf, &st))
> +		return false;
> +
> +	if (!S_ISDIR(st.st_mode))
> +		return false;
>  
> -	return dot_dev != dotdot_dev;
> +	return dev != st.st_dev;
>  }
>  
>  /**
> @@ -113,16 +121,14 @@ static bool is_mountpoint(const char *path)
>   */
>  const char *igt_debugfs_mount(void)
>  {
> -	struct stat st;
> +	if (is_mountpoint("/sys/kernel/debug"))
> +		return "/sys/kernel/debug";
>  
> -	if (stat("/debug/dri", &st) == 0)
> +	if (is_mountpoint("/debug"))
>  		return "/debug";
>  
> -	if (stat("/sys/kernel/debug/dri", &st) == 0)
> -		return "/sys/kernel/debug";
> -
> -	igt_assert(is_mountpoint("/sys/kernel/debug") ||
> -		   mount("debug", "/sys/kernel/debug", "debugfs", 0, 0) == 0);
> +	if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
> +		return NULL;
>  
>  	return "/sys/kernel/debug";
>  }
> @@ -155,6 +161,7 @@ char *igt_debugfs_path(int device, char *path, int pathlen)
>  	}
>  
>  	debugfs_root = igt_debugfs_mount();
> +	igt_assert(debugfs_root);
>  
>  	idx = minor(st.st_rdev);
>  	snprintf(path, pathlen, "%s/dri/%d/name", debugfs_root, idx);
> -- 
> 2.15.0.rc0
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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✓ Fi.CI.BAT: success for series starting with [RFC,1/3] lib/debugfs: Make is_mountpoint() non-fatal

[Patchwork]

== Series Details ==

Series: series starting with [RFC,1/3] lib/debugfs: Make is_mountpoint() non-fatal
URL   : https://patchwork.freedesktop.org/series/31911/
State : success

== Summary ==

IGT patchset tested on top of latest successful build
58616272b23efce1e62a3ee0d37e13de6ffc012f igt/gem_eio: Check hang/eio recovery during suspend

with latest DRM-Tip kernel build CI_DRM_3228
b2c76c5c6dce drm-tip: 2017y-10m-13d-09h-16m-12s UTC integration manifest

No testlist changes.

fi-bdw-5557u     total:289  pass:268  dwarn:0   dfail:0   fail:0   skip:21  time:460s
fi-bdw-gvtdvm    total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:471s
fi-blb-e6850     total:289  pass:223  dwarn:1   dfail:0   fail:0   skip:65  time:395s
fi-bsw-n3050     total:289  pass:243  dwarn:0   dfail:0   fail:0   skip:46  time:580s
fi-bwr-2160      total:289  pass:183  dwarn:0   dfail:0   fail:0   skip:106 time:292s
fi-bxt-dsi       total:289  pass:259  dwarn:0   dfail:0   fail:0   skip:30  time:528s
fi-bxt-j4205     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:526s
fi-byt-j1900     total:289  pass:253  dwarn:1   dfail:0   fail:0   skip:35  time:543s
fi-byt-n2820     total:289  pass:249  dwarn:1   dfail:0   fail:0   skip:39  time:540s
fi-cfl-s         total:289  pass:253  dwarn:4   dfail:0   fail:0   skip:32  time:568s
fi-cnl-y         total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:638s
fi-elk-e7500     total:289  pass:229  dwarn:0   dfail:0   fail:0   skip:60  time:436s
fi-gdg-551       total:289  pass:178  dwarn:1   dfail:0   fail:1   skip:109 time:275s
fi-glk-1         total:289  pass:261  dwarn:0   dfail:0   fail:0   skip:28  time:605s
fi-hsw-4770r     total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:441s
fi-ilk-650       total:289  pass:228  dwarn:0   dfail:0   fail:0   skip:61  time:465s
fi-ivb-3520m     total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:507s
fi-ivb-3770      total:289  pass:260  dwarn:0   dfail:0   fail:0   skip:29  time:475s
fi-kbl-7500u     total:289  pass:264  dwarn:1   dfail:0   fail:0   skip:24  time:508s
fi-kbl-7567u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:492s
fi-kbl-r         total:289  pass:262  dwarn:0   dfail:0   fail:0   skip:27  time:601s
fi-pnv-d510      total:289  pass:222  dwarn:1   dfail:0   fail:0   skip:66  time:654s
fi-skl-6260u     total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:464s
fi-skl-6700hq    total:289  pass:263  dwarn:0   dfail:0   fail:0   skip:26  time:664s
fi-skl-6700k     total:289  pass:265  dwarn:0   dfail:0   fail:0   skip:24  time:533s
fi-skl-6770hq    total:289  pass:269  dwarn:0   dfail:0   fail:0   skip:20  time:518s
fi-snb-2520m     total:289  pass:250  dwarn:0   dfail:0   fail:0   skip:39  time:599s
fi-snb-2600      total:289  pass:249  dwarn:0   dfail:0   fail:0   skip:40  time:438s

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_352/
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✓ Fi.CI.IGT: success for series starting with [RFC,1/3] lib/debugfs: Make is_mountpoint() non-fatal

[Patchwork]

== Series Details ==

Series: series starting with [RFC,1/3] lib/debugfs: Make is_mountpoint() non-fatal
URL   : https://patchwork.freedesktop.org/series/31911/
State : success

== Summary ==

Test kms_atomic_transition:
        Subgroup plane-toggle-modeset-transition:
                dmesg-warn -> PASS       (shard-hsw) fdo#102614
Test kms_flip:
        Subgroup modeset-vs-vblank-race:
                pass       -> FAIL       (shard-hsw) fdo#102919

fdo#102614 https://bugs.freedesktop.org/show_bug.cgi?id=102614
fdo#102919 https://bugs.freedesktop.org/show_bug.cgi?id=102919

shard-hsw        total:2553 pass:1439 dwarn:1   dfail:0   fail:10  skip:1103 time:9706s

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_352/shards.html
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