fix #2455 [Linux]: fix IndexError if /proc/pid/stat has no field …

…40 (blkio_ticks).
giampaolo · Oct 5, 2024 · 70b6787 · 70b6787
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diff --git a/HISTORY.rst b/HISTORY.rst
@@ -19,6 +19,8 @@ XXXX-XX-XX
 
 - 2427_: psutil (segfault) on import in the free-threaded (no GIL) version of
   Python 3.13.  (patch by Sam Gross)
+- 2455_, [Linux]: ``IndexError`` may occur when reading /proc/pid/stat and
+  field 40 (blkio_ticks) is missing.
 
 6.0.0
 ======

diff --git a/psutil/_pslinux.py b/psutil/_pslinux.py
@@ -1796,7 +1796,12 @@ def _parse_stat_file(self):
         ret['children_stime'] = fields[14]
         ret['create_time'] = fields[19]
         ret['cpu_num'] = fields[36]
-        ret['blkio_ticks'] = fields[39]  # aka 'delayacct_blkio_ticks'
+        try:
+            ret['blkio_ticks'] = fields[39]  # aka 'delayacct_blkio_ticks'
+        except IndexError:
+            # https://github.com/giampaolo/psutil/issues/2455
+            debug("can't get blkio_ticks, set iowait to 0")
+            ret['blkio_ticks'] = 0
 
         return ret