linux-ext4 - [Bug 215712] kernel deadlocks while mounting the image

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Date:   Thu, 24 Mar 2022 12:21:38 +0000
From:   bugzilla-daemon@...nel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 215712] kernel deadlocks while mounting the image

https://bugzilla.kernel.org/show_bug.cgi?id=215712

--- Comment #5 from Christian Kujau (lists@...dbynature.de) ---
Another attempt to mount the image through trace-cmd took an hour to complete
and produced a trace.dat file, good thing btrfs compression shrank that down to
18 GB :-)

$ trace-cmd record -e ext4 mount -v -t ext4 -o loop,ro,debug ~/tmp.img
/mnt/test/
$ trace-cmd hist
  %-2110.90  (599) mount    ext4_es_lookup_extent_enter #2097643693
         |
         --- *ext4_es_lookup_extent_enter*

  %-2110.90  (599) mount     ext4_es_lookup_extent_exit #2097643669
         |
         --- *ext4_es_lookup_extent_exit*

  %-0.29  (33) kswapd0           ext4_es_shrink_count #292356
         |
         --- *ext4_es_shrink_count*

  %-0.00  (597) trace-cmd           ext4_es_shrink_count #2592
         |
         --- *ext4_es_shrink_count*
[....]

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