** Attachment added: "test-loop.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847340/+attachment/5524208/+files/test-loop.sh
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** Attachment added: "fstests-check-logs.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847340/+attachment/5524207/+files/fstests-check-logs.sh
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Attaching the scripts used for testing
(run/check xfstests, and run stress-ng)
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https://bugs.launchpad.net/bugs/1847340
Title:
ext4 journal recovery fails w/ data=journal + mmap
To
** Attachment added: "fstests-run.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847340/+attachment/5524206/+files/fstests-run.sh
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Test results with stress-ng.
The original kernels hit the issue (very often on Bionic, less often on Focal.)
The modified kernels don't (in 2x the number of runs on both Bionic and Focal.)
Number of tests (stress-ng + crash + mount) that mount PASSED or FAILED (ie,
problem was hit.)
---
Regression test results with (x)fstests.
Bionic, data=journal: no regression.
Original:
---
$ ./fstests-check-logs.sh orig-journal/xfstests.log*
Kernel version: 5.4.0-84-generic #94-Ubuntu
- Number of Runs: 10
- Always fail (failed every time)
10 ext4/024
10 ext4/034
10
Regression test results with (x)fstests.
Focal, data=ordered: no regression.
Original:
---
$ ./fstests-check-logs.sh orig-ordered/xfstests.log*
Kernel version: 5.4.0-84-generic #94-Ubuntu
- Number of Runs: 10
- Always fail (failed every time)
10 ext4/024
10 ext4/034
10 ext4/045
Regression test results with (x)fstests.
Bionic, data=journal: no regression.
Original:
---
$ ./fstests-check-logs.sh orig-journal/xfstests.log*
Kernel version: 4.15.0-156-generic #163-Ubuntu
- Number of Runs: 10
- Always fail (failed every time)
10 ext4/045
10 generic/082
10
Regression test results with (x)fstests.
Bionic, data=ordered: no regression.
Original:
---
$ ./fstests-check-logs.sh orig-ordered/xfstests.log*
Kernel version: 4.15.0-156-generic #163-Ubuntu
- Number of Runs: 10
- Always fail (failed every time)
10 ext4/045
10 generic/044
10
** Description changed:
+ [Impact]
+
+ With mmap()ed files on ext4's data journaling it's possible to change
+ a mapped page's buffers contents during their jbd2 transaction commit
+ (as currently nothing prevents/blocks the write access at that time.)
+
+ This might happen between the buffers
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Bionic)
Assignee:
** Changed in: linux (Ubuntu Eoan)
Status: Incomplete => Won't Fix
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Title:
ext4 journal recovery fails w/ data=journal + journal_checksum
** Changed in: linux (Ubuntu Disco)
Status: Incomplete => Won't Fix
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Title:
ext4 journal recovery fails w/ data=journal +
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: Confirmed
** Also affects: linux (Ubuntu Ff-series)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance:
Upstream thread: https://lists.openwall.net/linux-ext4/2019/08/30/1
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Title:
ext4 journal recovery fails w/ data=journal + journal_checksum +
And the precursor to that the upstream thread in comment #1:
https://www.spinics.net/lists/linux-fsdevel/msg151486.html
And here's a captured filesystem image (referenced in above thread):
https://people.canonical.com/~dannf/md2.e2ic.qcow2
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