apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1799237/+attachment/5204643/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1799237/+attachment/5204641/+files/CurrentDmesg.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1799237/+attachment/5204646/+files/ProcInterrupts.txt
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apport information
** Attachment added: "Lspci.txt"
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Title:
mpro
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** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1799237/+attachment/5204649/+files/UdevDb.txt
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Title:
mp
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** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1799237/+attachment/5204650/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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apport information
** Attachment added: "ProcModules.txt"
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apport information
** Attachment added: "ProcEnviron.txt"
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apport information
** Tags added: apport-collected
** Description changed:
I have a file located on ext4 mounted with "dax". When I call mmap on that
file with protection flag different than PROT_NONE and pass the returned
address to mprotect(..., PROT_NONE) it fails with:
mprotect: Permis
apport information
** Attachment added: "PulseList.txt"
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Titl
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** Attachment added: "ProcCpuinfoMinimal.txt"
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This bug was not present in the following kernel: 4.15.0-20-generic
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Title:
mprotect fails on ext4 with dax
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I have tested the following upstream kernels and mprotect works fine on all of
them:
4.15.17-041517-generic
4.15.18-041518-generic
4.19.0-041900-generic
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It turns out that this issue is only present for certain mapping lengths.
If I run the program, which I attached to the bug report, with size>=2M,
mprotect succeeds.
I have also tested this on device dax, and the results depend on alignment.
For 2M alignment, everything works fine, for 4k alignm
When I install kernel from package I have some problems with pmem
emulation and I can't really test this. Here is a simple script which
can be used to reproduce the problem (assuming you have pmem emulation,
e.g. using memmap and ndctl installed):
sudo umount /dev/pmem0
sudo ndctl create-namespace
Eerything I described in previous comment was observed on Ubuntu kernel
(4.15.0-34). It worked fine on upstream and on ubuntu 4.15.0-20 so we
can still consider this a regression.
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https:/
I performed bisect on my own and it seems that following commit causes the
problem:
1920d4a1d4ff27ebfd34a99eca67c3c470c8c524 (x86/speculation/l1tf: Invert all not
present mappings).
In upstream kernel there is a commit fixing this:
f19f5c49bbc3ffcc9126cc245fc1b24cc29f4a37
The mprotect issue is
The problem is still present on kernel 4.15.0-43. Do you have any plans
to fix that?
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Title:
mprotect fails on ext4 with dax
To manage notificat
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