It seems one of the RAM modules in that machine degraded over time -
while memtest86 found no problems in the past, now errors are discovered
within seconds.
It's unclear when the module became faulty, but it's quite plausible
that the observed kernel panics were caused by this and that there's
The issue started after upgrading from 17.10 to 18.04. However, at the
same time I also upgraded the CPU from an AMD A12-9800 to the AMD Ryzen
7 2700 (with the rest of the system remaining unchanged). I don't have
the older CPU anymore, so I cannot change back for test purposes. Given
the
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1779063
Title:
Occasional kernel panic on shutdown in ext4 code
apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157450/+files/ProcModules.txt
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apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157445/+files/Lspci.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157447/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcCpuinfoMinimal.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157448/+files/ProcCpuinfoMinimal.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157449/+files/ProcInterrupts.txt
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apport information
** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157444/+files/IwConfig.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157446/+files/Lsusb.txt
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apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157443/+files/CurrentDmesg.txt
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apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1779063/+attachment/5157442/+files/CRDA.txt
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apport information
** Tags added: apport-collected bionic
** Description changed:
Occasionally (about once every three weeks) my machine experiences a
kernel panic somewhere in the ext4 code on shutdown (and only on
shutdown).
Ubuntu Version: 18.04, x86-64
Platform: AMD Ryzen R7
add "linux" as affected package.
** Package changed: ubuntu => linux (Ubuntu)
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Title:
Occasional kernel panic on shutdown in ext4
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