Public bug reported:
Hi,
We've experienced crashes on machines running iptables using ipsets.
We could get a trace from the console on one of them (attached file
kernel-trace.txt).
On these machines, some ipset commands are automatically run to update the
sets, and/or to dump them (ipset restore, swap, delete ... / ipset save).
We strongly suspect the panic is happening due to a race when ipset updates
happen at the same time as a dump.
These machines are running xenial. Before the crash, they were on
4.4.0-116-generic #140-Ubuntu, but then rebooted into 4.4.0-135-generic
#161-Ubuntu.
I have an ipset save running in loops on one of these machines to try
and reproduce quicker.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: kernel-oops
** Attachment added: "kernel-trace.txt"
https://bugs.launchpad.net/bugs/1793753/+attachment/5191432/+files/kernel-trace.txt
** Description changed:
Hi,
We've experienced crashes on machines running iptables using ipsets.
We could get a trace from the console on one of them (attached file
kernel-trace.txt).
- On these machines, some ipset commands are automatically run to update the
sets, and/or to dump them (ipset restore / ipset swap / ipset save).
+ On these machines, some ipset commands are automatically run to update the
sets, and/or to dump them (ipset restore, swap, delete ... / ipset save).
We strongly suspect the panic is happening due to a race when ipset updates
happen at the same time as a dump.
These machines are running xenial. Before the crash, they were on
4.4.0-116-generic #140-Ubuntu, but then rebooted into 4.4.0-135-generic
#161-Ubuntu.
I have an ipset save running in loops on one of these machines to try
and reproduce quicker.
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https://bugs.launchpad.net/bugs/1793753
Title:
kernel panic - null pointer dereference on ipset operations
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