Public bug reported:
I've been experimenting with netfilter's queue target and transparent
redirection of IPv4/TCP connections on Ubuntu Jammy.
Initiating excessive connection requests from one source IP address to one
IP/port, I could invoke
a soft lockup on a server host with the latest linux-
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/1911917
Title:
Kernel general protection fault when using NFQUEUE i
I could not reproduce the issue with the following newer kernels on
Bionic:
- linux-image-5.4.0-99-generic
- linux-image-5.4.0-80-generic
- linux-image-5.4.0-70-generic
Kernel linux-image-5.4.0-65-generic still crashing, so this issue has
been fixed between 5.4.0-65 and 5.4.0-70.
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You receive
Public bug reported:
When a packet is forwarded through an Ubuntu Focal host with kernel
version 5.4.0-62-generic and NFQUEUE target is used in mangle PREROUTING
and POSTROUTING, the kernel crashes.
[ 856.055991] general protection fault: [#1] SMP PTI
[ 856.151292] CPU: 0 PID: 722 Comm: nf
** Attachment added: "KernelCrash file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1911917/+attachment/5453516/+files/linux-image-5.4.0-62-generic-202101151448.crash
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** Attachment added: "iptables rules"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1911917/+attachment/5453517/+files/iptables.conf.nfq
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** Attachment removed: "iptables rules"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1911917/+attachment/5453517/+files/iptables.conf.nfq
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** Description changed:
When a packet is forwarded through an Ubuntu Focal host with kernel
version 5.4.0-62-generic and NFQUEUE target is used in mangle PREROUTING
- and POSTROUTING, the kernel crashes.
+ and POSTROUTING, the kernel crashes. Current Focal linux-generic-
+ hwe-20.04 kernel (5.
Hi Cascardo,
thank you your quick response.
- Sorry for the confusion, nfq-cpp was a dummy C++ test code which did
what ./print_and_accept.py script do, listen and accept all packages.
- I could not reproduce the crash neither with localhost connections
(without routing) or routing through veth
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