** Tags removed: bugnameltc-192677 severity-high
** Tags added: bugnameltc-194783 severity-medium
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Title:
IPv6 TCP in reuseport_bpf_cpu from
Hey Krzysztof and Thadeu,
Thanks for the follow-up and the info!
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Title:
IPv6 TCP in reuseport_bpf_cpu from ubuntu_kernel_selftests/net crash
Sent request upstream:
https://lore.kernel.org/linuxppc-dev/YUpIqytZqpohq4EM@mussarela/T/#u
I will ping some folks for some help there.
Cascardo.
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Upstream report: https://lore.kernel.org/linuxppc-
dev/YUpIqytZqpohq4EM@mussarela/T/#u
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Title:
IPv6 TCP in reuseport_bpf_cpu from
About this latest comment. So, CPU #0 has crashed at pc =
c00813566eb8, its ctr and r12 match, same as usual, it was called by
__bpf_prog_run_save_cb as the BPF JITed program. Dumping the program
from CPU #0 perspective, it has traps at that address.
It turns out the JIT fills up a whole page
9f:mon> di c00813566000 1000
c00813566000 7fe8 trap
...
c00813566eb8 6000 nop
...
c00813566ec0 7c0802a6 mflrr0
c00813566ec4 f8010010 std r0,16(r1)
c00813566ec8 f821ffa1 stdur1,-96(r1)
c00813566ecc 3d80c000 lis
Since this is leading bug, I will copy here also list of
reproducible environments from the other bug:
Also reproduced on (huggins, POWER8NVL, 8335-GTB):
* 5.11.0-20-generic mainline (v5.11.22).
* 5.13.17-051317-generic mainline fails even on first run of reuseport_bpf_cpu
test.
*
I will mark the other 2 bugs as a dup of this one, due to the fact that
Thadeu has provided some further investigations here.
** This bug is no longer a duplicate of bug 1909286
ubuntu_kernel_selftest will be interrupted with the reuseport_bpf_cpu /
reuseport_bpf_numa test in net (BUG: Unable
*** This bug is a duplicate of bug 1909286 ***
https://bugs.launchpad.net/bugs/1909286
I tested that when reuseport_bpf_cpu did not consider the last CPU, the
one that has been hotplugged, it didn't crash. It didn't set affinity to
that CPU, didn't even allocate socket for it.
Then, I
*** This bug is a duplicate of bug 1909286 ***
https://bugs.launchpad.net/bugs/1909286
Krzysztof mentioned that this has been found on 5.14 as well. Using a
system he lent me (huggins), I also tested with the commit that changed
the call to use CTR and it failed as well. But it always failed
*** This bug is a duplicate of bug 1909286 ***
https://bugs.launchpad.net/bugs/1909286
Thadeu, It is present on v5.13 (tested v5.13.17).
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*** This bug is a duplicate of bug 1909286 ***
https://bugs.launchpad.net/bugs/1909286
** This bug has been marked a duplicate of bug 1909286
ubuntu_kernel_selftest will be interrupted with the reuseport_bpf_cpu /
reuseport_bpf_numa test in net (BUG: Unable to handle kernel instruction
Test kernel at:
https://kernel.ubuntu.com/~cascardo/lp1927076_1.tar
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Title:
IPv6 TCP in reuseport_bpf_cpu from ubuntu_kernel_selftests/net
I was looking at latest changes since 5.11 to powerpc64 BPF JIT and
found the following commit:
commit 20ccb004bad659c186f9091015a956da220d615d
Author: Naveen N. Rao
Date: Wed Jun 9 14:30:24 2021 +0530
powerpc/bpf: Use bctrl for making function calls
blrl corrupts the link stack.
This is also failing with focal/linux on the node dryden.
The latest result is from 5.4.0-85.95, which is stopping around this
test:
04:57:26 DEBUG| [stdout] # selftests: net: reuseport_bpf_cpu
[...]
04:57:26 DEBUG| [stdout] # IPv6 UDP
[...]
04:57:26 DEBUG| [stdout] # send cpu 145,
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu Hirsute)
Status: New => Confirmed
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Thanks Patricia for tests. It looks it was seen before: lp:1909286. I
will mark it as duplicate.
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Title:
IPv6 TCP in reuseport_bpf_cpu from
Cascardo, I was trying to reproduce the issue as Po-Hsu Lin has mentioned (#3),
but the hotplug leaves the system in the same state (shows this output):
```
./cpu-hotplug/cpu-on-off-test.sh
pid 21291's current affinity mask:
pid 21291's new affinity mask: 1
CPU
Hi, Patricia.
Can you clarify if you always need to run the hotplug test before
reuseport_bpf_cpu in order to reproduce? I wonder what is the state that
the hotplug test leaves the system in? How is it being run? The makefile
runs it with the -a option, which in the systems I have available would
Krzysztof, you were on a PowerVM LPAR (P8LPAR05), just let me know if
there's anything that need to be tested
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Title:
IPv6 TCP in
** Attachment added: "lscpu_entei"
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1927076/+attachment/5524453/+files/lscpu_entei
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Title:
Also re-ran on
`entei` it is also a POWER8 (8335-GTA) with Hirsute latest kernel
(5.11.0-34-generic)
hit the same error - second run of `reuseport_bpf_cpu`:
```
[ 232.349547] Oops: Exception in kernel mode, sig: 4 [#1]
[ 232.349647] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
Ok I've re-ran the test with latest kernel versions on the same systems:
`thiel` (8001-22C) with focal-hwe (5.11.0-34-generic):
```
[ 3255.763649] Oops: Exception in kernel mode, sig: 5 [#1]
[ 3255.763723] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
```
And
`gulpin` (8335-GTA) with
** Attachment added: "lscpu_gulpin"
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1927076/+attachment/5524415/+files/lscpu_gulpin
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** Attachment added: "lscpu_thiel"
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1927076/+attachment/5524414/+files/lscpu_thiel
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Title:
Can you repeat tests with latest kernels? I could not reproduce it on Focal
with following configurations:
1. Power8: P8LPAR05 MAAS
2. Power9: QEMU with 4 or 128 CPUs (and 4 GB of RAM)
Tested kernels:
F/5.4.0-84-generic
F/5.11.0-34-generic
Tried steps:
1. Freshly boot machine.
2. Log in via
Po-Hsu Lin,
Thanks for the info.
I was able to reproduce the issue on other 2 Power8 servers, but just running
the `reuseport_bpf_cpu test` more than once (as you mentioned on comment#3).
I've tested this with focal-hwe (Linux thiel 5.11.0-27-generic) and hirsute
(5.11.0-31-generic).
steps:
This issue can be reproduced on P8 node entei with:
* F-5.4 (5.4.0-81-generic)
* F-5.11 (5.11.0-27-generic #29~20.04.1-Ubuntu)
* H-5.11 (5.11.0-31-generic)
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** Changed in: ubuntu-power-systems
Status: Incomplete => Confirmed
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Title:
IPv6 TCP in reuseport_bpf_cpu from
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
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Title:
IPv6 TCP in reuseport_bpf_cpu from
Hi Andrew,
I just retest this manually on node entei with the steps in comment #3,
and this issue can be reproduced (system gets reboot) with a different
message from the ipmi console.
[ 417.696448] BUG: Unable to handle kernel instruction fetch (NULL pointer?)
[ 417.696522] Faulting
Since the groovy 5.8 kernel is now EOL, can this be reproduced with the
5.11 kernel?
Or can we close this bug out?
** Changed in: ubuntu-power-systems
Status: New => Incomplete
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** Tags added: architecture-ppc64le bugnameltc-192677 severity-high
targetmilestone-inin---
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Title:
IPv6 TCP in reuseport_bpf_cpu from
** Also affects: ubuntu-power-systems
Importance: Undecided
Status: New
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Title:
IPv6 TCP in reuseport_bpf_cpu from
Remove the kqa-blocker tag, as it can be reproduced with the kernel in
updates.
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Title:
IPv6 TCP in reuseport_bpf_cpu from
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