Bionic SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-October/095980.html
** Description changed:
+ == SRU Justification ==
+ IBM is requesting this commit in Bionic. It fixes a regression
+ introduced by upstream commit 4bb3c7a020.
+
+ Without this patch, package installation segfaults inside debian chroot
+ env in P9 KVM guest with HTM enabled.
+
+ The fix has already landed in Cosmic master-next.
+
+ == Fix ==
+ f14040bca892 ("KVM: PPC: Book3S HV: Fix guest r11 corruption with POWER9 TM
workarounds")
+
+ == Regression Potential ==
+ Low. This commit fixes an existing regrssion and is specific to powerpc. It
has been cc'd to
+ upstream stable, so has had additional upstream review.
+
+ == Test Case ==
+ A test kernel was built with this patch and tested by the original bug
reporter.
+ The bug reporter states the test kernel resolved the bug.
+
+
+
+
== Comment: #0 - Satheesh Rajendran <[email protected]> - 2018-09-11
04:10:09 ==
---Problem Description---
package installation segfaults inside debian chroot env in P9 KVM guest with
HTM enabled
-
+
---Additional Hardware Info---
FW with tm-suspend-mode enabled
#cd /sys/firmware/devicetree/base/ibm,opal/fw-features/
#ls -1 tm-suspend-mode
enabled
name
phandle
-
+
qemu-kvm 1:2.11+dfsg-1ubuntu7.4
-
- Machine Type = Power9 DD2.2
-
+
+ Machine Type = Power9 DD2.2
+
---Steps to Reproduce---
- 1. Boot a P9 KVM guest Ubuntu 18.04 (with cap-htm=on, bydefault it is on)
+ 1. Boot a P9 KVM guest Ubuntu 18.04 (with cap-htm=on, bydefault it is on)
tried with upstream kernel aswell(same results)
create tap device in host
# tunctl -t tap1 -u `whoami`;brctl addif virbr0 tap1;ifconfig tap1 up
#qemu-system-ppc64 -enable-kvm -M pseries -m 8192 -smp 4 -drive
file=/home/sath/ubuntu-18.04-ppc64le.qcow2,format=qcow2,if=none,id=drive-scsi0
-device virtio-scsi-pci,id=drive-scsi0 -device scsi-hd,drive=drive-scsi0
-serial mon:stdio -enable-kvm -vga none -nographic -kernel
/home/sath/vmlinux_4.19 -append root=/dev/sda2 rw console=tty0
console=ttyS0,115200 init=/sbin/init initcall_debug -netdev
tap,id=mynet1,ifname=tap1,script=no,downscript=no -device
virtio-net,netdev=mynet1,mac=52:55:00:d1:55:42
run dhclient inside guest.
2. # mkdir -p stretch
# debootstrap stretch /stretch http://httpredir.debian.org/debian
# chroot /stretch
/# apt-get update && apt-get install -y make gcc ruby python
...
[ 32.029474] random: crng init done
[ 32.029477] random: 7 urandom warning(s) missed due to ratelimiting
[ 500.300835] dpkg-deb[8704]: segfault (11) at c0000000000037fa nip
7fffac2d098c lr 7fffac2d08c4 code 1 in libc-2.24.so[7fffac170000+190000]
- [ 500.300863] dpkg-deb[8704]: code: 48000028 eb090010 2eb80000 4096006c
419e0074 85270004 394a0001 794a0020
- [ 500.300881] dpkg-deb[8704]: code: 71280001 408200a0 1d2a0018 7d2b4a14
<a1090006> 2ea80000 40960010 e9090008
+ [ 500.300863] dpkg-deb[8704]: code: 48000028 eb090010 2eb80000 4096006c
419e0074 85270004 394a0001 794a0020
+ [ 500.300881] dpkg-deb[8704]: code: 71280001 408200a0 1d2a0018 7d2b4a14
<a1090006> 2ea80000 40960010 e9090008
-
---uname output---
4.15.0-34,4.19.0-rc3
-
+
---Debugger---
A debugger is not configured
-
- Contact Information = [email protected]
-
- Userspace tool common name:
- KVM Guest: Ubuntu GLIBC 2.27-3ubuntu1) stable release version 2.27,
- Chroot inside KVM Guest: Debian GLIBC 2.24-11+deb9u3) stable release version
2.24
+ Contact Information = [email protected]
+
+ Userspace tool common name:
+
+ KVM Guest: Ubuntu GLIBC 2.27-3ubuntu1) stable release version 2.27,
+ Chroot inside KVM Guest: Debian GLIBC 2.24-11+deb9u3) stable release version
2.24
Userspace rpm:
- KVM Guest: Ubuntu GLIBC 2.27-3ubuntu1) stable release version 2.27,
- Chroot inside KVM Guest: Debian GLIBC 2.24-11+deb9u3) stable release version
2.24
-
- The userspace tool has the following bit modes: both
+ KVM Guest: Ubuntu GLIBC 2.27-3ubuntu1) stable release version 2.27,
+ Chroot inside KVM Guest: Debian GLIBC 2.24-11+deb9u3) stable release version
2.24
- Userspace tool obtained from project website: na
-
- *Additional Instructions for [email protected]:
+ The userspace tool has the following bit modes: both
+
+ Userspace tool obtained from project website: na
+
+ *Additional Instructions for [email protected]:
-Post a private note with access information to the machine that the bug is
occuring on.
-Attach ltrace and strace of userspace application.
-
- So latest update taken from
https://github.ibm.com/powercloud/icp-ppc64le/issues/470
+ So latest update taken from https://github.ibm.com/powercloud/icp-
+ ppc64le/issues/470
was able to recreate segfault using TM test cases
/linux/tools/testing/selftests/powerpc/tm
# ./tm-vmxcopy
test: tm_vmxcopy
tags: git_version:v4.19-rc3-0-g11da3a7f84f1-dirty
!! child died by signal 11
failure: tm_vmxcopy
this particular test on being run gets a signal 11
[267132.434651] tm-vmxcopy[641]: unhandled signal 11 at 0000000000000001 nip
0000000104ba122c lr 0000000104ba11e4 code 30001
[267253.708795] tm-vmxcopy[7861]: unhandled signal 11 at 0000000000000001 nip
000000012a31122c lr 000000012a3111e4 code 30001
[267385.064533] tm-vmxcopy[13314]: unhandled signal 11 at 0000000000000001
nip 00000001235f122c lr 00000001235f11e4 code 30001
-
== Comment: #12 - Michael Neuling <[email protected]> - 2018-09-13
00:34:16 ==
Fixes r11 corruption.
== Comment: #14 - Satheesh Rajendran <[email protected]> - 2018-09-13
03:15:46 ==
Tested with above patch on KVM host and reported issue is fixed.
# git log -1
commit 72664e47565f5de0a1fead1d9111c97b9b537713 (HEAD -> fix)
Author: Michael Neuling <[email protected]>
Date: Thu Sep 13 15:33:47 2018 +1000
- KVM: PPC: Book3S HV: Fix guest r11 corruption with POWER9 TM workarounds
-
- When we come into the softpatch handler (0x1500), we use r11 to store
- the HSRR0 for later use by the denorm handler.
-
- We also use the softpatch handler for the TM workarounds for
- POWER9. Unfortunately, in kvmppc_interrupt_hv we later store r11 out
- to the vcpu assuming it's still what we got from userspace.
-
- This causes r11 to be corrupted in the VCPU and hence when we restore
- the guest, we get a corrupted r11. We've seen this when running TM
- tests inside guests on P9.
-
- This fixes the problem by only touching r11 in the denorm case.
-
- Fixes: 4bb3c7a020 ("KVM: PPC: Book3S HV: Work around transactional memory
bugs in POWER9")
- Cc: <[email protected]> # 4.17+
- Test-by: Suraj Jitindar Singh <[email protected]>
- Reviewed-by: Paul Mackerras <[email protected]>
- Signed-off-by: Michael Neuling <[email protected]>
+ KVM: PPC: Book3S HV: Fix guest r11 corruption with POWER9 TM
+ workarounds
+
+ When we come into the softpatch handler (0x1500), we use r11 to store
+ the HSRR0 for later use by the denorm handler.
+
+ We also use the softpatch handler for the TM workarounds for
+ POWER9. Unfortunately, in kvmppc_interrupt_hv we later store r11 out
+ to the vcpu assuming it's still what we got from userspace.
+
+ This causes r11 to be corrupted in the VCPU and hence when we restore
+ the guest, we get a corrupted r11. We've seen this when running TM
+ tests inside guests on P9.
+
+ This fixes the problem by only touching r11 in the denorm case.
+
+ Fixes: 4bb3c7a020 ("KVM: PPC: Book3S HV: Work around transactional memory
bugs in POWER9")
+ Cc: <[email protected]> # 4.17+
+ Test-by: Suraj Jitindar Singh <[email protected]>
+ Reviewed-by: Paul Mackerras <[email protected]>
+ Signed-off-by: Michael Neuling <[email protected]>
Regards,
-Satheesh
http://patchwork.ozlabs.org/patch/969256/
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https://bugs.launchpad.net/bugs/1792501
Title:
[Ubuntu18.04][Power9][DD2.2]package installation segfaults inside
debian chroot env in P9 KVM guest with HTM enabled (kvm)
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