[Kernel-packages] [Bug 1919275] Re: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL
Brian, 7.2.8-1ubuntu1.20.10.2 fix addresses the issue. Thanks! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL Status in crash package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in crash source package in Bionic: Fix Committed Status in linux source package in Bionic: Invalid Status in crash source package in Focal: Fix Committed Status in linux source package in Focal: Fix Released Status in crash source package in Groovy: Fix Committed Status in linux source package in Groovy: Fix Released Bug description: [Impact] On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug has been addressed upstream and needed patches both in crash and kernel. Kernel patch : commit bbdbc11804ff0b4130e7550113b452e96a74d16e Author: Bhupesh Sharma Date: Thu May 14 00:22:37 2020 +0530 arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo Crash patch : commit 1c45cea02df7f947b4296c1dcaefa1024235ef10 Author: Bhupesh Sharma Date: Tue Jul 14 01:14:49 2020 +0530 arm64: Change tcr_el1_t1sz variable name to TCR_EL1_T1SZ Series affected : Kenrel : This affects Focal (5.4 kernel) and Groovy (5.8 kernel). Hirsute already contains the commit and kernels prior to 5.3 are not affected. Crash : The commit is already in Hirsute. Groovy, Focal and Bionic are affected. In case of Bionic the bug appears only if 5.4 hwe kernel is used. [Test Case] On an arm64 host which runs the affected releases and kernels after creating a crashdump try to open it with crash. It will fail with : crash: cannot determine VA_BITS_ACTUAL [Where problems could occur] Kernel patch : The kernel patch reads the appropriate cpu register and exports TCR_EL1.T1SZ variable in vmcoreinfo. Given that this is a simple operation and that this patch landed upstream in 5.9 and no regressions have been reported, it is safe to assume that the regression potential is minimal. Any potential problem would occur in vmcoreinfo since this is where TCR_EL1.T1SZ variable is exported. Crash patch : This patch renames tcr_el1_t1sz variable to TCR_EL1_T1SZ to be compatible with the kernel change above for crash to be able to read it. The regression potential is small and any problem would regard reading this variable. [Other] Workaround : This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1919275] Re: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL
Apologies for not getting back to this earlier, it looks like the verification was already done. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL Status in crash package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in crash source package in Bionic: Fix Committed Status in linux source package in Bionic: Invalid Status in crash source package in Focal: Fix Committed Status in linux source package in Focal: Fix Released Status in crash source package in Groovy: Fix Committed Status in linux source package in Groovy: Fix Released Bug description: [Impact] On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug has been addressed upstream and needed patches both in crash and kernel. Kernel patch : commit bbdbc11804ff0b4130e7550113b452e96a74d16e Author: Bhupesh Sharma Date: Thu May 14 00:22:37 2020 +0530 arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo Crash patch : commit 1c45cea02df7f947b4296c1dcaefa1024235ef10 Author: Bhupesh Sharma Date: Tue Jul 14 01:14:49 2020 +0530 arm64: Change tcr_el1_t1sz variable name to TCR_EL1_T1SZ Series affected : Kenrel : This affects Focal (5.4 kernel) and Groovy (5.8 kernel). Hirsute already contains the commit and kernels prior to 5.3 are not affected. Crash : The commit is already in Hirsute. Groovy, Focal and Bionic are affected. In case of Bionic the bug appears only if 5.4 hwe kernel is used. [Test Case] On an arm64 host which runs the affected releases and kernels after creating a crashdump try to open it with crash. It will fail with : crash: cannot determine VA_BITS_ACTUAL [Where problems could occur] Kernel patch : The kernel patch reads the appropriate cpu register and exports TCR_EL1.T1SZ variable in vmcoreinfo. Given that this is a simple operation and that this patch landed upstream in 5.9 and no regressions have been reported, it is safe to assume that the regression potential is minimal. Any potential problem would occur in vmcoreinfo since this is where TCR_EL1.T1SZ variable is exported. Crash patch : This patch renames tcr_el1_t1sz variable to TCR_EL1_T1SZ to be compatible with the kernel change above for crash to be able to read it. The regression potential is small and any problem would regard reading this variable. [Other] Workaround : This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1919275] Re: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL
Apologies for not getting back to this earlier, it looks like the verification was already done. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL Status in crash package in Ubuntu: New Status in linux package in Ubuntu: Incomplete Status in crash source package in Bionic: Fix Committed Status in linux source package in Bionic: Invalid Status in crash source package in Focal: Fix Committed Status in linux source package in Focal: Fix Released Status in crash source package in Groovy: Fix Committed Status in linux source package in Groovy: Fix Released Bug description: [Impact] On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug has been addressed upstream and needed patches both in crash and kernel. Kernel patch : commit bbdbc11804ff0b4130e7550113b452e96a74d16e Author: Bhupesh Sharma Date: Thu May 14 00:22:37 2020 +0530 arm64/crash_core: Export TCR_EL1.T1SZ in vmcoreinfo Crash patch : commit 1c45cea02df7f947b4296c1dcaefa1024235ef10 Author: Bhupesh Sharma Date: Tue Jul 14 01:14:49 2020 +0530 arm64: Change tcr_el1_t1sz variable name to TCR_EL1_T1SZ Series affected : Kenrel : This affects Focal (5.4 kernel) and Groovy (5.8 kernel). Hirsute already contains the commit and kernels prior to 5.3 are not affected. Crash : The commit is already in Hirsute. Groovy, Focal and Bionic are affected. In case of Bionic the bug appears only if 5.4 hwe kernel is used. [Test Case] On an arm64 host which runs the affected releases and kernels after creating a crashdump try to open it with crash. It will fail with : crash: cannot determine VA_BITS_ACTUAL [Where problems could occur] Kernel patch : The kernel patch reads the appropriate cpu register and exports TCR_EL1.T1SZ variable in vmcoreinfo. Given that this is a simple operation and that this patch landed upstream in 5.9 and no regressions have been reported, it is safe to assume that the regression potential is minimal. Any potential problem would occur in vmcoreinfo since this is where TCR_EL1.T1SZ variable is exported. Crash patch : This patch renames tcr_el1_t1sz variable to TCR_EL1_T1SZ to be compatible with the kernel change above for crash to be able to read it. The regression potential is small and any problem would regard reading this variable. [Other] Workaround : This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1926184] Re: locking/qrwlock: Fix ordering in queued_write_lock_slowpath()
I've been unable to reproduce the issue with the fixed kernel.
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-aws in Ubuntu.
https://bugs.launchpad.net/bugs/1926184
Title:
locking/qrwlock: Fix ordering in queued_write_lock_slowpath()
Status in linux package in Ubuntu:
In Progress
Status in linux-aws package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Status in linux-aws source package in Bionic:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux-aws source package in Focal:
Fix Released
Status in linux source package in Groovy:
Fix Committed
Status in linux-aws source package in Groovy:
Confirmed
Status in linux source package in Hirsute:
Fix Committed
Status in linux-aws source package in Hirsute:
Confirmed
Bug description:
[Impact]
* Out of order reads can fetch a NULL pointer causing a kernel crash. Affects
kernels from v4.15 to v5.11.
[Fix]
* commit 84a24bf8c52e ("locking/qrwlock: Fix ordering in
queued_write_lock_slowpath()")
* For Bionic, we also require an additional patch: commit fcfdfe30e324
("locking/barriers: Introduce smp_cond_load_relaxed() and
atomic_cond_read_relaxed()")
[Where problems could occur]
* This is quite a subtle bug. It is more prevalent on arm64. Regression
possibility seems quite low. The worst impact could be a minor performance
degradation.
* Kernels 4.15 / 5.4 / 5.8 / 5.11 were successfully built and booted
with this patch. Also, by using ftrace we could see that the changed
function was executed with success multiple times.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1926184/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1919275] [NEW] crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL
Public bug reported: On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. ** Affects: crash (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to crash in Ubuntu. https://bugs.launchpad.net/bugs/1919275 Title: crash utility fails on arm64 with cannot determine VA_BITS_ACTUAL Status in crash package in Ubuntu: New Bug description: On Ubuntu Bionic with the 5.4.0-1038-aws kernel the crash utility 7.2.8-1ubuntu0.18.04 fails with: crash: cannot determine VA_BITS_ACTUAL This bug/change in crash provides a workaround for 5.4+ https://github.com/crash-utility/crash/issues/52 kernels. While it appears as though it this was fixed it https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1858958 it still doesn't seem to work with a 5.4 kernel including. I also tested https://launchpad.net/ubuntu/+source/crash/7.2.8-1ubuntu0.18.04.1/+build/18807621/+files/crash_7.2.8-1ubuntu0.18.04.1_arm64.deb and it exhibits the same problem. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/crash/+bug/1919275/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1879214] Re: Package makedumpfile 1:1.6.7-1ubuntu2(arm64) failed to makedumpfile:calculate_plat_config: PAGE SIZE 0x1000 and VA Bits 47 not supported
Also impacts the bionic 18.04-aws kernel -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to makedumpfile in Ubuntu. https://bugs.launchpad.net/bugs/1879214 Title: Package makedumpfile 1:1.6.7-1ubuntu2(arm64) failed to makedumpfile:calculate_plat_config: PAGE SIZE 0x1000 and VA Bits 47 not supported Status in makedumpfile package in Ubuntu: Confirmed Status in makedumpfile source package in Focal: Confirmed Status in makedumpfile source package in Groovy: Confirmed Status in makedumpfile source package in Hirsute: Confirmed Bug description: [Impact] On arm64 and kernels 5.4+ makedumpfile fails. Upstream patches solve this bug : [PATCH 1/3] Use vmcoreinfo note in /proc/kcore for --mem-usage option https://github.com/makedumpfile/makedumpfile/commit/d8b701796f0491f2ac4b06c7a5b795c29399efab [PATCH 2/3] arm64: Make use of NUMBER(VA_BITS) in vmcoreinfo https://github.com/makedumpfile/makedumpfile/commit/67d0e1d68f28c567a704fd6b9b8fd696ad3df183 [PATCH 3/3] arm64: support flipped VA and 52-bit kernel VA https://github.com/makedumpfile/makedumpfile/commit/a0216b678a95f099a16172cc4a67ad5aa6a89583 [Test Case] OS: Ubuntu 20.04 LTS kernel: 5.4.0-21-generic arch:arm64 Description: When testing kdump on Ubuntu 20.04 LTS (arm64), makedumpfile fails. The test steps are as follows: # echo 1> / proc / sys / kernel / sysrq # echo c> / proc / sysrq-trigger The error logs are as follows: [ 26.599161] kdump-tools[653]: Starting kdump-tools: [ 26.612761] kdump-tools[659]: Starting kdump-tools: [ 26.628565] kdump-tools[659]: * running makedumpfile -c -d 31 /proc/vmcore /var/crash/2020050 [ 26.648621] kdump-tools[676]: * running makedumpfile -c -d 31 /proc/vmcore /var/crash/2020050 [ 26.668445] kdump-tools[676]: calculate_plat_config: PAGE SIZE 0x1000 and VA Bits 47 not supported [ 26.678199] kdump-tools[676]: get_machdep_info_arm64 [ 26.692518] kdump-tools[659]: get_machdep_info_arm64 [ 26.852221] hns3 :7d:00.0: get link status cmd failed -16 [ 94.351303] kdump-tools[659]: * kdump-tools: makedumpfile failed, * kdump-tools: saved vmcore in /var/crash/202005061048 [ 94.435510] kdump-tools[659]: * running makedumpfile --dump-dmesg /proc/vmcore /var/crash/202005061048/dmesg.202005061048 [ 94.457103] kdump-tools[688]: calculate_plat_config: PAGE SIZE 0x1000 and VA Bits 47 not supported [ 94.476228] kdump-tools[688]: get_machdep_info_arm64: Can't determine platform config values [ 94.485912] kdump-tools[688]: makedumpfile Failed. [ 94.500760] kdump-tools[659]: * kdump-tools: makedumpfile --dump-dmesg failed. dmesg content will be unavailable [ 94.520225] kdump-tools[659]: * kdump-tools: failed to save dmesg content in /var/crash/202005061048 [ 94.544205] kdump-tools[691]: Wed, 06 May 2020 10:49:42 -0400 [ 94.564597] kdump-tools[692]: Rebooting. [ 94.678709] reboot: Restarting systemlpc uart init Done [Regression Potential] Patch 1 : [PATCH 1/3] Use vmcoreinfo note in /proc/kcore for --mem-usage option removes get_elf_loads function this function was only used with --mem-usage option , since kernel commit kernel commit 23c85094fe18 (kernel versions >4.19) the information needed is in vmcoreinfo Any regression potential would affect the --mem-usage only Patch 2 : [PATCH 2/3] arm64: Make use of NUMBER(VA_BITS) in vmcoreinfo arm64 only make use of NUMBER(VA_BITS) in vmcoreinfo as the current way of guessing VA_BITS does not work on Linux 5.4 and later. Before this commit VA_BITS would be calculated in get_versiondep_info_arm64, however this way of calculation breaks after 5.4. This commit gets the VA_BITS from vmcoreinfo and as a safeguard it uses the old way of deriving VA_BITS only if reading from vmcoreinfo doesn't work. From the kernel side VA_BITS is in vmcoreinfo since kernel 4.12, F and later use later kernel so not great regression potentional and if any it would only affect arm64. Patch 3 : [PATCH 3/3] arm64: support flipped VA and 52-bit kernel VA arm64 only Linux 5.4 and later kernels for arm64 changed the kernel VA space arrangement and introduced 52-bit kernel VAs by merging branch commit b333b0ba2346. Support 5.9+ kernels with vmcoreinfo entries and 5.4+ kernels with best guessing. This patch makes adjustemnt to properly calculate vabits_actual, max_physmem_bits, page_offset Any regression potential would affect only arm64 and the calculation of the above variables. [Other] For H only the 3 commits are needed and they cherry-pick. For G and F the 3rd commit does not apply and an extra commit is needed : commit da0d25ffa585c9a1adb94562c815daa393b1ee5e [PATCH] arm64: Add support for ARMv8.2-LPA (52-bit PA support) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/makedumpfile/+bug/1879214/+subscriptions --
