[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
This bug was fixed in the package linux - 4.18.0-20.21 --- linux (4.18.0-20.21) cosmic; urgency=medium * CVE-2018-12126 // CVE-2018-12127 // CVE-2018-12130 - Documentation/l1tf: Fix small spelling typo - x86/cpu: Sanitize FAM6_ATOM naming - kvm: x86: Report STIBP on GET_SUPPORTED_CPUID - locking/atomics, asm-generic: Move some macros from to a new file - tools include: Adopt linux/bits.h - x86/msr-index: Cleanup bit defines - x86/speculation: Consolidate CPU whitelists - x86/speculation/mds: Add basic bug infrastructure for MDS - x86/speculation/mds: Add BUG_MSBDS_ONLY - x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests - x86/speculation/mds: Add mds_clear_cpu_buffers() - x86/speculation/mds: Clear CPU buffers on exit to user - x86/kvm/vmx: Add MDS protection when L1D Flush is not active - x86/speculation/mds: Conditionally clear CPU buffers on idle entry - x86/speculation/mds: Add mitigation control for MDS - x86/speculation/mds: Add sysfs reporting for MDS - x86/speculation/mds: Add mitigation mode VMWERV - Documentation: Move L1TF to separate directory - Documentation: Add MDS vulnerability documentation - x86/speculation/mds: Add mds=full,nosmt cmdline option - x86/speculation: Move arch_smt_update() call to after mitigation decisions - x86/speculation/mds: Add SMT warning message - x86/speculation/mds: Fix comment - x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off - x86/speculation/mds: Add 'mitigations=' support for MDS * CVE-2017-5715 // CVE-2017-5753 - s390/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5753 // CVE-2017-5754 // CVE-2018-3639 - powerpc/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5754 // CVE-2018-3620 // CVE-2018-3639 // CVE-2018-3646 - cpu/speculation: Add 'mitigations=' cmdline option - x86/speculation: Support 'mitigations=' cmdline option * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log linux (4.18.0-19.20) cosmic; urgency=medium * linux: 4.18.0-19.20 -proposed tracker (LP: #1826171) * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log * autopkgtests run too often, too much and don't skip enough (LP: #1823056) - [Debian] Set +x on rebuild testcase. - [Debian] Skip rebuild test, for regression-suite deps. - [Debian] Make ubuntu-regression-suite skippable on unbootable kernels. - [Debian] make rebuild use skippable error codes when skipping. - [Debian] Only run regression-suite, if requested to. * CVE-2017-5753 - s390/keyboard: sanitize array index in do_kdsk_ioctl - drm/bufs: Fix Spectre v1 vulnerability - drivers/misc/sgi-gru: fix Spectre v1 vulnerability - ipv4: Fix potential Spectre v1 vulnerability - aio: fix spectre gadget in lookup_ioctx - ALSA: emux: Fix potential Spectre v1 vulnerabilities - ALSA: pcm: Fix potential Spectre v1 vulnerability - ip6mr: Fix potential Spectre v1 vulnerability - ALSA: rme9652: Fix potential Spectre v1 vulnerability - ALSA: emu10k1: Fix potential Spectre v1 vulnerabilities - KVM: arm/arm64: vgic: Fix off-by-one bug in vgic_get_irq() - drm/ioctl: Fix Spectre v1 vulnerabilities - net: core: Fix Spectre v1 vulnerability - phonet: af_phonet: Fix Spectre v1 vulnerability - nfc: af_nfc: Fix Spectre v1 vulnerability - can: af_can: Fix Spectre v1 vulnerability - net: Revert recent Spectre-v1 patches. - char/mwave: fix potential Spectre v1 vulnerability - applicom: Fix potential Spectre v1 vulnerabilities - ipmi: msghandler: Fix potential Spectre v1 vulnerabilities - powerpc/ptrace: Mitigate potential Spectre v1 - cfg80211: prevent speculation on cfg80211_classify8021d() return - ALSA: rawmidi: Fix potential Spectre v1 vulnerability - ALSA: seq: oss: Fix Spectre v1 vulnerability * NULL pointer dereference when using z3fold and zswap (LP: #1814874) - z3fold: fix possible reclaim races * The Realtek card reader does not enter PCIe 1.1/1.2 (LP: #1825487) - misc: rtsx: Enable OCP for rts522a rts524a rts525a rts5260 - SAUCE: misc: rtsx: Fixed rts5260 power saving parameter and sd glitch * headset-mic doesn't work on two Dell laptops. (LP: #1825272) - ALSA: hda/realtek - add two more pin configuration sets to quirk table * CVE-2018-16884 - sunrpc: use SVC_NET() in svcauth_gss_* functions - sunrpc: use-after-free in svc_process_common() * AMD Rome : Minimal support patches (LP: #1816669) - x86: irq_remapping: Move irq remapping mode enum - iommu/amd: Add support for higher 64-bit IOMMU Control Register - iommu/amd: Add support for IOMMU XT mode * sky2 ethernet card don't work after returning from suspension (LP: #1798921) - sky2: Increase D3 delay again * CVE-2019-9500 - brcmfmac: assure
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
This bug was fixed in the package linux - 4.15.0-50.54 --- linux (4.15.0-50.54) bionic; urgency=medium * CVE-2018-12126 // CVE-2018-12127 // CVE-2018-12130 - Documentation/l1tf: Fix small spelling typo - x86/cpu: Sanitize FAM6_ATOM naming - kvm: x86: Report STIBP on GET_SUPPORTED_CPUID - locking/atomics, asm-generic: Move some macros from to a new file - tools include: Adopt linux/bits.h - x86/msr-index: Cleanup bit defines - x86/speculation: Consolidate CPU whitelists - x86/speculation/mds: Add basic bug infrastructure for MDS - x86/speculation/mds: Add BUG_MSBDS_ONLY - x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests - x86/speculation/mds: Add mds_clear_cpu_buffers() - x86/speculation/mds: Clear CPU buffers on exit to user - x86/kvm/vmx: Add MDS protection when L1D Flush is not active - x86/speculation/mds: Conditionally clear CPU buffers on idle entry - x86/speculation/mds: Add mitigation control for MDS - x86/speculation/mds: Add sysfs reporting for MDS - x86/speculation/mds: Add mitigation mode VMWERV - Documentation: Move L1TF to separate directory - Documentation: Add MDS vulnerability documentation - x86/speculation/mds: Add mds=full,nosmt cmdline option - x86/speculation: Move arch_smt_update() call to after mitigation decisions - x86/speculation/mds: Add SMT warning message - x86/speculation/mds: Fix comment - x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off - x86/speculation/mds: Add 'mitigations=' support for MDS * CVE-2017-5715 // CVE-2017-5753 - s390/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5753 // CVE-2017-5754 // CVE-2018-3639 - powerpc/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5754 // CVE-2018-3620 // CVE-2018-3639 // CVE-2018-3646 - cpu/speculation: Add 'mitigations=' cmdline option - x86/speculation: Support 'mitigations=' cmdline option * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log linux (4.15.0-49.53) bionic; urgency=medium * linux: 4.15.0-49.53 -proposed tracker (LP: #1826358) * Backport support for software count cache flush Spectre v2 mitigation. (CVE) (required for POWER9 DD2.3) (LP: #1822870) - powerpc/64s: Add support for ori barrier_nospec patching - powerpc/64s: Patch barrier_nospec in modules - powerpc/64s: Enable barrier_nospec based on firmware settings - powerpc: Use barrier_nospec in copy_from_user() - powerpc/64: Use barrier_nospec in syscall entry - powerpc/64s: Enhance the information in cpu_show_spectre_v1() - powerpc/64: Disable the speculation barrier from the command line - powerpc/64: Make stf barrier PPC_BOOK3S_64 specific. - powerpc/64: Add CONFIG_PPC_BARRIER_NOSPEC - powerpc/64: Call setup_barrier_nospec() from setup_arch() - powerpc/64: Make meltdown reporting Book3S 64 specific - powerpc/lib/code-patching: refactor patch_instruction() - powerpc/lib/feature-fixups: use raw_patch_instruction() - powerpc/asm: Add a patch_site macro & helpers for patching instructions - powerpc/64s: Add new security feature flags for count cache flush - powerpc/64s: Add support for software count cache flush - powerpc/pseries: Query hypervisor for count cache flush settings - powerpc/powernv: Query firmware for count cache flush settings - powerpc/fsl: Add nospectre_v2 command line argument - KVM: PPC: Book3S: Add count cache flush parameters to kvmppc_get_cpu_char() - [Config] Add CONFIG_PPC_BARRIER_NOSPEC * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log * autopkgtests run too often, too much and don't skip enough (LP: #1823056) - [Debian] Set +x on rebuild testcase. - [Debian] Skip rebuild test, for regression-suite deps. - [Debian] Make ubuntu-regression-suite skippable on unbootable kernels. - [Debian] make rebuild use skippable error codes when skipping. - [Debian] Only run regression-suite, if requested to. * bionic: fork out linux-snapdragon into its own topic kernel (LP: #1820868) - [Packaging] remove arm64 snapdragon from getabis - [Config] config changes for snapdragon split - packaging: arm64: disable building the snapdragon flavour - [Packaging] arm64: Drop snapdragon from kernel-versions * CVE-2017-5753 - KVM: arm/arm64: vgic: fix possible spectre-v1 in vgic_get_irq() - media: dvb_ca_en50221: prevent using slot_info for Spectre attacs - sysvipc/sem: mitigate semnum index against spectre v1 - libahci: Fix possible Spectre-v1 pmp indexing in ahci_led_store() - s390/keyboard: sanitize array index in do_kdsk_ioctl - arm64: fix possible spectre-v1 write in ptrace_hbp_set_event() - KVM: arm/arm64: vgic: Fix possible spectre-v1 write in vgic_mmio_write_apr() - pktcdvd: Fix possible Spectre-v1 for pkt_d
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Cosmic VM with proposed kernel withstand the stress for over 12 hours. ** Tags removed: verification-needed-cosmic ** Tags added: verification-done-cosmic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Cosmic verification in progress. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Bionic VM with proposed kernel withstand the stress for over an hour. ** Tags removed: verification-needed-bionic ** Tags added: verification-done-bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- cosmic' to 'verification-done-cosmic'. If the problem still exists, change the tag 'verification-needed-cosmic' to 'verification-failed- cosmic'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-cosmic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
** Changed in: linux (Ubuntu Cosmic) Status: In Progress => Fix Committed ** Changed in: linux (Ubuntu Bionic) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
** Description changed: - Under memory pressure, my VM locks up. This has been reported upstream - though I don't know how far any solution has progressed. + == Justification == + When using z3fold and zswap on a VM under overcommitted memory stress, + z3fold will complains about an "unknown buddy id 0" and fail to get a + pointer to the mapped allocation in z3fold_map(). + + z3fold: unknown buddy id 0 + WARNING: CPU: 2 PID: 1584 at mm/z3fold.c:971 z3fold_zpool_map+0xce/0x100 [z3fold] + + And it will leads to a null pointer dereference in zswap + + BUG: unable to handle kernel NULL pointer dereference at + PGD 0 P4D 0 + Oops: [#1] SMP PTI + CPU: 2 PID: 1584 Comm: stress Tainted: GW 4.18.0-17-generic #18-Ubuntu + Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014 + RIP: 0010:zswap_writeback_entry+0x4d/0x360 + + == Fix == + ca0246bb (z3fold: fix possible reclaim races) + + This patch has already in Disco, and can be cherry-picked into B/C. + Not needed for Xenial and older kernels as z3fold is not supported. + + == Test == + Test kernels for Bionic / Cosmic could be found here: + http://people.canonical.com/~phlin/kernel/lp-1814874-z3fold-zswap/Bionic/ + http://people.canonical.com/~phlin/kernel/lp-1814874-z3fold-zswap/Cosmic/ + + This issue can be reproduced easily in a KVM with the following setup: + * 8G disk, 4G RAM, 4 CPUs + * 1G swap + * "zswap.enabled=1 zswap.zpool=z3fold zswap.max_pool_percent=7" added to grub + * "z3fold" module added into /etc/initramfs-tools/modules + + Stress it with two childs running: + * stress --vm-bytes 512M --vm 4 --vm-hang 3 + * stress --vm-bytes 512M --vm 4 --vm-hang 7 + + The VM is expected to crash within 5 minutes. + + With the patched kernel, the VM can withstand this stress for over an + hour with crashing with this issue + + == Regression potential == + Small. + + Fix limited to z3fold. User needs to enable it explicitly for this + feature. + + + == Original Bug Report == + Under memory pressure, my VM locks up. This has been reported upstream though I don't know how far any solution has progressed. https://bugzilla.kernel.org/show_bug.cgi?id=201603 Feb 6 07:15:42 vps632258 kernel: [151336.450064] z3fold: unknown buddy id 0 Feb 6 07:15:42 vps632258 kernel: [151336.454450] BUG: unable to handle kernel NULL pointer dereference at 0008 The little bit of log I managed to salvage is attached. This has happened to two identical VMs. Unusually it has not occurred on a third VM which is configured the same but has less RAM (fingers crossed it won't). Irrelevant information: I thought the lock-ups were due to me using a BTRFS filesystem, however I swapped over to NILFS2 and this still occurs. The only difference seems to be that I am now able to grab some of the kernel output. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.18.0-14-generic 4.18.0-14.15~18.04.1 ProcVersionSignature: Ubuntu 4.18.0-14.15~18.04.1-generic 4.18.20 Uname: Linux 4.18.0-14-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.5 Architecture: amd64 Date: Wed Feb 6 10:55:05 2019 ProcEnviron: - TERM=xterm - PATH=(custom, no user) - XDG_RUNTIME_DIR= - LANG=en_GB.UTF-8 - SHELL=/bin/bash + TERM=xterm + PATH=(custom, no user) + XDG_RUNTIME_DIR= + LANG=en_GB.UTF-8 + SHELL=/bin/bash SourcePackage: linux-signed-hwe UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
** Also affects: linux (Ubuntu Bionic) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Bionic) Status: New => In Progress ** Changed in: linux (Ubuntu Cosmic) Status: New => In Progress ** Changed in: linux (Ubuntu) Status: In Progress => Fix Released ** Tags added: cosmic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Can be reproduced easily with Cosmic kernel, patch works as expected. A test kernel could be found here: http://people.canonical.com/~phlin/kernel/lp-1814874-z3fold- zswap/Cosmic/ Will try this on Bionic next. ** Also affects: linux (Ubuntu Cosmic) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Thanks for the feedback, I will see if I can reproduce this and SRU this patch. ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Po-Hsu Lin (cypressyew) ** Changed in: linux (Ubuntu) Status: New => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
I don't recall seeing a soft lockup at all, not a related one anyway. Sadly I don't have a specific command but I did find it triggered when: 1. Memory is overcommited. It doesn't have to be heavily overcommitted. 2. I/O is very high. 3. I “leave“ an SSH session, releasing a small amount of memory. The patch seems to suggest that it is this release that causes the problem. My guess would be that part of the session is already in the compressed cache, and it is released while another process attempts to enter the compressed cache. I don't even know if that makes sense. To add to the confusion: it crashes fairly consistently across VMs and bare metal, but occasionally a server under the same sort of stress, and otherwise identical setup, can run weeks or months without issue. At this point, though, I know of no specific command to trigger it. If I get time I can have a play around but that may never happen. I usually have zswap.max_pool_percent=50, but everything else can vary and the result is the same. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Hello Ken,
do you have a command to reproduce this? I would like to use it to
verify the fix.
I tired this on a Cosmic KVM allocated with 2G ram, 512MB swap, with:
* "zswap.enabled=1 zswap.zpool=z3fold zswap.max_pool_percent=5
zswap.compressor=lz4" added to the grub
* z3pool, lz4, lz4_compress module added to initramfs
and stress it with the stress command with 115% of available memory.
stress --vm-bytes $(awk '/MemAvailable/{printf "%d\n", $2 * 1.15;}' <
/proc/meminfo)k --vm-keep -m 1
All I got is a soft CPU lockup. Or should I leave it there for a while?
Thanks
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NULL pointer dereference when using z3fold and zswap
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[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Fix available in upstream: https://github.com/torvalds/linux/commit/ca0246bb97c23da9d267c2107c07fb77e38205c9 It can be cherry-picked into B/C It's already landed in Disco as Ken mentioned in #13 ** Package changed: linux-signed-hwe (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
As an aside: I'm seeing much better system response time using zRAM alone than I am using zswap alone, but this may have improved in the newer kernel. In both cases though I am using KSM and THP which clearly improve memory use. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
As above: this should be fixed in Disco, though I have only just switched to the upstream kernel for testing, I suspect that Jagannathan's testing is correct. This is a very serious stability issue in the Ubuntu kernel and really should have had some sort of interaction here by now. It is probably being avoided in the wild by scaling busy systems, but that's not an option for everyone. ** Tags removed: kernel-bug-exists-upstream ** Tags added: kernel-fixed-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
** Changed in: linux Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1814874 Title: NULL pointer dereference when using z3fold and zswap To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1814874/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1814874] Re: NULL pointer dereference when using z3fold and zswap
Launchpad has imported 6 comments from the remote bug at https://bugzilla.kernel.org/show_bug.cgi?id=201603. If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. On 2018-11-02T10:41:46+00:00 jagannathante wrote: Created attachment 279297 dmesg log of crash This happens mostly during memory pressure but I am not sure how to trigger it reliably. I am attaching the full log. This is the kernel commandline >BOOT_IMAGE=../vmlinuz-linux root=UUID=57274b3a-92ab-468e-b03a-06026675c1af rw >rd.luks.name=92b4aeb2-fb97-45c1-8a60-2816efe5d57e=home resume=/dev/mapper/home >resume_offset=42772480 acpi_backlight=video zswap.enabled=1 zswap.zpool=z3fold >zswap.max_pool_percent=5 transparent_hugepage=madvise scsi_mod.use_blk_mq=1 >vga=current initrd=../intel-ucode.img,../initramfs-linux.img I found this bug https://bugzilla.kernel.org/show_bug.cgi?id=198585 to be very similar but the proposed fix has not been merged so I can't be sure if it will fix the issue I am having. Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-signed- hwe/+bug/1814874/comments/0 On 2018-11-06T12:28:15+00:00 enelar wrote: Created attachment 279341 Log before kernel panic and after hard reset Arch+deepin+systemd-swap zswap_enabled=1 zswap_compressor=lzo zswap_max_pool_percent=5 zswap_zpool=z3fold zram_enabled=1 zram_size=$(($RAM_SIZE*1/10)) zram_streams=$NCPU zram_alg=lz4 zram_prio=32767 Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-signed- hwe/+bug/1814874/comments/1 On 2018-11-06T21:48:41+00:00 akpm wrote: (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Fri, 02 Nov 2018 10:41:46 + bugzilla-dae...@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=201603 > > Bug ID: 201603 >Summary: NULL pointer dereference when using z3fold and zswap >Product: Memory Management >Version: 2.5 > Kernel Version: 4.18.16 > Hardware: All > OS: Linux > Tree: Mainline > Status: NEW > Severity: high > Priority: P1 > Component: Page Allocator > Assignee: a...@linux-foundation.org > Reporter: jagannatha...@gmail.com > Regression: No > > Created attachment 279297 > --> https://bugzilla.kernel.org/attachment.cgi?id=279297&action=edit > dmesg log of crash > > This happens mostly during memory pressure but I am not sure how to trigger > it > reliably. I am attaching the full log. > > This is the kernel commandline > > >BOOT_IMAGE=../vmlinuz-linux root=UUID=57274b3a-92ab-468e-b03a-06026675c1af > rw > >rd.luks.name=92b4aeb2-fb97-45c1-8a60-2816efe5d57e=home > resume=/dev/mapper/home > >resume_offset=42772480 acpi_backlight=video zswap.enabled=1 > zswap.zpool=z3fold > >zswap.max_pool_percent=5 transparent_hugepage=madvise scsi_mod.use_blk_mq=1 > >vga=current initrd=../intel-ucode.img,../initramfs-linux.img > > I found this bug https://bugzilla.kernel.org/show_bug.cgi?id=198585 to be > very > similar but the proposed fix has not been merged so I can't be sure if it > will > fix the issue I am having. > > -- > You are receiving this mail because: > You are the assignee for the bug. Reply at: https://bugs.launchpad.net/ubuntu/+source/linux-signed- hwe/+bug/1814874/comments/2 On 2018-11-06T22:10:44+00:00 vitalywool wrote: Created attachment 279353 attachment-22937-0.html Hi, Den tis 6 nov. 2018 kl 22:48 skrev Andrew Morton : > > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). > > On Fri, 02 Nov 2018 10:41:46 + bugzilla-dae...@bugzilla.kernel.org > wrote: > > > https://bugzilla.kernel.org/show_bug.cgi?id=201603 > > > > Bug ID: 201603 > >Summary: NULL pointer dereference when using z3fold and zswap > >Product: Memory Management > >Version: 2.5 > > Kernel Version: 4.18.16 > > Hardware: All > > OS: Linux > > Tree: Mainline > > Status: NEW > > Severity: high > > Priority: P1 > > Component: Page Allocator > > Assignee: a...@linux-foundation.org > > Reporter: jagannatha...@gmail.com > > Regression: No > > > > Created attachment 279297 > > --> https://bugzilla.kernel.org/attachment.cgi?id=279297&action=edit > > dmesg log of crash > > Basing on what I see in dmesg, it is highly likely to get fixed by https://lkml.or
