[Kernel-packages] [Bug 1776005] Re: kernel instability with BTRFS filesystem as rootfs
** Tags added: cscc -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: Incomplete Status in linux source package in Xenial: Incomplete Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
** Changed in: linux (Ubuntu Xenial) Status: In Progress => Incomplete ** Changed in: linux (Ubuntu) Status: In Progress => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: Incomplete Status in linux source package in Xenial: Incomplete Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
Hello Joseph, I have tested the kernel you kindly provide in #5 but this not resolves the issue on all laptop which have trouble. What I said in #4 is partial and not resolves the issue on all test cases. Sorry for this wrong interpretation, but the cases are quite complicated. I have hidden some useless comments of my own that can disrupt the reading of this bug report. Thanks for your time, Sylvain -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
Hello, After many contradictory tests, because not reproducible, the only solution that works on all the laptop where appeared the problem, is to install the latest kernel 4.4.0.130.136 (proposed) and to uninstall the package "intel-microcode" and replace it with a dummy package to prevent the installation of intel microcode, which seems not functional in some cases. This workaround is far from optimal in terms of updates, but seems to solve these wired errors. Best regards, Sylvain -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
Maybe what I say is not clear to everyone, in other words the kernel that you propose seems to correct the problem. Thanks. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
Hello Joseph, I tested the kernel you provide with the commit 2f500a9d7ff6 reverted and after many reboot to test stability I have not been able to reproduce the kernel "panic" with the traceback above (see #1). I have take care that the "noapic" option wasn't pass to grub (like in #4) and that I boot the provided test kernel (#155~lp1776005). See below a "paste" to ensure that I'm doing the right test. http://paste.ubuntu.com/p/52RfcTG9NG/ I will receive soon other laptops which seems to have a similar symptom but not exactly the same. Hoping it's a problem related to this commit too In all case, thanks for your time on this issue. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
I built a test kernel with a revert of commit 2f500a9d7ff6. The test kernel can be downloaded from: http://kernel.ubuntu.com/~jsalisbury/lp1776005 Can you test this kernel and see if it resolves this bug? Note about installing test kernels: • If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages. • If the test kernel is 4.15(Bionic) or newer, you need to install the linux-modules, linux-modules-extra and linux-image-unsigned .deb packages. Thanks in advance! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
** Changed in: linux (Ubuntu) Importance: Undecided => High ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Xenial) Status: New => In Progress ** Changed in: linux (Ubuntu) Status: Incomplete => In Progress ** Changed in: linux (Ubuntu Xenial) Importance: Undecided => High ** Changed in: linux (Ubuntu Xenial) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
Hello, It seems that the IO-APIC [1] is the main origin of this instability. So booting the kernel with the option "noapic" seems to be a good workaround for this issue, even if it's difficult to me to spot the commit which is the origin of this problem in reasonable time. Best regards, [1]: https://fr.wikipedia.org/wiki/IO-APIC Sylvain -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: Incomplete Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
** Description changed: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with - previous kernels (like 4.4.0-127-generic). + previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: New Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-124-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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 1776005] Re: kernel instability with BTRFS filesystem as rootfs
The apport log, after a successful boot on the 4.4.0-127-generic ** Attachment added: "apport.linux-image-4.4.0-127-generic.3q2f5jgx.apport" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+attachment/5150600/+files/apport.linux-image-4.4.0-127-generic.3q2f5jgx.apport -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1776005 Title: kernel instability with BTRFS filesystem as rootfs Status in linux package in Ubuntu: New Bug description: Hello, As explained yesterday on #ubuntu-kernel, several laptop won't boot (kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS I have made many tests to verify that the bootloader (GRUB) is correctly configured (I have also reinstall it, but same result). I have also verified the BTRFS system is clean and not corrupted (with a livecd). The behavior is unpredictable, because often the kernel fall in "panic" during boot, but not all the time, if i do several consecutive reboot to test stability of the boot "process". I have no search behavior with previous kernels (like 4.4.0-127-generic). I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that something I changed on last kernel: - on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a long time) - something related with the last mitigation about the recent security processor breach But my skills stop here, and I'm not able to find the origin of this behavior despite my efforts. I can continue my investigation if I have some additional pointers. Thanks for your time, Sylvain To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776005/+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
