[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

This commit was applied in Ubuntu-4.4.0-67.88. Closing this out. ** Changed in: linux (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

This is still not fixed in the latest ubuntu kernel - 4.4.0-38-generic #57-Ubuntu. Considering the low-impact of the fix is this going to go in future 4.4 releases? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

Ping on the issue. I now also managed to trigger it while setting a very simple systemtap probe: probe kernel.function("generic_fillattr") { printf("Uid in inode: %u gid: %u\n", $inode->i_uid->val, $inode->i_gid->val); } Running this resulted in: [854807.910390] invalid opcode:

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

Original report of the exact same issue: https://lkml.org/lkml/2016/5/13/327 -- 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/1605843 Title: Kernel crashes from time to time when using

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

I think the fix for this crash is this upstream commit: 8329e818f14926a6040df86b2668568bde342ebf -- 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/1605843 Title: Kernel crashes from time

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

Is there a way to obtain a vmlinux image for the upstream kernel as built by ubuntu (without having to compile locally) so that I can compare the disassemblies of the ftrace_stub ? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

I tried with the upstream kernel : nborisov@fisk:~$ uname -a Linux fisk 4.7.0-040700-generic #201607241632 SMP Sun Jul 24 20:34:30 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux In the meantime I managed to find a sequence which can trigger this 100% of the time on the ubuntu kernel. The following

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem? Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.7

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

So here is a disassembly of the ftrace functions: 0x8183026b :mov$0x0,%rcx 0x81830272 : callq 0x81156d80 0x81830277 : mov0x40(%rsp),%r9 0x8183027c :mov0x48(%rsp),%r8

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

** Attachment added: "version.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705812/+files/version.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu.

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

** Attachment added: "uname-a.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705813/+files/uname-a.log ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Kernel Packages,

[Kernel-packages] [Bug 1605843] Re: Kernel crashes from time to time when using ftrace

Dmesg as seen from the crash dump image. ** Attachment added: "dmesg.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1605843/+attachment/4705811/+files/dmesg.log -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in