Nasty Lockup Issue Still Being Investigated for Linux 3.18

Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by bjourne on Sunday November 30, 2014 @12:25PM (#8677346)

Hey, I've had that bug! The whole computer freezes for up to a minute and then you get a dmesg stack trace:

    Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu 3
    CPU: 3 PID: 17176 Comm: trinity-c95 Not tainted 3.17.0+ #87
    0000000000000000 00000000f3a61725 ffff880244606bf0 ffffffff9583e9fa
    ffffffff95c67918 ffff880244606c78 ffffffff9583bcc0 0000000000000010
    ffff880244606c88 ffff880244606c20 00000000f3a61725 0000000000000000
    Call Trace:
    <NMI> [<ffffffff9583e9fa>] dump_stack+0x4e/0x7a
    ...

It was easily reproducible by running two or more cores at 100% for a few minutes. I wanted to be a good citizen and report it, but I wasn't able to figure out where or how you're supposed to report kernel bugs. If it's the same bug as the Phoronix article mentions, then it's not a regression because I've had the problem in 3.13 too.

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by panzi on Sunday November 30, 2014 @12:54PM (#8677446)

Have you tried https://bugzilla.kernel.org/?

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by azernik on Sunday November 30, 2014 @02:18PM (#8677744)

Also, any distribution worth its salt will accept bugs for any package it ships and (especially for something as important as the kernel) report the bugs upstream. This may be a slow process, but it does mean that bugs introduced by distributor patches are more likely to be caught.

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by bjourne on Sunday November 30, 2014 @02:42PM (#8677812)

Afaict, that site only wants bugs for the mainline kernel not for kernels modded by Ubuntu.

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by cpach on Sunday November 30, 2014 @02:59PM (#8677864)

https://wiki.ubuntu.com/Kernel/Bugs

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by davidgerard on Monday December 01, 2014 @07:15AM (#8680566)

There is a PPA for Linus's kernel, it's great for this stuff - makes upstreamable bug reports really easy. (Also for discovering "hey, my proprietary wifi now has a free driver!")

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by cbsmith on Sunday November 30, 2014 @03:11PM (#8677906)

If you had it with 3.13 too, it might not be the same bug. It could well be a bug in a driver.

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by pwr22 on Sunday November 30, 2014 @12:36PM (#8677385)

I have an Xubuntu box with older hardware (running a pentium D something or other) which frequently experiences something similar. I have no idea if it is the same issue as either of these and always chalked it up to faulty hardware

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by jrockway on Monday December 01, 2014 @12:37AM (#8679685)

Hey, at least the watchdog worked.

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Re:Nasty Lockup Issue Still Being Investigated for Linux 3.18 by digi_owl on Sunday November 30, 2014 @01:55PM (#8677651)

Just spitballing here, but it sounds like it could be a issue with the scheduler.

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