** Summary changed:
- kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s!
+ Soft lockup due to interrupt storm from smbus
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https://bugs.launchpad.net/bugs/1931
Believed to be fixed in the kernel by two commits.
See: https://bugzilla.kernel.org/show_bug.cgi?id=177311#c65
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https://bugs.launchpad.net/bugs/1931001
Title:
kern
New best workaround, instead of blacklisting i2c-i801 keep it but
disable interrupts and use polling instead.
Step 1 Temporary and to be able to boot for step 2).
a. To able to boot enter the grub menu (press ESC once during boot)
b. select the (Ubuntu)Linux entry you want to boot and press "e" to
I started kernel bisecting in an attempt to find the commit that causes this
issue.
Painfull process.
I found another workaround (not a solution) on stackoverflow (which has
been deleted from stackoverflow by now). The workaround was to disable
virtualization in the BIOS: Intel VTX -> disabled ,
I also tied blacklisting only "i801_smbus" but that gave the same issue.
Only blacklisting "i2c_i801" is currently the best workaround.
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** Bug watch added: Red Hat Bugzilla #2009977
https://bugzilla.redhat.com/show_bug.cgi?id=2009977
** Also affects: fedora via
https://bugzilla.redhat.com/show_bug.cgi?id=2009977
Importance: Unknown
Status: Unknown
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Possible work around (not a fix), blacklist module i2c_i801. It works
for me ...
Since I noticed a high amount of CPU time spent in interrupt handling I looked
at /proc/interrupts (right after the slow boot and slow login):
$ cat /proc/interrupts
CPU0 CPU1
0:
Also tried kernel parameter watchdog_thresh=20, same problem
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https://bugs.launchpad.net/bugs/1931001
Title:
kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 2
Since I was not to use "Also affects distribution/package" functionality, I add
the following links of very simular bugreports in distro's other than Ubuntu:
* https://bugs.archlinux.org/task/71575
* https://bugs.archlinux.org/task/70236
* https://bbs.archlinux.org/viewtopic.php?id=264127
* https:
Same same, after upgrade from 5.8 to 5.11.
Soft lockups during boot, long boot time, and after that a very slow machine.
My machine is also Intel Celeron based, like the previous reports.
After login into the desktop environment, the "atop" program shows that almost
all cpu time is spent in irq,
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