On 05.08.20 15:30, John Paul Adrian Glaubitz wrote:
Hello! On 8/5/20 2:51 PM, John Paul Adrian Glaubitz wrote:So latest 4.14.x kernels should work w/o the patch on a rx2800 i2 with Itanium 9300 (Tukwila) series processors - if they are compiled with gcc 10.I'm currently running a 4.14.192 kernel with the ptrace patch. While it doesn't crash, I'm seeing a kworker thread with rather high load. Do you observe that as well?I have tried 4.19.137 now with the same configuration and Sergey's ptrace patch and sure enough it crashes when loading the first modules.
I think this is due to:
```
rx2800-i2 /usr/src/linux-on-ramdisk # git bisect good
543cea9accd9804307541cb93d3ed7ec94b07237 is the first bad commit
commit 543cea9accd9804307541cb93d3ed7ec94b07237
Author: Christoph Hellwig <hch@lst.de>
Date: Sun Dec 24 15:10:07 2017 +0100
ia64: use generic swiotlb_ops
These are identical to the ia64 ops, and would also support CMA
if enabled on ia64.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Christian König <christian.koenig@amd.com>
:040000 040000 5fe9ea16dd24746410a88e8e57d5722eabf99650
3cdc996c27f5b5f1cb626dcfe246146e09cb804c M arch
```
The bisecting happened between 4.15.18 ([1]) - which still ran on my
rx2800 i2 - and 4.16-rc1 ([2]) - which crashes it during OS bootup.
[1]:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.15.18&id=a8ec862fda39d9adb88469eb8b9125daccc1c8335
[2]:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.16-rc1&id=7928b2cbe55b2a410a0f5c1f154610059c57b1b2
Maybe you try to apply Chrisoph Hellwig's patch from [3] (whole thread
on [4])? If it works then, it could to be related.
[3]: https://marc.info/?l=linux-ia64&m=156145878523498&w=2
[4]: https://marc.info/?l=linux-ia64&m=156144480821712&w=2
Cheers,
Frank