In Xenial source code, the warning was triggered here in ioat_dca_init()
of drivers/dma/ioat/dca.c:
if (dca3_tag_map_invalid(ioatdca->tag_map)) {
WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
"%s %s: APICID_TAG_MAP set incorrectly by BIOS,
disabling DCA\n",
dev_driver_string(&pdev->dev),
dev_name(&pdev->dev));
free_dca_provider(dca);
return NULL;
}
This is the WARNING in log_check, I think it generates the tainted flag
as well.
The code was later replaced by:
https://github.com/torvalds/linux/commit/036e9ef8becde736e693be4f4bef56d5b56fc298
#diff-a6ce63e9c9f1a0aac9223c055a717e8fd34d3a4793a3166e4a9bb3b6d1c54c9f
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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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/1912316
Title:
log_check / kernel_tainted test from ubuntu_boot failed on Intel Cloud
node grumman
Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
New
Status in linux source package in Xenial:
New
Bug description:
Issue found on node grumman, this is not a regression.
The kernel_tainted check reports a non-zero flag 2048, this means
"workaround for bug in platform firmware applied"
log_check reports WARNINGs found in the dmesg:
10. 01/06 09:46:51 INFO |ubuntu_boo:0030| kernel: [ 7.852005] WARNING: CPU:
0 PID: 179 at /build/linux-0dlxvs/linux-4.4.0/drivers/dma/ioat/dca.c:342
ioat_dca_init+0x17c/0x1a0 [ioatdma]()
11. 01/06 09:46:51 INFO |ubuntu_boo:0030| kernel: [ 5.387292] WARNING: CPU:
0 PID: 181 at /build/linux-7Nk88i/linux-4.4.0/drivers/dma/ioat/dca.c:342
ioat_dca_init+0x17c/0x1a0 [ioatdma]()
12. 01/06 09:46:51 INFO |ubuntu_boo:0030| kernel: [ 6.039705] WARNING: CPU:
0 PID: 4 at /build/linux-7Nk88i/linux-4.4.0/drivers/dma/ioat/dca.c:342
ioat_dca_init+0x17c/0x1a0 [ioatdma]()
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