** Tags added: cscc
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Title:
ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX ARM64
Status in linux package in
This bug was erroneously marked for verification in bionic; verification
is not required and verification-needed-bionic is being removed.
** Tags added: verification-done-bionic
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** Tags removed: verification-needed-bionic
** Tags added: kernel-fixup-verification-needed-bionic
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Title:
ubuntu_zram_smoke test
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
This bug was fixed in the package linux - 4.13.0-39.44
---
linux (4.13.0-39.44) artful; urgency=medium
* linux: 4.13.0-39.44 -proposed tracker (LP: #1761456)
* intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
image-4.13.0-37-generic) (LP: #1759920) //
-- before proposed --
Ubuntu 17.10 (GNU/Linux 4.13.0-38-generic aarch64)
ubuntu@anuchin:~$ sudo bash
root@anuchin:~# modprobe zram
root@anuchin:~# echo 1 > /sys/block/zram0/reset
root@anuchin:~# echo deflate > /sys/block/zram0/comp_algorithm
root@anuchin:~# echo 128M > /sys/block/zram0/disksize
This bug was fixed in the package linux - 4.15.0-15.16
---
linux (4.15.0-15.16) bionic; urgency=medium
* linux: 4.15.0-15.16 -proposed tracker (LP: #1761177)
* FFe: Enable configuring resume offset via sysfs (LP: #1760106)
- PM / hibernate: Make passing hibernate offsets
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Artful)
Status: In Progress => Fix Committed
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Title:
ubuntu_zram_smoke test will cause soft
** Changed in: linux (Ubuntu Artful)
Status: New => In Progress
** Changed in: linux (Ubuntu Artful)
Assignee: (unassigned) => Paolo Pisati (p-pisati)
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Patches posted:
https://marc.info/?l=linux-kernel=152224242828223=2
https://marc.info/?l=linux-kernel=152224242228218=2
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Title:
Can be reproduced with X-hwe on ThunderX as well.
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Title:
ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX ARM64
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Assignee: Paolo Pisati (p-pisati)
Status: Confirmed
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: Confirmed => Fix Committed
--
** Description changed:
+ == SRU Justification ==
+
+ Enabling virtual mapped kernel stacks breaks the thunderx_zip driver. On
+ compression or decompression the executing CPU hangs in an endless loop.
+ The reason for this is the usage of __pa() by the driver that does not
+ work for an address
** Tags added: patch
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Title:
ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX ARM64
Status in linux package in
This is a regression caused by CONFIG_VMAP_STACK. The driver uses __pa
(phys_to_virt)
on a stack address which does not work with virtual mapped stacks.
To solve this upstream will require a bit more work, I'm attaching a minimal
patch
to work-around by using kmalloc for the problematic
I can reproduce this issue with 4.13.0-37-generic. The debugfs info for the zip
driver shows that 2 requests are pending. Either the requests are not submitted
properly (Decomp Req Submitted=0) or
not completed (DOORBELL regs = 0).
root@crb1s:/sys/kernel/debug/thunderx_zip# cat zip_stats
Ok, i tested it on another board (seuss) with 4.14.27, 4.15.10 and
4.16-rc4:
4.14.0: affected
4.14.27: affected
4.15.10: affected
4.16-rc: doesn't boot at all, so i can't tell
so we can rule out the bad hardware variable, and we can say for sure
that is not related to kpti at all.
Another
Ok, here is what i found so far:
the problem lies in the 'thunderx_zip' driver, that is the driver for
the hw accelerated zip compressor / decompressor ip block - it kicks in
once we select the deflate method for the zram device.
How way to reproduce it:
# modprobe zram
# echo 1 >
Tested with a Moonshot system, this ubuntu_zram_smoke test can pass with
Artful kernel.
So this matches ppisati's finding in comment #5
** Summary changed:
- ubuntu_zram_smoke test will cause soft lockup on Artful ARM64 kernel
+ ubuntu_zram_smoke test will cause soft lockup on Artful ThunderX
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