(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Mon, 31 May 2021 18:09:38 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=213299 > > Bug ID: 213299 > Summary: kswapd Regression as of 5.13-rc3, eats 100% of CPU for > no reason > Product: Memory Management > Version: 2.5 > Kernel Version: 5.13-rc3, 5.13-rc4 > Hardware: All > OS: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Slab Allocator > Assignee: akpm@xxxxxxxxxxxxxxxxxxxx > Reporter: gardotd426@xxxxxxxxx > Regression: No > > I've seen reports of kswapd0 eating up CPU, but this doesn't fit those > descriptions. > > - The bug is not present on 5.12. > > - It happens immediately on boot, CPU usage goes to 100 on all 24 threads of a > Ryzen 5900X > > - The only solution is to run `sudo pkill -9 kswapd0`. swapoff does nothing, > nor does `echo 1 > /proc/sys/vm/drop_caches`. > > - I have a swap partition and 32GB of RAM. Like I said, this happens on boot, > so nowhere *near* 32GB of RAM is being taken. And no swap is being used. This > is clearly an error in kswapd, it's like it goes completely bonkers. 5.13-rc2 > didn't have it, nor did rc1, and 5.12 doesn't have it either. > > > System Info: > > Arch Linux > Kernel: 5.13-rc3, 5.13-rc4 > Ryzen 9 5900X > 32GB DDR4-3600 > 40GB Swap partition on SSD > > sudo dmesg | grep -i swap only gives these three lines so far (after already > killing the process and about 5 min. after boot): > > [ 0.093277] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user > pointer sanitization > [ 0.334800] zswap: loaded using pool lz4/z3fold > [ 2.941371] Adding 41502716k swap on /dev/sdb3. Priority:-2 extents:1 > across:41502716k SSFS > > -- > You may reply to this email to add a comment. > > You are receiving this mail because: > You are the assignee for the bug.
