Arch Linux

Please read this before reporting a bug:

Do NOT report bugs when a package is just outdated, or it is in the AUR. Use the 'flag out of date' link on the package page, or the Mailing List.

REPEAT: Do NOT report bugs for outdated packages!

FS#60896 - [linux] System hangs randomly in kswapd0 on kernel versions 4.18 and 4.19

Attached to Project: Arch Linux
Opened by Vadim (VadimD) - Friday, 23 November 2018, 17:05 GMT
Last edited by Doug Newgard (Scimmia) - Sunday, 09 December 2018, 19:00 GMT
Task Type Bug Report
Category Kernel
Status Assigned
Assigned To Tobias Powalowski (tpowa)
Jan Alexander Steffens (heftig)
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 0%
Votes 0
Private No



Sometimes (3 out of 10 times) when I build AOSP image inside a docker container my pc hangs
the mouse is not moving, music stops, and keyboard not responding (numlock doesn't work).

Only happens on kernel versions 4.18 and 4.19. LTS 4.14 works fine, and i don't remember having this issue on 3.17 and earlier.

When I saw "kswapd" in the log, I thought maybe my SSD goes bad, so I moved the swap partition from SSD to the regular hard drive,
but this didn't help, in fact the hangs started happening more frequently.

kernel: INFO: task kswapd0:58 blocked for more than 120 seconds.
kernel: Not tainted 4.19.2-arch1-1-ARCH #1
kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kernel: kswapd0 D 0 58 2 0x80000000
kernel: Call Trace:
kernel: ? __schedule+0x29b/0x8b0
kernel: ? xfs_reclaim_inode+0xc5/0x330 [xfs]
kernel: schedule+0x32/0x90
kernel: io_schedule+0x12/0x40
kernel: __xfs_iunpin_wait+0xd6/0x170 [xfs]
kernel: ? init_wait_var_entry+0x40/0x40
kernel: xfs_reclaim_inode+0xc5/0x330 [xfs]
kernel: xfs_reclaim_inodes_ag+0x1b9/0x320 [xfs]
kernel: ? percpu_counter_add_batch+0x84/0xb0
kernel: ? radix_tree_gang_lookup_tag+0xd3/0x160
kernel: ? iput+0x210/0x210
kernel: ? _raw_spin_unlock+0x16/0x30
kernel: ? preempt_count_add+0x79/0xb0
kernel: xfs_reclaim_inodes_nr+0x31/0x40 [xfs]
kernel: super_cache_scan+0x155/0x1a0
kernel: do_shrink_slab+0x12f/0x2b0
kernel: shrink_slab+0x228/0x290
kernel: shrink_node+0xe6/0x4a0
kernel: kswapd+0x3e2/0x720
kernel: ? mem_cgroup_shrink_node+0x1a0/0x1a0
kernel: kthread+0x112/0x130
kernel: ? kthread_park+0x80/0x80
kernel: ret_from_fork+0x35/0x40
This task depends upon

Comment by Vadim (VadimD) - Monday, 04 February 2019, 12:44 GMT
Happened again today on 4.20.3 kernel. Versions "4.19.4" and "4.20.1" were quiet, I didn't see any hangs while using them, and I almost thought the issue was resolved.
   4_20_3.log (316.8 KiB)