Kernel 6.8.0-79-generic in this case.. I think rsync may trigger this (probably mass update of atimes on the files?), I had been running an rsync backup on it when I logged in and saw like 600% CPU usage from these workers just churning through CPU time for several minutes. I do have a script that will display Dirty and Writeback from /proc/meminfo and it had like less than 2MB dirty, the "wbs" in this case did not have some huge amount of writebacks going on.
[40673.756842] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 4 times, conside r switching to WQ_UNBOUND [40673.827870] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 8 times, conside r switching to WQ_UNBOUND [40673.881887] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 16 times, consid er switching to WQ_UNBOUND [40674.034833] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 32 times, consid er switching to WQ_UNBOUND [40674.694056] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 64 times, consider switching to WQ_UNBOUND [40678.956775] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 128 times, consider switching to WQ_UNBOUND [40684.067714] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 256 times, consider switching to WQ_UNBOUND [40694.227596] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 512 times, consider switching to WQ_UNBOUND [40763.993648] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 1024 times, consider switching to WQ_UNBOUND [41021.791329] kauditd_printk_skb: 125 callbacks suppressed This does seem intermittent, and this thing's a 6 core/12 thread, so I doubt it's noticeably slowing down the system. But definitely odd. -- 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/2038492 Title: workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 16 times, consider switching to WQ_UNBOUND Status in linux package in Ubuntu: Fix Released Status in linux-oem-6.5 package in Ubuntu: Confirmed Bug description: dmesg has multiple messages: [ 852.580542] evict_inodes inode 00000000be24a21a, i_count = 1, was skipped! [ 852.580543] evict_inodes inode 000000002aea522e, i_count = 1, was skipped! [ 852.580544] evict_inodes inode 0000000048d75a5c, i_count = 1, was skipped! [ 852.580545] evict_inodes inode 00000000d8a9e4c2, i_count = 1, was skipped! [ 852.580546] evict_inodes inode 000000003d2c905c, i_count = 1, was skipped! [ 852.580547] evict_inodes inode 00000000e5b1b232, i_count = 1, was skipped! [ 852.580548] evict_inodes inode 0000000097383a6b, i_count = 1, was skipped! [ 852.580549] evict_inodes inode 00000000ca8e2b44, i_count = 1, was skipped! [ 1751.869281] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND [ 1781.467278] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND [ 1806.065364] workqueue: inode_switch_wbs_work_fn hogged CPU for >10000us 16 times, consider switching to WQ_UNBOUND [ 1901.993975] evict_inodes inode 00000000abaa740e, i_count = 1, was skipped! [ 1901.993981] evict_inodes inode 00000000515b9bf8, i_count = 1, was skipped! [ 1901.993983] evict_inodes inode 000000001a69d536, i_count = 1, was skipped! [ 1901.993984] evict_inodes inode 000000001403f675, i_count = 1, was skipped! [ 1901.993985] evict_inodes inode 00000000757de21a, i_count = 1, was skipped! [ 1901.993986] evict_inodes inode 000000000cee9028, i_count = 1, was skipped! [ 1901.993987] evict_inodes inode 00000000d2827e77, i_count = 1, was skipped! Description: Ubuntu 22.04.3 LTS Release: 22.04 linux-oem-22.04d: Installed: 6.5.0.1004.4 Candidate: 6.5.0.1004.4 Seems related to #2037214 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2038492/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
