On Fri, Jun 23, 2023 at 07:58:51AM +0700, Bagas Sanjaya wrote: > Hi, > > I notice a regression report on Bugzilla [1]. Quoting from it: > > > kernel process "kworker/events_power_efficient" uses a lot of cpu power (100% on ESXI 6.7, ~30% on ESXI 7.0U3 or later) after upgrading from 5.17.3 to 5.19.17 or later. > > > > dmesg log: > > [ 2430.973102] </TASK> > > [ 2430.973131] Sending NMI from CPU 1 to CPUs 0: > > [ 2430.973241] NMI backtrace for cpu 0 > > [ 2430.973247] CPU: 0 PID: 22 Comm: kworker/0:1 Not tainted 6.3.3 #1 > > [ 2430.973254] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 > > [ 2430.973258] Workqueue: events_power_efficient htable_gc [xt_hashlimit] > > [ 2430.973275] RIP: 0010:preempt_count_sub+0x2e/0xa0 > > [ 2430.973289] Code: 36 01 85 c9 75 1b 65 8b 15 a7 da f8 5e 89 d1 81 e1 ff ff ff 7f 39 f9 7c 16 81 ff fe 00 00 00 76 3b f7 df 65 01 3d 8a da f8 5e <c3> cc cc cc cc e8 98 aa 25 00 85 c0 74 f2 8b 15 da 71 ed 00 85 d2 > > [ 2430.973294] RSP: 0018:ffffb15ec00dbe58 EFLAGS: 00000297 > > [ 2430.973299] RAX: 0000000000000000 RBX: ffffb15ec12ad000 RCX: 0000000000000001 > > [ 2430.973302] RDX: 0000000080000001 RSI: ffffffffa1c3313b RDI: 00000000ffffffff > > [ 2430.973306] RBP: dead000000000122 R08: 0000000000000010 R09: 0000746e65696369 > > [ 2430.973309] R10: 8080808080808080 R11: 0000000000000018 R12: 0000000000000000 > > [ 2430.973312] R13: 0000000000001e2b R14: ffffb15ec12ad048 R15: ffff91c279c26a05 > > [ 2430.973316] FS: 0000000000000000(0000) GS:ffff91c279c00000(0000) knlGS:0000000000000000 > > [ 2430.973320] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > [ 2430.973324] CR2: 000055fc138890e0 CR3: 000000010810e002 CR4: 00000000001706f0 > > [ 2430.973374] Call Trace: > > [ 2430.973388] <TASK> > > [ 2430.973390] __local_bh_enable_ip+0x32/0x70 > > [ 2430.973413] htable_selective_cleanup+0x95/0xc0 [xt_hashlimit] > > [ 2430.973428] htable_gc+0xf/0x30 [xt_hashlimit] > > [ 2430.973440] process_one_work+0x1d4/0x360 > > [ 2430.973459] ? process_one_work+0x360/0x360 > > [ 2430.973467] worker_thread+0x25/0x3b0 > > [ 2430.973476] ? process_one_work+0x360/0x360 > > [ 2430.973483] kthread+0xe1/0x110 > > [ 2430.973499] ? kthread_complete_and_exit+0x20/0x20 > > [ 2430.973507] ret_from_fork+0x1f/0x30 > > [ 2430.973526] </TASK> > > See Bugzilla for the full thread and perf output. > > Anyway, I'm tracking it in regzbot so that it doesn't fall through > cracks unnoticed: > > #regzbot introduced: v5.17.3..v5.19.17 https://bugzilla.kernel.org/show_bug.cgi?id=217586 > #regzbot title: kworker/events_power_efficient utilizes full CPU power after kernel upgrade > The reporter had found the culprit (see Bugzilla for more information), thus telling regzbot: #regzbot introduced: 6ad0ad2bf8a67e #regzbot title: retbleed reporting causes high cpu utilization due to kworker/events_power_efficient #regzbot link: https://lore.kernel.org/all/PH0PR05MB8448A203A909959FAC754B7AAF439@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ #regzbot link: 6ad0ad2bf8a67e Thanks. -- An old man doll... just what I always wanted! - Clara
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