Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out"

From	Friedemann Stoyan <fstoyan@swapon.de>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out"
Date	2026-05-04 06:20 +0200
Message-ID	<MQSWK-2ryU-3@gated-at.bofh.it> (permalink)
References	<MPNw5-1GuL-1@gated-at.bofh.it> <MPP4R-1HoN-1@gated-at.bofh.it> <MPNw5-1GuL-1@gated-at.bofh.it> <MPP4R-1HoN-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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On  1.05.26 07:51, Salvatore Bonaccorso wrote:
 
Hello Salvatore,

> I'm sorry to hear about this regression caused with the lastest urgent
> security update for the kernel. Would you be able to bisect the
> changes between 6.12.74 and 6.12.85 to identify which commit triggers
> this specifically?

Bisecting returns this commit:

$ git bisect bad
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[715c263119fd1b918a9fcbd8a36ea5b604a46324] iommu/amd: move wait_on_sem() out of spinlock


$ git bisect log
git bisect start
# status: waiting for both good and bad commits
# good: [444b39ef6108313e8452010b22aaba588e8fb92b] Linux 6.12.74
git bisect good 444b39ef6108313e8452010b22aaba588e8fb92b
# status: waiting for bad commit, 1 good commit known
# bad: [18cd79ce247a35c2938698145d1834a09b5f7777] Linux 6.12.85
git bisect bad 18cd79ce247a35c2938698145d1834a09b5f7777
# bad: [aa9ebc084505fb26dd90f4d7a249045aad152043] unshare: fix unshare_fs() handling
git bisect bad aa9ebc084505fb26dd90f4d7a249045aad152043
# bad: [26c82ec5add2139e9c043d505bb413d8925426ca] wifi: rtw89: wow: add reason codes for disassociation in WoWLAN mode
git bisect bad 26c82ec5add2139e9c043d505bb413d8925426ca
# good: [0c74a63b797ca495e8d48645103bc2b1eb634adf] clk: qcom: gcc-x1e80100: Update the SDCC RCGs to use shared_floor_ops
git bisect good 0c74a63b797ca495e8d48645103bc2b1eb634adf
# good: [5f15fa06dccb6034777aaefd8ccfb2993fb9d9bf] libperf: Don't remove -g when EXTRA_CFLAGS are used
git bisect good 5f15fa06dccb6034777aaefd8ccfb2993fb9d9bf
# good: [1ba3a56f4854fab439e5bfe694062f9024a324ea] media: chips-media: wave5: Process ready frames when CMD_STOP sent to Encoder
git bisect good 1ba3a56f4854fab439e5bfe694062f9024a324ea
# good: [0fa0a82274c8471f9168b4ac338580981da86078] HID: multitouch: add eGalaxTouch EXC3188 support
git bisect good 0fa0a82274c8471f9168b4ac338580981da86078
# good: [bfefacf1996f00fd2d60d99a89e5a73ae7cc9037] ASoC: fsl: imx-rpmsg: use snd_soc_find_dai_with_mutex() in probe
git bisect good bfefacf1996f00fd2d60d99a89e5a73ae7cc9037
# good: [46216a48cd89d5b38fa3c1872ab10a07c369a350] wifi: rtw89: ser: enable error IMR after recovering from L1
git bisect good 46216a48cd89d5b38fa3c1872ab10a07c369a350
# good: [65bc40fea4fd6f5f07db550f4fdf4dee7f42116f] iommu/arm-smmu-v3: Improve CMDQ lock fairness and efficiency
git bisect good 65bc40fea4fd6f5f07db550f4fdf4dee7f42116f
# good: [b82073564373e68c6ae3a96039fae14cd002a496] wifi: libertas: fix WARNING in usb_tx_block
git bisect good b82073564373e68c6ae3a96039fae14cd002a496
# bad: [faac634c2795cb4e2170e329680e7a6f766110ff] wifi: rtw89: mac: correct page number for CSI response
git bisect bad faac634c2795cb4e2170e329680e7a6f766110ff


I'm not sure if that's relevant: It is an older AMD Zen2 CPU:

smpboot: CPU0: AMD Ryzen 5 PRO 4650G with Radeon Graphics (family: 0x17, model: 0x60, stepping: 0x1)

It doesn't matter whether iommu.strict is on or off.

Regards
Friedemann

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Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" "F. Stoyan" <fstoyan+reportbug@swapon.de> - 2026-05-01 06:20 +0200
  Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-01 08:00 +0200
    Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Friedemann Stoyan <fstoyan@swapon.de> - 2026-05-04 06:20 +0200
      Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-04 08:20 +0200
        Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Friedemann Stoyan <fstoyan@swapon.de> - 2026-05-05 04:40 +0200
          Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-05 21:50 +0200
  Processed: Re: Bug#1135313: Logspam: "AMD-Vi: Completion-Wait  loop timed out" "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-01 08:00 +0200
  Processed: Re: Bug#1135313: Logspam: "AMD-Vi: Completion-Wait  loop timed out" "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-04 08:20 +0200
  Bug#1135313: Logspam: "AMD-Vi: Completion-Wait loop timed out" Salvatore Bonaccorso <carnil@debian.org> - 2026-05-04 08:20 +0200
  Bug#1135313: Please backport 9e249c484128 ("iommu/amd: serialize sequence allocation under concurrent TLB invalidations") to 6.12.y Sasha Levin <sashal@kernel.org> - 2026-05-09 14:50 +0200

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