Public bug reported: [Impact] During the S3 stress test, the system sometimes hangs when resuming. This is due to the SCSI rescan task being unable to acquire the mutex lock during the resumption from S3. The mutex lock has already been acquired by EH and is waiting for the device to be ready for a rescan. Unfortunately, the mutex lock is never released by either party, leading to a deadlock.
[Fix] Kaiheng submitted a patch to fix this issue which defers the rescan if the disk is still suspended so the resume process of the disk device can proceed. https://patchwork.ozlabs.org/project/linux-ide/patch/20230502150435.423770-2-kai.heng.f...@canonical.com/ Since the patch has not been accepted by the upstream yet, so submit it to the OEM kernel for now. [Test] Verified on the machines by me and ODM. [Where problems could occur] It only defers the rescan task, and should not have any impact to current systems. ** Affects: hwe-next Importance: Undecided Status: New ** Affects: linux (Ubuntu) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Affects: linux-oem-6.1 (Ubuntu) Importance: Undecided Status: Invalid ** Affects: linux (Ubuntu Jammy) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Affects: linux-oem-6.1 (Ubuntu Jammy) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Affects: linux (Ubuntu Lunar) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Affects: linux-oem-6.1 (Ubuntu Lunar) Importance: Undecided Status: Invalid ** Affects: linux (Ubuntu Mantic) Importance: Undecided Assignee: AceLan Kao (acelankao) Status: In Progress ** Affects: linux-oem-6.1 (Ubuntu Mantic) Importance: Undecided Status: Invalid ** Tags: oem-priority originate-from-1999593 somerville ** Also affects: linux-oem-6.1 (Ubuntu) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Mantic) Importance: Undecided Status: New ** Also affects: linux-oem-6.1 (Ubuntu Mantic) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Lunar) Importance: Undecided Status: New ** Also affects: linux-oem-6.1 (Ubuntu Lunar) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Jammy) Importance: Undecided Status: New ** Also affects: linux-oem-6.1 (Ubuntu Jammy) Importance: Undecided Status: New ** Changed in: linux-oem-6.1 (Ubuntu Lunar) Status: New => Invalid ** Changed in: linux-oem-6.1 (Ubuntu Mantic) Status: New => Invalid ** Changed in: linux-oem-6.1 (Ubuntu Jammy) Status: New => In Progress ** Changed in: linux-oem-6.1 (Ubuntu Jammy) Assignee: (unassigned) => AceLan Kao (acelankao) ** Changed in: linux (Ubuntu Mantic) Assignee: (unassigned) => AceLan Kao (acelankao) ** Changed in: linux (Ubuntu Lunar) Assignee: (unassigned) => AceLan Kao (acelankao) ** Changed in: linux (Ubuntu Jammy) Assignee: (unassigned) => AceLan Kao (acelankao) ** Changed in: linux (Ubuntu Mantic) Status: New => In Progress ** Changed in: linux (Ubuntu Lunar) Status: New => In Progress ** Changed in: linux (Ubuntu Jammy) Status: New => In Progress ** Tags added: oem-priority originate-from-1999593 somerville ** Summary changed: - A race condiction issue in scsi rescan task while resuming from S3 + A deadlock issue in scsi rescan task while resuming from S3 -- 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/2018566 Title: A deadlock issue in scsi rescan task while resuming from S3 Status in HWE Next: New Status in linux package in Ubuntu: In Progress Status in linux-oem-6.1 package in Ubuntu: Invalid Status in linux source package in Jammy: In Progress Status in linux-oem-6.1 source package in Jammy: In Progress Status in linux source package in Lunar: In Progress Status in linux-oem-6.1 source package in Lunar: Invalid Status in linux source package in Mantic: In Progress Status in linux-oem-6.1 source package in Mantic: Invalid Bug description: [Impact] During the S3 stress test, the system sometimes hangs when resuming. This is due to the SCSI rescan task being unable to acquire the mutex lock during the resumption from S3. The mutex lock has already been acquired by EH and is waiting for the device to be ready for a rescan. Unfortunately, the mutex lock is never released by either party, leading to a deadlock. [Fix] Kaiheng submitted a patch to fix this issue which defers the rescan if the disk is still suspended so the resume process of the disk device can proceed. https://patchwork.ozlabs.org/project/linux-ide/patch/20230502150435.423770-2-kai.heng.f...@canonical.com/ Since the patch has not been accepted by the upstream yet, so submit it to the OEM kernel for now. [Test] Verified on the machines by me and ODM. [Where problems could occur] It only defers the rescan task, and should not have any impact to current systems. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2018566/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
