Public bug reported:
---Problem Description---
Request to backport cxlflash EEH patch to Xenial SRU
---System Hang---
When a cxlflash adapter goes into EEH recovery and multiple processes
(each having established its own context) are active, the EEH recovery
can hang if the processes attempt to recover in parallel.
After debugging the problem, patch has been upstreamed for this issue and the
system has been rebooted with the fix for the problem
---Steps to Reproduce---
Injecting EEH when multiple processes are active can trigger the issue
Stack trace output:
Call Trace:
__switch_to+0x2f0/0x410
__schedule+0x300/0x980
schedule+0x48/0xc0
rwsem_down_write_failed+0x294/0x410
down_write+0x88/0xb0
cxlflash_pci_error_detected+0x100/0x1c0 [cxlflash]
cxl_vphb_error_detected+0x88/0x110 [cxl]
cxl_pci_error_detected+0xb0/0x1d0 [cxl]
eeh_report_error+0xbc/0x130
eeh_pe_dev_traverse+0x94/0x160
eeh_handle_normal_event+0x17c/0x450
eeh_handle_event+0x184/0x370
eeh_event_handler+0x1c8/0x1d0
kthread+0x110/0x130
ret_from_kernel_thread+0x5c/0xa4
INFO: task blockio:33215 blocked for more than 120 seconds.
The upstream patch we need backported to Xenial SRU stream is
635f6b0893cff193a1774881ebb1e4a4b9a7fead
cxlflash: Fix to resolve dead-lock during EEH recovery
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-141713 severity-medium
targetmilestone-inin16041
** Tags added: architecture-ppc64le bugnameltc-141713 severity-medium
targetmilestone-inin16041
** Changed in: ubuntu
Assignee: (unassigned) => Taco Screen team (taco-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1584935
Title:
Backport cxlflash patch related to EEH recovery into Xenial SRU stream
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