[Arista][T2] Kernel panic seen on supervisor during reboot tests #20901
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@saiarcot895, can you please help with this issue |
@saiarcot895 ping again, thanks |
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Will look at this next week |
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For certain pci tree structures involving pci devices with sibling functions we can get a nullptr dereference when the link state goes down due to this change. Fixing: sonic-net/sonic-buildimage#20901 Reverting: torvalds/linux@456d8aa Upstream Discussion: https://lore.kernel.org/linux-pci/20240801171103.GA107989@bhelgaas/T/#t
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…#448) * Reverting 456d8aa to avoid kernel panics in 6.1.94 For certain pci tree structures involving pci devices with sibling functions we can get a nullptr dereference when the link state goes down due to this change. Fixing: sonic-net/sonic-buildimage#20901 Reverting: torvalds/linux@456d8aa Upstream Discussion: https://lore.kernel.org/linux-pci/20240801171103.GA107989@bhelgaas/T/#t * Adding upstream discussion link and summary in patch
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…sonic-net#448) * Reverting 456d8aa to avoid kernel panics in 6.1.94 For certain pci tree structures involving pci devices with sibling functions we can get a nullptr dereference when the link state goes down due to this change. Fixing: sonic-net/sonic-buildimage#20901 Reverting: torvalds/linux@456d8aa Upstream Discussion: https://lore.kernel.org/linux-pci/20240801171103.GA107989@bhelgaas/T/#t * Adding upstream discussion link and summary in patch
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…#448) (#453) * Reverting 456d8aa to avoid kernel panics in 6.1.94 For certain pci tree structures involving pci devices with sibling functions we can get a nullptr dereference when the link state goes down due to this change. Fixing: sonic-net/sonic-buildimage#20901 Reverting: torvalds/linux@456d8aa Upstream Discussion: https://lore.kernel.org/linux-pci/20240801171103.GA107989@bhelgaas/T/#t * Adding upstream discussion link and summary in patch Co-authored-by: arista-nwolfe <[email protected]>
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Both the revert and fix should avoid kernel panics described in sonic-net/sonic-buildimage#20901 but by patching the fix earlier hopefully it makes adopting this change easier in the kernel bump ups to come.
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Both the revert and fix should avoid kernel panics described in sonic-net/sonic-buildimage#20901 but by patching the fix earlier hopefully it makes adopting this change easier in the kernel bump ups to come.
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* [PCI/ASPM] Replaced revert with patch of proper upstream fix Both the revert and fix should avoid kernel panics described in sonic-net/sonic-buildimage#20901 but by patching the fix earlier hopefully it makes adopting this change easier in the kernel bump ups to come. * Added upstream commit hash to patch
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As indicated in aristanetworks/sonic#109 during reboot tests (module api platform tests) a kernel panic can occur on the supervisor, this was introduced in the kernel upgrade to 6.1.94 (6.1.0-22-2)
#19885
Upon further investigation it was this specific change that seems to have caused this kernel panic:
torvalds/linux@456d8aa
We can see this commit is present when comparing the previous version (6.1.38)
https://elixir.free-electrons.com/linux/v6.1.38/source/drivers/pci/pcie/aspm.c#L1003
And the newer version (6.1.94)
https://elixir.free-electrons.com/linux/v6.1.94/source/drivers/pci/pcie/aspm.c#L1018
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