On Mon, Jan 16, 2023 at 03:23:46PM +0100, Paul Menzel wrote:
Dear Linux folks,
Could you please apply commit 0c25422d34b4 (scsi: mpt3sas: Remove scsi_dma_map() error messages) to the 5.15.y series?
commit 0c25422d34b4726b2707d5f38560943155a91b80 Author: Sreekanth Reddy sreekanth.reddy@broadcom.com Date: Thu Mar 3 19:32:03 2022 +0530
scsi: mpt3sas: Remove scsi_dma_map() error messages When scsi_dma_map() fails by returning a sges_left value less than zero, the amount of logging produced can be extremely high. In a recentend-user environment, 1200 messages per second were being sent to the log buffer. This eventually overwhelmed the system and it stalled.
These error messages are not needed. Remove them. Link:https://lore.kernel.org/r/20220303140203.12642-1-sreekanth.reddy@broadcom.co... Suggested-by: Christoph Hellwig hch@lst.de Signed-off-by: Sreekanth Reddy sreekanth.reddy@broadcom.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com
We see this regression after upgrading from Linux 5.10 to 5.15 on our file servers with Broadcom/LSI SAS3008 PCI-Express Fusion-MPT SAS-3 (mpt3sas) – though luckily our systems do not stall/crash.
The commit message does not say anything about, what commit caused these error to be appearing – the log statements have been there since v4.20-rc1, if I am not mistaken, so it must be something else –, and also do not mention, why these log messages are not needed, but the new error condition is actually expected.
Now queued up, thanks.
greg k-h