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When ata device doing EH, some commands still attached with tasks are not passed to libata when abort failed or recover failed, so libata did not handle these commands. After these commands done, sas task is freed, but ata qc is not freed. This will cause ata qc leak and trigger a warning like below: WARNING: CPU: 0 PID: 28512 at drivers/ata/libata-eh.c:4037 ata_eh_finish+0xb4/0xcc CPU: 0 PID: 28512 Comm: kworker/u32:2 Tainted: G W OE 4.14.0#1 ...... Call trace: [<ffff0000088b7bd0>] ata_eh_finish+0xb4/0xcc [<ffff0000088b8420>] ata_do_eh+0xc4/0xd8 [<ffff0000088b8478>] ata_std_error_handler+0x44/0x8c [<ffff0000088b8068>] ata_scsi_port_error_handler+0x480/0x694 [<ffff000008875fc4>] async_sas_ata_eh+0x4c/0x80 [<ffff0000080f6be8>] async_run_entry_fn+0x4c/0x170 [<ffff0000080ebd70>] process_one_work+0x144/0x390 [<ffff0000080ec100>] worker_thread+0x144/0x418 [<ffff0000080f2c98>] kthread+0x10c/0x138 [<ffff0000080855dc>] ret_from_fork+0x10/0x18 If ata qc leaked too many, ata tag allocation will fail and io blocked for ever. As suggested by Dan Williams, defer ata device commands to libata and merge sas_eh_finish_cmd() with sas_eh_defer_cmd(). libata will handle ata qcs correctly after this. Signed-off-by: Jason Yan <yanaijie@huawei.com> CC: Xiaofei Tan <tanxiaofei@huawei.com> CC: John Garry <john.garry@huawei.com> CC: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.