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4790595723
For internal IO and SMP IO, there is a time-out timer for them. In the timer handler, it checks whether IO is done according to the flag task->task_state_lock. There is an issue which may cause system suspended: internal IO or SMP IO is sent, but at that time because of hardware exception (such as inject 2Bit ECC error), so IO is not completed and also not timeout. But, at that time, the SAS controller reset occurs to recover system. It will release the resource and set the status of IO to be SAS_TASK_STATE_DONE, so when IO timeout, it will never complete the completion of IO and wait for ever. [ 729.123632] Call trace: [ 729.126791] [<ffff00000808655c>] __switch_to+0x94/0xa8 [ 729.133106] [<ffff000008d96e98>] __schedule+0x1e8/0x7fc [ 729.138975] [<ffff000008d974e0>] schedule+0x34/0x8c [ 729.144401] [<ffff000008d9b000>] schedule_timeout+0x1d8/0x3cc [ 729.150690] [<ffff000008d98218>] wait_for_common+0xdc/0x1a0 [ 729.157101] [<ffff000008d98304>] wait_for_completion+0x28/0x34 [ 729.165973] [<ffff000000dcefb4>] hisi_sas_internal_task_abort+0x2a0/0x424 [hisi_sas_test_main] [ 729.176447] [<ffff000000dd18f4>] hisi_sas_abort_task+0x244/0x2d8 [hisi_sas_test_main] [ 729.185258] [<ffff000008971714>] sas_eh_handle_sas_errors+0x1c8/0x7b8 [ 729.192391] [<ffff000008972774>] sas_scsi_recover_host+0x130/0x398 [ 729.199237] [<ffff00000894d8a8>] scsi_error_handler+0x148/0x5c0 [ 729.206009] [<ffff0000080f4118>] kthread+0x10c/0x138 [ 729.211563] [<ffff0000080855dc>] ret_from_fork+0x10/0x18 To solve the issue, callback function task_done of those IOs need to be called when on SAS controller reset. Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.