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Soft lockups can occur because the mad processing on different CPUs acquire the spin lock dc8051_lock: [534552.835870] [<ffffffffa026f993>] ? read_dev_port_cntr.isra.37+0x23/0x160 [hfi1] [534552.835880] [<ffffffffa02775af>] read_dev_cntr+0x4f/0x60 [hfi1] [534552.835893] [<ffffffffa028d7cd>] pma_get_opa_portstatus+0x64d/0x8c0 [hfi1] [534552.835904] [<ffffffffa0290e7d>] hfi1_process_mad+0x48d/0x18c0 [hfi1] [534552.835908] [<ffffffff811dc1f1>] ? __slab_free+0x81/0x2f0 [534552.835936] [<ffffffffa024c34e>] ? ib_mad_recv_done+0x21e/0xa30 [ib_core] [534552.835939] [<ffffffff811dd153>] ? __kmalloc+0x1f3/0x240 [534552.835947] [<ffffffffa024c3fb>] ib_mad_recv_done+0x2cb/0xa30 [ib_core] [534552.835955] [<ffffffffa0237c85>] __ib_process_cq+0x55/0xd0 [ib_core] [534552.835962] [<ffffffffa0237d70>] ib_cq_poll_work+0x20/0x60 [ib_core] [534552.835964] [<ffffffff810a7f3b>] process_one_work+0x17b/0x470 [534552.835966] [<ffffffff810a8d76>] worker_thread+0x126/0x410 [534552.835969] [<ffffffff810a8c50>] ? rescuer_thread+0x460/0x460 [534552.835971] [<ffffffff810b052f>] kthread+0xcf/0xe0 [534552.835974] [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140 [534552.835977] [<ffffffff81696418>] ret_from_fork+0x58/0x90 [534552.835980] [<ffffffff810b0460>] ? kthread_create_on_node+0x140/0x140 This issue is made worse when the 8051 is busy and the reads take longer. Fix by using a non-spinning lock procure. Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Reviewed-by: Mike Marciszyn <mike.marciniszyn@intel.com> Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com> |
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| README | ||
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.