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c2dd893a3b
If multiple tasks attempt to read the stats, it may happen that the start_req_done completion is re-initialized while still being used by another task, causing a list corruption. This patch fixes the bug by adding a mutex to serialize the calls to bnx2fc_get_host_stats(). WARNING: at lib/list_debug.c:48 list_del+0x6e/0xa0() (Not tainted) Hardware name: PowerEdge R820 list_del corruption. prev->next should be ffff882035627d90, but was ffff884069541588 Pid: 40267, comm: perl Not tainted 2.6.32-642.3.1.el6.x86_64 #1 Call Trace: [<ffffffff8107c691>] ? warn_slowpath_common+0x91/0xe0 [<ffffffff8107c796>] ? warn_slowpath_fmt+0x46/0x60 [<ffffffff812ad16e>] ? list_del+0x6e/0xa0 [<ffffffff81547eed>] ? wait_for_common+0x14d/0x180 [<ffffffff8106c4a0>] ? default_wake_function+0x0/0x20 [<ffffffff81547fd3>] ? wait_for_completion_timeout+0x13/0x20 [<ffffffffa05410b1>] ? bnx2fc_get_host_stats+0xa1/0x280 [bnx2fc] [<ffffffffa04cf630>] ? fc_stat_show+0x90/0xc0 [scsi_transport_fc] [<ffffffffa04cf8b6>] ? show_fcstat_tx_frames+0x16/0x20 [scsi_transport_fc] [<ffffffff8137c647>] ? dev_attr_show+0x27/0x50 [<ffffffff8113b9be>] ? __get_free_pages+0xe/0x50 [<ffffffff812170e1>] ? sysfs_read_file+0x111/0x200 [<ffffffff8119a305>] ? vfs_read+0xb5/0x1a0 [<ffffffff8119b0b6>] ? fget_light_pos+0x16/0x50 [<ffffffff8119a651>] ? sys_read+0x51/0xb0 [<ffffffff810ee1fe>] ? __audit_syscall_exit+0x25e/0x290 [<ffffffff8100b0d2>] ? system_call_fastpath+0x16/0x1b Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> Acked-by: Chad Dupuis <chad.dupuis@cavium.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.