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On a 16 node virtual cluster with e1000 NICs joining the 12th node prints SYN flood warnings for the DLM port: Dec 21 01:46:41 localhost kernel: [ 2146.516664] TCP: request_sock_TCP: Possible SYN flooding on port 21064. Sending cookies. Check SNMP counters. And then joining a DLM lockspace hangs: ``` Dec 21 01:49:00 localhost kernel: [ 2285.780913] INFO: task xapi-clusterd:17638 blocked for more than 120 seconds. Dec 21 01:49:00 localhost kernel: [ 2285.786476] Not tainted 4.4.0+10 #1 Dec 21 01:49:00 localhost kernel: [ 2285.789043] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Dec 21 01:49:00 localhost kernel: [ 2285.794611] xapi-clusterd D ffff88001930bc58 0 17638 1 0x00000000 Dec 21 01:49:00 localhost kernel: [ 2285.794615] ffff88001930bc58 ffff880025593800 ffff880022433800 ffff88001930c000 Dec 21 01:49:00 localhost kernel: [ 2285.794617] ffff88000ef4a660 ffff88000ef4a658 ffff880022433800 ffff88000ef4a000 Dec 21 01:49:00 localhost kernel: [ 2285.794619] ffff88001930bc70 ffffffff8159f6b4 7fffffffffffffff ffff88001930bd10 Dec 21 01:49:00 localhost kernel: [ 2285.794644] [<ffffffff811570fe>] ? printk+0x4d/0x4f Dec 21 01:49:00 localhost kernel: [ 2285.794647] [<ffffffff810b1741>] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20 Dec 21 01:49:00 localhost kernel: [ 2285.794649] [<ffffffff815a085d>] wait_for_completion+0x9d/0x110 Dec 21 01:49:00 localhost kernel: [ 2285.794653] [<ffffffff810979e0>] ? wake_up_q+0x80/0x80 Dec 21 01:49:00 localhost kernel: [ 2285.794661] [<ffffffffa03fa4b8>] dlm_new_lockspace+0x908/0xac0 [dlm] Dec 21 01:49:00 localhost kernel: [ 2285.794665] [<ffffffff810aaa60>] ? prepare_to_wait_event+0x100/0x100 Dec 21 01:49:00 localhost kernel: [ 2285.794670] [<ffffffffa0402e37>] device_write+0x497/0x6b0 [dlm] Dec 21 01:49:00 localhost kernel: [ 2285.794673] [<ffffffff811834f0>] ? handle_mm_fault+0x7f0/0x13b0 Dec 21 01:49:00 localhost kernel: [ 2285.794677] [<ffffffff811b4438>] __vfs_write+0x28/0xd0 Dec 21 01:49:00 localhost kernel: [ 2285.794679] [<ffffffff811b4b7f>] ? rw_verify_area+0x6f/0xd0 Dec 21 01:49:00 localhost kernel: [ 2285.794681] [<ffffffff811b4dc1>] vfs_write+0xb1/0x190 Dec 21 01:49:00 localhost kernel: [ 2285.794686] [<ffffffff8105ffc2>] ? __do_page_fault+0x302/0x420 Dec 21 01:49:00 localhost kernel: [ 2285.794688] [<ffffffff811b5986>] SyS_write+0x46/0xa0 Dec 21 01:49:00 localhost kernel: [ 2285.794690] [<ffffffff815a31ae>] entry_SYSCALL_64_fastpath+0x12/0x71 ``` The previous limit of 5 seems like an arbitrary number, that doesn't match any known DLM cluster size upper bound limit. Signed-off-by: Edwin Török <edvin.torok@citrix.com> Cc: Christine Caulfield <ccaulfie@redhat.com> Cc: David Teigland <teigland@redhat.com> Cc: cluster-devel@redhat.com Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
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.