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Filename Latest commit message Latest commit date
Zhang Xiaoxu d060386ffd SUNRPC: Fix the batch tasks count wraparound.
commit fcb170a9d825d7db4a3fb870b0300f5a40a8d096 upstream.

The 'queue->nr' will wraparound from 0 to 255 when only current
priority queue has tasks. This maybe lead a deadlock same as commit
dfe1fe75e00e ("NFSv4: Fix deadlock between nfs4_evict_inode()
and nfs4_opendata_get_inode()"):

Privileged delegreturn task is queued to privileged list because all
the slots are assigned. When non-privileged task complete and release
the slot, a non-privileged maybe picked out. It maybe allocate slot
failed when the session on draining.

If the 'queue->nr' has wraparound to 255, and no enough slot to
service it, then the privileged delegreturn will lost to wake up.

So we should avoid the wraparound on 'queue->nr'.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 5fcdfacc01 ("NFSv4: Return delegations synchronously in evict_inode")
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-14 16:53:05 +02:00
arch ARM: dts: at91: sama5d4: fix pinctrl muxing 2021-07-14 16:53:02 +02:00
block
certs
crypto
Documentation
drivers mac80211: remove iwlwifi specific workaround that broke sta NDP tx 2021-07-14 16:53:04 +02:00
fs ext4: use ext4_grp_locked_error in mb_find_extent 2021-07-14 16:53:03 +02:00
include
init
ipc
kernel
lib iov_iter_fault_in_readable() should do nothing in xarray case 2021-07-14 16:53:01 +02:00
LICENSES
mm
net SUNRPC: Fix the batch tasks count wraparound. 2021-07-14 16:53:05 +02:00
samples
scripts
security x86/efi: remove unused variables 2021-07-07 08:22:58 -04:00
sound ALSA: hda/realtek: Apply LED fixup for HP Dragonfly G1, too 2021-07-14 16:52:59 +02:00
tools
usr
virt
.clang-format
.cocciconfig
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Makefile Linux 5.4.131 2021-07-11 12:52:08 +02:00
README

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.