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Filename Latest commit message Latest commit date
Trond Myklebust 34769f17e4 NFSv4: Fix deadlock between nfs4_evict_inode() and nfs4_opendata_get_inode() 
[ Upstream commit dfe1fe75e00e4c724ede7b9e593f6f680e446c5f ]

If the inode is being evicted, but has to return a delegation first,
then it can cause a deadlock in the corner case where the server reboots
before the delegreturn completes, but while the call to iget5_locked() in
nfs4_opendata_get_inode() is waiting for the inode free to complete.
Since the open call still holds a session slot, the reboot recovery
cannot proceed.

In order to break the logjam, we can turn the delegation return into a
privileged operation for the case where we're evicting the inode. We
know that in that case, there can be no other state recovery operation
that conflicts.

Reported-by: zhangxiaoxu (A) <zhangxiaoxu5@huawei.com>
Fixes: 5fcdfacc01 ("NFSv4: Return delegations synchronously in evict_inode")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-06-16 11:59:44 +02:00
arch KVM: x86: Ensure liveliness of nested VM-Enter fail tracepoint message 2021-06-16 11:59:44 +02:00
block blk-mq: Swap two calls in blk_mq_exit_queue() 2021-05-19 10:08:30 +02:00
certs
crypto
Documentation XArray: add xas_split 2021-06-10 13:37:14 +02:00
drivers IB/mlx5: Fix initializing CQ fragments buffer 2021-06-16 11:59:44 +02:00
fs NFSv4: Fix deadlock between nfs4_evict_inode() and nfs4_opendata_get_inode() 2021-06-16 11:59:44 +02:00
include vmlinux.lds.h: Avoid orphan section with !SMP 2021-06-16 11:59:44 +02:00
init pid: take a reference when initializing cad_pid 2021-06-10 13:37:11 +02:00
ipc
kernel sched/fair: Make sure to update tg contrib for blocked load 2021-06-16 11:59:44 +02:00
lib lib/lz4: explicitly support in-place decompression 2021-06-10 13:37:16 +02:00
LICENSES
mm mm/filemap: fix storing to a THP shadow entry 2021-06-10 13:37:15 +02:00
net RDS tcp loopback connection can hang 2021-06-16 11:59:35 +02:00
samples samples: vfio-mdev: fix error handing in mdpy_fb_probe() 2021-06-10 13:37:03 +02:00
scripts scripts: switch explicitly to Python 3 2021-05-22 11:38:30 +02:00
security
sound ASoC: sti-sas: add missing MODULE_DEVICE_TABLE 2021-06-16 11:59:33 +02:00
tools perf jevents: Fix getting maximum number of fds 2021-06-03 08:59:08 +02:00
usr
virt KVM: arm64: Initialize VCPU mdcr_el2 before loading it 2021-05-22 11:38:30 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
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COPYING
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Kconfig
MAINTAINERS
Makefile Linux 5.4.125 2021-06-10 13:37:17 +02:00
README

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.