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Siddharth Kawar 943d045a6d SUNRPC: fix shutdown of NFS TCP client socket NFS server Duplicate Request Cache (DRC) algorithms rely on NFS clients reconnecting using the same local TCP port. Unique NFS operations are identified by the per-TCP connection set of XIDs. This prevents file corruption when non-idempotent NFS operations are retried. Currently, NFS client TCP connections are using different local TCP ports when reconnecting to NFS servers. After an NFS server initiates shutdown of the TCP connection, the NFS client's TCP socket is set to NULL after the socket state has reached TCP_LAST_ACK(9). When reconnecting, the new socket attempts to reuse the same local port but fails with EADDRNOTAVAIL (99). This forces the socket to use a different local TCP port to reconnect to the remote NFS server. State Transition and Events: TCP_CLOSE_WAIT(8) TCP_LAST_ACK(9) connect(fail EADDRNOTAVAIL(99)) TCP_CLOSE(7) bind on new port connect success dmesg excerpts showing reconnect switching from TCP local port of 926 to 763 after commit `7c81e6a9d7`: [13354.947854] NFS call mkdir testW ... [13405.654781] RPC: xs_tcp_state_change client 00000000037d0f03... [13405.654813] RPC: state 8 conn 1 dead 0 zapped 1 sk_shutdown 1 [13405.654826] RPC: xs_data_ready... [13405.654892] RPC: xs_tcp_state_change client 00000000037d0f03... [13405.654895] RPC: state 9 conn 0 dead 0 zapped 1 sk_shutdown 3 [13405.654899] RPC: xs_tcp_state_change client 00000000037d0f03... [13405.654900] RPC: state 9 conn 0 dead 0 zapped 1 sk_shutdown 3 [13405.654950] RPC: xs_connect scheduled xprt 00000000037d0f03 [13405.654975] RPC: xs_bind 0.0.0.0:926: ok (0) [13405.654980] RPC: worker connecting xprt 00000000037d0f03 via tcp to 10.101.6.228 (port 2049) [13405.654991] RPC: 00000000037d0f03 connect status 99 connected 0 sock state 7 [13405.655001] RPC: xs_tcp_state_change client 00000000037d0f03... [13405.655002] RPC: state 7 conn 0 dead 0 zapped 1 sk_shutdown 3 [13405.655024] RPC: xs_connect scheduled xprt 00000000037d0f03 [13405.655038] RPC: xs_bind 0.0.0.0:763: ok (0) [13405.655041] RPC: worker connecting xprt 00000000037d0f03 via tcp to 10.101.6.228 (port 2049) [13405.655065] RPC: 00000000037d0f03 connect status 115 connected 0 sock state 2 State Transition and Events with patch applied: TCP_CLOSE_WAIT(8) TCP_LAST_ACK(9) TCP_CLOSE(7) connect(reuse of port succeeds) dmesg excerpts showing reconnect on same TCP local port of 936 with patch applied: [ 257.139935] NFS: mkdir(0:59/560857152), testQ [ 257.139937] NFS call mkdir testQ ... [ 307.822702] RPC: state 8 conn 1 dead 0 zapped 1 sk_shutdown 1 [ 307.822714] RPC: xs_data_ready... [ 307.822817] RPC: xs_tcp_state_change client 00000000ce702f14... [ 307.822821] RPC: state 9 conn 0 dead 0 zapped 1 sk_shutdown 3 [ 307.822825] RPC: xs_tcp_state_change client 00000000ce702f14... [ 307.822826] RPC: state 9 conn 0 dead 0 zapped 1 sk_shutdown 3 [ 307.823606] RPC: xs_tcp_state_change client 00000000ce702f14... [ 307.823609] RPC: state 7 conn 0 dead 0 zapped 1 sk_shutdown 3 [ 307.823629] RPC: xs_tcp_state_change client 00000000ce702f14... [ 307.823632] RPC: state 7 conn 0 dead 0 zapped 1 sk_shutdown 3 [ 307.823676] RPC: xs_connect scheduled xprt 00000000ce702f14 [ 307.823704] RPC: xs_bind 0.0.0.0:936: ok (0) [ 307.823709] RPC: worker connecting xprt 00000000ce702f14 via tcp to 10.101.1.30 (port 2049) [ 307.823748] RPC: 00000000ce702f14 connect status 115 connected 0 sock state 2 ... [ 314.916193] RPC: state 7 conn 0 dead 0 zapped 1 sk_shutdown 3 [ 314.916251] RPC: xs_connect scheduled xprt 00000000ce702f14 [ 314.916282] RPC: xs_bind 0.0.0.0:936: ok (0) [ 314.916292] RPC: worker connecting xprt 00000000ce702f14 via tcp to 10.101.1.30 (port 2049) [ 314.916342] RPC: 00000000ce702f14 connect status 115 connected 0 sock state 2 Fixes: `7c81e6a9d7` ("SUNRPC: Tweak TCP socket shutdown in the RPC client") Signed-off-by: Siddharth Rajendra Kawar <sikawar@microsoft.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>		History 2023-03-23 15:50:16 -04:00
arch	- Disable XSAVES on AMD Zen1 and Zen2 machines due to an erratum. No	2023-03-12 09:12:03 -07:00
block	block, bfq: fix uaf for 'stable_merge_bfqq'	2023-03-08 07:34:50 -07:00
certs	Kbuild updates for v6.3	2023-02-26 11:53:25 -08:00
crypto	Networking changes for 6.3.	2023-02-21 18:24:12 -08:00
Documentation	Bug fixes and regressions for ext4, the most serious of which is a	2023-03-12 08:55:55 -07:00
drivers	tpm: disable hwrng for fTPM on some AMD designs	2023-03-12 23:28:10 +02:00
fs	NFSv4: Fix hangs when recovering open state after a server reboot	2023-03-22 16:22:35 -04:00
include	lockd: set file_lock start and end when decoding nlm4 testargs	2023-03-14 14:00:55 -04:00
init	Kbuild updates for v6.3	2023-02-26 11:53:25 -08:00
io_uring	io_uring: silence variable ‘prev’ set but not used warning	2023-03-09 10:10:58 -07:00
ipc	Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2023-02-24 19:20:07 -08:00
kernel	kernel.fork.v6.3-rc2	2023-03-12 09:04:28 -07:00
lib	cpumask: re-introduce constant-sized cpumask optimizations	2023-03-05 14:30:34 -08:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	mm: avoid gcc complaint about pointer casting	2023-03-04 14:03:27 -08:00
net	SUNRPC: fix shutdown of NFS TCP client socket	2023-03-23 15:50:16 -04:00
rust	Rust fixes for 6.3-rc1	2023-03-03 14:51:15 -08:00
samples	LoongArch changes for v6.3	2023-03-01 09:27:00 -08:00
scripts	Remove Intel compiler support	2023-03-05 10:49:37 -08:00
security	capability: just use a 'u64' instead of a 'u32[2]' array	2023-03-01 10:01:22 -08:00
sound	sound fixes for 6.3-rc1	2023-03-04 10:53:59 -08:00
tools	kernel.fork.v6.3-rc2	2023-03-12 09:04:28 -07:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM/riscv changes for 6.3	2023-02-15 12:33:28 -05:00
.clang-format	cpumask: re-introduce constant-sized cpumask optimizations	2023-03-05 14:30:34 -08:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for *.dtso files	2023-02-26 15:28:23 +09:00
.gitignore	.gitignore: ignore .cover and .mbx	2023-02-05 18:51:22 +09:00
.mailmap	drm fixes for 6.3-rc2	2023-03-10 08:57:46 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	There is no particular theme here - mainly quick hits all over the tree.	2023-02-23 17:55:40 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Staging driver fixes and removal for 6.3-rc2	2023-03-12 09:17:30 -07:00
Makefile	Linux 6.3-rc2	2023-03-12 16:36:44 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.