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Eric Dumazet 53e197803d rcu: Avoid data-race in rcu_gp_fqs_check_wake() commit `6935c3983b` upstream. The rcu_gp_fqs_check_wake() function uses rcu_preempt_blocked_readers_cgp() to read ->gp_tasks while other cpus might overwrite this field. We need READ_ONCE()/WRITE_ONCE() pairs to avoid compiler tricks and KCSAN splats like the following : BUG: KCSAN: data-race in rcu_gp_fqs_check_wake / rcu_preempt_deferred_qs_irqrestore write to 0xffffffff85a7f190 of 8 bytes by task 7317 on cpu 0: rcu_preempt_deferred_qs_irqrestore+0x43d/0x580 kernel/rcu/tree_plugin.h:507 rcu_read_unlock_special+0xec/0x370 kernel/rcu/tree_plugin.h:659 __rcu_read_unlock+0xcf/0xe0 kernel/rcu/tree_plugin.h:394 rcu_read_unlock include/linux/rcupdate.h:645 [inline] __ip_queue_xmit+0x3b0/0xa40 net/ipv4/ip_output.c:533 ip_queue_xmit+0x45/0x60 include/net/ip.h:236 __tcp_transmit_skb+0xdeb/0x1cd0 net/ipv4/tcp_output.c:1158 __tcp_send_ack+0x246/0x300 net/ipv4/tcp_output.c:3685 tcp_send_ack+0x34/0x40 net/ipv4/tcp_output.c:3691 tcp_cleanup_rbuf+0x130/0x360 net/ipv4/tcp.c:1575 tcp_recvmsg+0x633/0x1a30 net/ipv4/tcp.c:2179 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_recvmsg+0x92/0xb0 net/socket.c:885 sock_read_iter+0x15f/0x1e0 net/socket.c:967 call_read_iter include/linux/fs.h:1864 [inline] new_sync_read+0x389/0x4f0 fs/read_write.c:414 read to 0xffffffff85a7f190 of 8 bytes by task 10 on cpu 1: rcu_gp_fqs_check_wake kernel/rcu/tree.c:1556 [inline] rcu_gp_fqs_check_wake+0x93/0xd0 kernel/rcu/tree.c:1546 rcu_gp_fqs_loop+0x36c/0x580 kernel/rcu/tree.c:1611 rcu_gp_kthread+0x143/0x220 kernel/rcu/tree.c:1768 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10 Comm: rcu_preempt Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: syzbot <syzkaller@googlegroups.com> [ paulmck: Added another READ_ONCE() for RCU CPU stall warnings. ] Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2020-02-11 04:36:39 -08:00
arch	sparc32: fix struct ipc64_perm type definition	2020-02-11 04:36:34 -08:00
block	block: allow partitions on host aware zone devices	2020-01-26 09:59:08 -07:00
certs	certs: Add wrapper function to check blacklisted binary hash	2019-11-12 12:25:50 +11:00
crypto	crypto: pcrypt - Fix user-after-free on module unload	2020-02-01 09:33:00 +00:00
Documentation	PM / devfreq: Add new name attribute for sysfs	2020-02-04 18:18:01 +00:00
drivers	mfd: dln2: More sanity checking for endpoints	2020-02-11 04:36:38 -08:00
fs	btrfs: do not zero f_bavail if we have available space	2020-02-04 18:18:03 +00:00
include	udp: segment looped gso packets correctly	2020-02-01 09:32:58 +00:00
init	Revert "um: Enable CONFIG_CONSTRUCTORS"	2020-02-01 09:33:00 +00:00
ipc	ipc/msg.c: consolidate all xxxctl_down() functions	2020-02-11 04:36:39 -08:00
kernel	rcu: Avoid data-race in rcu_gp_fqs_check_wake()	2020-02-11 04:36:39 -08:00
lib	lib/test_bitmap: correct test data offsets for 32-bit	2020-02-04 18:18:01 +00:00
LICENSES	LICENSES: Rename other to deprecated	2019-05-03 06:34:32 -06:00
mm	mm/mempolicy.c: fix out of bounds write in mpol_parse_str()	2020-02-04 18:18:01 +00:00
net	netfilter: ipset: fix suspicious RCU usage in find_set_and_id	2020-02-11 04:36:39 -08:00
samples	samples/seccomp: Zero out members based on seccomp_notif_sizes	2020-01-02 13:03:39 -08:00
scripts	ARM fixes for 5.5:	2020-01-25 14:32:51 -08:00
security	tomoyo: Use atomic_t for statistics counter	2020-02-04 18:18:02 +00:00
sound	ALSA: pcm: Fix memory leak at closing a stream without hw_free	2020-02-11 04:36:39 -08:00
tools	tools lib: Fix builds when glibc contains strlcpy()	2020-02-04 18:18:01 +00:00
usr	gen_initramfs_list.sh: fix 'bad variable name' error	2020-01-04 00:00:48 +09:00
virt	PPC KVM fix for 5.5	2019-12-22 13:18:15 +01:00
.clang-format	clang-format: Update with the latest for_each macro list	2019-08-31 10:00:51 +02:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
.mailmap	MAINTAINERS: update my email address	2020-01-11 14:33:39 -08:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Linux 5.4-rc4	2019-10-29 04:43:29 -06:00
Kbuild	kbuild: do not descend to ./Kbuild when cleaning	2019-08-21 21:03:58 +09:00
Kconfig	docs: kbuild: convert docs to ReST and rename to *.rst	2019-06-14 14:21:21 -06:00
MAINTAINERS	MAINTAINERS: correct entries for ISDN/mISDN section	2020-02-11 04:36:38 -08:00
Makefile	Linux 5.5.2	2020-02-04 18:18:03 +00:00
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.