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Pablo Neira Ayuso 120f1c857a net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE The following splat is easy to reproduce upstream as well as in -stable kernels. Florian Westphal provided the following commit: `d1dab4f71d` ("net: add and use __skb_get_hash_symmetric_net") but this complementary fix has been also suggested by Willem de Bruijn and it can be easily backported to -stable kernel which consists in using DEBUG_NET_WARN_ON_ONCE instead to silence the following splat given __skb_get_hash() is used by the nftables tracing infrastructure to to identify packets in traces. [69133.561393] ------------[ cut here ]------------ [69133.561404] WARNING: CPU: 0 PID: 43576 at net/core/flow_dissector.c:1104 __skb_flow_dissect+0x134f/ [...] [69133.561944] CPU: 0 PID: 43576 Comm: socat Not tainted 6.10.0-rc7+ #379 [69133.561959] RIP: 0010:__skb_flow_dissect+0x134f/0x2ad0 [69133.561970] Code: 83 f9 04 0f 84 b3 00 00 00 45 85 c9 0f 84 aa 00 00 00 41 83 f9 02 0f 84 81 fc ff ff 44 0f b7 b4 24 80 00 00 00 e9 8b f9 ff ff <0f> 0b e9 20 f3 ff ff 41 f6 c6 20 0f 84 e4 ef ff ff 48 8d 7b 12 e8 [69133.561979] RSP: 0018:ffffc90000006fc0 EFLAGS: 00010246 [69133.561988] RAX: 0000000000000000 RBX: ffffffff82f33e20 RCX: ffffffff81ab7e19 [69133.561994] RDX: dffffc0000000000 RSI: ffffc90000007388 RDI: ffff888103a1b418 [69133.562001] RBP: ffffc90000007310 R08: 0000000000000000 R09: 0000000000000000 [69133.562007] R10: ffffc90000007388 R11: ffffffff810cface R12: ffff888103a1b400 [69133.562013] R13: 0000000000000000 R14: ffffffff82f33e2a R15: ffffffff82f33e28 [69133.562020] FS: 00007f40f7131740(0000) GS:ffff888390800000(0000) knlGS:0000000000000000 [69133.562027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [69133.562033] CR2: 00007f40f7346ee0 CR3: 000000015d200001 CR4: 00000000001706f0 [69133.562040] Call Trace: [69133.562044] <IRQ> [69133.562049] ? __warn+0x9f/0x1a0 [ 1211.841384] ? __skb_flow_dissect+0x107e/0x2860 [...] [ 1211.841496] ? bpf_flow_dissect+0x160/0x160 [ 1211.841753] __skb_get_hash+0x97/0x280 [ 1211.841765] ? __skb_get_hash_symmetric+0x230/0x230 [ 1211.841776] ? mod_find+0xbf/0xe0 [ 1211.841786] ? get_stack_info_noinstr+0x12/0xe0 [ 1211.841798] ? bpf_ksym_find+0x56/0xe0 [ 1211.841807] ? __rcu_read_unlock+0x2a/0x70 [ 1211.841819] nft_trace_init+0x1b9/0x1c0 [nf_tables] [ 1211.841895] ? nft_trace_notify+0x830/0x830 [nf_tables] [ 1211.841964] ? get_stack_info+0x2b/0x80 [ 1211.841975] ? nft_do_chain_arp+0x80/0x80 [nf_tables] [ 1211.842044] nft_do_chain+0x79c/0x850 [nf_tables] Fixes: `9b52e3f267` ("flow_dissector: handle no-skb use case") Suggested-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://patch.msgid.link/20240715141442.43775-1-pablo@netfilter.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>		2024-07-18 10:52:17 +02:00
arch	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
block	for-6.11/block-20240710	2024-07-15 14:20:22 -07:00
certs	kbuild: use $(src) instead of $(srctree)/$(src) for source directory	2024-05-10 04:34:52 +09:00
crypto	This push fixes a bug in the new ecc P521 code as well as a buggy	2024-05-20 08:47:54 -07:00
Documentation	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
drivers	net: airoha: fix error branch in airoha_dev_xmit and airoha_set_gdm_ports	2024-07-17 22:11:55 -07:00
fs	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
include	driver core: auxiliary bus: Fix documentation of auxiliary_device	2024-07-17 22:13:12 -07:00
init	gcc: disable '-Warray-bounds' for gcc-9	2024-06-15 10:43:04 -07:00
io_uring	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
ipc	ipc: mqueue: remove assignment from IS_ERR argument	2024-07-09 06:47:40 +02:00
kernel	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
lib	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	linux_kselftest-kunit-6.11-rc1	2024-07-16 17:42:14 -07:00
net	net: flow_dissector: use DEBUG_NET_WARN_ON_ONCE	2024-07-18 10:52:17 +02:00
rust	for-6.11/block-20240710	2024-07-15 14:20:22 -07:00
samples	bpf-next-for-netdev	2024-05-28 07:27:29 -07:00
scripts	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
security	Performance events changes for v6.11:	2024-07-16 17:13:31 -07:00
sound	Updates for timers, timekeeping and related functionality:	2024-07-15 15:03:09 -07:00
tools	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
usr	kbuild: use $(src) instead of $(srctree)/$(src) for source directory	2024-05-10 04:34:52 +09:00
virt	KVM fixes for 6.10	2024-06-21 08:03:55 -04:00
.clang-format	clang-format: Update with v6.7-rc4's `for_each` macro list	2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig	.editorconfig: remove trim_trailing_whitespace option	2024-06-13 16:47:52 +02:00
.get_maintainer.ignore	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: create a list of all built DTB files	2024-02-19 18:20:39 +09:00
.mailmap	soc: dt updates for 6.11	2024-07-16 11:43:51 -07:00
.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	Scheduler changes for v6.11:	2024-07-16 17:00:50 -07:00
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	Networking changes for 6.11. Not much excitement - a handful of large	2024-07-16 19:28:34 -07:00
Makefile	asm-generic updates for 6.11	2024-07-16 12:09:03 -07:00
README	README: Fix spelling	2024-03-18 03:36:32 -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 reStructuredText 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.