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Shigeru Yoshida 9027d69221 rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic() [ Upstream commit `5fc8cbe4cf` ] pr_info() is called with rtp->cbs_gbl_lock spin lock locked. Because pr_info() calls printk() that might sleep, this will result in BUG like below: [ 0.206455] cblist_init_generic: Setting adjustable number of callback queues. [ 0.206463] [ 0.206464] ============================= [ 0.206464] [ BUG: Invalid wait context ] [ 0.206465] 5.19.0-00428-g9de1f9c8ca51 #5 Not tainted [ 0.206466] ----------------------------- [ 0.206466] swapper/0/1 is trying to lock: [ 0.206467] ffffffffa0167a58 (&port_lock_key){....}-{3:3}, at: serial8250_console_write+0x327/0x4a0 [ 0.206473] other info that might help us debug this: [ 0.206473] context-{5:5} [ 0.206474] 3 locks held by swapper/0/1: [ 0.206474] #0: ffffffff9eb597e0 (rcu_tasks.cbs_gbl_lock){....}-{2:2}, at: cblist_init_generic.constprop.0+0x14/0x1f0 [ 0.206478] #1: ffffffff9eb579c0 (console_lock){+.+.}-{0:0}, at: _printk+0x63/0x7e [ 0.206482] #2: ffffffff9ea77780 (console_owner){....}-{0:0}, at: console_emit_next_record.constprop.0+0x111/0x330 [ 0.206485] stack backtrace: [ 0.206486] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-00428-g9de1f9c8ca51 #5 [ 0.206488] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-1.fc36 04/01/2014 [ 0.206489] Call Trace: [ 0.206490] <TASK> [ 0.206491] dump_stack_lvl+0x6a/0x9f [ 0.206493] __lock_acquire.cold+0x2d7/0x2fe [ 0.206496] ? stack_trace_save+0x46/0x70 [ 0.206497] lock_acquire+0xd1/0x2f0 [ 0.206499] ? serial8250_console_write+0x327/0x4a0 [ 0.206500] ? __lock_acquire+0x5c7/0x2720 [ 0.206502] _raw_spin_lock_irqsave+0x3d/0x90 [ 0.206504] ? serial8250_console_write+0x327/0x4a0 [ 0.206506] serial8250_console_write+0x327/0x4a0 [ 0.206508] console_emit_next_record.constprop.0+0x180/0x330 [ 0.206511] console_unlock+0xf7/0x1f0 [ 0.206512] vprintk_emit+0xf7/0x330 [ 0.206514] _printk+0x63/0x7e [ 0.206516] cblist_init_generic.constprop.0.cold+0x24/0x32 [ 0.206518] rcu_init_tasks_generic+0x5/0xd9 [ 0.206522] kernel_init_freeable+0x15b/0x2a2 [ 0.206523] ? rest_init+0x160/0x160 [ 0.206526] kernel_init+0x11/0x120 [ 0.206527] ret_from_fork+0x1f/0x30 [ 0.206530] </TASK> [ 0.207018] cblist_init_generic: Setting shift to 1 and lim to 1. This patch moves pr_info() so that it is called without rtp->cbs_gbl_lock locked. Signed-off-by: Shigeru Yoshida <syoshida@redhat.com> Tested-by: "Zhang, Qiang1" <qiang1.zhang@intel.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-07-27 08:50:33 +02:00
Documentation	dm init: add dm-mod.waitfor to wait for asynchronously probed block devices	2023-07-23 13:49:38 +02:00
LICENSES	…
arch	MIPS: dec: prom: Address -Warray-bounds warning	2023-07-27 08:50:33 +02:00
block	blk-crypto: use dynamic lock class for blk_crypto_profile::lock	2023-07-23 13:49:21 +02:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: jitter - correct health test during initialization	2023-07-19 16:21:42 +02:00
drivers	ACPI: video: Add backlight=native DMI quirk for Dell Studio 1569	2023-07-27 08:50:33 +02:00
fs	FS: JFS: Check for read-only mounted filesystem in txBegin	2023-07-27 08:50:33 +02:00
include	fprobe: Ensure running fprobe_exit_handler() finished before calling rethook_free()	2023-07-23 13:49:46 +02:00
init	gcc: disable '-Warray-bounds' for gcc-13 too	2023-04-26 14:28:43 +02:00
io_uring	io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq	2023-07-27 08:50:23 +02:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	rcu-tasks: Avoid pr_info() with spin lock in cblist_init_generic()	2023-07-27 08:50:33 +02:00
lib	maple_tree: set the node limit when creating a new root node	2023-07-27 08:50:24 +02:00
mm	kasan: add kasan_tag_mismatch prototype	2023-07-23 13:49:32 +02:00
net	can: bcm: Fix UAF in bcm_proc_show()	2023-07-27 08:50:27 +02:00
rust	rust: kernel: Mark rust_fmt_argument as extern "C"	2023-04-26 14:28:38 +02:00
samples	samples: ftrace: Save required argument registers in sample trampolines	2023-07-23 13:49:44 +02:00
scripts	kbuild: Disable GCOV for *.mod.o	2023-07-19 16:21:44 +02:00
security	keys: Fix linking a duplicate key to a keyring's assoc_array	2023-07-27 08:50:24 +02:00
sound	ALSA: emu10k1: roll up loops in DSP setup code for Audigy	2023-07-27 08:50:31 +02:00
tools	selftests: tc: add ConnTrack procfs kconfig	2023-07-27 08:50:27 +02:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM: Avoid illegal stage2 mapping on invalid memory slot	2023-06-28 11:12:23 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	…
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	…
COPYING	…
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	…
MAINTAINERS	smb: move client and server files to common directory fs/smb	2023-06-28 11:12:40 +02:00
Makefile	Linux 6.1.41	2023-07-24 18:55:35 +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.