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Ming Lei d578c770c8 block: avoid calling blkg_free() in atomic context 
blkg_free() can currently be called in atomic context, either spin lock is
held, or run in rcu callback. Meantime either request queue's release
handler or ->pd_free_fn can sleep.

Fix the issue by scheduling a work function for freeing blkcg_gq the
instance.

[  148.553894] BUG: sleeping function called from invalid context at block/blk-sysfs.c:767
[  148.557381] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/13
[  148.560741] preempt_count: 101, expected: 0
[  148.562577] RCU nest depth: 0, expected: 0
[  148.564379] 1 lock held by swapper/13/0:
[  148.566127]  #0: ffffffff82615f80 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire+0x0/0x1b
[  148.569640] Preemption disabled at:
[  148.569642] [<ffffffff8123f9c3>] ___slab_alloc+0x554/0x661
[  148.573559] CPU: 13 PID: 0 Comm: swapper/13 Kdump: loaded Not tainted 5.17.0_up+ #110
[  148.576834] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-1.fc33 04/01/2014
[  148.579768] Call Trace:
[  148.580567]  <IRQ>
[  148.581262]  dump_stack_lvl+0x56/0x7c
[  148.582367]  ? ___slab_alloc+0x554/0x661
[  148.583526]  __might_resched+0x1af/0x1c8
[  148.584678]  blk_release_queue+0x24/0x109
[  148.585861]  kobject_cleanup+0xc9/0xfe
[  148.586979]  blkg_free+0x46/0x63
[  148.587962]  rcu_do_batch+0x1c5/0x3db
[  148.589057]  rcu_core+0x14a/0x184
[  148.590065]  __do_softirq+0x14d/0x2c7
[  148.591167]  __irq_exit_rcu+0x7a/0xd4
[  148.592264]  sysvec_apic_timer_interrupt+0x82/0xa5
[  148.593649]  </IRQ>
[  148.594354]  <TASK>
[  148.595058]  asm_sysvec_apic_timer_interrupt+0x12/0x20

Cc: Tejun Heo <tj@kernel.org>
Fixes: 0a9a25ca78 ("block: let blkcg_gq grab request queue's refcnt")
Reported-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/linux-block/20220322093322.GA27283@lst.de/
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20220323011308.2010380-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-03-22 19:52:23 -06:00
arch block: remove genhd.h 2022-02-02 07:49:59 -07:00
block block: avoid calling blkg_free() in atomic context 2022-03-22 19:52:23 -06:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto lib/crypto: add prompts back to crypto libraries 2022-01-18 13:03:55 +01:00
Documentation blk-crypto: show crypto capabilities in sysfs 2022-02-28 06:40:23 -07:00
drivers sr: simplify the local variable initialization in sr_block_open() 2022-03-15 14:41:59 -06:00
fs ext4: stop using bio_devname 2022-03-07 06:42:33 -07:00
include block: avoid calling blkg_free() in atomic context 2022-03-22 19:52:23 -06:00
init block: remove genhd.h 2022-02-02 07:49:59 -07:00
ipc proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
kernel block: check that there is a plug in blk_flush_plug 2022-02-02 07:50:00 -07:00
lib lib/sbitmap: allocate sb->map via kvzalloc_node 2022-03-21 20:01:34 -06:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm block: pass a block_device and opf to bio_alloc 2022-02-02 07:49:59 -07:00
net \n 2022-01-28 17:51:31 +02:00
samples Merge branch 'akpm' (patches from Andrew) 2022-01-20 10:41:01 +02:00
scripts ftrace: Have architectures opt-in for mcount build time sorting 2022-01-27 19:15:44 -05:00
security block: remove genhd.h 2022-02-02 07:49:59 -07:00
sound proc: remove PDE_DATA() completely 2022-01-22 08:33:37 +02:00
tools tools/testing/scatterlist: add missing defines 2022-01-30 09:56:58 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt Two larger x86 series: 2022-01-28 19:00:26 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address of Brian Silverman 2022-01-24 18:27:23 +01:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Removing Ohad from remoteproc/rpmsg maintenance 2021-12-08 10:09:40 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: add bio.h to the block section 2022-02-02 07:50:00 -07:00
Makefile Linux 5.17-rc2 2022-01-30 15:37:07 +02:00
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.