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Muchun Song ee413b2915 io_uring: Fix double list add in io_queue_async_work() 
If we queue work in io_poll_wake(), it will leads to list double
add. So we should add the list when the callback func is the
io_sq_wq_submit_work.

The following oops was seen:

    list_add double add: new=ffff9ca6a8f1b0e0, prev=ffff9ca62001cee8,
    next=ffff9ca6a8f1b0e0.
    ------------[ cut here ]------------
    kernel BUG at lib/list_debug.c:31!
    Call Trace:
     <IRQ>
     io_poll_wake+0xf3/0x230
     __wake_up_common+0x91/0x170
     __wake_up_common_lock+0x7a/0xc0
     io_commit_cqring+0xea/0x280
     ? blkcg_iolatency_done_bio+0x2b/0x610
     io_cqring_add_event+0x3e/0x60
     io_complete_rw+0x58/0x80
     dio_complete+0x106/0x250
     blk_update_request+0xa0/0x3b0
     blk_mq_end_request+0x1a/0x110
     blk_mq_complete_request+0xd0/0xe0
     nvme_irq+0x129/0x270 [nvme]
     __handle_irq_event_percpu+0x7b/0x190
     handle_irq_event_percpu+0x30/0x80
     handle_irq_event+0x3c/0x60
     handle_edge_irq+0x91/0x1e0
     do_IRQ+0x4d/0xd0
     common_interrupt+0xf/0xf

Fixes: 1c4404efcf ("io_uring: make sure async workqueue is canceled on exit")
Reported-by: Jiachen Zhang <zhangjiachen.jaycee@bytedance.com>
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2020-10-14 10:32:57 +02:00
Documentation block/diskstats: more accurate approximation of io_ticks for slow disks 2020-10-07 08:01:29 +02:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch mm: replace memmap_context by meminit_context 2020-10-07 08:01:29 +02:00
block block/diskstats: more accurate approximation of io_ticks for slow disks 2020-10-07 08:01:29 +02:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto crypto: af_alg - Work around empty control messages without MSG_MORE 2020-09-03 11:27:05 +02:00
drivers Revert "ravb: Fixed to be able to unload modules" 2020-10-14 10:32:57 +02:00
fs io_uring: Fix double list add in io_queue_async_work() 2020-10-14 10:32:57 +02:00
include Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts 2020-10-14 10:32:56 +02:00
init kprobes: tracing/kprobes: Fix to kill kprobes on initmem after boot 2020-10-01 13:18:23 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:20:16 +02:00
kernel tracing: Make the space reserved for the pid wider 2020-10-07 08:01:27 +02:00
lib Fonts: Support FONT_EXTRA_WORDS macros for built-in fonts 2020-10-14 10:32:56 +02:00
mm mm: don't rely on system state to detect hot-plug operations 2020-10-07 08:01:30 +02:00
net netfilter: ctnetlink: add a range check for l3/l4 protonum 2020-10-07 08:01:31 +02:00
samples bpf: Fix fds_example SIGSEGV error 2020-08-19 08:16:03 +02:00
scripts scripts/dtc: only append to HOST_EXTRACFLAGS instead of overwriting 2020-10-07 08:01:29 +02:00
security device_cgroup: Fix RCU list debugging warning 2020-10-01 13:18:13 +02:00
sound ALSA: hda/realtek: Enable front panel headset LED on Lenovo ThinkStation P520 2020-10-01 13:18:22 +02:00
tools tools/io_uring: fix compile breakage 2020-10-07 08:01:27 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch 2020-10-01 13:18:25 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
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 Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-08-26 10:40:46 +02:00
Makefile Linux 5.4.70 2020-10-07 08:01:31 +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.