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848bd9acdc
The root cause is the race as follows: Thread #0 Thread #1 z_erofs_vle_unzip_kickoff z_erofs_submit_and_unzip struct z_erofs_vle_unzip_io io[] atomic_add_return() wait_event() [end of function] wake_up() Fix it by taking the waitqueue lock between atomic_add_return and wake_up to close such the race. kernel message: Unable to handle kernel paging request at virtual address 97f7052caa1303dc ... Workqueue: kverityd verity_work task: ffffffe32bcb8000 task.stack: ffffffe3298a0000 PC is at __wake_up_common+0x48/0xa8 LR is at __wake_up+0x3c/0x58 ... Call trace: ... [<ffffff94a08ff648>] __wake_up_common+0x48/0xa8 [<ffffff94a08ff8b8>] __wake_up+0x3c/0x58 [<ffffff94a0c11b60>] z_erofs_vle_unzip_kickoff+0x40/0x64 [<ffffff94a0c118e4>] z_erofs_vle_read_endio+0x94/0x134 [<ffffff94a0c83c9c>] bio_endio+0xe4/0xf8 [<ffffff94a1076540>] dec_pending+0x134/0x32c [<ffffff94a1076f28>] clone_endio+0x90/0xf4 [<ffffff94a0c83c9c>] bio_endio+0xe4/0xf8 [<ffffff94a1095024>] verity_work+0x210/0x368 [<ffffff94a08c4150>] process_one_work+0x188/0x4b4 [<ffffff94a08c45bc>] worker_thread+0x140/0x458 [<ffffff94a08cad48>] kthread+0xec/0x108 [<ffffff94a0883ab4>] ret_from_fork+0x10/0x1c Code: d1006273 54000260 f9400804 b9400019 (b85fc081) ---[ end trace be9dde154f677cd1 ]--- Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Gao Xiang <gaoxiang25@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| 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.