mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-01 08:04:22 +08:00
8eb06d7e8d
There is a fancy bug, where exiting user task may not have ->mm, that makes task_works to try to do kthread_use_mm(ctx->sqo_mm). Don't do that if sqo_mm is NULL. [ 290.460558] WARNING: CPU: 6 PID: 150933 at kernel/kthread.c:1238 kthread_use_mm+0xf3/0x110 [ 290.460579] CPU: 6 PID: 150933 Comm: read-write2 Tainted: G I E 5.8.0-rc2-00066-g9b21720607cf #531 [ 290.460580] RIP: 0010:kthread_use_mm+0xf3/0x110 ... [ 290.460584] Call Trace: [ 290.460584] __io_sq_thread_acquire_mm.isra.0.part.0+0x25/0x30 [ 290.460584] __io_req_task_submit+0x64/0x80 [ 290.460584] io_req_task_submit+0x15/0x20 [ 290.460585] task_work_run+0x67/0xa0 [ 290.460585] do_exit+0x35d/0xb70 [ 290.460585] do_group_exit+0x43/0xa0 [ 290.460585] get_signal+0x140/0x900 [ 290.460586] do_signal+0x37/0x780 [ 290.460586] __prepare_exit_to_usermode+0x126/0x1c0 [ 290.460586] __syscall_return_slowpath+0x3b/0x1c0 [ 290.460587] do_syscall_64+0x5f/0xa0 [ 290.460587] entry_SYSCALL_64_after_hwframe+0x44/0xa9 following with faults. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.