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Linux kernel source tree
5523508258
Replace `dev_kfree_skb()` with `dev_kfree_skb_any()` in `start_xmit()`
which can be called from netpoll (hard IRQ) and from other contexts.
Also, `np->link_status` can be changed at any time by interrupt handler.
<idle>-0 [011] dNh4. 4541.754603: start_xmit <-netpoll_start_xmit
<idle>-0 [011] dNh4. 4541.754622: <stack trace>
=> [FTRACE TRAMPOLINE]
=> start_xmit
=> netpoll_start_xmit
=> netpoll_send_skb
=> write_msg
=> console_flush_all
=> console_unlock
=> vprintk_emit
=> _printk
=> rio_interrupt
=> __handle_irq_event_percpu
=> handle_irq_event
=> handle_fasteoi_irq
=> __common_interrupt
=> common_interrupt
=> asm_common_interrupt
=> mwait_idle
=> default_idle_call
=> do_idle
=> cpu_startup_entry
=> start_secondary
=> common_startup_64
This issue can occur when the link state changes from off to on
(e.g., plugging or unplugging the LAN cable) while transmitting a
packet. If the skb has a destructor, a warning message may be
printed in this situation.
-> consume_skb (dev_kfree_skb())
-> __kfree_skb()
-> skb_release_all()
-> skb_release_head_state(skb)
if (skb->destructor) {
DEBUG_NET_WARN_ON_ONCE(in_hardirq());
skb->destructor(skb);
}
Found by inspection.
Signed-off-by: Yeounsu Moon <yyyynoom@gmail.com>
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| 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 reStructuredText 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.