1bfdb812c7
iflib_stop modifies iflib data structures that are used by _task_fn_rx, most prominently the free lists. So, iflib_stop has to ensure that the rx task threads are not active. This should help to fix a crash seen when iflib_if_ioctl (e.g., SIOCSIFCAP) is called while there is already traffic flowing. The crash has been seen on VMWare guests with vmxnet3 driver. My guess is that on physical hardware the couple of 1ms delays that iflib_stop has after disabling interrupts are enough for the queued work to be completed before any iflib state is touched. But on busy hypervisors the guests might not get enough CPU time to complete the work, thus there can be a race between the taskqueue threads and the work done to handle an ioctl, specifically in iflib_stop and iflib_init_locked. PR: 259458 Reviewed by: markj MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D32926
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Various commands and libraries under the Common Development and Distribution License. |
| contrib | Packages contributed by 3rd parties. |
| crypto | Cryptography stuff (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Various commands and libraries under the GNU Public License. Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Kerberos5 (Heimdal) package. |
| lib | System libraries. |
| libexec | System daemons. |
| release | Release building Makefile & associated tools. |
| rescue | Build system for statically linked /rescue utilities. |
| sbin | System commands. |
| secure | Cryptographic libraries and commands. |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources. |
sys/arch/conf |
Kernel configuration files. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. |
| tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
| tools | Utilities for regression testing and miscellaneous tasks. |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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