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Jiri Pirko e57d397bff RDMA/core: Fix stale RoCE GIDs during netdev events at registration 
[ Upstream commit 9af0feae80 ]

RoCE GID entries become stale when netdev properties change during the
IB device registration window. This is reproducible with a udev rule
that sets a MAC address when a VF netdev appears:

  ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth4", \
    RUN+="/sbin/ip link set eth4 address 88:22:33:44:55:66"

After VF creation, show_gids displays GIDs derived from the original
random MAC rather than the configured one.

The root cause is a race between netdev event processing and device
registration:

  CPU 0 (driver)                    CPU 1 (udev/workqueue)
  ──────────────                    ──────────────────────
  ib_register_device()
    ib_cache_setup_one()
      gid_table_setup_one()
        _gid_table_setup_one()
          ← GID table allocated
        rdma_roce_rescan_device()
          ← GIDs populated with
            OLD MAC
                                    ip link set eth4 addr NEW_MAC
                                    NETDEV_CHANGEADDR queued
                                    netdevice_event_work_handler()
                                      ib_enum_all_roce_netdevs()
                                        ← Iterates DEVICE_REGISTERED
                                        ← Device NOT marked yet, SKIP!
    enable_device_and_get()
      xa_set_mark(DEVICE_REGISTERED)
          ← Too late, event was lost

The netdev event handler uses ib_enum_all_roce_netdevs() which only
iterates devices marked DEVICE_REGISTERED. However, this mark is set
late in the registration process, after the GID cache is already
populated. Events arriving in this window are silently dropped.

Fix this by introducing a new xarray mark DEVICE_GID_UPDATES that is
set immediately after the GID table is allocated and initialized. Use
the new mark in ib_enum_all_roce_netdevs() function to iterate devices
instead of DEVICE_REGISTERED.

This is safe because:
- After _gid_table_setup_one(), all required structures exist (port_data,
  immutable, cache.gid)
- The GID table mutex serializes concurrent access between the initial
  rescan and event handlers
- Event handlers correctly update stale GIDs even when racing with rescan
- The mark is cleared in ib_cache_cleanup_one() before teardown

This also fixes similar races for IP address events (inetaddr_event,
inet6addr_event) which use the same enumeration path.

Fixes: 0df91bb673 ("RDMA/devices: Use xarray to store the client_data")
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://patch.msgid.link/20260127093839.126291-1-jiri@resnulli.us
Reported-by: syzbot+881d65229ca4f9ae8c84@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=881d65229ca4f9ae8c84
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:20:49 -05:00
arch arm64: hugetlbpage: avoid unused-but-set-parameter warning (gcc-16) 2026-03-04 07:20:42 -05:00
block block: decouple secure erase size limit from discard size limit 2026-03-04 07:19:38 -05:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec 2026-01-30 10:32:12 +01:00
Documentation ipv6: Move ipv6_fl_list from ipv6_pinfo to inet_sock. 2026-03-04 07:20:44 -05:00
drivers RDMA/core: Fix stale RoCE GIDs during netdev events at registration 2026-03-04 07:20:49 -05:00
fs ksmbd: fix signededness bug in smb_direct_prepare_negotiation() 2026-03-04 07:20:46 -05:00
include Bluetooth: L2CAP: Fix result of L2CAP_ECRED_CONN_RSP when MTU is too short 2026-03-04 07:20:47 -05:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/timeout: annotate data race in io_flush_timeouts() 2026-03-04 07:19:36 -05:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel Remove WARN_ALL_UNSEEDED_RANDOM kernel config option 2026-03-04 07:20:46 -05:00
lib Remove WARN_ALL_UNSEEDED_RANDOM kernel config option 2026-03-04 07:20:46 -05:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/slab: fix false lockdep warning in __kfree_rcu_sheaf() 2026-02-26 14:59:14 -08:00
net tipc: fix duplicate publication key in tipc_service_insert_publ() 2026-03-04 07:20:48 -05:00
rust rust: cpufreq: always inline functions using build_assert with arguments 2026-03-04 07:19:37 -05:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts modpost: Amend ppc64 save/restfpr symnames for -Os build 2026-03-04 07:20:07 -05:00
security apparmor: fix aa_label to return state from compount and component match 2026-02-26 14:59:42 -08:00
sound ALSA: hda/hdmi: Add quirk for TUXEDO IBS14G6 2026-03-04 07:20:42 -05:00
tools rtla: Fix NULL pointer dereference in actions_parse 2026-03-04 07:20:13 -05:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: Don't clobber irqfd routing type when deassigning irqfd 2026-02-11 13:41:44 +01:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.15 2026-02-27 16:05:10 -05:00
README README: Fix spelling 2024-03-18 03:36:32 -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 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.