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Chiara Meiohas 6d838873da RDMA/mlx5: Fix UMR hang in LAG error state unload 
[ Upstream commit ebc2164a4c ]

During firmware reset in LAG mode, a race condition causes the driver
to hang indefinitely while waiting for UMR completion during device
unload. See [1].

In LAG mode the bond device is only registered on the master, so it
never sees sys_error events from the slave.
During firmware reset this causes UMR waits to hang forever on unload
as the slave is dead but the master hasn't entered error state yet, so
UMR posts succeed but completions never arrive.

Fix this by adding a sys_error notifier that gets registered before
MLX5_IB_STAGE_IB_REG and stays alive until after ib_unregister_device().
This ensures error events reach the bond device throughout teardown.

[1]
Call Trace:
 __schedule+0x2bd/0x760
 schedule+0x37/0xa0
 schedule_preempt_disabled+0xa/0x10
 __mutex_lock.isra.6+0x2b5/0x4a0
 __mlx5_ib_dereg_mr+0x606/0x870 [mlx5_ib]
 ? __xa_erase+0x4a/0xa0
 ? _cond_resched+0x15/0x30
 ? wait_for_completion+0x31/0x100
 ib_dereg_mr_user+0x48/0xc0 [ib_core]
 ? rdmacg_uncharge_hierarchy+0xa0/0x100
 destroy_hw_idr_uobject+0x20/0x50 [ib_uverbs]
 uverbs_destroy_uobject+0x37/0x150 [ib_uverbs]
 __uverbs_cleanup_ufile+0xda/0x140 [ib_uverbs]
 uverbs_destroy_ufile_hw+0x3a/0xf0 [ib_uverbs]
 ib_uverbs_remove_one+0xc3/0x140 [ib_uverbs]
 remove_client_context+0x8b/0xd0 [ib_core]
 disable_device+0x8c/0x130 [ib_core]
 __ib_unregister_device+0x10d/0x180 [ib_core]
 ib_unregister_device+0x21/0x30 [ib_core]
 __mlx5_ib_remove+0x1e4/0x1f0 [mlx5_ib]
 auxiliary_bus_remove+0x1e/0x30
 device_release_driver_internal+0x103/0x1f0
 bus_remove_device+0xf7/0x170
 device_del+0x181/0x410
 mlx5_rescan_drivers_locked.part.10+0xa9/0x1d0 [mlx5_core]
 mlx5_disable_lag+0x253/0x260 [mlx5_core]
 mlx5_lag_disable_change+0x89/0xc0 [mlx5_core]
 mlx5_eswitch_disable+0x67/0xa0 [mlx5_core]
 mlx5_unload+0x15/0xd0 [mlx5_core]
 mlx5_unload_one+0x71/0xc0 [mlx5_core]
 mlx5_sync_reset_reload_work+0x83/0x100 [mlx5_core]
 process_one_work+0x1a7/0x360
 worker_thread+0x30/0x390
 ? create_worker+0x1a0/0x1a0
 kthread+0x116/0x130
 ? kthread_flush_work_fn+0x10/0x10
 ret_from_fork+0x22/0x40

Fixes: ede132a5cf ("RDMA/mlx5: Move events notifier registration to be after device registration")
Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Signed-off-by: Maher Sanalla <msanalla@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Edward Srouji <edwards@nvidia.com>
Link: https://patch.msgid.link/20260113-umr-hand-lag-fix-v1-1-3dc476e00cd9@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-26 14:59:25 -08:00
arch kallsyms/bpf: rename __bpf_address_lookup() to bpf_address_lookup() 2026-02-26 14:59:17 -08:00
block block,bfq: fix aux stat accumulation destination 2026-02-11 13:41:47 +01:00
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 dpll: add phase-adjust-gran pin attribute 2026-02-26 14:59:22 -08:00
drivers RDMA/mlx5: Fix UMR hang in LAG error state unload 2026-02-26 14:59:25 -08:00
fs smb: client: correct value for smbd_max_fragmented_recv_size 2026-02-26 14:59:22 -08:00
include dpll: add phase-adjust-gran pin attribute 2026-02-26 14:59:22 -08:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/kbuf: fix memory leak if io_buffer_add_list fails 2026-02-26 14:59:01 -08:00
ipc ipc: don't audit capability check in ipc_permissions() 2026-02-26 14:59:19 -08:00
kernel ucount: check for CAP_SYS_RESOURCE using ns_capable_noaudit() 2026-02-26 14:59:20 -08:00
lib lib/kstrtox: fix kstrtobool() docstring to mention enabled/disabled 2026-02-26 14:59:18 -08:00
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 af_unix: Fix memleak of newsk in unix_stream_connect(). 2026-02-26 14:59:23 -08:00
rust rust: task: restrict Task::group_leader() to current 2026-02-26 14:59:18 -08:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:17:11 +01:00
scripts scripts: generate_rust_analyzer: Add compiler_builtins -> core dep 2026-02-06 16:57:42 +01:00
security evm: Use ordered xattrs list to calculate HMAC in evm_init_hmac() 2026-02-26 14:59:14 -08:00
sound ASoC: SDCA: Handle volatile controls correctly 2026-02-26 14:59:15 -08:00
tools tools/power/x86/intel-speed-select: Fix file descriptor leak in isolate_cpus() 2026-02-26 14:59:25 -08:00
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 6.18.13 2026-02-19 16:31:37 +01:00
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.