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Zhu Yanjun 86dfdd8288 RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency In the commit `aee2424246` ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs"), the function flush_workqueue is invoked to flush the work queue iwcm_wq. But at that time, the work queue iwcm_wq was created via the function alloc_ordered_workqueue without the flag WQ_MEM_RECLAIM. Because the current process is trying to flush the whole iwcm_wq, if iwcm_wq doesn't have the flag WQ_MEM_RECLAIM, verify that the current process is not reclaiming memory or running on a workqueue which doesn't have the flag WQ_MEM_RECLAIM as that can break forward-progress guarantee leading to a deadlock. The call trace is as below: [ 125.350876][ T1430] Call Trace: [ 125.356281][ T1430] <TASK> [ 125.361285][ T1430] ? __warn (kernel/panic.c:693) [ 125.367640][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.375689][ T1430] ? report_bug (lib/bug.c:180 lib/bug.c:219) [ 125.382505][ T1430] ? handle_bug (arch/x86/kernel/traps.c:239) [ 125.388987][ T1430] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 125.395831][ T1430] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) [ 125.403125][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.410984][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.418764][ T1430] __flush_workqueue (kernel/workqueue.c:3970) [ 125.426021][ T1430] ? __pfx___might_resched (kernel/sched/core.c:10151) [ 125.433431][ T1430] ? destroy_cm_id (drivers/infiniband/core/iwcm.c:375) iw_cm [ 125.441209][ T1430] ? __pfx___flush_workqueue (kernel/workqueue.c:3910) [ 125.473900][ T1430] ? _raw_spin_lock_irqsave (arch/x86/include/asm/atomic.h:107 include/linux/atomic/atomic-arch-fallback.h:2170 include/linux/atomic/atomic-instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 125.473909][ T1430] ? __pfx__raw_spin_lock_irqsave (kernel/locking/spinlock.c:161) [ 125.482537][ T1430] _destroy_id (drivers/infiniband/core/cma.c:2044) rdma_cm [ 125.495072][ T1430] nvme_rdma_free_queue (drivers/nvme/host/rdma.c:656 drivers/nvme/host/rdma.c:650) nvme_rdma [ 125.505827][ T1430] nvme_rdma_reset_ctrl_work (drivers/nvme/host/rdma.c:2180) nvme_rdma [ 125.505831][ T1430] process_one_work (kernel/workqueue.c:3231) [ 125.515122][ T1430] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3393) [ 125.515127][ T1430] ? __pfx_worker_thread (kernel/workqueue.c:3339) [ 125.531837][ T1430] kthread (kernel/kthread.c:389) [ 125.539864][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.550628][ T1430] ret_from_fork (arch/x86/kernel/process.c:147) [ 125.558840][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.558844][ T1430] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) [ 125.566487][ T1430] </TASK> [ 125.566488][ T1430] ---[ end trace 0000000000000000 ]--- Fixes: `aee2424246` ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs") Link: https://patch.msgid.link/r/20240820113336.19860-1-yanjun.zhu@linux.dev Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202408151633.fc01893c-oliver.sang@intel.com Tested-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>		History 2024-08-23 11:44:43 -03:00
arch	X86 fixes:	2024-08-04 08:57:08 -07:00
block	block: fix deadlock between sd_remove & sd_release	2024-07-24 09:51:21 -06:00
certs	kbuild: use $(src) instead of $(srctree)/$(src) for source directory	2024-05-10 04:34:52 +09:00
crypto	crypto: testmgr - generate power-of-2 lengths more often	2024-07-13 11:50:28 +12:00
Documentation	profiling: remove profile=sleep support	2024-08-04 13:36:28 -07:00
drivers	RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency	2024-08-23 11:44:43 -03:00
fs	'smb3 client fixes	2024-08-04 08:18:40 -07:00
include	RDMA/mlx5: Introduce GET_DATA_DIRECT_SYSFS_PATH ioctl	2024-08-11 11:12:50 +03:00
init	rust: SHADOW_CALL_STACK is incompatible with Rust	2024-08-01 16:15:03 +01:00
io_uring	io_uring: remove unused local list heads in NAPI functions	2024-07-30 06:20:20 -06:00
ipc	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
kernel	profiling: remove profile=sleep support	2024-08-04 13:36:28 -07:00
lib	minmax: don't use max() in situations that want a C constant expression	2024-07-28 20:23:27 -07:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	minmax: make generic MIN() and MAX() macros available everywhere	2024-07-28 15:49:18 -07:00
net	Including fixes from wireless, bleutooth, BPF and netfilter.	2024-08-01 09:42:09 -07:00
rust	Rust changes for v6.11	2024-07-27 13:44:54 -07:00
samples	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00
scripts	syscalls: fix syscall macros for newfstat/newfstatat	2024-08-02 15:20:47 +02:00
security	apparmor-pr-2024-07-24 PR 2024-07-25	2024-07-27 13:28:39 -07:00
sound	sound fixes for 6.11-rc2	2024-08-02 09:04:57 -07:00
tools	* fix latent bug in how usage of large pages is determined for	2024-08-02 10:17:49 -07:00
usr	initramfs: shorten cmd_initfs in usr/Makefile	2024-07-16 01:07:52 +09:00
virt	KVM: guest_memfd: abstract how prepared folios are recorded	2024-07-26 14:46:15 -04:00
.clang-format	Docs: Move clang-format from process/ to dev-tools/	2024-06-26 16:36:00 -06:00
.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	Add Jeff Kirsher to .get_maintainer.ignore	2024-03-08 11:36:54 +00:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: add script and target to generate pacman package	2024-07-22 01:24:22 +09:00
.mailmap	MAINTAINERS: mailmap: update James Clark's email address	2024-07-26 14:32:35 -07:00
.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	tracing: Update of MAINTAINERS and CREDITS file	2024-07-18 14:08:42 -07:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Including fixes from wireless, bleutooth, BPF and netfilter.	2024-08-01 09:42:09 -07:00
Makefile	Linux 6.11-rc2	2024-08-04 13:50:53 -07:00
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.