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Daisuke Matsuda 10af303192 RDMA/rxe: Fix spinlock recursion deadlock on requester 
The following deadlock is observed:

 Call Trace:
  <IRQ>
  _raw_spin_lock_bh+0x29/0x30
  check_type_state.constprop.0+0x4e/0xc0 [rdma_rxe]
  rxe_rcv+0x173/0x3d0 [rdma_rxe]
  rxe_udp_encap_recv+0x69/0xd0 [rdma_rxe]
  ? __pfx_rxe_udp_encap_recv+0x10/0x10 [rdma_rxe]
  udp_queue_rcv_one_skb+0x258/0x520
  udp_unicast_rcv_skb+0x75/0x90
  __udp4_lib_rcv+0x364/0x5c0
  ip_protocol_deliver_rcu+0xa7/0x160
  ip_local_deliver_finish+0x73/0xa0
  ip_sublist_rcv_finish+0x80/0x90
  ip_sublist_rcv+0x191/0x220
  ip_list_rcv+0x132/0x160
  __netif_receive_skb_list_core+0x297/0x2c0
  netif_receive_skb_list_internal+0x1c5/0x300
  napi_complete_done+0x6f/0x1b0
  virtnet_poll+0x1f4/0x2d0 [virtio_net]
  __napi_poll+0x2c/0x1b0
  net_rx_action+0x293/0x350
  ? __napi_schedule+0x79/0x90
  __do_softirq+0xcb/0x2ab
  __irq_exit_rcu+0xb9/0xf0
  common_interrupt+0x80/0xa0
  </IRQ>
  <TASK>
  asm_common_interrupt+0x22/0x40
  RIP: 0010:_raw_spin_lock+0x17/0x30
  rxe_requester+0xe4/0x8f0 [rdma_rxe]
  ? xas_load+0x9/0xa0
  ? xa_load+0x70/0xb0
  do_task+0x64/0x1f0 [rdma_rxe]
  rxe_post_send+0x54/0x110 [rdma_rxe]
  ib_uverbs_post_send+0x5f8/0x680 [ib_uverbs]
  ? netif_receive_skb_list_internal+0x1e3/0x300
  ib_uverbs_write+0x3c8/0x500 [ib_uverbs]
  vfs_write+0xc5/0x3b0
  ksys_write+0xab/0xe0
  ? syscall_trace_enter.constprop.0+0x126/0x1a0
  do_syscall_64+0x3b/0x90
  entry_SYSCALL_64_after_hwframe+0x72/0xdc
  </TASK>

The deadlock is easily reproducible with perftest. Fix it by disabling
softirq when acquiring the lock in process context.

Fixes: f605f26ea1 ("RDMA/rxe: Protect QP state with qp->state_lock")
Link: https://lore.kernel.org/r/20230418090642.1849358-1-matsuda-daisuke@fujitsu.com
Signed-off-by: Daisuke Matsuda <matsuda-daisuke@fujitsu.com>
Acked-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
 		2023-04-21 12:33:00 -03:00
Documentation Including fixes from netfilter, wifi and ipsec. 2023-03-17 13:31:16 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
arch - Flush out logged errors immediately after MCA banks configuration 2023-03-19 09:57:53 -07:00
block block: remove obsolete config BLOCK_COMPAT 2023-03-16 09:35:44 -06:00
certs Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
crypto Networking changes for 6.3. 2023-02-21 18:24:12 -08:00
drivers RDMA/rxe: Fix spinlock recursion deadlock on requester 2023-04-21 12:33:00 -03:00
fs Fix a double unlock bug on an error path in ext4, found by smatch and 2023-03-19 09:38:26 -07:00
include RDMA/mlx5: Fix flow counter query via DEVX 2023-04-18 08:47:10 +03:00
init Kbuild updates for v6.3 2023-02-26 11:53:25 -08:00
io_uring io_uring/rsrc: fix folio accounting 2023-03-16 09:32:18 -06:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel Tracing fixes for 6.3: 2023-03-19 10:46:02 -07:00
lib Zstd fixes for v6.3 2023-03-14 17:03:25 -07:00
mm mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or_deactivate() 2023-03-07 17:04:55 -08:00
net Including fixes from netfilter, wifi and ipsec. 2023-03-17 13:31:16 -07:00
rust Rust fixes for 6.3-rc1 2023-03-03 14:51:15 -08:00
samples LoongArch changes for v6.3 2023-03-01 09:27:00 -08:00
scripts kbuild: use git-archive for source package creation 2023-03-16 22:46:12 +09:00
security capability: just use a 'u64' instead of a 'u32[2]' array 2023-03-01 10:01:22 -08:00
sound ALSA: hda/ca0132: fixup buffer overrun at tuning_ctl_set() 2023-03-14 17:04:53 +01:00
tools Including fixes from netfilter, wifi and ipsec. 2023-03-17 13:31:16 -07:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt KVM/riscv changes for 6.3 2023-02-15 12:33:28 -05:00
.clang-format cpumask: re-introduce constant-sized cpumask optimizations 2023-03-05 14:30:34 -08:00
.cocciconfig
…
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore kbuild: rpm-pkg: move source components to rpmbuild/SOURCES 2023-03-16 22:45:56 +09:00
.mailmap Including fixes from netfilter, wifi and ipsec. 2023-03-17 13:31:16 -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 There is no particular theme here - mainly quick hits all over the tree. 2023-02-23 17:55:40 -08:00
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 fbdev updates for kernel 6.3-rc3: 2023-03-18 16:01:34 -07:00
Makefile Linux 6.3-rc3 2023-03-19 13:27:55 -07:00
README
…

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 Restructured Text 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.