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Saravanan Vajravel 29ff057c0a IB/isert: Fix dead lock in ib_isert 
[ Upstream commit 691b048093 ]

- When a iSER session is released, ib_isert module is taking a mutex
  lock and releasing all pending connections. As part of this, ib_isert
  is destroying rdma cm_id. To destroy cm_id, rdma_cm module is sending
  CM events to CMA handler of ib_isert. This handler is taking same
  mutex lock. Hence it leads to deadlock between ib_isert & rdma_cm
  modules.

- For fix, created local list of pending connections and release the
  connection outside of mutex lock.

Calltrace:
---------
[ 1229.791410] INFO: task kworker/10:1:642 blocked for more than 120 seconds.
[ 1229.791416]       Tainted: G           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1
[ 1229.791418] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1229.791419] task:kworker/10:1    state:D stack:    0 pid:  642 ppid:     2 flags:0x80004000
[ 1229.791424] Workqueue: ib_cm cm_work_handler [ib_cm]
[ 1229.791436] Call Trace:
[ 1229.791438]  __schedule+0x2d1/0x830
[ 1229.791445]  ? select_idle_sibling+0x23/0x6f0
[ 1229.791449]  schedule+0x35/0xa0
[ 1229.791451]  schedule_preempt_disabled+0xa/0x10
[ 1229.791453]  __mutex_lock.isra.7+0x310/0x420
[ 1229.791456]  ? select_task_rq_fair+0x351/0x990
[ 1229.791459]  isert_cma_handler+0x224/0x330 [ib_isert]
[ 1229.791463]  ? ttwu_queue_wakelist+0x159/0x170
[ 1229.791466]  cma_cm_event_handler+0x25/0xd0 [rdma_cm]
[ 1229.791474]  cma_ib_handler+0xa7/0x2e0 [rdma_cm]
[ 1229.791478]  cm_process_work+0x22/0xf0 [ib_cm]
[ 1229.791483]  cm_work_handler+0xf4/0xf30 [ib_cm]
[ 1229.791487]  ? move_linked_works+0x6e/0xa0
[ 1229.791490]  process_one_work+0x1a7/0x360
[ 1229.791491]  ? create_worker+0x1a0/0x1a0
[ 1229.791493]  worker_thread+0x30/0x390
[ 1229.791494]  ? create_worker+0x1a0/0x1a0
[ 1229.791495]  kthread+0x10a/0x120
[ 1229.791497]  ? set_kthread_struct+0x40/0x40
[ 1229.791499]  ret_from_fork+0x1f/0x40

[ 1229.791739] INFO: task targetcli:28666 blocked for more than 120 seconds.
[ 1229.791740]       Tainted: G           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1
[ 1229.791741] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1229.791742] task:targetcli       state:D stack:    0 pid:28666 ppid:  5510 flags:0x00004080
[ 1229.791743] Call Trace:
[ 1229.791744]  __schedule+0x2d1/0x830
[ 1229.791746]  schedule+0x35/0xa0
[ 1229.791748]  schedule_preempt_disabled+0xa/0x10
[ 1229.791749]  __mutex_lock.isra.7+0x310/0x420
[ 1229.791751]  rdma_destroy_id+0x15/0x20 [rdma_cm]
[ 1229.791755]  isert_connect_release+0x115/0x130 [ib_isert]
[ 1229.791757]  isert_free_np+0x87/0x140 [ib_isert]
[ 1229.791761]  iscsit_del_np+0x74/0x120 [iscsi_target_mod]
[ 1229.791776]  lio_target_np_driver_store+0xe9/0x140 [iscsi_target_mod]
[ 1229.791784]  configfs_write_file+0xb2/0x110
[ 1229.791788]  vfs_write+0xa5/0x1a0
[ 1229.791792]  ksys_write+0x4f/0xb0
[ 1229.791794]  do_syscall_64+0x5b/0x1a0
[ 1229.791798]  entry_SYSCALL_64_after_hwframe+0x65/0xca

Fixes: bd3792205a ("iser-target: Fix pending connections handling in target stack shutdown sequnce")
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Saravanan Vajravel <saravanan.vajravel@broadcom.com>
Link: https://lore.kernel.org/r/20230606102531.162967-2-saravanan.vajravel@broadcom.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-06-21 15:59:17 +02:00
arch Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
block blk-iocost: avoid 64-bit division in ioc_timer_fn 2023-06-14 11:13:00 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-06-09 10:32:34 +02:00
Documentation Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
drivers IB/isert: Fix dead lock in ib_isert 2023-06-21 15:59:17 +02:00
fs nilfs2: fix possible out-of-bounds segment allocation in resize ioctl 2023-06-21 15:59:14 +02:00
include RDMA/cma: Always set static rate to 0 for RoCE 2023-06-21 15:59:17 +02:00
init kbuild: Add CONFIG_PAHOLE_VERSION 2023-02-25 12:06:45 +01:00
io_uring io_uring: hold uring mutex around poll removal 2023-06-21 15:59:14 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel kexec: support purgatories with .text.hot sections 2023-06-21 15:59:14 +02:00
lib test_firmware: fix a memory leak with reqs buffer 2023-06-21 15:59:12 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs 2023-05-11 23:00:18 +09:00
net net/sched: cls_u32: Fix reference counter leak leading to overflow 2023-06-21 15:59:16 +02:00
samples samples/bpf: Fix fout leak in hbm's run_bpf_prog 2023-05-24 17:36:45 +01:00
scripts gcc-plugins: Reorganize gimple includes for GCC 13 2023-06-14 11:12:59 +02:00
security selinux: don't use make's grouped targets feature yet 2023-06-09 10:32:32 +02:00
sound ALSA: hda/realtek: Add a quirk for Compaq N14JP6 2023-06-21 15:59:15 +02:00
tools tools: gpio: fix debounce_period_us output of lsgpio 2023-06-21 15:59:12 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: fix memoryleak in kvm_init() 2023-03-17 08:49:04 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Linux 5.15.117 2023-06-14 11:13:10 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 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.